Methanol furnace outer cracking device and method for salt bath quenching furnace

Abstract

The present application relates to gas generating device technical field, particularly to a kind of methanol furnace outer pyrolysis device and method for salt bath quenching furnace.The methanol furnace outer pyrolysis device for salt bath quenching furnace includes reaction cylinder, gas guide pipe, catalytic cylinder and heat exchange cylinder, reaction cylinder is fixedly arranged, reaction cylinder is provided with end cap, upper cavity and lower cavity are sequentially arranged in reaction cylinder along vertical direction, gas guide pipe is arranged in upper cavity, and gas guide pipe can communicate upper cavity and lower cavity, and vaporized methanol enters into upper cavity from lower cavity;Catalytic cylinder is provided with multiple, multiple catalytic cylinders are sequentially sleeved on gas guide pipe from inside to outside, and adjacent two catalytic cylinders are slidingly connected.When methanol in reaction cylinder is cracked for a period of time, the amount of carbon deposition on the surface of catalyst on the filter screen of the catalytic cylinder closest to gas guide pipe is relatively large, at this time, end cap can be opened, the catalytic cylinder is extracted, and new catalytic cylinder is sleeved on the outer periphery of the remaining catalytic cylinder on the outer periphery of gas guide pipe, so that the utilization rate of catalytic cylinder can be improved while being convenient to replace.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas generating devices, in particular to a methanol off-furnace cracking device for a salt bath quenching furnace and a method thereof. BACKGROUND

[0002] In the field of modern industrial manufacturing, especially in the process of metal heat treatment, salt bath quenching furnaces play a crucial role. With the increasing emphasis on environmental protection and the deep adjustment of energy structure worldwide, the use of hydrogen as fuel in salt bath quenching furnaces has gradually entered people's field of vision.

[0003] Although the traditional method of hydrogen production is mature, it is constrained by cost and environmental protection policies, causing the economic benefits of enterprises relying on this method to decline and the development of projects to be limited.

[0004] Methanol, as a basic chemical raw material, is widely available and easy to store and transport. China, as a major methanol producer, has sufficient methanol supply guarantee. Methanol cracking hydrogen production technology has emerged as the times require, which uses methanol to produce hydrogen through cracking and conversion reactions under the action of a catalyst.

[0005] The catalyst inside the existing reactor gradually loses activity after a long period of operation and needs to be replaced regularly to maintain efficient cracking reactions. However, the existing reactor structure design makes the operation of replacing the catalyst extremely complex, often requiring the disassembly of a large number of auxiliary components. Moreover, the existing reactor structure often requires complete replacement of the catalyst, resulting in waste of catalyst that has not completely lost activity, while the use of partial replacement methods can easily lead to incomplete cracking reactions. SUMMARY

[0006] Therefore, it is necessary to provide a methanol off-furnace cracking device for a salt bath quenching furnace and a method thereof to address the inconvenience of replacing the catalyst inside the reactor and the incomplete cracking reactions caused by partial replacement of the catalyst.

[0007] The above-mentioned purpose is achieved by the following technical solutions:

[0008] The application discloses a methanol furnace outer cracking device for a salt bath quenching furnace, which comprises a vaporizer, a superheater and a reactor, the vaporizer is used for vaporizing methanol, the superheater is used for heating the vaporized methanol, and the heated methanol enters the reactor; the reactor comprises a reaction cylinder, a gas guide pipe, a catalyst cylinder and a heat exchange cylinder, the reaction cylinder is fixedly arranged and is provided with an end cover, the reaction cylinder is sequentially provided with an upper cavity and a lower cavity in the vertical direction, the gas guide pipe is arranged in the upper cavity and one end of the gas guide pipe is communicated with the lower cavity, the other end of the gas guide pipe extends to the end cover, a plurality of gas outlet holes for communicating the upper cavity and the inside of the gas guide pipe are formed in the circumferential surface of the gas guide pipe, and the vaporized methanol enters the upper cavity from the lower cavity; the catalyst cylinder is provided with a plurality of catalyst cylinders which are sequentially sleeved on the gas guide pipe from inside to outside, and two adjacent catalyst cylinders are slidably connected; the heat exchange cylinder is arranged on the circumferential surface of the gas guide pipe and is located between the catalyst cylinder and the gas guide pipe, and is used for heating the methanol in the gas guide pipe to a preset temperature.

