Herringbone flue gas pipeline

Abstract

The utility model discloses a herringbone flue gas pipeline which comprises a gas inlet pipe, a gas outlet pipe, a first connecting pipe and a second connecting pipe, the air outlet end of the air inlet pipe is fixedly communicated with the air inlet end of the air outlet pipe to form a herringbone pipeline; one end of the first connecting pipe is fixed on the outer wall of the air inlet pipe, the inner cavity is communicated with the air inlet end of the air inlet pipe, one end of the second connecting pipe is fixed on the outer wall of the air outlet pipe, and the inner cavity is communicated with the air outlet end of the air outlet pipe; cleaning manholes are formed in the top end of the herringbone pipeline and two limbs of the herringbone pipeline; and the cleaning manholes can be sealed through manhole plugs. High-temperature flue gas enters the inner cavity of the herringbone pipeline from the gas inlet pipe and ascends firstly and then descends, part of smoke dust and tiny particle materials are settled and separated from the flue gas in the ascending process, the smoke dust rate of the electric furnace is reduced, and when slag bonding occurs in the flue, the manhole plug can be opened to manually enter the flue for cleaning; and the influence of flue gas pipeline slagging on electric furnace production is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of metal smelting flue gas pipelines, and more specifically to a herringbone flue gas pipeline. Background Art

[0002] At present, the high-temperature flue gas pipeline of an electric furnace is generally a straight pipe connected between the top of the furnace wall of the electric furnace and the afterburner chamber. A large amount of fine particulate materials and soot are drawn into the dust collection system along with the high-temperature flue gas, resulting in an increase in the dust rate of the electric furnace. As the impurity elements in the raw materials increase, impurity elements such as zinc and cadmium are easily volatilized into the soot, but their condensation temperature is relatively high. Therefore, slagging is likely to occur in the flue. It is difficult to clean and discharge the slag in the horizontal section of the flue gas pipeline, and the labor intensity of workers is high, which affects the production of the electric furnace. The flue gas pipeline is arranged at the top of the furnace wall, resulting in a reduction in the volume of the electric furnace and a decrease in the hearth index, affecting the production capacity.

[0003] Therefore, how to provide a flue gas pipeline that can meet the scouring and flowing conditions of high-temperature flue gas in an electric furnace, reduce the dust rate, make the slagging of the flue gas pipeline easy to clean and discharge, reduce the labor intensity of workers, and increase the hearth index is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0004] In view of this, the utility model provides a herringbone flue gas pipeline. The flue gas pipeline is in a herringbone shape. When the high-temperature flue gas of the electric furnace passes through the herringbone flue gas pipeline, partial separation of soot and flue gas can be achieved, reducing the dust rate. By pouring high-aluminum steel fiber castable between the outer pipe and the inner pipe, and filling the inner part of the manhole plug with corundum refractory castable, the sealing performance and heat scouring resistance of the herringbone flue gas pipeline are improved. The exhaust holes in the inner pipe can prevent the pipeline from bursting at high temperatures, achieving the improvement of the safety of the herringbone flue gas pipeline.

[0005] In order to achieve the above object, the utility model adopts the following technical solutions:

[0006] A herringbone flue gas pipeline, comprising an intake pipe, an outlet pipe, a first connecting pipe, and a second connecting pipe;

[0007] The outlet end of the intake pipe is fixedly communicated with the intake end of the outlet pipe to form a herringbone pipeline;

[0008] One end of the first connecting pipe is fixed on the outer wall of the intake pipe, and its inner cavity is communicated with the intake end of the intake pipe. One end of the second connecting pipe is fixed on the outer wall of the outlet pipe, and its inner cavity is communicated with the outlet end of the outlet pipe;

[0009] Wherein, cleaning manholes are provided at the top of the herringbone pipeline and at the top of the two limbs of the herringbone pipeline opposite to the first connecting pipe and the second connecting pipe, and the cleaning manholes can be closed by manhole plugs.

