Flue gas dust removal device and converter flue gas dust removal system

Abstract

This invention proposes a flue gas dust removal device and a converter flue gas dust removal system. The flue gas dust removal device includes a first dust removal pipe and a second dust removal pipe arranged in parallel. The first and second dust removal pipes form a flue gas inlet and a flue gas outlet, respectively. A bag filter is installed on the first dust removal pipe, and a sintered plate dust collector is installed on the second dust removal pipe. When the second dust removal pipe is open and the first dust removal pipe is closed, the sintered plate dust collector replaces the bag filter for flue gas dust removal to prevent condensation of flue gas inside the bag filter. This invention solves the problem that existing bag filters are prone to clogging under special operating conditions, leading to a decrease in dust removal efficiency.

Description

Technical Field

[0001] This utility model relates to the field of flue gas purification technology, and in particular to a flue gas dust removal device and a converter flue gas dust removal system. Background Technology

[0002] Converter primary flue gas treatment methods can be divided into dry dust removal and wet dust removal, both of which are widely used in current smelting processes. Both dry and wet dust removal methods have various technological routes based on different mechanisms. Due to current stringent environmental protection requirements and the need for energy conservation and efficiency improvements, wet dust removal is gradually being phased out, while dry dust removal is becoming increasingly prevalent in the field of flue gas dust removal.

[0003] For dry dust removal, the mainstream technology is dry electrostatic precipitator (ESP), with the electrostatic precipitator as its core equipment. It uses an electric field to adsorb charged dust particles, achieving fine dust removal. As a composite dust removal device (relying on mechanical stability and the stability and coordination of the high-voltage power supply), the ESP's dust removal efficiency is affected by many variables; therefore, "instability" is a major characteristic of ESPs. Based on the two requirements of "high-efficiency dust removal" and "stability," the characteristics of bag filters are utilized to replace ESPs, achieving highly efficient and stable dust removal and meeting ultra-low emission requirements.

[0004] Filter bags have excellent filtration properties, but they also have disadvantages. Filter media are prone to sticking and clogging when exposed to high humidity flue gas or under certain extreme working conditions and scenarios, leading to a decrease in dust removal performance and increased maintenance work. Utility Model Content

[0005] The purpose of this invention is to provide a flue gas dust removal device and a converter flue gas dust removal system to solve the problem that existing bag filter dust removal devices are prone to clogging under special working conditions, resulting in a decrease in dust removal efficiency.

[0006] The above-mentioned technical objectives of this utility model are mainly achieved through the following technical solutions.

[0007] On one hand, this utility model provides a flue gas dust removal device, which includes a first dust removal pipe and a second dust removal pipe arranged in parallel. The two ends of the first dust removal pipe and the second dust removal pipe respectively form a flue gas inlet and a flue gas outlet. A bag filter is provided on the first dust removal pipe, and a sintered plate dust collector is provided on the second dust removal pipe. When the second dust removal pipe is open and the first dust removal pipe is closed, the sintered plate dust collector replaces the bag filter for flue gas dust removal to avoid condensation of flue gas in the bag filter.

[0008] In a preferred embodiment of the present invention, the first dust removal pipe is provided with a first switching valve group for controlling its on / off state, and the second dust removal pipe is provided with a second switching valve group for controlling its on / off state.

[0009] In a preferred embodiment of the present invention, the first switching valve group includes a first switching valve and a second switching valve, the first switching valve and the second switching valve being located on the pipe connected to the inlet end and the pipe connected to the outlet end of the bag filter, respectively.

[0010] In a preferred embodiment of the present invention, the second switching valve group includes a third switching valve and a fourth switching valve, both of which are located on the pipe connected to the inlet end of the sintered plate dust collector.

[0011] In a preferred embodiment of the present invention, the first dust removal pipe is provided with a plurality of bag filters, which are arranged in parallel or in series.

[0012] In a preferred embodiment of the present invention, a plurality of bag filters are provided on the first dust removal pipe, and the plurality of bag filters are arranged in parallel.

[0013] In a preferred embodiment of the present invention, the first dust removal pipeline has a flue gas inlet pipe and a flue gas outlet pipe, the inlet of each bag filter is connected to the flue gas inlet pipe through an inlet connecting pipe, and the outlet of each bag filter is connected to the flue gas outlet pipe through an outlet connecting pipe.

[0014] In a preferred embodiment of the present invention, the first switching valve is disposed on the flue gas inlet pipe, and the second switching valve is disposed on the flue gas outlet pipe.

[0015] On the other hand, this utility model also provides a converter flue gas dust removal system, which includes:

[0016] Converter;

[0017] The flue connected to the converter is equipped with a dust removal section, which uses the flue gas dust removal device described above.

[0018] In a preferred embodiment of the present invention, the flue includes a raw coal gas pipeline connected to the flue gas inlet and a clean coal gas pipeline connected to the flue gas outlet.