[0009] Preferably, the catalyst cylinder comprises a support cylinder and a filter screen, the circumferential surface of the support cylinder is in a wave shape, the support cylinder is elastic, the support cylinder is provided with two support cylinders which are sleeved on the gas guide pipe and are arranged in the axial direction of the gas guide pipe, the filter screen is arranged between the two support cylinders and is connected with the end faces of the two support cylinders respectively, the filter screen extends around the end face of the support cylinder in the circumferential direction of the support cylinder and is connected in a head-to-tail mode, and the filter screen is attached with a catalyst.

[0010] Preferably, the catalyst cylinder further comprises a plurality of supporting rods and a plurality of vertical rods, the supporting rods are elastic and are connected in a head-to-tail mode, the shape of the supporting rod is consistent with that of the support cylinder, the plurality of supporting rods are located between the two support cylinders and are uniformly arranged in the axial direction of the gas guide pipe, the two ends of each vertical rod are fixedly connected with the two support cylinders respectively, each vertical rod extends in the axial direction of the gas guide pipe, the plurality of vertical rods are uniformly arranged in the circumferential direction of the top ring, and each vertical rod is connected with the plurality of supporting rods.

[0011] Preferably, the thickness of the filter screen in the radial direction of the gas guide pipe is smaller than the thickness of the support cylinder, the vertical rod and the supporting rod in the radial direction of the gas guide pipe, and the support cylinder and the vertical rod in the two adjacent catalyst cylinders are slidably connected.

[0012] Preferably, a plurality of fixing plates are arranged in the upper cavity of the reaction cylinder and are arranged in the vertical direction, a plurality of air permeation holes and a taper hole are formed in each fixing plate, the plurality of air permeation holes are arranged in the vertical direction and are uniformly distributed on the fixing plate, the taper hole penetrates through the fixing plate in the axial direction of the gas guide pipe, the gas guide pipe is arranged in the taper hole, the taper hole comprises a large-end opening and a small-end opening, the small-end opening is located below the large-end opening, and the diameter of the small-end opening is larger than the diameter of the gas guide pipe.

[0013] Preferably, an inclined surface is formed on the side of the support cylinder which is away from the filter screen, and the inclined surface gradually moves away from the filter screen from the side close to the gas guide pipe to the side away from the gas guide pipe.

[0014] Preferably, a baffle plate is arranged in the reaction cylinder, the baffle plate is located between the upper cavity and the lower cavity, and one end of the gas guide pipe penetrates through the baffle plate and is fixedly connected with the baffle plate; the heat exchange cylinder comprises a gas inlet cylinder, a gas outlet cylinder, first pipes, second pipes and a communication cover, the gas inlet cylinder and the gas outlet cylinder are sleeved on the gas guide pipe, and the gas inlet cylinder and the gas outlet cylinder are both located in the lower cavity; a plurality of first pipes and a plurality of second pipes are arranged, one end of the plurality of first pipes is fixedly installed on the gas inlet cylinder and communicates with the gas inlet cylinder, one end of the plurality of second pipes is fixedly installed on the gas outlet cylinder and communicates with the gas outlet cylinder, the plurality of first pipes and the plurality of second pipes are uniformly and alternately arranged around the gas guide pipe, the plurality of first pipes and the plurality of second pipes are spirally arranged on the gas guide pipe and extend along the axial direction of the gas guide pipe, and a spacing is arranged between adjacent first pipes and second pipes; the communication cover is arranged on one end of the gas guide pipe away from the lower cavity, one end of the plurality of first pipes away from the gas inlet cylinder and one end of the plurality of second pipes away from the gas outlet cylinder are connected with the communication cover, and the plurality of first pipes and the plurality of second pipes are communicated through the communication cover.

[0015] Preferably, a baffle plate and a gas outlet are arranged on the end cover, one of the catalytic cylinders abuts against the baffle plate, the other of the catalytic cylinders abuts against the baffle plate, the gas outlet is located on the side of the baffle plate away from the catalytic cylinder, and a plurality of through holes are arranged on the baffle plate; a gas inlet is arranged on the reaction cylinder, the gas inlet communicates with the lower cavity, and is used for introducing the methanol in the superheater into the reaction cylinder.