[0010] The beneficial effects of the above technical solution are as follows: The high-temperature flue gas enters the inner cavity of the chevron-shaped pipe from the inlet pipe, first rises and then falls. During the rising process, part of the soot and tiny particulate materials settle and separate from the flue gas, reducing the dust rate of the electric furnace. When slagging occurs in the flue, the manhole plug can be opened to allow personnel to enter the inside of the flue manually for cleaning, avoiding the impact of slagging in the flue gas pipe on the production of the electric furnace.

[0011] Preferably, the inlet pipe, the outlet pipe, the first connecting pipe, and the second connecting pipe all include an outer pipe and an inner pipe that is coaxially and spacedly sleeved and fixed inside the inner cavity of the outer pipe. Anchor studs are fixed on the inner wall of the outer pipe, and steel fibers are cast between the inner wall of the outer pipe and the outer wall of the inner pipe. The anchor studs and steel fibers are used to improve the strength, high-temperature resistance, and corrosion resistance of the flue.

[0012] Preferably, a plurality of exhaust holes are formed on the pipe wall of the inner pipe. The exhaust holes can prevent the pipe from deforming due to thermal expansion and contraction and exploding due to high-temperature impact expansion, improving the safety performance of the flue.

[0013] Preferably, the number of the manhole plugs is three. Each of the three manhole plugs includes a plunger and a cover plate. The cover plate is fixed to the top end of the plunger. The three plungers are respectively inserted into the three cleaning manholes in a one-to-one correspondence, and the bottom surface of the corresponding cover plate abuts against the end faces of the chevron-shaped pipe, the first connecting pipe, and the inlet pipe corresponding to the cleaning manholes. The manhole plug can seal the cleaning manhole to prevent soot from leaking into the external environment during use. The manhole plug can be pulled out to clean the inner cavity of the flue.

[0014] Preferably, the plunger is a hollow cylinder, and catch nails are fixed on its inner wall. The inner cavity of the plunger is filled with corundum refractory castable. While improving the high-temperature resistance, corrosion resistance, and strength of the manhole plug, the manhole plug can be pressed tightly in the cleaning manhole under its own weight for sealing.

[0015] Preferably, a lifting lug is fixed on the panel of the cover plate away from the plunger. The lifting lug can be used in conjunction with a lifting device to install and pull out the manhole plug.

[0016] Preferably, the intake end of the inlet pipe is fixed to the furnace cover of the electric furnace and communicates with the inner cavity of the furnace body. The outlet end of the outlet pipe is fixedly connected to the afterburner chamber. The high-temperature flue gas generated by the electric furnace rises and then falls along the chevron-shaped pipe. During the rising process, part of the soot and tiny particulate materials settle and separate from the flue gas, and the flue gas finally enters the afterburner chamber for repeated combustion.

[0017] As can be seen from the above technical solutions, compared with the prior art, the present utility model discloses a herringbone flue gas duct. By installing the herringbone duct on the top of the electric furnace roof cover to convey high-temperature flue gas to the afterburning chamber, it does not occupy the furnace wall, increases the volume of the electric furnace, improves the hearth index and production capacity of the electric furnace; as the high-temperature flue gas rises and then descends along the herringbone flue gas duct, some dust and fine particulate materials settle and separate from the flue gas during the rising process, reducing the dust rate of the electric furnace.

[0018] A cleaning manhole is provided at the top end of the duct. By lifting the manhole plug, the slag in the duct can be cleaned. At the same time, the slag falls into the electric furnace and the afterburning chamber. The cleaning of the slag is convenient, efficient, and the labor intensity of the personnel is low. It is cleaned once per shift to avoid the impact of slag accumulation in the flue gas duct on the production of the electric furnace.

