Feeding system of tubular furnace

Abstract

The utility model belongs to the technical field of waste gas combustion treatment, and particularly relates to a tubular furnace feeding system. Comprising a tubular furnace, the tubular furnace comprises a combustion chamber and a circulating hot air feeding pipe, an air inlet chamber is arranged in the center of the bottom wall of the combustion chamber, and the combustion chamber communicates with the air inlet chamber; a connecting pipe is arranged on the side wall of the air inlet chamber, a sleeve is connected to the end, away from the air inlet chamber, of the connecting pipe, one end of the circulating hot air feeding pipe is arranged in the sleeve in a sleeved mode and extends into the connecting pipe, the end, away from the connecting pipe, of the sleeve and the side wall of the circulating hot air feeding pipe are arranged in a sealed mode, and a tail gas feeding pipe is connected to the side wall, away from the connecting pipe, of the sleeve. Tail gas is not heated by circulating hot air in front of the connecting pipe in advance, so that burning loss of the connecting pipe due to high temperature caused by burning and tempering of the tail gas in front of the air inlet chamber is avoided, and potential safety hazards such as deflagration are also avoided. And meanwhile, the tail gas and the circulating hot air are mixed in the air inlet chamber, so that the tail gas is burnt more sufficiently in the furnace.

Description

TECHNICAL FIELD

[0001] The utility model belongs to waste gas combustion treatment technical field, concretely relates to a tubular furnace feeding system. BACKGROUND

[0002] The organic tail gas generated by coking and tar deep processing enterprises is usually introduced into a washing tower, and then discharged after being washed by washing oil spray. By this method, part of the organic matter in the tail gas can be adsorbed into the washing oil, but the tail gas discharged from the washing tower still contains organic matter, and the washing process is not complete, which still pollutes the environment. In recent years, coking and tar deep processing enterprises have begun to consider using high-temperature thermal oxidation to treat this part of organic tail gas. A tubular furnace is used in the plant, which is a device that burns fuel gas to produce a flame to provide heat to the process medium. The tubular furnace uses the high temperature and high heat of the flame to incinerate the organic tail gas and convert it into CO2 and H2O for discharge. In actual production, the tubular furnace feeding system includes a fuel gas feeding pipe, a circulating hot air feeding pipe, and a tail gas feeding pipe. Among them, the tail gas feeding pipe and the circulating hot air feeding pipe are usually combined before the gas inlet chamber. The mixed circulating hot air and tail gas are sent into the gas inlet chamber through the connecting pipe. At this time, the tail gas is heated by the circulating hot air before the connecting pipe, the temperature rises and becomes flammable, and combustion often occurs before the gas inlet chamber, which causes backfire, resulting in high temperature of the connecting pipe, and in severe cases, the connecting pipe is burned and damaged, and there are safety hazards such as deflagration. SUMMARY

[0003] Therefore, the present application provides a tubular furnace feeding system to solve the technical problem that the tail gas is heated by the circulating hot air before the connecting pipe in the prior art, combustion occurs before the gas inlet chamber, which causes backfire, resulting in high temperature of the connecting pipe, and in severe cases, the connecting pipe is burned and damaged, and there are safety hazards such as deflagration.

[0004] The technical solution of the present application to solve the above technical problems is as follows:

[0005] A tubular furnace feeding system, comprising: a tubular furnace, the tubular furnace comprising a combustion chamber and a circulating hot air feeding pipe, a gas inlet chamber is arranged at the center of the bottom wall of the combustion chamber, and the combustion chamber and the gas inlet chamber are in communication with each other; a connecting pipe is arranged on the side wall of the gas inlet chamber, one end of the connecting pipe away from the gas inlet chamber is connected with a sleeve, one end of the circulating hot air feeding pipe is sleeved in the sleeve, and extends into the connecting pipe, the end of the sleeve away from the connecting pipe is sealingly arranged with the side wall of the circulating hot air feeding pipe, and the side wall of the sleeve away from the connecting pipe is connected with a tail gas feeding pipe.

[0006] Preferably, in the above-mentioned tubular furnace feeding system, the diameter of the circulating hot air feeding pipe is 0.5 to 0.8 times the diameter of the sleeve.

[0007] Preferably, the above-mentioned tubular furnace feeding system, the circulating hot air feeding pipe is concentrically sleeved in the sleeve pipe.