[0016] Preferably, one gas guide pipe, a plurality of catalytic cylinders and one heat exchange cylinder form a catalytic group, and a plurality of catalytic groups are arranged in the reaction cylinder.

[0017] The application also provides a methanol furnace outer cracking method for a salt bath quenching furnace, which comprises the following steps:

[0018] S1, the methanol is vaporized after passing through the vaporizer.

[0019] S2, the vaporized methanol is heated by the superheater.

[0020] S3, the heated vaporized methanol enters the lower cavity of the reactor, and then the vaporized methanol contacts the heat exchange cylinder through the gas guide pipe, and the heat exchange cylinder heats the vaporized methanol to a preset temperature.

[0021] S4, the vaporized methanol leaving the gas guide pipe is cracked by the catalytic cylinder.

[0022] The beneficial effects of the present application are that: the design of the multiple catalytic cylinder sleeve increases the contact time of methanol with the catalyst, after the methanol is discharged from the gas guide pipe, the methanol that is not able to react with the catalyst in time can react with the catalyst contacted subsequently; when the methanol in the reaction cylinder is cracked for a period of time, the carbon deposition amount on the surface of the catalyst on the filter screen of the catalytic cylinder closest to the gas guide pipe is relatively large, at this time, the end cover can be opened to extract the catalytic cylinder, and a new catalytic cylinder can be sleeved on the periphery of the remaining catalytic cylinders on the outer periphery of the gas guide pipe, which facilitates replacement and also improves the utilization rate of the catalytic cylinder; the carbon deposition amount on the surface of the catalyst in the catalytic cylinder far from the gas guide pipe is relatively small, which can enable the methanol entering the upper cavity to be fully cracked; the heat exchange cylinder is arranged, which can maintain the temperature of the methanol about to contact the filter screen at a preset value, thereby improving the cracking efficiency of the methanol. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structural schematic view of a methanol furnace external cracking device for a salt bath quenching furnace is provided for the embodiments of the present application.

[0024] Figure 2 A sectional view of a methanol furnace external cracking device for a salt bath quenching furnace is provided for the embodiments of the present application.

[0025] Figure 3 A Figure 2 An enlarged view of B;

[0026] Figure 4 A Figure 2 An enlarged view of A;

[0027] Figure 5 A structural schematic view of a heat exchange cylinder of a methanol furnace external cracking device for a salt bath quenching furnace is provided for the embodiments of the present application.

[0028] Figure 6 A structural schematic view of a catalytic cylinder of a methanol furnace external cracking device for a salt bath quenching furnace is provided for the embodiments of the present application.

[0029] Among them:

[0030] 100, reaction cylinder; 101, gas guide pipe; 102, end cover; 103, upper cavity; 104, lower cavity; 105, baffle; 106, gas outlet; 107, gas inlet; 108, partition; 110, support cylinder; 111, filter screen; 112, support strip; 113, vertical rod; 114, fixed plate; 120, gas inlet cylinder; 121, gas outlet cylinder; 122, first pipe; 123, second pipe; 124, communication cover. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0032] The numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and have no technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In the present application, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] As Figures 1 to 6As shown, the methanol furnace outer cracking device for salt bath quenching furnace provided by the embodiment of the application comprises a vaporizer, a superheater and a reactor. The vaporizer is used for vaporizing methanol, and the superheater is used for heating the vaporized methanol. The heated methanol enters the reactor. The reactor comprises a reaction cylinder 100, a gas guide pipe 101, a catalytic cylinder and a heat exchange cylinder. The reaction cylinder 100 is fixedly arranged and is provided with an end cover 102. The reaction cylinder 100 is sequentially provided with an upper cavity 103 and a lower cavity 104 in the vertical direction. The gas guide pipe 101 is arranged in the upper cavity 103 and has one end in communication with the lower cavity 104 and the other end extending towards the end cover 102. A plurality of gas outlet holes for communicating the upper cavity 103 and the interior of the gas guide pipe 101 are formed in the circumferential surface of the gas guide pipe 101. The vaporized methanol enters the upper cavity 103 from the lower cavity 104. The catalytic cylinder is provided with a plurality of catalytic cylinders which are sequentially sleeved on the gas guide pipe 101 from the inside to the outside, and the adjacent two catalytic cylinders are slidably connected. The heat exchange cylinder is arranged on the circumferential surface of the gas guide pipe 101 and is located between the catalytic cylinder and the gas guide pipe 101, and is used for heating the methanol in the gas guide pipe 101 to a preset temperature.

