An automatic clog cleaning and recovery system for a powder filter

Abstract

The present invention relates to an automatic blockage clearing and recovery system for a powder filter, which includes a first powder filter and a connecting pipe. The first powder filter is connected to a storage tank and a secondary vibrating screen through the connecting pipe, a feed pipe and an air pipe. A rotary valve is provided between the storage tank and the secondary vibrating screen. The outlet of the first powder filter is connected to a finished product silo through the connecting pipe. A third pneumatic valve is provided between the finished product silo and the first powder filter. A first pneumatic valve is provided on the feed pipe between the feed inlet and the first powder filter, and a second pneumatic valve is provided between the feed pipe and the air pipe. A device inert tail gas outlet is connected through a connecting pipe between the third pneumatic valve and the first powder filter, and a fourth pneumatic valve is provided on this connecting pipe. This system has simple operation, high efficiency, reduces costs, and improves economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of cleaning of powder filters, and particularly to an automatic blockage removal and recovery system for a powder filter. Background Art

[0002] When producing purified terephthalic acid, the inner walls of equipment such as rotary filters and dryers will form wall deposits after long-term operation. During the production process, the wall deposit materials are likely to fall off and mix into the product, affecting the product quality. Therefore, before the product enters the silo, it must pass through a powder filter for screening to separate lumpy or large-particle materials. As the operation time of the device extends, the quantity of separated large-particle materials increases, and the powder filter frequently gets blocked. It is necessary to switch the filter in time and conduct manual cleaning on it. The manual cleaning method uses manual material extraction. The disassembly of the filter is rather troublesome, with a large workload, and there is a significant risk that the dryer system will trip due to untimely switching of the blocked filter. Most of the materials manually taken out are qualified products, but due to the presence of lumps or larger particles and secondary pollution during the manual material extraction process, they can only be sold as waste materials. Taking a 2-million-ton purified terephthalic acid device as an example, nearly 100 tons of such waste materials are generated every year. The selling price of the waste materials is 2,000 - 3,000 yuan per ton lower than that of the superior products, resulting in an economic loss of 200,000 - 300,000 yuan per year. In view of the above problems, the present invention makes innovative improvements. Summary of the Invention

[0003] To overcome the above-mentioned defects of the prior art, the present invention provides an automatic blockage removal and recovery system for a powder filter, which is simple to operate, has high efficiency, reduces costs, and improves economic benefits.

[0004] The specific implementation scheme of the present invention is as follows:

[0005] The present application provides an automatic blockage removal and recovery system for a powder filter, including a first powder filter and a connecting pipe. It is characterized in that the inlet of the first powder filter is connected to a feed pipe with a feed port, and the outlet is connected to a finished product silo through the connecting pipe. A third pneumatic valve is provided between the finished product silo and the first powder filter. The feed pipe is connected to the inlet of the first powder filter and is also connected to an air pipe. The air pipe is connected to a storage tank. The outlet of the storage tank is connected to a secondary vibrating screen through a connecting pipe. A rotary valve is provided between the secondary vibrating screen and the storage tank. A first pneumatic valve is provided between the feed port and the first powder filter of the feed pipe, and a second pneumatic valve is provided between the feed pipe and the air pipe. A device inert tail gas outlet is connected to the first powder filter through a connecting pipe between the third pneumatic valve and the first powder filter, and a fourth pneumatic valve is provided on this connecting pipe.

[0006] Preferably, a tee is provided on the feed pipe and is communicated with the feed port. One end of the tee is connected to a second powder filter, and the other end is provided with a branch pipe communicated with the air pipe. The outlet of the second powder filter is connected to the finished product bin through a connecting pipe, and a fifth pneumatic valve is arranged between the outlet and the finished product bin. The fifth pneumatic valve and the second powder filter are connected to the inert tail gas outlet of the device through a connecting pipe, and a sixth pneumatic valve is arranged between the connecting pipe and the inert tail gas outlet of the device. A seventh pneumatic valve is arranged between the second powder filter and the feed port. An eighth pneumatic valve and a ninth pneumatic valve are respectively arranged at one end of the branch pipe close to the tee and at one end close to the air pipe.

[0007] Preferably, a position sensor is arranged in the storage tank, and the position sensor is connected with an alarm.

[0008] Preferably, a bag filter is arranged on the top of the storage tank, and an exhaust port is arranged on the bag filter.

[0009] Preferably, first pressure gauges are respectively arranged on the tee and the feed pipe of the first powder filter and the second powder filter close to their inlets, and second pressure gauges are respectively arranged on the connecting pipes close to their outlets. Pressure alarms are respectively connected between the first pressure gauges and the second pressure gauges.