[0008] Preferably, the above-mentioned tubular furnace feeding system, the sleeve pipe is a tapered pipe with gradually reduced diameter along the air flow direction.

[0009] Preferably, the above-mentioned tubular furnace feeding system, a first flow regulating valve is arranged on the connecting pipe, one end of the circulating hot air feeding pipe extends to the first flow regulating valve, and the distance between the two is greater than 5 cm.

[0010] Preferably, the above-mentioned tubular furnace feeding system, the circulating hot air feeding pipe is further connected with a circulating hot air pressurizing device for pressurizing the circulating hot air, and a second flow regulating valve is arranged at the outlet of the circulating hot air pressurizing device.

[0011] Preferably, the above-mentioned tubular furnace feeding system, the tail gas feeding pipe is further connected with a tail gas pressurizing device for pressurizing the tail gas, and a third flow regulating valve is arranged at the outlet of the tail gas pressurizing device.

[0012] Preferably, the above-mentioned tubular furnace feeding system further comprises a fuel gas feeding pipe, one end of the fuel gas feeding pipe penetrates into and passes through the air inlet chamber from the bottom wall of the air inlet chamber, and extends to the combustion chamber.

[0013] Preferably, the above-mentioned tubular furnace feeding system further comprises a combustion-supporting gas feeding pipe, one end of the combustion-supporting gas feeding pipe penetrates into the air inlet chamber from the side wall of the air inlet chamber, so as to introduce part of the combustion-supporting gas into the combustion chamber.

[0014] Compared with the prior art, the present application has at least the following advantages:

[0015] The present application provides a tubular furnace feeding system, comprising a tubular furnace, the tubular furnace comprising a combustion chamber and a circulating hot air feeding pipe, a bottom wall of the combustion chamber is provided with an air inlet chamber at the center, the combustion chamber and the air inlet chamber are in communication with each other; a connecting pipe is arranged on the side wall of the air inlet chamber, one end of the connecting pipe is connected with a sleeve pipe, one end of the circulating hot air feeding pipe is sleeved in the sleeve pipe and extends into the connecting pipe, the end of the sleeve pipe away from the connecting pipe is sealingly arranged with the side wall of the circulating hot air feeding pipe, and a tail gas feeding pipe is connected with the side wall of the sleeve pipe away from the connecting pipe. The circulating hot air feeding pipe is wrapped in the sleeve pipe and extends into the connecting pipe, so that the tail gas is separated from the circulating hot air, the tail gas is not heated in advance by the circulating hot air before the connecting pipe, thereby avoiding the combustion of the tail gas before the air inlet chamber and the occurrence of backfire causing the high-temperature connecting pipe to be burned and damaged, and avoiding the safety hazards such as deflagration. At the same time, the tail gas and the circulating hot air are mixed in the air inlet chamber, and the thermal efficiency of the tubular furnace is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 Figure 1 is a schematic diagram of a tube furnace feed system structure according to the present application.

[0017] Fig. 2 Figure 2 is a partial cross-sectional view of a sleeve.

[0018] Figure 1 is a schematic diagram of a tube furnace feed system structure according to the present application. DETAILED DESCRIPTION

[0019] For the purpose of the present application, the application will be described in greater detail by referring to the attached drawings in which preferred embodiments of the application are shown. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0020] It is to be understood that where an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. As used herein, the terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end", and the like as well as like terms are used for description only and not to limit the embodiments of the present application.

[0021] 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 application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0022] Referring to the drawings Figs. 1-2In one specific embodiment of the present application, the tubular furnace 100 comprises a combustion chamber 110 and a circulating hot air feeding pipe 400, the bottom wall of the combustion chamber 110 is provided with an air inlet chamber 120, and the combustion chamber 110 and the air inlet chamber 120 are in communication with each other; the side wall of the air inlet chamber 120 is provided with a connecting pipe 200, one end of the connecting pipe 200 away from the air inlet chamber 120 is connected with a sleeve pipe 300, one end of the circulating hot air feeding pipe 400 is sleeved on the sleeve pipe 300 and extends into the connecting pipe 200, and the end of the sleeve pipe 300 away from the connecting pipe 200 is sealingly provided with the side wall of the circulating hot air feeding pipe 400, and the side wall of the sleeve pipe 300 away from the connecting pipe 200 is connected with a tail gas feeding pipe 500.