[0035] The design of the sleeved catalytic cylinders increases the contact time of the methanol with the catalyst. After the methanol is discharged from the gas guide pipe 101, the methanol that is not able to react with the catalyst in time can react with the catalyst contacted subsequently. When the methanol in the reaction cylinder 100 is cracked for a period of time, the carbon deposition amount on the surface of the catalyst on the filter screen 111 of the catalytic cylinder closest to the gas guide pipe 101 is relatively large. At this time, the end cover 102 can be opened to extract the catalytic cylinder, and a new catalytic cylinder can be sleeved on the outer periphery of the remaining catalytic cylinders on the outer circumferential surface of the gas guide pipe 101. The design facilitates replacement and improves the utilization rate of the catalytic cylinders. The carbon deposition amount on the surface of the catalyst in the catalytic cylinder far from the gas guide pipe 101 is relatively small, which enables the methanol entering the upper cavity 103 to be fully cracked. The heat exchange cylinder is arranged to maintain the temperature of the methanol about to contact the filter screen 111 at a preset value, thereby improving the cracking efficiency of the methanol.

[0036] In the embodiment, the catalytic cylinder comprises a supporting cylinder 110 and a filter screen 111, the circumferential surface of the supporting cylinder 110 is wavy, the supporting cylinder 110 is elastic, two supporting cylinders 110 are arranged on the air guide pipe 101 in the axial direction of the air guide pipe 101, the filter screen 111 is arranged between the two supporting cylinders 110, and the filter screen 111 is connected with the end surfaces of the two supporting cylinders 110 respectively, the filter screen 111 extends around the supporting cylinder 110 on the end surface of the supporting cylinder 110 in the circumferential direction of the supporting cylinder 110 and connects head to tail, and the catalyst is attached to the filter screen 111. Through the cooperation of the supporting cylinder 110 and the filter screen 111, the circumferential surfaces of the supporting cylinder 110 and the filter screen 111 are uneven, and the supporting cylinder 110 and the filter screen 111 can contract or expand in the radial direction of the air guide pipe 101 after being subjected to the pressure in the radial direction of the air guide pipe 101; at the same time, the supporting cylinders 110 arranged in multiple layers also have pressure between each other, the supporting cylinder 110 located in the innermost layer is subjected to the maximum extrusion force and can drive the corresponding filter screen 111 to contract; on the contrary, the supporting cylinder 110 located in the outermost layer is subjected to the maximum expansion force and can drive the corresponding filter screen 111 to expand accordingly.

[0037] In the embodiment, the catalytic cylinder further comprises a plurality of supporting rods 112 and a plurality of vertical rods 113, each of the supporting rods 112 is elastic and connected head to tail, the shape of the supporting rod 112 is consistent with the shape of the supporting cylinder 110, the plurality of supporting rods 112 are located between the two supporting cylinders 110 and arranged uniformly in the axial direction of the air guide pipe; the two ends of each vertical rod 113 are fixedly connected with the two supporting cylinders 110 respectively, and each vertical rod 113 extends in the axial direction of the air guide pipe, the plurality of vertical rods 113 are arranged uniformly in the circumferential direction of the top ring, and among the two adjacent vertical rods 113, one vertical rod 113 is connected with two wave crests of the two supporting cylinders 110, and the other vertical rod 113 is connected with two wave troughs of the two supporting cylinders 110, each vertical rod 113 is connected with the plurality of supporting rods 112, and the vertical rod 113 connected with the wave crest of the supporting cylinder 110 is also connected with one wave crest of the plurality of supporting rods 112. The plurality of supporting rods 112 and the plurality of vertical rods 113 can increase the overall strength of the catalytic cylinder.

