HCN waste gas combustion furnace

Abstract

The utility model discloses an HCN waste gas combustion furnace which comprises a furnace body, a gas inlet pipe and a first supporting frame, the furnace body is arranged on the first supporting frame, the gas inlet pipe is arranged at the top end of the furnace body, the HCN waste gas combustion furnace further comprises a combustion mechanism and a catalytic treatment mechanism, the combustion mechanism is arranged in the furnace body, and the catalytic treatment mechanism is arranged on the outer right side of the furnace body; according to the HCN waste gas combustion furnace, through cooperation of a heat exchanger and a thermocouple, the temperature of gas exhausted into a catalytic furnace is controlled, the working environment of a first metal catalyst and a second metal catalyst is adjusted through the temperature of the gas, and therefore energy is saved, and the activity of the first metal catalyst and the activity of the second metal catalyst are improved through the temperature range; therefore, the speed of chemical reaction is remarkably increased, residual waste gas in the gas is further treated, and environmental protection is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion furnaces, in particular to an HCN waste gas combustion furnace. Background Art

[0002] Carbonization is an important process in the production of carbon fibers. During this process, the precursor fibers undergo pyrolysis and polycondensation reactions in a nitrogen atmosphere. When producing polyacrylonitrile (PAN)-based carbon fibers, waste gases such as HCN are generated.

[0003] HCN is one of the extremely typical unconventional toxic and harmful pollutants in industrial waste gases. Moreover, HCN gas has high toxicity, is volatile, and has strong diffusibility. It must be treated to meet the standards before being discharged. Currently, the commonly used method for treating HCN carbonization waste gas in the industry is incineration.

[0004] The efficiency of directly burning hydrogen cyanide waste gas is usually relatively high, but the specific efficiency is affected by various factors. Under ideal conditions, when the combustion temperature is high enough, the combustion time is sufficient, and the combustion process is stable, the treatment efficiency of directly burning hydrogen cyanide waste gas can reach more than 95%-99%. However, in actual combustion, the residence time of the waste gas in the combustion area is insufficient, which causes some hydrogen cyanide not to react in time. Secondly, there are other gases in the HCN waste gas, which may compete with hydrogen cyanide for oxygen or affect the combustion reaction, thus affecting the treatment efficiency. Moreover, the performance of the combustion equipment also affects the efficiency, resulting in incomplete treatment of HCN waste gas and difficulty in meeting the emission standards. In the prior art, metal catalysts are often used to assist adsorption to improve the waste gas treatment effect. However, the metal catalysts are directly set in the combustion furnace, making it difficult to control the temperature at which the metal catalysts are located. The high temperature of the combustion method (usually at 800-1100°C) is likely to cause the metal catalysts to deactivate.

[0005] Therefore, the utility model provides an HCN waste gas combustion furnace to solve the above problems. Content of the Utility Model

[0006] In view of the deficiencies of the prior art, the utility model provides an HCN waste gas combustion furnace to solve the above problems.

[0007] To achieve the above objectives, the utility model is realized through the following technical solutions: an HCN waste gas combustion furnace, including a furnace body, an air inlet pipe, and a first support frame. The furnace body is arranged on the first support frame, the air inlet pipe is arranged at the top of the furnace body, and further includes a combustion mechanism and a catalytic treatment mechanism. The combustion mechanism is arranged inside the furnace body, and the catalytic treatment mechanism is arranged on the right side outside the furnace body.

[0008] Preferably, a first fixing plate, a second fixing plate, a third fixing plate and a fireproof plate are sequentially arranged inside the furnace body. The inside of the furnace body is divided into four chambers by the first fixing plate, the second fixing plate, the third fixing plate and the fireproof plate. The upper side of the first fixing plate is the first chamber, the second chamber is between the first fixing plate and the second fixing plate, the third chamber is between the second fixing plate and the third fixing plate, and the lower side of the fireproof plate is the fourth chamber.

[0009] Preferably, the combustion mechanism includes a thin pipe, which is arranged inside the furnace body. The thin pipe is sequentially communicated with the first fixing plate, the second fixing plate, the third fixing plate and the fireproof plate. A jet port is arranged at the bottom end of the fireproof plate, and arc-shaped grooves are arranged on the first fixing plate, the second fixing plate and the third fixing plate.

[0010] Preferably, a burner is arranged outside the furnace body, a flame spraying port is arranged inside the fourth chamber, a reaction chamber is arranged at the bottom end of the furnace body, a first pipe is communicated with the side wall of the reaction chamber, and one end of the first pipe far away from the reaction chamber is communicated with the side wall of the furnace body and the other end of the first pipe far away from the reaction chamber is communicated with the third chamber.

[0011] Preferably, the catalytic treatment mechanism includes a second pipe, one end of which is communicated with the furnace body and the other end of which is communicated with the first chamber. The other end of the second pipe far away from the furnace body is communicated with a heat exchanger, and the other side of the heat exchanger far away from the second pipe is communicated with a third pipe, and the other end of the third pipe far away from the heat exchanger is communicated with a catalytic furnace.

[0012] Preferably, a second support frame is fixedly connected to the lower side of the catalytic furnace, and a thermocouple is arranged at the bottom end inside the catalytic furnace.