[0019] Compared with the prior art, the technical solution of this utility model has the following features and advantages:

[0020] The flue gas dust removal device and converter flue gas dust removal system described in this utility model connect a sintered plate dust collector in parallel with an existing bag filter. Under extreme operating conditions, the system switches to the sintered plate dust collector to remove dust from the flue gas. This solves the problems of condensation on bags in extremely cold regions, condensation caused by high humidity air during the plum rain season, and condensation on flue gas after a long shutdown. It also avoids bag blockage in the bag filter, reduces the workload of bag filter maintenance, and maximizes the dust removal performance of the bag filter. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0023] Figure 1 This is a schematic diagram of the flue gas dust removal device described in this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Flue gas inlet; 200. Flue gas outlet;

[0026] 10. First dust collection duct; 11. Bag filter; 12. First switching valve; 13. Second switching valve; 14. Flue gas inlet pipe; 15. Flue gas outlet pipe; 16. Inlet connecting pipe; 17. Outlet connecting pipe;

[0027] 20. Second dust removal duct; 21. Sintered plastic plate dust collector; 22. Third switching valve; 23. Fourth switching valve. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Implementation Method 1:

[0032] This utility model provides a flue gas dust removal device, such as Figure 1 As shown, it includes a first dust removal pipe 10 and a second dust removal pipe 20 arranged in parallel. The two ends of the first dust removal pipe 10 and the second dust removal pipe 20 respectively form a flue gas inlet 100 and a flue gas outlet 200. A bag filter 11 is provided on the first dust removal pipe 10, and a sintered plate dust collector 21 is provided on the second dust removal pipe 20. When the second dust removal pipe 20 is open and the first dust removal pipe 10 is closed, the sintered plate dust collector 21 replaces the bag filter 11 for flue gas dust removal to avoid condensation of flue gas inside the bag filter 11.

[0033] The flue gas dust removal device of this utility model connects the bag filter 11 and the sintered plate dust collector 21 in parallel through two dust removal pipes. Under extreme conditions, the dust collector 21 is switched to remove dust from the flue gas, thereby solving the problems of condensation of high-humidity flue gas on bags in extremely cold regions, condensation caused by high-humidity air during the plum rain season, and condensation of flue gas after a long shutdown. This avoids bag blockage in the bag filter 11, reduces the workload of inspection and maintenance of the bag filter 11, and maximizes the dust removal performance of the bag filter 11.

[0034] The following section will provide a detailed description of the pipe connection structure within the flue gas dust removal device of this utility model.

[0035] The flue gas dust removal device described in this utility model is an improved structure based on the existing bag filter 11 dust removal duct. In existing dry dust removal systems for converters, corresponding bag filters 11 are usually installed on the flue for flue gas dust removal. However, in some extreme conditions, such as extremely cold regions and the humid rainy season, the use of bag filters 11 is prone to condensation, which can lead to bag sticking and clogging, resulting in decreased dust removal performance and greater maintenance work.

[0036] Based on the above issues, such as Figure 1 As shown, this utility model connects a dust removal pipe (second dust removal pipe 20) in parallel with an existing dust removal pipe (first dust removal pipe 10), and a sintered plate dust collector 21, which is different from the bag dust collector 11, is installed on the second dust removal pipe 20. The sintered plate dust collector 21 uses a unique corrugated sintered plate filter element to replace the traditional filter bag. Since the sintered plate is a rigid structure, it will not deform and there is no frame wear, so it can maintain a good dust removal effect under the above extreme working conditions.

[0037] Therefore, under the above extreme conditions, the first dust removal duct 10 is closed and the second dust removal duct 20 is opened, and the sintered plate dust collector 21 is used instead of the bag dust collector 11 for flue gas dust removal, thereby avoiding the risk of condensation of the bag dust collector 11.

[0038] The structure and technical effects of the preferred embodiment of the flue gas dust removal device of this utility model will be described in detail below.

[0039] According to one embodiment of the present invention, such as Figure 1 As shown, the first dust removal pipe 10 is equipped with a first switching valve group to control its on / off state, and the second dust removal pipe 20 is equipped with a second switching valve group to control its on / off state.

[0040] Specifically, such as Figure 1As shown, the first switching valve group includes a first switching valve 12 and a second switching valve 13, which are located on the pipes connected to the inlet and outlet ends of the bag filter 11, respectively. The second switching valve group includes a third switching valve 22 and a fourth switching valve 23, both of which are located on the pipes connected to the inlet end of the sintered plate dust collector 21. All four valves—first switching valve 12, second switching valve 13, third switching valve 22, and fourth switching valve 23—are electrically controlled switching valves. Under normal operating conditions, the bag filter 11 is used for flue gas dust removal. At this time, the first switching valve 12 and the second switching valve 13 are opened, the third switching valve 22 and the fourth switching valve 23 are closed, the first dust removal pipeline 10 is open and the second dust removal pipeline 20 is closed. Under extreme operating conditions, the sintered plate dust collector 21 is used for flue gas dust removal. At this time, the third switching valve 22 and the fourth switching valve 23 are opened, the first switching valve 12 and the second switching valve 13 are closed, the second dust removal pipeline 20 is open and the first dust removal pipeline 10 is closed.