[0038] In the embodiment, the thickness of the filter screen 111 in the radial direction of the air guide pipe is less than the thickness of the supporting cylinder 110, the vertical rod 113 and the supporting rod 112 in the radial direction of the air guide pipe, the supporting cylinder 110 and the vertical rod 113 of the two adjacent catalytic cylinders are connected in sliding mode, the filter screen 111 in one catalytic cylinder will not contact with another catalytic cylinder when the two catalytic cylinders slide with each other, and the accumulated carbon on the filter screen 111 will not easily fall off when the catalytic cylinder is inserted or pulled out.

[0039] In this embodiment, the reaction cylinder 100 is provided with multiple fixing plates 114, which are disposed in the upper cavity 103 and arranged vertically. Each fixing plate 114 has a vent hole and a conical hole. Multiple vent holes are provided, penetrating the fixing plate 114 vertically and evenly distributed on it. Gas in the upper cavity 103 can pass through the fixing plate 114 through the vent holes. The conical holes penetrate the fixing plate 114 along the axial direction of the gas guide pipe 101. The gas guide tube 101 is disposed in the conical hole, the diameter of which is larger than the diameter of the gas guide tube 101. The conical hole includes a large end and a small end, with the small end located below the large end. When multiple support tubes 110 are sleeved onto the gas guide tube 101, the diameter of the outermost catalytic tube that is continuously wrapped will increase. Under the guidance of the conical surface of the conical hole, the catalytic tube squeezes the catalytic tubes inside, causing the multiple catalytic tubes to shrink. At the same time, the fixing plate 114 can also support the catalytic tubes.

[0040] In this embodiment, the side of the support cylinder 110 away from the filter screen 111 has an inclined surface. The inclined surface gradually moves away from the filter screen 111 from the side near the gas guide pipe 101 to the side away from the gas guide pipe 101. When two adjacent catalytic cylinders are nested together, the support cylinder 110 in the outer ring catalytic cylinder slides into contact with the support cylinder 110 in the inner ring catalytic cylinder through its own inclined surface. The support cylinder 110 in the outer ring catalytic cylinder will be expanded, and at the same time, the support cylinder 110 in the inner ring catalytic cylinder will also be subjected to a contraction force, which facilitates the installation of the catalytic cylinder.

[0041] In this embodiment, a partition 108 is provided inside the reaction cylinder 100. The partition 108 is located between the upper cavity 103 and the lower cavity 104. One end of the gas guide pipe 101 passes through the partition 108 and is fixedly connected to the partition 108. The heat exchange cylinder includes an inlet cylinder 120, an outlet cylinder 121, a first pipe 122, a second pipe 123, and a connecting cover 124. The inlet cylinder 120 and the outlet cylinder 121 are sleeved on the gas guide pipe 101, and both the inlet cylinder 120 and the outlet cylinder 121 are... Located in the lower cavity 104; multiple first tubes 122 and multiple second tubes 123 are provided. One end of each of the multiple first tubes 122 is fixedly installed on the air inlet cylinder 120 and is connected to the air inlet cylinder 120. One end of each of the multiple second tubes 123 is fixedly installed on the air outlet cylinder 121 and is connected to the air outlet cylinder 121. The multiple first tubes 122 and multiple second tubes 123 are evenly and alternately arranged around the air guide tube 101, and the multiple first tubes 122 and multiple second tubes 123 are spirally wound. The gas in the gas duct 101 extends along its axial direction. A gap is provided between adjacent first pipes 122 and second pipes 123. Gas in the gas duct 101 is discharged through the outlet and the gap between the first pipe 122 and the second pipe 123. A connecting cover 124 is provided on the end of the gas duct 101 away from the lower cavity 104. The ends of the multiple first pipes 122 away from the inlet cylinder 120 and the ends of the multiple second pipes 123 away from the outlet cylinder 121 are all connected to the connecting cover 124. The multiple first pipes 122 and the multiple second pipes 123 are connected through the connecting cover 124. A heat exchange medium is introduced into the heat exchange cylinder. The heat exchange medium enters the multiple first pipes 122 from the inlet cylinder 120, then enters the second pipes 123 through the connecting cover 124, and finally exits through the outlet cylinder 121. The first pipes 122 and the second pipes 123 can make the temperature of the gas duct 101 more uniform and the methanol cracking more complete.

