Tail gas chimney capable of preventing reverse smoke

Abstract

The utility model belongs to the technical field of tail gas treatment, and particularly relates to a reverse smoke prevention tail gas chimney which comprises a main tail gas discharge pipeline, an auxiliary tail gas discharge pipeline, a first tail gas exhaust pipeline and a second tail gas exhaust pipeline. The outer wall of the auxiliary tail gas discharging pipeline is fixedly connected with the inner wall of the main tail gas discharging pipeline through a connecting rod, the first tail gas exhausting pipeline and the second tail gas exhausting pipeline are both horizontally arranged, and the first tail gas exhausting pipeline communicates with the main tail gas discharging pipeline. The second tail gas exhausting pipeline penetrates through the side wall of the main tail gas exhausting pipeline and communicates with the auxiliary tail gas exhausting pipeline, and the second tail gas exhausting pipeline is in sealed connection with the main tail gas exhausting pipeline. According to the device, the way that the two tail gas pipelines collide with the opening of the main tail gas exhaust pipeline is transformed, so that the environment-friendly requirement of field production is met, the phenomenon that tail gas and hydrogen are reversely mixed can be avoided, and the production safety is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment, and in particular relates to a tail gas chimney capable of preventing backflow of smoke. Background Art

[0002] At present, the main technological principle of the reduction process is to reduce the trivalent iron in the titanium liquid produced by sulfuric acid-hydrolyzed titanium dioxide into divalent iron by utilizing the metallic iron in the reduced titanium ore powder. At the same time, the metallic iron in the reduced titanium reacts with the dilute sulfuric acid in the titanium liquid to produce hydrogen, which results in a large amount of flammable and explosive exhaust hydrogen and a small amount of mineral powder smoke during the reaction. In order to ensure production safety and avoid explosion accidents, the safety performance of the exhaust system needs to be strengthened.

[0003] In order to ensure that the reaction system and tail gas pipeline maintain sufficient micro-negative pressure during the production process, and to ensure that the hydrogen generated during the reaction is promptly extracted and safely discharged, the two production systems in this process each have a set of tail gas exhaust pipelines, and the two sets of tail gas exhaust pipelines need to be concentrated and discharged at the junction of the main tail gas emission pipeline. If the tail gas fan of one set of tail gas exhaust pipelines suddenly fails and stops, the tail gas of the other set of pipelines will be reversed into the tail gas pipeline through the junction. Since the main component of the tail gas in this process is flammable and explosive hydrogen, there will be certain safety risks. At present, the main problems encountered are: First, according to environmental protection requirements, it is impossible to add a new tail gas emission pipeline outside the main tail gas emission pipeline; second, because the tail gas contains mineral powder impurities, if the pipeline at the interface is simply changed from horizontal to inclined upward, mineral powder smoke will accumulate at the bend of the pipeline and block the pipeline.

[0004] For this reason, a kind of tail gas chimney of anti-backsmoke is badly needed to solve the above-mentioned problems. Utility Model Content

[0005] In view of the above-mentioned defects in the prior art, the utility model provides an exhaust chimney with anti-backsmoke, comprising a main exhaust gas emission duct, an auxiliary exhaust gas emission duct, a first exhaust gas exhaust duct and a second exhaust gas exhaust duct, the auxiliary exhaust gas emission duct is nested in the main exhaust gas emission duct, and the outer wall of the auxiliary exhaust gas emission duct is fixedly connected to the inner wall of the main exhaust gas emission duct by a connecting rod, the first exhaust gas exhaust duct and the second exhaust gas exhaust duct are both horizontally arranged, the first exhaust gas exhaust duct is connected to the main exhaust gas emission duct, the second exhaust gas exhaust duct passes through the side wall of the main exhaust gas emission duct and is connected to the auxiliary exhaust gas emission duct, and the second exhaust gas exhaust duct and the main exhaust gas emission duct are sealed.

[0006] Optionally, the main exhaust gas exhaust duct, the auxiliary exhaust gas exhaust duct, the first exhaust gas exhaust duct and the second exhaust gas exhaust duct are all made of stainless steel plates or titanium-steel composite plates.

[0007] Specifically, pipes made of this material have good corrosion resistance and a long service life.

[0008] Optionally, a soot filter is provided at the end of the main exhaust gas emission pipe.

[0009] Specifically, the smoke filter adopts an adsorption belt filter in the prior art to filter a small amount of mineral powder smoke carried in the exhaust gas.

[0010] Optionally, exhaust gas fans are provided on both the first exhaust gas exhaust duct and the second exhaust gas exhaust duct.

[0011] The utility model also includes other components that can enable a back-smoke-proof tail gas chimney to be used normally, which are all conventional technical means in the art. In addition, the devices or components not limited in the utility model all adopt conventional technical means in the art.

[0012] The working principle of the utility model is that the exhaust gas generated by one of the production systems in the reduction process enters the auxiliary exhaust gas emission pipe through the first exhaust gas exhaust pipe and is then discharged into the main exhaust gas emission pipe. The exhaust gas generated by the other production system directly enters the main exhaust gas emission pipe through the second exhaust gas exhaust pipe, so that the two parts of exhaust gas are gathered into the main exhaust gas emission pipe for centralized discharge. Once the exhaust gas fan on one of the exhaust gas extraction pipes fails, hydrogen will naturally rise and be discharged due to its small specific gravity, avoiding backflow to another exhaust gas extraction pipe and entering the production system to cause hydrogen flash explosion and cause safety risks.