[0019] The herringbone flue gas duct is composed of an outer pipe and an inner pipe. Anchor bolts are provided on the inner wall of the outer pipe. High-aluminum steel fiber castable is cast between the outer pipe and the inner pipe. The overall strength is high, and it is resistant to high-temperature flue gas scouring and corrosion; the inner pipe is provided with exhaust holes as a whole to avoid deformation due to thermal expansion and contraction of the pipe and explosion due to thermal shock expansion, improving the overall strength and safety performance of the herringbone flue gas duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0021] Figure 1 Schematic structural diagram of the herringbone flue provided by the present utility model;

[0022] Figure 2 For Figure 1 A-A cross-sectional view in

[0023] Figure 3 Top view of the herringbone flue provided by the present utility model;

[0024] Figure 4 Schematic structural diagram of the manhole plug provided by the present utility model;

[0025] Figure 5 For Figure 4 B-B cross-sectional view in

[0026] Among them,

[0027] 1 - Inlet pipe; 2 - Outlet pipe; 3 - First connecting pipe; 4 - Second connecting pipe; 5 - Cleaning manhole; 6 - Steel fiber; 7 - Anchor nail; 8 - Exhaust hole; 9 - Manhole plug; 91 - Plunger; 92 - Cover plate; 93 - Lifting lug; 10 - Grab nail; 11 - Corundum refractory castable. Detailed implementation mode

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] See the attached Figures 1 to 5 , the embodiments of the present invention disclose a herringbone flue gas pipeline, including an inlet pipe 1, an outlet pipe 2, a first connecting pipe 3 and a second connecting pipe 4;

[0030] The outlet end of the inlet pipe 1 is fixedly communicated with the inlet end of the outlet pipe 2 to form a herringbone pipeline;

[0031] One end of the first connecting pipe 3 is fixed on the outer wall of the inlet pipe 1, and its inner cavity is communicated with the inlet end of the inlet pipe 1. One end of the second connecting pipe 4 is fixed on the outer wall of the outlet pipe 2, and its inner cavity is communicated with the outlet end of the outlet pipe 2;

[0032] Among them, cleaning manholes 5 are provided at the top of the herringbone pipeline and at the tops of the two limbs of the herringbone pipeline relative to the first connecting pipe 3 and the second connecting pipe 4, and the cleaning manholes 5 can be closed by manhole plugs 9.

[0033] In this embodiment, the inlet end of the inlet pipe 1 is fixed to the electric furnace cover and communicated with the inner cavity of the furnace body, and the outlet end of the outlet pipe 2 is fixedly communicated with the afterburning chamber.

[0034] As Figure 1 shown, the inlet end of the inlet pipe is the flue gas inlet, and the outlet end of the outlet pipe is the flue gas outlet. After the flue gas enters the herringbone pipeline, it rises and then descends. During the rising process, part of the soot and fine particulate materials settle and are separated from the flue gas, reducing the electric furnace soot rate; the first connecting pipe is communicated with the inlet end of the inlet pipe, the second connecting pipe is communicated with the outlet end of the outlet pipe, and cleaning manholes are provided at the top of the first connecting pipe, the second connecting pipe and the herringbone pipeline. Workers can enter the cleaning manholes to clean the slag adhering to the inner wall of the pipeline. The cleaned slag will fall into the electric furnace and the afterburning chamber, making the cleaning of the slag in the flue gas pipeline more convenient and efficient.

[0035] In order to further optimize the above technical solution, the intake pipe 1, the exhaust pipe 2, the first connecting pipe 3 and the second connecting pipe 4 all include an outer pipe and an inner pipe that is coaxially and spacedly sleeved and fixed in the inner cavity of the outer pipe. Anchor nails 7 are fixed on the inner wall of the outer pipe, and steel fibers 6 are cast between the inner wall of the outer pipe and the outer wall of the inner pipe.

[0036] As Figure 2 and 3 shown, the intake pipe, the exhaust pipe, the first connecting pipe and the second connecting pipe are all annular sleeves. Steel fibers are cast between the inner and outer pipes, and at the same time, anchor nails are fixed between the inner wall of the outer pipe and the outer wall of the inner pipe, increasing the overall strength of the herringbone flue and improving its high-temperature erosion resistance and corrosion resistance.

[0037] In order to further optimize the above technical solution, avoid the thermal expansion and contraction deformation and high-temperature impact expansion and explosion of the herringbone pipeline, and improve the safety performance of the herringbone flue, a plurality of exhaust holes 8 are opened on the pipe wall of the inner pipe.