[0041] According to one embodiment of the present invention, such as Figure 1 As shown, the first dust removal duct 10 is equipped with multiple bag filters 11, which are connected in parallel or in series.

[0042] Specifically, in this embodiment, such as Figure 1 As shown, multiple bag filters 11 are connected in parallel on the first dust collection duct 10. The first dust collection duct 10 has a flue gas inlet pipe 14 and a flue gas outlet pipe 15. The inlet of each bag filter 11 is connected to the flue gas inlet pipe 14 through an inlet connecting pipe 16, and the outlet of each bag filter 11 is connected to the flue gas outlet pipe 15 through an outlet connecting pipe 17. A first switching valve 12 is provided on the flue gas inlet pipe 14, and a second switching valve 13 is provided on the flue gas outlet pipe 15.

[0043] Implementation Method Two:

[0044] This utility model also provides a converter flue gas dust removal system, which includes: a converter; a flue connected to the converter, the flue being provided with a dust removal section, the dust removal section employing the flue gas dust removal device as described in Embodiment 1; the flue also includes a raw coal gas pipe connected to the flue gas inlet 100 of the flue gas dust removal device, and a clean coal gas pipe connected to the flue gas outlet 200 of the flue gas dust removal device. The structure and technical effects of the flue gas dust removal device have been described in Embodiment 1, and will not be repeated here.

[0045] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A flue gas dedusting device, characterized in that, The device comprises a first dust removal pipeline (10) and a second dust removal pipeline (20) arranged in parallel, two ends of the first dust removal pipeline (10) and the second dust removal pipeline (20) form a flue gas inlet (100) and a flue gas outlet (200) respectively, a bag-type dust collector (11) is arranged on the first dust removal pipeline (10), and a plastic-burning plate dust collector (21) is arranged on the second dust removal pipeline (20); in the state that the second dust removal pipeline (20) is turned on and the first dust removal pipeline (10) is turned off, the plastic-burning plate dust collector (21) replaces the bag-type dust collector (11) to be used for flue gas dust removal, so that flue gas condensation in the bag-type dust collector (11) is avoided.

2. The flue gas dedusting device according to claim 1, characterized in that, A first switch valve group for controlling the opening and closing of the first dust removal pipeline (10) is arranged on the first dust removal pipeline (10), and a second switch valve group for controlling the opening and closing of the second dust removal pipeline (20) is arranged on the second dust removal pipeline (20).

3. The flue gas dedusting device according to claim 2, characterized in that, The first switch valve group comprises a first switch valve (12) and a second switch valve (13), and the first switch valve (12) and the second switch valve (13) are arranged on a pipeline connected to an inlet end of the bag-type dust collector (11) and a pipeline connected to an outlet end of the bag-type dust collector (11) respectively.

4. The flue gas dedusting device according to claim 2, characterized in that, The second switch valve group comprises a third switch valve (22) and a fourth switch valve (23), and the third switch valve (22) and the fourth switch valve (23) are both arranged on a pipeline connected to an inlet end of the plastic-burning plate dust collector (21).

5. The flue gas dedusting device according to claim 1, characterized in that, A plurality of bag-type dust collectors (11) are arranged on the first dust removal pipeline (10), and the plurality of bag-type dust collectors (11) are arranged in parallel or in series.

6. The flue gas dedusting device according to claim 3, characterized in that, A plurality of bag-type dust collectors (11) are arranged on the first dust removal pipeline (10), and the plurality of bag-type dust collectors (11) are arranged in parallel.

7. The flue gas dedusting device according to claim 6, characterized in that The first dust removal pipeline (10) has a flue gas inlet pipe (14) and a flue gas outlet pipe (15), an inlet of each bag-type dust collector (11) is connected to the flue gas inlet pipe (14) through an inlet connecting pipe (16), and an outlet of each bag-type dust collector (11) is connected to the flue gas outlet pipe (15) through an outlet connecting pipe (17).

8. The flue gas dedusting device according to claim 7, characterized in that, The first switch valve (12) is arranged on the flue gas inlet pipe (14), and the second switch valve (13) is arranged on the flue gas outlet pipe (15).

9. A converter fume dedusting system, characterized in that The device comprises: a converter; a flue connected to the converter, and a dust removal section is arranged on the flue, and the dust removal section adopts the flue gas dust removal device according to any one of claims 1-8.

10. The converter flue dust removal system according to claim 9, characterized in that, The flue comprises a raw coal gas pipeline connected to the flue gas inlet (100) and a clean coal gas pipeline connected to the flue gas outlet (200).

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