[0010] Preferably, the secondary vibrating screen includes a first powder screen. A second powder screen is arranged at the bottom of the first powder screen, and a third powder screen is arranged at the bottom of the second powder screen. Powder outlets are arranged on the first powder screen, the second powder screen and the third powder screen.

[0011] Beneficial effects:

[0012] This system not only realizes the automatic blockage clearing of the powder filter during the continuous production process of large chemical plants, avoids the high intensity and secondary powder pollution during manual cleaning, but also screens the cleared powder, greatly reducing the waste quantity and improving the economic benefits.

[0013] The beneficial effects of the present invention will be elaborated in detail in the embodiments, making the beneficial effects more obvious. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the system structure in the specific embodiment of the present invention.

[0015] Wherein:

[0016] 0. Feed inlet; 1. First powder filter; 2. Second powder filter; 3. Finished product silo; 4. Inert tail gas of the device; 5. Storage tank; 6. Rotary valve; 7. Secondary vibrating screen; 8. Bag filter; 9. Exhaust port; 10. Position sensor; 11. Alarm; 12. First pressure gauge; 13. Second pressure gauge; 14. Pressure alarm; 20. Connecting pipe; 21. Feed pipe; 22. Air pipe; 23. Three-way pipe; 24. Branch pipe; 71. First powder sieve; 72. Second powder sieve; 73. Third powder sieve; 101. First pneumatic valve; 102. Second pneumatic valve; 103. Third pneumatic valve; 104. Fourth pneumatic valve; 105. Fifth pneumatic valve; 106. Sixth pneumatic valve; 107. Seventh pneumatic valve; 108. Eighth pneumatic valve; 109. Ninth pneumatic valve. Detailed implementation manners

[0017] The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0018] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0019] The embodiments of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0020] Embodiment 1

[0021] As Figure 1As shown in the figure, an automatic clogging removal and recovery system for a powder filter includes a first powder filter 1 and a connecting pipe 20. In a specific embodiment of the present invention, the inlet of the first powder filter 1 is connected to a feed pipe 21 with a feed port 0, and the outlet is connected to a finished product bin 3 through the connecting pipe 20. A third pneumatic valve 103 is provided on the connecting pipe 20 between the finished product bin 3 and the first powder filter 1. When the powder enters the first powder filter 1 from the feed port 0, the third pneumatic valve 103 is opened so that the filtered finished product enters the finished product bin 3. The feed pipe 21 is connected to the inlet of the first powder filter 1 and is also connected to an air pipe 22. The air pipe 22 is connected to a storage tank 5. The outlet of the storage tank 5 is connected to a secondary vibrating screen 7 through the connecting pipe 20. A first pneumatic valve 101 is provided between the feed port 0 and the inlet of the first powder filter 1 of the feed pipe 21, and a second pneumatic valve 102 is provided between the feed pipe 21 and the air pipe 22. The outlet of the third pneumatic valve 103 and the first powder filter 1 are connected to the outlet of the device inert tail gas 4 through the connecting pipe 20, and a fourth pneumatic valve 104 is provided on this connecting pipe 20. The device inert tail gas 4 is provided by other devices that can generate inert gas, such as an inert gas generating device, etc. The device inert tail gas 4 discharged from the device is utilized to save resources. The inert gas is also relatively stable and not prone to chemical reactions, making it safe to use. When a certain amount of agglomerated or large-particle powder is filtered out in the first powder filter 1, the first pneumatic valve 101 and the third pneumatic valve 103 are closed, the second pneumatic valve 102 and the fourth pneumatic valve 104 are opened, and the device inert tail gas 4 is introduced. The device inert tail gas 4 enters the first powder filter 1 along the connecting pipe 20, blows out the large particles inside from the inlet of the first powder filter 1, blows them into the feed pipe 21, and then enters the air pipe 22 along with the device inert tail gas 4, and thus enters the storage tank 5. Then, a rotary valve 6 is provided between the secondary vibrating screen 7 and the storage tank 5. Since the fluidity of the powder is relatively poor, the rotary valve 6 can increase the fluidity, making its flow rate into the secondary vibrating screen 7 faster and improving the efficiency. A position sensor 10 is provided in the storage tank 5 to sense the height of the powder in the storage tank 5. The position sensor 10 is connected to an alarm 11. When the powder height is lower or higher than the set upper or lower limit value, the alarm 11 emits an alarm to remind the staff to add powder or convey powder to the secondary vibrating screen. A bag filter 8 is provided on the top of the storage tank 5. The bag filter 8 is provided with an exhaust port 9 to allow the gas to be discharged outward, and the dust remains in the bag to avoid dust emission and protect the environment.