[0038] In this embodiment, in order to better seal the cleaning manhole, the number of manhole plugs 9 is three. The three manhole plugs 9 all include a plunger 91 and a cover plate 92. The cover plate 92 is fixed at the top of the plunger 91. The three plungers 91 are respectively inserted into the three cleaning manholes 5 one by one, and the bottom surface of the corresponding cover plate 92 abuts against the end surface of the herringbone pipeline, the first connecting pipe 3 and the intake pipe 1 corresponding to the cleaning manhole 5. By inserting the plunger into the cleaning manhole and covering the cleaning manhole with the cover plate, the sealing effect of the cleaning manhole is ensured.

[0039] In order to further optimize the above technical solution, improve the strength of the manhole plug and its high-temperature flue gas erosion resistance, the plunger 91 is a hollow cylinder, and grab nails 10 are fixed on its inner wall. The inner cavity of the plunger 91 is filled with corundum refractory castable 11. The weight of the plunger is increased by the castable, and when installed, the plunger can be inserted into the cleaning manhole under the action of its own weight to seal the cleaning manhole.

[0040] In order to further optimize the above technical solution and facilitate the installation and removal of the manhole plug, a lifting lug 93 is fixed on the panel of the cover plate 92 away from the plunger 91.

[0041] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0042] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A herringbone flue gas duct, characterized in that, It includes an intake pipe (1), an outlet pipe (2), a first connecting pipe (3) and a second connecting pipe (4); The air outlet end of the intake pipe (1) is fixedly communicated with the air inlet end of the outlet pipe (2) to form a chevron-shaped pipe; One end of the first connecting pipe (3) is fixed on the outer wall of the intake pipe (1), and its inner cavity is communicated with the air inlet end of the intake pipe (1). One end of the second connecting pipe (4) is fixed on the outer wall of the outlet pipe (2), and its inner cavity is communicated with the air outlet end of the outlet pipe (2); Wherein, cleaning manholes (5) are opened at the top of the chevron-shaped pipe and at the top ends of the two limbs of the chevron-shaped pipe relative to the first connecting pipe (3) and the second connecting pipe (4), and the cleaning manholes (5) can be closed by manhole plugs (9).

2. The herringbone flue gas duct according to claim 1, characterized in that, The intake pipe (1), the outlet pipe (2), the first connecting pipe (3) and the second connecting pipe (4) all include an outer pipe and an inner pipe that is coaxially and spacedly sleeved and fixed in the inner cavity of the outer pipe. Anchor nails (7) are fixed on the inner wall of the outer pipe, and steel fibers (6) are cast between the inner wall of the outer pipe and the outer wall of the inner pipe.

3. The herringbone flue gas duct according to claim 2, characterized in that, A plurality of exhaust holes (8) are opened on the pipe wall of the inner pipe.

4. A herringbone flue gas duct according to claim 1, characterized in that, The number of the manhole plugs (9) is three. The three manhole plugs (9) all include a plunger (91) and a cover plate (92). The cover plate (92) is fixed at the top end of the plunger (91). The three plungers (91) are respectively inserted into the three cleaning manholes (5) one by one, and the bottom surface of the corresponding cover plate (92) abuts against the end surface of the chevron-shaped pipe, the first connecting pipe (3) and the intake pipe (1) corresponding to the cleaning manhole (5).

5. A herringbone flue gas duct according to claim 4, characterized in that, The plunger (91) is a hollow cylinder, and grab nails (10) are fixed on its inner wall. The inner cavity of the plunger (91) is filled with corundum refractory castable (11).

6. The herringbone flue gas duct according to claim 4, characterized in that, A lifting lug (93) is fixed on the panel of the cover plate (92) away from the plunger (91).

7. A herringbone flue gas duct according to any one of claims 1 to 6, characterized in that, The air inlet end of the intake pipe (1) is fixed to the electric furnace cover and communicated with the inner cavity of its furnace body. The air outlet end of the outlet pipe (2) is fixedly communicated with a afterburner chamber.

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