CN209762721U - Filter device for gas pipeline and high coke mixed gas pipeline - Google Patents

Abstract

The utility model relates to a filter device for gas pipelines, which comprises a filter tube shell and an annular filter screen plate, the inner cavity of the filter tube shell is divided into a filter chamber and an outlet room by a partition plate, and the annular filter screen plate is arranged in the filter room and includes An annular porous metal plate and an annular filter screen sheathed outside the porous metal plate, the inner ring cavity of the porous metal plate is in communication with the outlet chamber. It also relates to a high-coke mixed gas pipeline, in which the above-mentioned filter device is arranged on the mixed gas main pipe or respectively on the blast furnace gas branch pipe and the coke oven gas branch pipe. The above-mentioned filter device has a larger filter area, better filter effect, and a lower probability of filter blockage; the filter device is used on the high-coke mixed gas pipeline to remove solid and/or liquid impurities carried in the gas, and avoid these impurities Dissolved in water to cause electrochemical corrosion, avoiding the chemical reaction of these impurities in the presence of water to increase the electrochemical corrosion rate or generate blockages, reducing the risk of gas pipeline blockage.

Description

Filter device for gas pipeline and high coke mixed gas pipeline

technical field

The utility model relates to a filter device for a gas pipeline and a high-coke mixed gas pipeline provided with the filter device.

Background technique

High-coke mixed gas is usually used as fuel in steel rolling furnaces in steel plants. The components of blast furnace gas (dry bag dust removal) are N ₂ (55-60%), CO (28-33%), CO ₂ (6-12%) ), H ₂ (1-4%), hydrocarbons (0.2-0.5%), and a small amount of impurities such as SO ₂ , HCl and dust. The dust content of blast furnace gas (dry bag dust removal) is below 10 mg/m ³ , Its main component is Fe ₂ O ₃ (70%), followed by Na ₂ O (7.5%), SiO ₂ (7%), Al ₂ O ₃ (4.5%) and CaO (4%). The main components of coke oven gas are H ₂ (55-60%) and CH ₄ (23-27%), and also contain a small amount of CO (5-8%), unsaturated hydrocarbons above C ₂ (2-4%) , CO ₂ (1.5~3%), O ₂ (0.3~0.8%), N ₂ (3~7%), H ₂ S (below 15mg/m ³ ), the dust contained in coke oven gas is mainly carbon powder host.

Blast furnace gas and coke oven gas contain saturated water. After high-coke gas is mixed, in the case of condensed water, SO ₂ , HCl, H ₂ S, etc. dissolve in water and are prone to electrochemical corrosion. In addition, after the blast furnace gas and coke oven gas are mixed, the impurities contained in the two are prone to chemical reactions in the environment with water, such as:

Fe ₂ O ₃ +3H ₂ S→Fe ₂ S ₃ +3H ₂ O

2Fe ₂ S ₃ +3O ₂ →2Fe ₂ O ₃ +6S

Na2O ₊ H2S _→ Na2S _{+ H2O}

CaO+SO ₂ →CaSO ₃

Some of the products of the chemical reaction dissolve in water to increase the rate of electrochemical corrosion (such as Na ₂ S), and some of them form precipitates that become plugs (such as simple S). The chemical corrosion products are very easy to block the valve after the throttle valve.

Utility model content

The embodiment of the utility model relates to a filter device for a gas pipeline and a high-coke mixed gas pipeline provided with the filter device, which can at least solve some defects of the prior art.

The embodiment of the utility model relates to a filter device for gas pipelines, which includes a filter shell and an annular filter screen plate, the inner cavity of the filter shell is divided into a filter chamber and an outlet chamber by a partition, and the annular filter screen plate Arranged in the filter chamber, the annular filter plate includes an annular porous metal plate and an annular filter screen sheathed outside the porous metal plate, the inner ring cavity of the porous metal plate is connected with the guide chamber Pass.

As one of the embodiments, the partition is an annular plate connected to the bottom end of the annular filter plate, and the hollow cavity of the partition communicates with the inner annular cavity of the porous metal plate and the outlet chamber respectively.

As one of the embodiments, the baffle extends obliquely upward from the bottom end of the annular filter screen until it abuts against the inner wall of the filter shell.

As one of the embodiments, the angle between the partition and the vertical direction is 30-60°.