[0013] The beneficial effects of the utility model are simple structure and low maintenance cost. By adding a secondary exhaust gas emission pipeline in the main exhaust gas emission pipeline, and changing one of the exhaust gas exhaust pipelines to pass through the main exhaust gas emission pipeline and then connect to the newly added secondary exhaust gas emission pipeline inside it, the exhaust gases of the two production systems are finally converged in the main exhaust gas emission pipeline for centralized discharge, thereby meeting the on-site production environmental protection requirements. Even if the exhaust fan on one of the exhaust gas exhaust pipelines fails and stops, hydrogen will not flow back to the other production system, thereby avoiding the safety risk of hydrogen flash explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] In the figure: 1. Main exhaust gas emission pipe, 2. Auxiliary exhaust gas emission pipe, 3. First exhaust gas exhaust pipe, 4. Second exhaust gas exhaust pipe, 5. Connecting rod. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention.

[0018] Example

[0019] like Figure 1 As shown, an embodiment of the utility model provides an exhaust chimney for preventing backsmoke, comprising a main exhaust gas emission duct 1, an auxiliary exhaust gas emission duct 2, a first exhaust gas exhaust duct 3 and a second exhaust gas exhaust duct 4, the auxiliary exhaust gas emission duct 2 is nested in the main exhaust gas emission duct 1, and the outer wall of the auxiliary exhaust gas emission duct 2 is fixedly connected to the inner wall of the main exhaust gas emission duct 1 by a connecting rod 5, the first exhaust gas exhaust duct 3 and the second exhaust gas exhaust duct 4 are both horizontally arranged, the first exhaust gas exhaust duct 3 is connected to the main exhaust gas emission duct 1, the second exhaust gas exhaust duct 4 passes through the side wall of the main exhaust gas emission duct 1 and is connected to the auxiliary exhaust gas emission duct 2, and the second exhaust gas exhaust duct 4 and the main exhaust gas emission duct 1 are sealed.

[0020] The main exhaust gas emission pipeline 1, the auxiliary exhaust gas emission pipeline 2, the first exhaust gas exhaust pipeline 3 and the second exhaust gas exhaust pipeline 4 are all made of titanium steel composite plates. Pipes made of this material have good corrosion resistance and long service life.

[0021] A smoke filter (not shown) is provided at the end of the main exhaust gas emission pipe 1. The smoke filter (not shown) adopts an adsorption belt filter in the prior art to filter a small amount of mineral powder smoke carried in the exhaust gas.

[0022] The first exhaust gas exhaust duct 3 and the second exhaust gas exhaust duct 4 are both provided with exhaust gas fans (not shown in the figure).

[0023] The working principle of the utility model is that the exhaust gas generated by one of the production systems in the reduction process enters the auxiliary exhaust gas emission pipeline 2 through the first exhaust gas exhaust duct 3, and is then discharged into the main exhaust gas emission pipeline 1, and the exhaust gas generated by the other production system directly enters the main exhaust gas emission pipeline 1 through the second exhaust gas exhaust duct 4, so that the two parts of exhaust gas converge into the main exhaust gas emission pipeline 1 for centralized discharge; once the exhaust fan (not shown in the figure) on one of the exhaust gas extraction pipelines fails, due to the small specific gravity of hydrogen, it will naturally rise and be discharged, avoiding backflow to another exhaust gas extraction pipeline and entering the production system to cause hydrogen flash explosion and cause safety risks.

[0024] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An anti-smoke backflow tail gas chimney, comprising a main tail gas exhaust pipe, a secondary tail gas exhaust pipe, a first tail gas exhaust pipe and a second tail gas exhaust pipe, characterized in that: The auxiliary exhaust gas emission duct is nested inside the main exhaust gas emission duct, and the outer wall of the auxiliary exhaust gas emission duct is fixedly connected to the inner wall of the main exhaust gas emission duct through a connecting rod, the first exhaust gas exhaust duct and the second exhaust gas exhaust duct are both horizontally arranged, the first exhaust gas exhaust duct is connected to the main exhaust gas emission duct, the second exhaust gas exhaust duct passes through the side wall of the main exhaust gas emission duct and is connected to the auxiliary exhaust gas emission duct, and the second exhaust gas exhaust duct and the main exhaust gas emission duct are sealed.

2. The exhaust chimney for preventing backflow of smoke according to claim 1, characterized in that: The main tail gas exhaust pipe, the auxiliary tail gas exhaust pipe, the first tail gas exhaust pipe and the second tail gas exhaust pipe are all made of stainless steel plates or titanium steel composite plates.

3. The exhaust chimney for preventing backflow of smoke according to claim 1, characterized in that: A smoke filter is provided at the end of the main exhaust gas emission pipe.

4. The exhaust chimney for preventing backflow of smoke according to claim 1, characterized in that: Exhaust gas fans are provided on both the first exhaust gas exhaust duct and the second exhaust gas exhaust duct.

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