Acetylene carbon black preparation furnace cover, cracking furnace and preparation system

Abstract

The invention belongs to the technical field of acetylene carbon black preparation, and particularly relates to an acetylene carbon black preparation furnace cover, a cracking furnace and a preparation system.The acetylene carbon black preparation furnace cover comprises a cover body, an inner pipe and an air blowing pipe, an air inlet is formed in the cover body, and an outer pipe is arranged on the air inlet; the inner pipe comprises a nozzle and a sleeve arranged at one end of the nozzle in a sealed mode, the other end of the nozzle is inserted into the outer pipe, a 0.5 mm-2. 0mm channel is formed between the nozzle and the outer pipe, a purging opening is formed in one end of the channel and located in the end, away from the sleeve, of the nozzle, and the nozzle is connected with the outer pipe in a matched mode through a sealing piece. One end of the air blowing pipe penetrates through the outer pipe, and the air blowing pipe is communicated with the gas phase space of the channel. A scraper scraping mode is replaced by a mode of blowing off coke by introducing inert gas, so that the problems that the service life of a scraper is relatively short and the scraper is difficult to maintain after being damaged and deformed under a high-temperature condition are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of acetylene carbon black preparation, and particularly relates to an acetylene carbon black preparation furnace cover, a cracking furnace and a preparation system. Background Art

[0002] Acetylene carbon black is produced by the autothermal cracking of acetylene gas in an air-tight condition and belongs to thermal cracking carbon black. Thermal cracking carbon black refers to a method in which natural gas or acetylene gas is subjected to intermittent (i.e., combustion heat storage and thermal cracking in two stages) or continuous (single thermal cracking) thermal cracking to produce carbon black in a preheated reactor in an air-tight condition.

[0003] Usually, acetylene will undergo carbon black formation reaction and coking reaction in the cracking furnace. Generally, at higher temperatures (>927°C), acetylene generates carbon black and hydrogen through condensed ring intermediates; at lower temperatures (<927°C), acetylene forms coke through condensation; the inner tube of the cracking furnace is the most likely place to form coke; currently, physical scraping has been used in domestic and foreign industries to remove coke. For example, the Chinese utility model patent with publication number CN221005950U discloses a furnace cover device and a carbon black cracking reactor, specifically disclosing a furnace cover body cover arranged on the carbon black cracking reactor; the inner tube is arranged on the furnace cover The scraper part is arranged on the side of the inner tube, and the scraper part includes a scraper body and a sealing swing assembly, and the sealing swing assembly is sleeved on the scraper body to seal the scraper body and the furnace cover body; the sealing swing assembly includes a mounting base, a sleeve and a bearing, and the sealing swing assembly is arranged on the furnace cover body through the mounting base, and the sleeve is rotatably clamped on the mounting base, and the scraper body is inserted through the sleeve, and the bearing is sleeved on the sleeve. The scraper body can rotate relative to the mounting base through the sleeve and the bearing, and part of the scraper body can swing relative to the inner tube to scrape off the coke in the inner tube. The furnace cover device can ensure the sealing of the scraper body with the furnace cover body during the swinging process, and ensure that the carbon black cracking reactor is always in an environment isolated from oxygen, thereby ensuring the quality of the product.

[0004] However, the service life of the scraper is short under high temperature conditions, and it is difficult to repair the scraper after it is damaged and deformed. Summary of the invention

[0005] Based on this, it is necessary to provide an acetylene carbon black preparation furnace cover, cracking furnace and preparation system to address the problems of short scraper service life under high temperature conditions and difficulty in repair after the scraper is damaged and deformed.

[0006] To achieve the above object, the present invention adopts the following scheme: An acetylene carbon black preparation furnace cover comprises: a cover body, an inner tube and an air blowing pipe, wherein the cover body is provided with an air inlet, and the air inlet is provided with an outer tube; the inner tube comprises a nozzle and a sleeve sealably arranged at one end of the nozzle, the other end of the nozzle is inserted into the outer tube, and a channel of 0.5 mm to 2.0 mm is formed between the nozzle and the outer tube, a purge port is provided at one end of the channel, the purge port is located at the end of the nozzle away from the sleeve, and the nozzle and the outer tube are connected by a sealing member; one end of the air blowing pipe passes through the outer tube, and the air blowing pipe is connected to the gas phase space of the channel, so as to add inert gas into the channel.

