Tar processing tail gas purification structure

Abstract

The utility model relates to the technical field of tar processing, in particular to the technical field of tar processing tail gas treatment, and particularly relates to a tar processing tail gas purification structure. In order to solve the problem that the existing tar processing tail gas purification treatment process is easy to cause burning explosion and unstable combustion of a tubular furnace, the utility model provides a novel tar processing tail gas purification structure, and the port of a tail gas output pipeline of an induced draft fan extends into a water seal tank and is lower than the top port of an overflow pipe; a circulating liquid inlet of the water seal tank is communicated with a circulating liquid outlet of the oil separation tank through a pipeline and a circulating pump, a top tail gas outlet of the water seal tank is communicated with a mist catching tail gas inlet of the mist catcher, and a bottom liquid outlet of the mist catcher is communicated with a top self-flowing opening of the oil separation tank. And a mist catching tail gas outlet of the mist catcher is communicated with a tail gas inlet on a combustion coil in the tubular furnace through a combustion tube. The structure ensures safe and stable combustion of the tubular furnace, so that safe and stable production is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of tar processing, in particular to the technical field of tar processing tail gas treatment, and specifically relates to a tar processing tail gas purification structure. Background Technique

[0002] During the production process of tar processing, a large amount of tail gas will be generated. The tail gas contains a variety of organic substances and has a complex composition. Due to the high temperature, some light fractions such as benzene, naphthalene, phenol, pitch fume and hydrogen sulfide will volatilize, forming a large amount of smoke with an unpleasant smell, which causes great harm to human health and seriously pollutes the environment. Therefore, it is necessary to further purify the tar processing tail gas.

[0003] The existing tar processing tail gas purification process is that the tar processing tail gas is directly connected to the fuel gas pipe orifice of the tubular furnace after being treated by a mist eliminator, and finally enters the burner of the tubular furnace to burn after being mixed with the fuel gas. However, due to the large amount of nitrogen in the tail gas and the possible mixing of a small amount of oxygen, there is a risk of combustion explosion in the tubular furnace, and the safety is low. At the same time, due to the unstable pressure of the tar processing tail gas, the combustion of the tubular furnace is likely to be unstable. Summary of the Invention

[0004] The utility model provides a new tar processing tail gas purification structure to solve the problems that the existing tar processing tail gas purification process is prone to combustion explosion and unstable combustion of the tubular furnace.

[0005] The utility model is realized by adopting the following technical scheme:

[0006] A tar processing tail gas purification structure includes:

[0007] An induced draft fan, which is equipped with a tail gas input pipeline and a tail gas output pipeline;

[0008] A water seal tank, which is provided with a top tail gas outlet and a circulating liquid inlet;

[0009] An oil separation tank, which is provided with a top gravity flow port, a top return port, an oil discharge port, a water replenishment port and a circulating liquid outlet;

[0010] A mist eliminator, which is provided with a mist elimination tail gas inlet, a mist elimination tail gas outlet and a bottom liquid outlet;

[0011] A tubular furnace, which is equipped with a fuel gas inlet and a combustion-supporting air inlet, and a combustion coil is arranged in the furnace body. The combustion coil is equipped with a tail gas inlet and a burner is arranged on the combustion coil;

[0012] A vertically arranged overflow pipe, whose top port is located in the water seal tank, and whose bottom port extends into the oil separation tank through the top return port of the oil separation tank;

[0013] The port of the tail gas output pipeline of the induced draft fan extends into the water seal tank and is arranged below the top port of the overflow pipe. The circulating liquid inlet of the water seal tank is communicated with the circulating liquid outlet of the oil separation tank through a pipeline and a circulating pump. The top tail gas outlet of the water seal tank is communicated with the fog-catching tail gas inlet of the mist eliminator. The bottom liquid outlet of the mist eliminator is communicated with the top self-flow port of the oil separation tank. The fog-catching tail gas outlet of the mist eliminator is communicated with the tail gas inlet on the combustion coil in the tubular furnace through a combustion pipe.

[0014] Working principle: During use, the tail gas input pipeline of the induced draft fan is communicated with the tail gas outlet of the tar processing in the previous process. The functions of the water seal tank and the oil separation tank are to maintain the tail gas pressure within a set pressure range (it is well known to those skilled in the art that the tail gas pressure is usually greater than the pressure inside the furnace body of the tubular furnace, and at the same time, the tail gas pressure is determined by the height of the port of the tail gas output pipeline of the induced draft fan from the water seal liquid level in the water seal tank), keep the combustion in the tubular furnace stable, and thus maintain the normal and stable operation of the entire tar processing production system; the tail gas passes through the water seal tank and then through the mist eliminator and is directly burned by the flame in the tubular furnace, thereby reducing the risk of explosion in the tubular furnace.