As one of the embodiments, the partition includes an upper dust collection plate and a lower isolation plate, the upper dust collection plate is fixedly connected with the porous metal plate and abuts against the inner wall of the filter shell, and the lower isolation plate fixed on the inner wall of the filter tube shell.

As one of the embodiments, the upper surface of the lower insulation board is provided with a gasket layer.

As one of the embodiments, the top opening of the filter casing is provided with a fixed flange and a movable flange located above the fixed flange and connected to the fixed flange at the top opening, the porous metal plate and The annular filter screens are all fixed on the bottom flange surface of the movable flange.

As one of the embodiments, the inlet end and the outlet end of the filter shell are provided with mounting flanges for connecting with the gas pipeline.

The embodiment of the utility model relates to a high-coke mixed gas pipeline, including a mixed gas main pipe and a blast furnace gas branch pipe and a coke oven gas branch pipe connected to the mixed gas main pipe. The filtering device for the gas pipeline, or the blast furnace gas branch pipe and the coke oven gas branch pipe are provided with the above-mentioned filtering device for the gas pipeline.

As one of the embodiments, the mixed gas main pipe is provided with a throttling device; when the mixed gas main pipe is provided with the filter device for the gas pipeline, the filter shell is arranged on the throttling device entrance side.

Embodiments of the utility model have at least the following beneficial effects:

In the filter device provided by the utility model, an annular filter screen plate is arranged in the filter tube shell, and an annular external gas circulation space is formed between the annular filter screen plate and the filter chamber. When the gas enters the filter tube shell, it disperses in the In the external gas circulation space, it is filtered through an annular filter screen plate. Based on this structure, on the one hand, the filtering area of the filtering device can be effectively increased to improve the filtering effect, and on the other hand, the probability of clogging of the filter screen can be reduced.

The high-coke mixed gas pipeline provided by the utility model can ensure the cleanliness of the high-coke mixed gas by setting the above-mentioned filter device, and can remove solid and/or liquid impurities carried in the blast furnace gas/coke oven gas/high-coke mixed gas, Thereby avoiding the electrochemical corrosion of these impurities dissolved in water, and avoiding the chemical reaction of these impurities in the environment with water to increase the electrochemical corrosion rate or generate blockages, and reduce the risk of gas pipeline blockage.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

Fig. 1 is a structural schematic diagram of a filter device for a gas pipeline provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Embodiment one

As shown in Fig. 1, the utility model embodiment provides a kind of filter device for gas pipeline, including filter shell 100 and annular filter screen plate 102, and the inner cavity of the filter shell 100 is divided into filter chamber and outlet by partition 101 chamber, the annular filter plate 102 is arranged in the filter chamber, the annular filter plate 102 includes an annular porous metal plate 1021 and an annular filter screen 1022 sleeved outside the porous metal plate 1021, the The inner annular cavity of the porous metal plate 1021 is in communication with the outlet chamber.

It can be understood that the filter shell 100 has an inlet port and an outlet port, the inlet port communicates with the filter chamber for introducing gas, and the outlet port communicates with the outlet chamber for exporting gas. The above-mentioned filter shell 100 can be connected with the gas pipeline 200 as a non-detachable integrated structure, for example, the inlet end and the outlet end are respectively welded to the gas pipeline 200; in this embodiment, the filter shell 100 is preferably detachably installed to the gas pipeline 200 to facilitate maintenance and repair, or the filter device can be used on different gas pipelines 200 as required. Specifically, as shown in FIG. 1 , the inlet end and the outlet end of the filter shell 100 are provided with installation flanges 105 for connecting with the gas pipeline 200 , and the flange connection structure is easy to install and disassemble.

In the filter device provided in this embodiment, an annular filter screen plate 102 is arranged in the filter tube shell 100, and an annular external gas circulation space is formed between the annular filter screen plate 102 and the filter chamber, and the gas enters the filter tube shell 100. When it is dispersed in the external gas circulation space, it is filtered through the annular filter screen plate 102. Based on this structure, on the one hand, the filtering area of the filtering device can be effectively increased to improve the filtering effect; on the other hand, the probability of clogging of the filter screen 1022 can be reduced.

In addition, the porous metal plate 1021 is used to cover the ring-shaped filter screen 1022, which can form two filter layers and obtain a better filtering effect. Moreover, the inner porous metal plate 1021 can support the outer ring-shaped filter screen 1022 to ensure The filtering effect and service life of the annular filter screen 1022.