[0007] Preferably, the channel includes a guide portion and a guiding portion, the guide portion is located below the air blowing tube and parallel to the outer tube; the guide portion is arranged at an end of the guide portion away from the sleeve, and the guide portion and the guide portion form an angle of 100° to 170°.

[0008] Preferably, the gaps between the guiding parts are both 0.5 mm to 2.0 mm.

[0009] Preferably, the channel further includes an air inlet portion, which is disposed above the guide portion, and a gap of the air inlet portion is 0.5 mm to 5.0 mm.

[0010] Preferably, the sealing member comprises an upper flange plate and a lower flange plate, the upper flange plate is arranged at one end of the nozzle close to the sleeve, the lower flange plate is arranged at one end of the outer tube away from the cover body, and the upper flange plate and the lower flange plate are detachably sealed and connected.

[0011] Preferably, a sealing rubber ring is provided between the lower flange plate and the upper flange plate.

[0012] Preferably, a stabilizing frame is provided on the cover body, and the stabilizing frame is connected to the outer wall of the outer tube.

[0013] An acetylene carbon black cracking furnace comprises any one of the acetylene carbon black preparation furnace covers.

[0014] An acetylene carbon black preparation system comprises the acetylene carbon black cracking furnace.

[0015] The technical solution adopted in this application can achieve the following beneficial effects: The scraping method of scraping with a scraper is replaced by blowing off the coke with an inert gas, thereby solving the problems of short scraper service life under high temperature conditions and difficulty in repairing the scraper after it is damaged and deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a cross-sectional view of a furnace cover for preparing acetylene black disclosed in an embodiment of the present application.

[0017] Figure 2 This is an enlarged view of part A of an acetylene black preparation furnace cover disclosed in an embodiment of the present application.

[0018] Figure 3 This is a disassembled cross-sectional view of a furnace cover for preparing acetylene carbon black disclosed in an embodiment of the present application.

[0019] Among them: cover body 100, outer tube 110, lower flange plate 111, sealing rubber ring 112, stabilizing frame 113, inner tube 200, nozzle 210, upper flange plate 211, sleeve 220, blowing pipe 300, channel 400, air inlet part 410, guide part 420, guide part 430. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0021] It should be noted that when a device is considered to be "connected" to another device, it may be directly connected to the other device or there may be an intermediate device at the same time. The terms "inside", "top", "upper", "lower", "upper", "lower" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] See also Figures 1 to 3The present application provides an acetylene carbon black preparation furnace cover, comprising: a cover body 100, an inner tube 200 and an air blowing pipe 300, wherein the cover body 100 is provided with an air inlet, and the air inlet is provided with an outer tube 110; the inner tube 200 comprises a nozzle 210 and a sleeve 220 sealed at one end of the nozzle 210, one end of the nozzle 210 is inserted into the outer tube 110, and a channel 400 of 0.5 mm to 2.0 mm is formed between the nozzle 210 and the outer tube 110, one end of the channel 400 is provided with a purge port, the purge port is located at one end of the nozzle 210 away from the sleeve 220, and the nozzle 210 and the outer tube 110 are connected by a seal; and one end of the air blowing pipe 300 passes through the outer tube 110, and the air blowing pipe 300 is connected to the gas phase space of the channel 400, so as to add inert gas into the channel 400.

[0024] Specifically, the lower end surface of the cover body 100 is provided with a slot, a thread or the like for opening and disassembly, and can be sealed and connected to the cracking furnace. An air inlet is provided in the middle part of the cover body 100 (at the center of the circle of the horizontal section), and the outer wall of one end of the outer tube 110 is fixed and sealed and connected to the air inlet of the cover body 100, and one end of the outer tube 110 is flush with the lower end surface of the cover body 100; the nozzle 210 is sealed and connected to the sleeve 220, the nozzle 210 is a straight tube, the sleeve 220 is a curved tube, and the nozzle 210 is away from the sleeve. One end of 220 extends into the inner wall of the outer tube 110 and is flush with the end of the outer tube 110 close to the cover body 100, and a seal is used to seal the nozzle 210 and the outer tube 110; a through hole of 0.5mm to 2mm is formed between the nozzle 210 and the outer tube 110 (the inner diameter of the outer tube 110 is slightly larger than the outer diameter of the nozzle 210), preferably a through hole of 2mm; the air blowing tube 300 is arranged perpendicular to the outer tube 110, and one end passes through the outer tube 110 and is connected to the gas phase space of the through hole.