[0022] The secondary vibrating screen includes a first powder sieve 71. A second powder sieve 72 is provided at the bottom of the first powder sieve 71, and a third powder sieve 73 is provided at the bottom of the second powder sieve 72. Powder outlets are provided on the first powder sieve 71, the second powder sieve 72, and the third powder sieve 73. The first powder sieve 71 screens out large particles or lumps with a diameter greater than 500 μm, the second powder sieve 72 screens out small particle powders with a diameter between 250 - 500 μm, and the third powder sieve 73 screens out fine powders with a diameter less than 250 μm. After the powder flows into the secondary vibrating screen 7, the screened large particles / lumps, small particles, and fine powders are respectively collected for packaging. The fine powders are equivalent to normal products and can be sold mixed; the small particle materials can be used as graded products for general chemical resin production; the remaining large particles or lumps are sold cheaply as waste materials. The quantity of waste materials is greatly reduced, which significantly reduces the waste volume and improves economic efficiency. This system avoids the large workload of disassembling the filter and removing materials during manual cleaning, makes full use of the powder, saves costs, improves economic efficiency, and improves work efficiency.

[0023] Example 2

[0024] The difference from the above embodiment is that, as Figure 1As shown, preferably, a tee 23 communicating with the feed inlet 0 is provided on the feed pipe 21. One end of the tee 23 is connected to the second powder filter 2, and a branch pipe 24 communicating with the air pipe 22 is provided at the other end. The outlet of the second powder filter 2 is connected to the finished product bin 3 through a connecting pipe 20, and a fifth pneumatic valve 105 is provided between the outlet of the second powder filter 2 and the finished product bin 3. A seventh pneumatic valve 107 is provided between the second powder filter 2 and the feed inlet 0. An eighth pneumatic valve 108 and a ninth pneumatic valve 109 are respectively provided at one end of the branch pipe 24 close to the tee 23 and at one end close to the air pipe 22. When the first powder filter 1 is being cleaned, the second powder filter 2 can be enabled, the eighth pneumatic valve 108 is closed, the seventh pneumatic valve 107 and the fifth pneumatic valve 105 are opened, and the powder enters from the feed inlet 0, passes through the seventh pneumatic valve 107, enters the second powder filter 2 for filtration, and then enters the finished product bin 3. A connecting pipe 20 between the fifth pneumatic valve 105 and the second powder filter 2 is connected to the outlet of the inert tail gas 4 of the device, and a sixth pneumatic valve 106 is provided between the connecting pipe 20 and the outlet of the inert tail gas 4 of the device. When the second powder filter 2 is being cleaned, the first powder filter 1 filters. At this time, the second pneumatic valve 102, the fifth pneumatic valve 105, and the seventh pneumatic valve 107 are closed, and the sixth pneumatic valve 106, the eighth pneumatic valve 108, and the ninth pneumatic valve 109 are opened, and the inert tail gas 4 of the device is introduced to blow the large particles and lumps of the second powder filter 2 towards the inlet, and then through the branch pipe 24 and the air pipe 22 into the storage tank 5 for filtration and separation by the secondary vibrating screen 7. The filtration and separation steps of the secondary vibrating screen 7 are the same as those in Embodiment 1 and will not be elaborated here. This design can ensure that the filtration operation of one of the first powder filter 1 and the second powder filter 2 is not affected during the cleaning of the other, saving production time and improving work efficiency.

[0025] Embodiment 3

[0026] The difference from the above embodiment is that, as Figure 1 shown, first pressure gauges 12 are respectively provided on the tee 23 and the feed pipe 21 of the first powder filter 1 and the second powder filter 2 close to their inlets, and second pressure gauges 13 are respectively provided on the connecting pipes 20 close to their outlets. Pressure alarms 14 are respectively connected between the first pressure gauges 12 and the second pressure gauges 13. When the pressure difference before and after the powder filter reaches a specified value (the specified value is set by the manufacturer according to the specifications of the filter), blocking starts after the pressure difference reaches the specified value, and the pressure alarm 14 starts to sound, reminding the staff to stop the filtration production, and then introduce the inert tail gas 4 of the device for cleaning. This prevents excessive large particles or large lumps of powder from affecting the filtration effect.

[0027] The first to ninth pneumatic valves, the rotary valve 6, the first pressure gauge 12, the second pressure gauge 13, the pressure alarm 14, the position sensor 10, and the alarm 11 are all controlled and operated through the central control room, enabling remote operation and automatic material cleaning, avoiding the large workload of disassembling the filter and removing the material during manual cleaning.