In one of the embodiments, the above-mentioned annular filter screen 1022 can adopt wire mesh or polymer filter cloth; when using wire mesh, it is preferably a structure in which multiple layers of wire mesh are nested in sequence, and the wire mesh is preferably High mesh wire mesh.

Further optimize the structure of the above-mentioned filter device, the outlet end of the above-mentioned annular filter screen 102 is preferably installed on the dividing plate 101, and the entrance of the annular filter screen 102 is the filter channel on the annular filter screen 1022 and the porous metal plate 1021; For example, the partition plate 101 divides the inner chamber of the filter tube housing 100 into left and right chambers, that is, the filter chamber and the outlet chamber are arranged left and right, and the axial direction of the above-mentioned annular filter screen plate 102 can be set to be horizontal, and one end of the filter plate 102 can be closed and fixed on the On the inner wall of the filter tube shell 100, the other end is an open end and is installed on the partition 101, and it is sufficient to open a flow hole on the partition 101; in another embodiment, as shown in Figure 1, the above partition 101 will The inner cavity of the filter shell 100 is divided into upper and lower chambers, that is, the filter chamber and the outlet chamber are arranged up and down, then the axial direction of the above-mentioned annular filter screen plate 102 can be set to be vertical, and its top end is closed and fixed on the top of the filter shell 100. The bottom end is an open end and is installed on the partition 101 , and the partition 101 is correspondingly provided with flow holes. It is easy to understand that the above-mentioned separator 101 is an annular plate, and the middle through hole/hollow cavity is the above-mentioned through-flow hole, which communicates with the inner ring cavity of the porous metal plate 1021 and the outlet chamber respectively, and the through-flow hole The hole diameter is preferably the same as the inner ring diameter of the porous metal plate 1021 .

In this embodiment, it is preferable to adopt a structure in which the filter chamber and the outlet chamber are arranged up and down; further, as shown in Fig. The inner walls of the case 100 abut against each other. Based on this structure, the separator 101 can be spliced with the annular filter plate 102 to form a groove structure, which facilitates the collection of dust filtered by the annular filter 1022 and the porous metal plate 1021 . Preferably, the angle between the partition 101 and the vertical direction is 30-60°, preferably 45°.

Further preferably, as shown in FIG. 1 , the partition 101 includes an upper dust collecting plate 1012 and a lower separating plate 1011, the upper dust collecting plate 1012 is fixedly connected to the porous metal plate 1021 and connected to the inner wall of the filter tube shell 100 Adjacent, the lower isolation plate 1011 is fixed on the inner wall of the filter casing 100 . The upper dust collecting board 1012 and the lower separating board 1011 are split structures, that is, the upper dust collecting board 1012 can be separated from the lower separating board 1011, so that the upper dust collecting board 1012 can be easily taken out and the collected dust can be poured out.

That is, the porous metal plate 1021 can be separated from the lower isolation plate 1011. For example, an embedding groove is set on the isolation plate 1011, and an embedding block is correspondingly protruded from the bottom end of the porous metal plate 1021, so that the porous metal plate 1021 Pluggable mounting connection with isolation board 1011. Of course, based on the inclined structure of the isolation plate 1011 and the limiting effect of the inner wall of the filter tube shell 100, the dust collecting plate 1012 can also be directly supported on the isolation plate 1011, which can ensure that the annular filter screen plate 102 will not fall.

Further preferably, as shown in Fig. 1, for the above-mentioned ash collecting plate 1012 and the upper and lower separation structure of the isolation plate 1011, the upper surface of the lower isolation plate 1011 is provided with a gasket layer 1013, so as to prevent gas from slipping between the two. .

The ash collecting plate 1012 is preferably a thin metal plate, and it is further preferably integrally formed with the porous metal plate 1021; the above-mentioned isolation plate 1011 is also a metal plate, so as to ensure corrosion resistance, wear resistance and service life. The above-mentioned gasket layer 1013 can adopt conventional seals such as rubber gaskets.

Correspondingly, in order to facilitate the removal of the annular filter screen plate 102, it is preferable to set the top of the filter casing 100 to be openable, for example, to set an openable and closable inspection window and the like. In this embodiment, the following preferred structure is adopted:

As shown in Fig. 1 , the top opening of the filter casing 100 is provided with a fixed flange 104 and a movable flange 103 located above the fixed flange 104 and connected to the fixed flange 104 at the top opening. Both the metal plate 1021 and the annular filter screen 1022 are fixed on the bottom flange surface of the movable flange 103 . When the annular filter screen plate 102 needs to be replaced/cleaned, after removing the connection structure between the movable flange 103 and the fixed flange 104, the movable flange 103 can be lifted to remove the porous metal plate 1021 and the annular filter screen 1022, especially, When the dust-collecting plate 1012 is fixed on the bottom of the porous metal plate 1021, the dust-collecting plate 1012 can be taken out together, so that the collected dust etc. can be easily poured out.