[0013] Preferably, a first metal catalyst and a second metal catalyst are arranged inside the catalytic furnace, and an air outlet pipe is arranged on the catalytic furnace.

[0014] Advantageous Effects

[0015] The present utility model provides a HCN waste gas combustion furnace. Compared with the prior art, the following advantageous effects are achieved:

[0016] (1) In a HCN waste gas combustion furnace, by the cooperation of a heat exchanger and a thermocouple, the temperature of the gas discharged into the catalytic furnace is controlled, and the working environment of the first metal catalyst and the second metal catalyst is adjusted by using the temperature of the gas, so as to save energy. Then, the activity of the first metal catalyst and the second metal catalyst is increased by using the temperature range, thereby significantly accelerating the chemical reaction speed, further treating the residual waste gas in the gas, and being beneficial to environmental protection.

[0017] (2) An HCN waste gas combustion furnace, through the cooperation of a first fixing plate, a second fixing plate, a third fixing plate and a thin pipe inside the furnace body, makes use of the notch positions set on the first fixing plate, the second fixing plate and the third fixing plate, so that the gas flow presents an S shape. By contacting the thin pipe, the waste gas in the thin pipe is heat-exchanged to heat the waste gas, thereby improving the combustion efficiency of the subsequent combustion of the waste gas. Description of the Drawings

[0018] Figure 1 is the overall structure diagram of the present utility model;

[0019] Figure 2 is the internal structure diagram of the catalytic furnace of the present utility model;

[0020] Figure 3 is the side view of the burner structure of the present utility model;

[0021] Figure 4 is the internal structure diagram of the burner of the present utility model;

[0022] Figure 5 is the partial internal structure diagram of the burner of the present utility model.

[0023] In the figure, 1 is the furnace body; 2 is the intake pipe; 3 is the first support frame;

[0024] Combustion mechanism: 41 is the first fixing plate; 42 is the second fixing plate; 43 is the third fixing plate; 44 is the fireproof plate; 45 is the thin pipe; 46 is the first pipe; 47 is the burner; 48 is the jet orifice; 49 is the flame outlet; 491 is the reaction chamber;

[0025] Catalytic treatment mechanism: 51 is the second pipe; 52 is the heat exchanger; 53 is the catalytic furnace; 54 is the thermocouple; 55 is the first metal catalyst; 56 is the second metal catalyst; 57 is the outlet pipe; 58 is the second support frame; 59 is the third pipe. Specific Embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Embodiment 1:

[0028] Please refer to Figures 1-5, An HCN waste gas combustion furnace, comprising a furnace body 1, an intake pipe 2 and a first support frame 3. The furnace body 1 is arranged on the first support frame 3, and the intake pipe 2 is arranged at the top of the furnace body 1. It further includes a combustion mechanism and a catalytic treatment mechanism. The combustion mechanism is arranged inside the furnace body 1, and the catalytic treatment mechanism is arranged on the right side outside the furnace body 1.

[0029] Inside the furnace body 1, a first fixed plate 41, a second fixed plate 42, a third fixed plate 43 and a fireproof plate 44 are successively arranged. The inside of the furnace body 1 is divided into four chambers by the first fixed plate 41, the second fixed plate 42, the third fixed plate 43 and the fireproof plate 44. The upper side of the first fixed plate 41 is the first chamber, the space between the first fixed plate 41 and the second fixed plate 42 is the second chamber, the space between the second fixed plate 42 and the third fixed plate 43 is the third chamber, and the lower side of the fireproof plate 44 is the fourth chamber.

[0030] The combustion mechanism includes a fine pipe 45. The fine pipe 45 is arranged inside the furnace body 1 and is successively communicated with the first fixed plate 41, the second fixed plate 42, the third fixed plate 43 and the fireproof plate 44. A jet orifice 48 is arranged at the bottom end of the fireproof plate 44, and the first fixed plate 41, the second fixed plate 42 and the third fixed plate 43 are provided with arc-shaped grooves.

[0031] A burner 47 is arranged outside the furnace body 1, a spout 49 is arranged inside the fourth chamber, a reaction chamber 491 is arranged at the bottom end of the furnace body 1, a first pipe 46 is communicated with the side wall of the reaction chamber 491, and one end of the first pipe 46 far away from the reaction chamber 491 is communicated with the side wall of the furnace body 1 and is communicated to the third chamber.

[0032] Working process: HCN waste gas is introduced through the intake pipe 2. The HCN waste gas passes through the second chamber and the third chamber successively through the fine pipe 45, and then is discharged into the fourth chamber through the jet orifice 48. The burner 47 is started, and flames are ejected from the spout 49 to completely burn the HCN waste gas. After the HCN waste gas is burned, the treated gas flows into the reaction chamber 491. After the gas reacts in the reaction chamber 491, it flows through the first pipe 46 to the third chamber. Since the treated gas has a high temperature after combustion and expands and contracts due to heat, the gas moves upward. As a result, the gas passes through the third chamber and the second chamber successively. Through the notch positions provided by the first fixed plate 41, the second fixed plate 42 and the third fixed plate 43, the treated gas flows in an S shape, and the treated gas continuously contacts the fine pipe 45, so that the treated gas exchanges heat with the HCN waste gas in the fine pipe 45, preheating the HCN waste gas to be burned and improving its reaction activity, which is helpful for the subsequent combustion process.