[0015] Further, an oxygen analyzer is arranged on the tail gas output pipeline of the induced draft fan, a cut-off valve and a blow-off pipe port are arranged on the combustion pipe, and a blow-off valve is arranged on the blow-off pipe port. When the oxygen analyzer detects that the oxygen content in the tail gas exceeds the standard, the cut-off valve is closed and the blow-off valve is opened to allow the tail gas to be emergently discharged through the blow-off pipeline to ensure safe production.

[0016] Further, a pressure gauge and a thermometer are also arranged on the combustion pipe. When it is monitored that the pressure or temperature on the combustion pipe exceeds the set value, the cut-off valve is closed and the blow-off valve is opened to allow the tail gas to be emergently discharged through the blow-off pipeline to further ensure safe and stable production.

[0017] Further, a flame arrester is also arranged on the combustion pipe, which further guarantees safe production.

[0018] Further, there are multiple burner nozzles on the combustion coil. The burner nozzles are evenly distributed on the combustion coil.

[0019] The beneficial effects produced by the present utility model are as follows: The tar processing tail gas purification structure described in the present utility model ensures the safe and stable combustion of the tubular furnace by directly introducing the tail gas into the tubular furnace to be burned by the flame and through the settings of the water seal tank, the oil separation tank, the oxygen analyzer, the pressure gauge, the thermometer, the cut-off valve, and the blow-off valve, thereby ensuring the normal purification treatment of the tar processing tail gas and further guaranteeing the safe and stable production of tar processing. Description of the Drawings

[0020] The drawings here are incorporated into the description and form a part of this description, showing the embodiments in line with the present utility model and used together with the description to explain the principle of the present utility model.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] In the figure: 1 - induced draft fan, 2 - oxygen analyzer, 3 - mist eliminator, 4 - cut-off valve, 5 - pressure gauge, 6 - flame arrester, 7 - water seal tank, 8 - circulation pump, 9 - tubular furnace, 10 - burner, 11 - relief valve, 12 - oil separation tank, 13 - thermometer, 14 - overflow pipe, 15 - tail gas output pipeline, 16 - tail gas input pipeline, 17 - combustion tube, 18 - relief pipe orifice. Specific embodiments

[0024] In order to more clearly understand the above objects, features and advantages of the present invention, the following will further describe the solutions of the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0026] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] The following will detail the specific embodiments of the present invention with reference to the drawings.

[0028] As Figure 1 shown, a tar processing tail gas purification structure includes:

[0029] An induced draft fan 1, which is equipped with a tail gas input pipeline 16 and a tail gas output pipeline 15;

[0030] A water seal tank 7, which is provided with a top tail gas outlet and a circulating liquid inlet;

[0031] An oil separation tank 12, which is provided with a top gravity flow port, a top reflux port, an oil discharge port, a water replenishment port, and a circulating liquid outlet;

[0032] A mist eliminator 3, which is provided with a mist capture tail gas inlet, a mist capture tail gas outlet, and a bottom liquid outlet;

[0033] A tubular furnace 9, which is equipped with a fuel gas inlet and a combustion air inlet, and a combustion coil is arranged in the furnace body. The combustion coil is provided with a tail gas inlet and a burner 10 is arranged on the combustion coil;

[0034] A vertically arranged overflow pipe 14, whose top port is located in the water seal tank 7, and whose bottom port extends into the oil separation tank 12 through the top reflux port of the oil separation tank 12;

[0035] The port of the tail gas output pipe 15 of the induced draft fan 1 extends into the water seal tank 7 and is arranged lower than the top port of the overflow pipe 14. The circulating liquid inlet of the water seal tank 7 is communicated with the circulating liquid outlet of the oil separation tank 12 through a pipe and a circulating pump 8. The top tail gas outlet of the water seal tank 7 is communicated with the mist capture tail gas inlet of the mist eliminator 3. The bottom liquid outlet of the mist eliminator 3 is communicated with the top gravity flow port of the oil separation tank 12. The mist capture tail gas outlet of the mist eliminator 3 is communicated with the tail gas inlet on the combustion coil in the tubular furnace 9 through a combustion pipe 17.