[0028] Working principle:

[0029] 1. When cleaning the first powder filter 1, close the first pneumatic valve 101, the third pneumatic valve 103, and the ninth pneumatic valve 109, open the fourth pneumatic valve 104 and the second pneumatic valve 102, introduce the inert tail gas 4 of the device, blow out the large particles or large pieces of powder from the first powder filter 1, and flow into the storage tank 5 through the feed pipe 21 and the gas pipe 22; When the second powder filter 2 is in production: close the first pneumatic valve 101, the eighth pneumatic valve 108, and the sixth pneumatic valve 106, open the seventh pneumatic valve 107 and the fifth pneumatic valve 105. When the powder enters from the feed port 0 and is filtered by the second powder filter 2, it enters the finished product bin 3.

[0030] 2. When cleaning the second powder filter 2: close the fifth pneumatic valve 105, the second pneumatic valve 102, and the seventh pneumatic valve 107, open the sixth pneumatic valve 106, the eighth pneumatic valve 108, and the ninth pneumatic valve 109, introduce the inert tail gas 4 of the device, blow out the large particles or large pieces of powder from the second powder filter 2, and flow into the storage tank 5 through the tee pipe 23, the branch pipe 24, and the gas pipe 22; When the first powder filter 1 is in production: close the second pneumatic valve 102, the seventh pneumatic valve 107, and the fourth pneumatic valve 104, open the first pneumatic valve 101 and the third pneumatic valve 103. The powder enters from the feed port 0, is filtered in the first powder filter 1, and then flows into the finished product bin 3.

[0031] It should be noted that in this text, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article, or device. Without further limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described method may be performed in a different order than described, and various steps may also be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0032] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. An automatic blockage clearing and recovery system for a powder filter, comprising a first powder filter and a connecting pipe, characterized in that, The inlet of the first powder filter is connected to a feed pipe with a feed inlet, and the outlet is connected to a finished product bin through a connecting pipe. A third pneumatic valve is provided between the finished product bin and the first powder filter. The feed pipe is connected to the inlet of the first powder filter and is also connected to an air pipe. The air pipe is connected to a storage tank. The outlet of the storage tank is connected to a secondary vibrating screen through a connecting pipe. A rotary valve is provided between the secondary vibrating screen and the storage tank. A first pneumatic valve is provided on the feed pipe between the feed inlet and the first powder filter, and a second pneumatic valve is provided between the feed pipe and the air pipe. A device inert tail gas outlet is connected to the connecting pipe between the third pneumatic valve and the first powder filter, and a fourth pneumatic valve is provided on this connecting pipe.

2. The automatic blockage clearing and recovery system for a powder filter according to claim 1, characterized in that, A tee pipe communicating with the feed inlet is provided on the feed pipe. One end of the tee pipe is connected to a second powder filter, and the other end is provided with a branch pipe communicating with the air pipe. The outlet of the second powder filter is connected to the finished product bin through a connecting pipe, and a fifth pneumatic valve is provided between the second powder filter and the finished product bin. The connecting pipe between the fifth pneumatic valve and the second powder filter is connected to the device inert tail gas outlet, and a sixth pneumatic valve is provided between the connecting pipe and the device inert tail gas outlet. A seventh pneumatic valve is provided between the second powder filter and the feed inlet. An eighth pneumatic valve and a ninth pneumatic valve are respectively provided on the branch pipe near one end of the tee pipe and near one end of the air pipe.

3. The automatic blockage clearing and recovery system for a powder filter according to claim 1 or 2, characterized in that, A position sensor is provided in the storage tank, and the position sensor is connected to an alarm.

4. The automatic blockage clearing and recovery system for a powder filter according to claim 3, characterized in that, A bag filter is provided on the top of the storage tank, and an exhaust port is provided on the bag filter.

5. The automatic blockage clearing and recovery system for a powder filter according to claim 2, characterized in that, First pressure gauges are respectively provided on the tee pipe and the feed pipe near the inlets of the first powder filter and the second powder filter, and second pressure gauges are respectively provided on the connecting pipes near their outlets. Pressure alarms are respectively connected between the first pressure gauges and the second pressure gauges.

6. The automatic blockage clearing and recovery system for a powder filter according to claim 1 or 4 or 5, characterized in that, The secondary vibrating screen includes a first powder screen. A second powder screen is provided at the bottom of the first powder screen, and a third powder screen is provided at the bottom of the second powder screen. Powder outlets are provided on the first powder screen, the second powder screen, and the third powder screen.

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