[0033] Embodiment Two:

[0034] Please refer to Figures 1-5, on the basis of the first embodiment, this embodiment provides a technical solution for an HCN waste gas combustion furnace: The catalytic treatment mechanism includes a second pipeline 51. One end of the second pipeline 51 is connected to the furnace body 1, and one end of the second pipeline 51 communicates with the first chamber. The end of the second pipeline 51 away from the furnace body 1 is connected to a heat exchanger 52. The side of the heat exchanger 52 away from the second pipeline 51 is connected to a third pipeline 59. The end of the third pipeline 59 away from the heat exchanger 52 is connected to a catalytic furnace 53.

[0035] A second support frame 58 is fixedly connected to the lower side of the catalytic furnace 53, and a thermocouple 54 is arranged at the bottom end inside the catalytic furnace 53.

[0036] A first metal catalyst 55 and a second metal catalyst 56 are arranged inside the catalytic furnace 53, and an air outlet pipe 57 is arranged on the catalytic furnace 53.

[0037] Working process: The gas in the first chamber passes through the second pipeline 51 and is discharged into the heat exchanger 52. After heat exchange in the heat exchanger 52, the temperature of the gas is reduced. Through the detection of the gas temperature by the thermocouple 54, and by controlling the flow rate of the refrigerant in the heat exchanger 52, the temperature of the gas after heat exchange in the heat exchanger 52 is controlled. The gas is discharged into the catalytic furnace 53 through the third pipeline 59. The gas passes through the first metal catalyst 55 and the second metal catalyst 56, and under the action of the catalyst, the treatment speed of the residual waste gas in the gas is accelerated, and the harmful substances in the waste gas are removed to the greatest extent.

[0038] At the same time, the content not described in detail in this specification belongs to the prior art well known to those skilled in the art.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An HCN waste gas combustion furnace, comprising a furnace body (1), an air inlet pipe (2) and a first support frame (3), wherein the furnace body (1) is arranged on the first support frame (3), and the air inlet pipe (2) is arranged at the top of the furnace body (1), characterized in that: The furnace body (1) further comprises a combustion mechanism and a catalytic treatment mechanism, wherein the combustion mechanism is arranged inside the furnace body (1), and the catalytic treatment mechanism is arranged outside the furnace body (1) on the right side. The furnace body (1) is provided with a first fixing plate (41), a second fixing plate (42), a third fixing plate (43) and a fireproof plate (44) in sequence. The furnace body (1) is divided into four chambers by the first fixing plate (41), the second fixing plate (42), the third fixing plate (43) and the fireproof plate (44). The upper side of the first fixing plate (41) is a first chamber, and the space between the first fixing plate (41) and the second fixing plate (42) is a first chamber. The second chamber is between the second fixing plate (42) and the third fixing plate (43), the third chamber is between the second fixing plate (42) and the third fixing plate (43), the fourth chamber is below the fireproof plate (44), the combustion mechanism comprises a thin pipe (45), the thin pipe (45) is arranged in the furnace body (1), the thin pipe (45) is connected with the first fixing plate (41), the second fixing plate (42), the third fixing plate (43) and the fireproof plate (44) in sequence, the fireproof plate (44) is provided with an air injection port (48) at the bottom end, and the first fixing plate (41), the second fixing plate (42) and the third fixing plate (43) are provided with arc grooves.

2. The HCN waste gas combustion furnace according to claim 1, characterized in that: A burner (47) is arranged on the outside of the furnace body (1), a flame nozzle (49) is arranged in the fourth chamber, a reaction chamber (491) is arranged at the bottom end of the furnace body (1), a side wall of the reaction chamber (491) is connected to a first pipe (46), an end of the first pipe (46) away from the reaction chamber (491) is connected to the side wall of the furnace body (1), and an end of the first pipe (46) away from the reaction chamber (491) is connected to the third chamber.

3. The HCN waste gas combustion furnace according to claim 2, characterized in that: The catalytic treatment mechanism comprises a second pipe (51), one end of the second pipe (51) is connected to the furnace body (1), one end of the second pipe (51) is connected to the first chamber, one end of the second pipe (51) away from the furnace body (1) is connected to a heat exchanger (52), one side of the heat exchanger (52) away from the second pipe (51) is connected to a third pipe (59), and one end of the third pipe (59) away from the heat exchanger (52) is connected to a catalytic furnace (53).

4. The HCN waste gas combustion furnace according to claim 3, characterized in that: A second support frame (58) is fixedly connected to the lower side of the catalytic furnace (53), and a thermocouple (54) is arranged at the bottom end of the interior of the catalytic furnace (53).

5. The HCN waste gas combustion furnace according to claim 4, characterized in that: A first metal catalyst (55) and a second metal catalyst (56) are arranged inside the catalytic furnace (53), and an air outlet pipe (57) is arranged on the catalytic furnace (53).

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