[0036] Working principle: During use, the tail gas input pipe of the induced draft fan 1 is communicated with the tar processing tail gas outlet of the previous process. The functions of the water seal tank 7 and the oil separation tank 12 are to maintain the tail gas pressure within a set pressure range (it is well known to those skilled in the art that the tail gas pressure is usually greater than the pressure inside the furnace body of the tubular furnace 9, and at the same time, the tail gas pressure is determined by the height of the port of the tail gas output pipe 15 of the induced draft fan 1 from the water seal liquid level in the water seal tank 7), keep the combustion in the tubular furnace 9 stable, and thus keep the normal and stable operation of the entire tar processing production system; the tail gas passes through the water seal tank 7 and then through the mist eliminator 3 and is directly burned by the flame in the tubular furnace 9, thereby reducing the risk of explosion of the tubular furnace 9.

[0037] During specific implementation, an oxygen analyzer 2 is arranged on the tail gas output pipe 15 of the induced draft fan 1, a cut-off valve 4 and a blow-off pipe port 18 are arranged on the combustion pipe 17, and a blow-off valve 11 is arranged on the blow-off pipe port 18. When the oxygen analyzer 2 detects that the oxygen content in the tail gas exceeds the standard, the cut-off valve 4 is closed and the blow-off valve 11 is opened to allow the tail gas to be discharged emergently through the blow-off pipe to ensure safe production.

[0038] During specific implementation, a pressure gauge 5 and a thermometer 13 are also arranged on the combustion pipe 17. When it is monitored that the pressure or temperature on the combustion pipe 17 exceeds the set value, the cut-off valve 4 is closed and the blow-off valve 11 is opened to allow the tail gas to be discharged emergently through the blow-off pipe to further ensure safe and stable production.

[0039] In specific implementation, a flame arrester 6 is also provided on the combustion tube 17, further ensuring safe production.

[0040] In this specific implementation manner, a plurality of burner nozzles 10 are provided on the combustion coil. The burner nozzles 10 are evenly distributed on the combustion coil.

[0041] The above are only specific implementation manners of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Although the foregoing embodiments have been described in detail, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A tar processing tail gas purification structure, characterized in that: include: An induced draft fan (1) is provided with an exhaust gas input pipe (16) and an exhaust gas output pipe (15); A water seal tank (7) having a top tail gas outlet and a circulating liquid inlet; A grease trap (12) having a top gravity outlet, a top return outlet, an oil discharge outlet, a water supply outlet, and a circulating fluid outlet; A mist collector (3) is provided with a mist-collecting tail gas inlet, a mist-collecting tail gas outlet, and a bottom liquid outlet; A tubular furnace (9) having a fuel gas inlet and a combustion air inlet, a combustion coil arranged in the furnace body, an exhaust gas inlet arranged in the combustion coil, and a burner (10) arranged on the combustion coil; A vertically arranged overflow pipe (14), the top end of which is located in the water seal groove (7), and the bottom end of which extends into the grease trap (12) through the top return port of the grease trap (12); The end of the exhaust gas output pipe (15) of the induced draft fan (1) extends into the water seal tank (7) and is arranged below the top end of the overflow pipe (14). The circulating liquid inlet of the water seal tank (7) is connected to the circulating liquid outlet of the grease trap (12) through a pipe and a circulating pump (8). The top exhaust gas outlet of the water seal tank (7) is connected to the mist-catching exhaust gas inlet of the mist collector (3). The bottom liquid outlet of the mist collector (3) is connected to the top gravity outlet of the grease trap (12). The mist-catching exhaust gas outlet of the mist collector (3) is connected to the exhaust gas inlet on the combustion coil in the tubular furnace (9) through a combustion pipe (17).

2. A tar processing tail gas purification structure according to claim 1, characterized in that: An oxygen meter (2) is provided on the exhaust gas output pipe (15) of the induced draft fan (1), a cut-off valve (4) and a discharge pipe opening (18) are provided on the combustion pipe (17), and a discharge valve (11) is provided on the discharge pipe opening (18).

3. A tar processing tail gas purification structure according to claim 2, characterized in that: The combustion tube (17) is also provided with a pressure gauge (5) and a temperature gauge (13).

4. A tar processing tail gas purification structure according to claim 3, characterized in that: The combustion tube (17) is also provided with a flame arrester (6).

5. A tar processing tail gas purification structure according to claim 4, characterized in that: A plurality of burner nozzles (10) are provided on the combustion coil.

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