[0025] An ignition port is provided on the cover body 100, the ignition port is located on one side of the air inlet, and an ignition device is provided. The ignition device can be a commonly used igniter made of acetylene carbon black; an observation hole can be provided on the cover body 100 as needed; an auxiliary material feed pipe is provided on the sleeve 220, and the auxiliary material feed pipe is used to add auxiliary materials into the cracking furnace.

[0026] Furthermore, the cover body 100 is sealed and set on the cracking furnace, and raw materials are introduced into the cracking furnace through the sleeve 220 (the ignition device has been ignited). After the cracking furnace has been working for a period of time (or observed through the observation hole), an inert gas (such as nitrogen) is introduced into the blowing pipe 300, and the gas is blown downward along the channel 400 to blow off the coke at the air inlet of the cover body 100. After the coke is blown off, the introduction of the inert gas is stopped, and the preparation process of acetylene black is continued.

[0027] The present application adopts a technical solution of preparing furnace cover with acetylene carbon black to achieve the following beneficial effects: The scraping method of scraping with a scraper is replaced by blowing off the coke with an inert gas, thereby solving the problems of short scraper service life under high temperature conditions and difficulty in repairing the scraper after it is damaged and deformed.

[0028] In the above scheme, in order to solve the problem of blowing direction, the channel 400 includes a guide portion 420 and a guide portion 430, the guide portion 420 is located below the blowing pipe 300 and is parallel to the outer tube 110; the guide portion 430 is arranged at one end of the guide portion 420 away from the sleeve 220, and the guide portion 430 and the guide portion 420 form an angle of 100° to 170°.

[0029] Specifically, the channel 400 extends from the highest point of the blowing pipe 300 to the end of the outer tube 110 close to the cover body 100. The guide portion 420 is a straight portion and is parallel to the outer wall of the outer tube 110. The inclined extension direction of the guide portion 430 and the extension direction of the guide portion 420 form an angle of 100° to 170°, preferably 105°. The inert gas enters the guide portion 420, and then the vertically downward gas is changed through the guide portion 430 to be blown out obliquely toward the center of the cover body 100, thereby making the blowing velocity of the inert gas greater and playing the role of bringing the stress inward, solving the problem of difficulty in blowing off coke.

[0030] Based on the above solution, in order to solve the problem of slow gas flow rate, the gap between the guide part 420 and the guide part 430 is 0.5mm to 2.0mm. The channel 400 also includes an air inlet 410, which is arranged above the guide part 420, and the gap between the air inlet 410 is 0.5mm to 5.0mm.

[0031] The air inlet 410 is arranged at the air blowing pipe 300, and the distance between the nozzle 210 and the outer tube 110 at the air inlet 410 is greater than the distance between the nozzle 210 and the outer tube 110 at the guide part 420. The optimal solution is: the distance between the nozzle 210 and the outer tube 110 at the air inlet 410 is 5 mm, and the distance between the nozzle 210 and the outer tube 110 at the guide part 420 is 2 mm. The air inlet 410 and the guide part 420 are connected as a whole through a smooth arc. When the inert gas enters the air inlet 410, the air inlet 410 is filled with gas, and the gas phase space of the guide part 420 is reduced, so that the flow rate of the inert gas is accelerated for the first time, and then enters the guide part 430 along the guide part 420. The inert gas changes direction for a second acceleration and stress concentration, thereby solving the problem that the gas loss is slow and the coking at the air inlet of the cover body 100 cannot be blown off.

[0032] In another embodiment of the present application, in order to improve the sealing performance between the nozzle 210 and the outer tube 110, the sealing member includes an upper flange plate 211 and a lower flange plate 111, the upper flange plate 211 is arranged at one end of the nozzle 210 close to the sleeve 220, the lower flange plate 111 is arranged at one end of the outer tube 110 away from the cover body 100, and the upper flange plate 211 and the lower flange plate 111 are detachably sealed and connected.

[0033] Furthermore, a sealing rubber ring 112 is provided between the lower flange plate 111 and the upper flange plate 211 .

[0034] A groove is provided on the upper end surface of the lower flange plate 111, a protrusion is provided on the upper flange plate 211, and the sealing rubber ring 112 is placed in the groove. The lower flange plate 111 and the upper flange plate 211 are connected by bolts, so that the protrusion fits tightly with the sealing rubber ring 112 in the groove, thereby increasing the sealing effect and solving the problem of low efficiency in preparing acetylene carbon black caused by external gas entering the cracking furnace through the gap.