[0023] In the present system, the tubular furnace 100 burns the organic tail gas by using the high temperature and high heat of the flame, and converts the tail gas into CO2 and H2O which are discharged, and the tail gas enters the air inlet chamber 120 through the tail gas feeding pipe 500 and then is introduced into the combustion chamber 110 for complete combustion and decomposition. In this process, in order to make the burning of the tail gas in the furnace more complete, circulating hot air needs to be introduced, and the circulating hot air enters the air inlet chamber 120 through the circulating hot air feeding pipe. The circulating hot air feeding pipe 400 extends into the sleeve pipe 300 and is wrapped in the sleeve pipe 300, and there is a certain interval space, that is, a cavity, between the circulating hot air feeding pipe 400 and the sleeve pipe 300, and the tail gas feeding pipe 500 is arranged on the side wall of the sleeve pipe 300, so that the tail gas can be sent into the air inlet chamber 120 through the cavity. The tail gas and the circulating hot air are mixed only when they enter the air inlet chamber 120, which ensures that the circulating hot air heats the tail gas to make the burning of the tail gas in the furnace more complete. More importantly, this structure separates the tail gas and the circulating hot air, which can prevent the tail gas from being heated by the circulating hot air in advance before the connecting pipe 200, thereby avoiding the burning of the tail gas before the air inlet chamber 120 and the occurrence of backfire which causes the high-temperature connecting pipe 200 to be burned and damaged, and also avoiding the safety hazards such as deflagration.

[0024] Since the tail gas is sent into the air inlet chamber 120 through the cavity formed between the circulating hot air feeding pipe 400 and the sleeve pipe 300, in order to make the tail gas have enough flow space, further, the diameter of the circulating hot air feeding pipe 400 is 0.5 to 0.8 times the diameter of the sleeve pipe 300, if the diameter of the circulating hot air feeding pipe 400 is too small, the flow rate of the pipe is too large and the air pressure is enhanced, which is not conducive to the stability of the system; if the diameter of the circulating hot air feeding pipe 400 is too large, the interval between the sleeve pipe 300 and the circulating hot air feeding pipe 400 is too small, and the tail gas cannot flow normally, which leads to that when the concentration of the tail gas entering the combustion chamber 110 is too low, the released heat is very small and is not enough to decompose the large molecular substances in the tail gas, thereby causing incomplete combustion. Therefore, the diameter of the circulating hot air feeding pipe 400 = (0.5 to 0.8) x the diameter of the sleeve pipe 300, which can make the circulating hot air and the tail gas maintain a reasonable flow rate and pressure that meet the normal production operation.

[0025] Further, in order to make the exhaust gas flow uniformly in the sleeve 300, the circulating hot air feeding pipe 400 is concentrically sleeved with the sleeve 300.

[0026] At the same time, in order to make the exhaust gas flow smoothly into the air inlet chamber 120 in the sleeve 300, as a preferred, the circulating hot air feeding pipe 400 is a tapered pipe in the sleeve 300 along the direction of the gas flow. The circulating hot air feeding pipe 400 is a tapered pipe in the sleeve 300, which means that the flow channel of the exhaust gas is gradually widened at the joint. Since the flow channel is reduced when the exhaust gas enters the sleeve 300 from the exhaust gas feeding pipe 500, the exhaust gas is compressed and the concentration is increased at the intersection of the exhaust gas feeding pipe 500 and the sleeve 300. The over-concentration of the exhaust gas causes the risk of deflagration and backfire in the pipeline. The flow channel of the exhaust gas is gradually widened at the joint, the pressure in the pipeline is reduced, and the concentration of the exhaust gas is gradually reduced compared to the intersection of the exhaust gas feeding pipe 500 and the sleeve 300. Finally, the exhaust gas is sent into the combustion chamber 110 at a suitable concentration.