The embodiment of the utility model also provides a high-coke mixed gas pipeline, including a mixed gas main pipe and a blast furnace gas branch pipe and a coke oven gas branch pipe connected to the mixed gas main pipe. The mixed gas main pipe is provided with the above-mentioned The filter device for the gas pipeline, or, the above-mentioned filter device for the gas pipeline is provided on the blast furnace gas branch pipe and the coke oven gas branch pipe. Through this structure, the cleanliness of the high-coke mixed gas can be guaranteed, and the solid and/or liquid impurities carried in the blast furnace gas/coke oven gas/high-coke mixed gas can be removed, thereby avoiding electrochemical corrosion of these impurities caused by dissolving in water, and Avoid chemical reactions of these impurities in the environment with water to increase the electrochemical corrosion rate or generate blockages, reducing the risk of gas pipeline 200 blockage.

Further, the mixed gas main pipe is provided with a throttling device; when the mixed gas main pipe is provided with the filter device for the gas pipeline, the filter shell 100 is arranged on the inlet side of the throttling device , thereby reducing the risk of blockage/corrosion of the throttling device. The aforementioned throttling device may be a throttling valve or a flow orifice, which is selected according to the actual situation. Its specific structure is well known in the art and will not be repeated here.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (10)

1. A filter device for a gas pipeline, characterized in that: including filtering tube shell and annular filter screen board, filter the tube shell inner chamber and separate for filter chamber and derivation room through the baffle, annular filter screen board arrange in the filter chamber, annular filter screen board includes annular porous metal sheet and cover and locates annular filter screen outside the porous metal sheet, the inner ring cavity of porous metal sheet with derivation room switches on.

2. The filtering device for gas pipelines according to claim 1, wherein: the baffle is an annular plate and is connected to the bottom end of the annular filter screen plate, and the hollow cavity of the baffle is communicated with the inner annular cavity of the porous metal plate and the guide-out chamber respectively.

3. The filtering device for gas pipelines according to claim 2, wherein: the baffle extends upwards from the bottom end of the annular filter screen plate in an inclined manner to abut against the inner wall of the filter pipe shell.

4. The filtering device for gas pipelines according to claim 3, wherein: the included angle between the partition plate and the vertical direction is 30-60 degrees.

5. The filtering device for gas pipes according to any one of claims 2 to 4, characterized in that: the partition board comprises an upper ash collecting board and a lower partition board, the upper ash collecting board is fixedly connected with the porous metal plate and is attached to the inner wall of the filtering pipe shell, and the lower partition board is fixed on the inner wall of the filtering pipe shell.

6. The filtering device for gas pipelines according to claim 5, wherein: and a sealing cushion layer is arranged on the upper plate surface of the lower isolation plate.

7. The filtering device for gas pipelines according to claim 1, wherein: the filter shell is characterized in that the top opening of the filter shell is provided with a fixed flange and a movable flange which is positioned above the fixed flange and connected with the fixed flange, and the porous metal plate and the annular filter screen are fixed on the bottom flange surface of the movable flange.

8. The filtering device for gas pipelines according to claim 1, wherein: and the inlet end and the outlet end of the filter pipe shell are respectively provided with an installation flange for butting with a gas pipeline.

9. A high-coke mixed gas pipeline comprises a mixed gas main pipe, and a blast furnace gas branch pipe and a coke oven gas branch pipe which are connected with the mixed gas main pipe, and is characterized in that: the main mixed gas pipe is provided with the filtering device for the gas pipeline according to any one of claims 1 to 8, or the blast furnace gas branch pipe and the coke oven gas branch pipe are provided with the filtering device for the gas pipeline according to any one of claims 1 to 8.

10. The high coke mixing gas pipeline of claim 9, wherein: a throttling device is arranged on the mixed gas main pipe; when the filtering device for the gas pipeline is arranged on the mixed gas main pipe, the filtering pipe shell is arranged on the inlet side of the throttling device.