[0035] Based on the above solution, a stabilizing frame 113 is provided on the cover body 100, and the stabilizing frame 113 is connected to the outer wall of the outer tube 110. The height of the stabilizing frame 113 is half of the height of the outer tube 110, and is located below the air blowing pipe 300. An inclined hole is provided on the stabilizing frame 113, and the inclined hole forms a 45° angle with the ignition port on the cover body 100. By passing the ignition device through the inclined hole and extending it into the ignition port, the ignition end of the ignition device is closer to the air inlet of the cover body 100, and ignition is more convenient; the stabilizing frame 113 is provided to solve the problem that the outer tube 110 is too high and the outer tube 110 is tilted and the channel 400 is deformed when shaking, and the overall stability is improved at the same time.

[0036] An acetylene carbon black cracking furnace comprises the above-mentioned acetylene carbon black preparation furnace cover.

[0037] By setting an acetylene black preparation furnace cover on the cracking furnace, the inert gas enters into the channel 400 from the blowing pipe 300, and is temporarily stored from the air inlet 410 of the channel 400, and enters the guide part 420; the gas passes through the guide part 420 with a smaller space, so that the flow rate of the gas is increased, and then enters the guide part 430 with a changed direction from the guide part 420, and the gas flowing vertically downward is blown toward the center of the cover body 100 through the guide part 430, thereby increasing the blowing stress and accelerating the falling of coke.

[0038] An acetylene carbon black preparation system comprises the acetylene carbon black cracking furnace.

[0039] The above-described embodiments only express the way of equipment layout of the present application, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application; it should be pointed out that for ordinary technicians in this field, several adjustments and improvements can be made without departing from the concept of the present application, which all belong to the scope of protection of the present application; therefore, the scope of protection of the patent of this application shall be based on the attached claims.

Claims

1. A furnace cover for preparing acetylene carbon black, characterized in that: include: A cover body, wherein the cover body is provided with an air inlet, and the air inlet is provided with an outer tube; An inner tube, the inner tube comprising a nozzle and a sleeve sealably arranged at one end of the nozzle, the other end of the nozzle is inserted into the outer tube, and a channel of 0.5 mm to 2.0 mm is formed between the nozzle and the outer tube, a purge port is arranged at one end of the channel, the purge port is located at one end of the nozzle away from the sleeve, and the nozzle and the outer tube are connected by a seal; as well as An air blowing pipe, one end of which passes through the outer pipe, and the air blowing pipe is communicated with the gas phase space of the channel, and is used for adding inert gas into the channel.

2. The acetylene carbon black preparation furnace cover according to claim 1, characterized in that: The channel includes a guide portion and a guiding portion, the guide portion is located below the air blowing pipe and parallel to the outer tube; the guide portion is arranged at one end of the guide portion away from the sleeve, and the guide portion and the guide portion form an angle of 100° to 170°.

3. The acetylene carbon black preparation furnace cover according to claim 2, characterized in that: The gaps between the guide parts are 0.5 mm to 2.0 mm.

4. The acetylene carbon black preparation furnace cover according to claim 3, characterized in that: The channel further includes an air inlet portion, which is disposed above the guide portion, and a gap of the air inlet portion is 0.5 mm to 5.0 mm.

5. The acetylene carbon black preparation furnace cover according to claim 1, characterized in that: The sealing member comprises an upper flange plate and a lower flange plate, wherein the upper flange plate is arranged at one end of the nozzle close to the sleeve, and the lower flange plate is arranged at one end of the outer tube away from the cover body, and the upper flange plate and the lower flange plate are detachably sealed and connected.

6. The acetylene carbon black preparation furnace cover according to claim 5, characterized in that: A sealing rubber ring is arranged between the lower flange plate and the upper flange plate.

7. The acetylene carbon black preparation furnace cover according to claim 1, characterized in that: The cover body is provided with a stabilizing frame, and the stabilizing frame is connected to the outer wall of the outer tube.

8. An acetylene carbon black cracking furnace, characterized in that: The invention comprises a furnace cover for preparing acetylene carbon black as described in any one of claims 1 to 7.

9. An acetylene carbon black preparation system, characterized in that: Comprising the acetylene carbon black cracking furnace as described in claim 8.

Images