[0027] If the outlet of the circulating hot air feeding pipe 400 is in the sleeve 300, the exhaust gas in the sleeve 300 will be heated by the circulating hot air, and there is still a risk of combustion and backfire. Therefore, further, the connecting pipe 200 is provided with a first flow regulating valve 210, one end of the circulating hot air feeding pipe 400 extends to the first flow regulating valve 210, and the distance between them is greater than 5 cm. One end of the circulating hot air feeding pipe 400 directly extends to the first flow regulating valve 210 in the connecting pipe 200, and has a certain distance from the first flow regulating valve 210. On the one hand, it does not affect the normal opening and closing of the valve, and on the other hand, it makes one end of the circulating hot air feeding pipe 400 as close as possible to the air inlet chamber 120. The circulating hot air is directly sent into the combustion chamber 110 through the air inlet chamber 120. This not only makes the incineration of the exhaust gas in the furnace more sufficient, but also avoids high temperature at the feeding position of the connecting pipe 200.

[0028] Further, the circulating hot air feeding pipe 400 is also connected with a circulating hot air pressurizing device 410 for pressurizing the circulating hot air. The outlet of the circulating hot air pressurizing device 410 is provided with a second flow regulating valve 420, and the second flow regulating valve 420 adjusts the flow of the circulating hot air according to the actual working condition.

[0029] Further, the exhaust gas feeding pipe 500 is also connected with an exhaust gas pressurizing device 510 for pressurizing the exhaust gas. The outlet of the exhaust gas pressurizing device 510 is provided with a third flow regulating valve 520, and the third flow regulating valve 520 adjusts the flow of the exhaust gas according to the actual working condition.

[0030] In another embodiment of the present application, a fuel gas feeding pipe 600 is provided, one end of which penetrates into the air inlet chamber 120 from the bottom wall of the air inlet chamber 120 and extends to the combustion chamber 110. The fuel gas feeding pipe is used to introduce fuel gas into the combustion chamber 110 for combustion, so that the high-temperature and high-heat tail gas of the combustion flame is used for incineration and decomposition, and is converted into CO2 and H2O for emission.

[0031] Further, one end of the combustion-supporting gas feeding pipe 700 penetrates into the air inlet chamber 120 from the side wall of the air inlet chamber 120, and is used to introduce part of the combustion-supporting gas into the combustion chamber 110. The combustion-supporting gas feeding pipe 700 is arranged outside the gas outlet end of the tail gas feeding pipe 500, which can promote the uniform mixing of the tail gas and the combustion-supporting gas, improve the combustion effect, and when the concentration of the waste gas is small, the gas curtain formed when the combustion-supporting gas flows through the gas outlet end of the tail gas feeding pipe 500 can effectively prevent the flame from flowing back.

[0032] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A tubular furnace feed system characterized by, The application relates to a tubular furnace, which comprises a combustion chamber and a circulating hot air feeding pipe. The diameter of the circulating hot air feeding pipe is 0.5-0.8 times the diameter of the sleeve pipe.

2. The tubular furnace feed system of claim 1, wherein, The circulating hot air feeding pipe is concentrically sleeved on the sleeve pipe.

3. The tubular furnace feed system of claim 2, wherein, The sleeve pipe is a tapered pipe with a gradually reduced diameter along the air flow direction.

4. The tubular furnace feed system of claim 2, wherein, A first flow regulating valve is arranged on the connecting pipe, and the one end of the circulating hot air feeding pipe extends to the first flow regulating valve, and the distance between the two is greater than 5 cm.

5. The tubular furnace feed system of claim 1, wherein, The circulating hot air feeding pipe is further connected with a circulating hot air pressurizing device for pressurizing the circulating hot air, and the outlet of the circulating hot air pressurizing device is provided with a second flow regulating valve.

6. The tubular furnace feed system of claim 1, wherein, The tail gas feeding pipe is further connected with a tail gas pressurizing device for pressurizing the tail gas, and the outlet of the tail gas pressurizing device is provided with a third flow regulating valve.

7. The tubular furnace feed system of claim 1, wherein, The application further comprises a fuel gas feeding pipe, one end of the fuel gas feeding pipe penetrates into the air inlet chamber from the bottom wall of the air inlet chamber and extends to the combustion chamber.

8. The tubular furnace feed system of claim 1, wherein, The application further comprises a combustion-supporting gas feeding pipe, one end of the combustion-supporting gas feeding pipe penetrates into the air inlet chamber from the side wall of the air inlet chamber, and is used for introducing part of the combustion-supporting gas into the combustion chamber.

9. The tubular furnace feed system of claim 1, wherein, ​

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