[0042] In this embodiment, the end cap 102 is provided with a baffle 105 and a gas outlet 106. One branch 110 of the catalytic cylinder abuts against the partition 108, and the other branch 110 of the catalytic cylinder abuts against the baffle 105. Methanol discharged from the gas guide pipe 101 can only enter the upper chamber 103 through the filter screen 111 in the catalytic cylinder. The gas outlet 106 is located on the side of the baffle 105 away from the catalytic cylinder. The baffle 105 has multiple through holes. The catalytically processed product can be discharged from the reaction cylinder 100 through the through holes and out of the gas outlet 106. The reaction cylinder 100 is provided with a gas inlet 107, which is connected to the lower chamber 104 and is used to introduce methanol from the superheater into the reaction cylinder 100.

[0043] In this embodiment, a gas guide pipe 101, multiple catalytic cylinders and a heat exchange cylinder constitute a catalytic group. Multiple catalytic groups are provided inside the reaction cylinder 100. The multiple catalytic groups are evenly arranged inside the reaction cylinder 100. The multiple catalytic groups participate in the methanol cracking process at the same time, which increases the reaction efficiency.

[0044] The working principle of the methanol furnace external cracking device for salt bath quenching furnace provided in the above embodiments is as follows:

[0045] First, heat exchange medium is introduced into the first pipe 122 through the air inlet 120. After flowing through the connecting cover 124, the heat exchange medium enters the second pipe 123 through the connecting cover 124. The heat exchange medium in the first pipe 122 and the second pipe 123 can keep the gas guide pipe 101 warm. Then, the vaporized and heated methanol enters the lower chamber 104 of the reaction cylinder 100 through the air inlet 107, and then enters the gas guide pipe 101. The methanol discharged from the outlet of the gas pipe 101 is heated to a preset temperature when it passes between the first pipe 122 and the second pipe 123. Then the methanol will approach the filter screen 111. After the methanol comes into contact with the filter screen 111, it reacts with the catalyst on the filter screen 111, and the resulting product will enter the upper chamber 103. Then the resulting product will approach the gas outlet 106 through the vent hole on the fixed plate 114, and finally be discharged from the gas outlet 106 from the gas outlet 106 into the reaction cylinder 100.

[0046] The methanol concentration of methanol exiting from the gas duct 101 decreases after it comes into contact with the filter screen 111. The amount of methanol that comes into contact with the multiple catalytic cylinders gradually decreases from the inside out, and the amount of carbon deposited on the catalyst surface of the filter screen 111 in the innermost catalytic cylinder is relatively large. When the amount of carbon deposits on the filter screen 111 in the innermost catalytic converter reaches a certain level, open the end cap 102 and then pull one of the support cylinders 110 in the innermost catalytic converter. This support cylinder 110 pulls another support cylinder 110 to move together via the vertical rod 113. At the same time, the filter screen 111 moves accordingly. After the catalytic converter that needs to be replaced is taken out, a new catalytic converter needs to be added. The support cylinder 110 of the new catalytic converter contacts the outermost support cylinder 110 fitted on the gas guide pipe 101 through its own inclined surface. The support cylinder 110 of the new catalytic converter will expand and continue to push the new catalytic converter to move in the axial direction along the gas guide pipe 101. The new catalytic converter is fitted on the outermost catalytic converter of the gas guide pipe 101. When the support cylinder 110 in the new catalytic converter contacts the fixing plate 114, the conical hole on the fixing plate 114 will cause the new catalytic converter to contract, and the vertical rod 113 is slidably connected to the fixing plate 114.

[0047] After one of the support cylinders 110 of the new catalyst cartridge comes into contact with the partition 108, the top cover 102 is placed on top, and the baffle 105 comes into contact with the other support cylinder 110 of the new catalyst cartridge, thus completing the replacement process.

[0048] The present invention also provides a method for methanol furnace-outside-furnace pyrolysis using a salt bath quenching furnace, comprising the following steps:

[0049] S1, methanol is vaporized after passing through the vaporizer; methanol feedstock enters the vaporizer and is vaporized in the vaporizer.

[0050] S2, the vaporized methanol is heated by the superheater; the vaporized methanol enters the superheater, and the superheater heats the vaporized methanol.

[0051] S3, the heated vaporized methanol enters the lower chamber 104 of the reactor, and then the vaporized methanol comes into contact with the heat exchange cylinder through the gas guide pipe 101. The heat exchange cylinder replenishes the temperature of the vaporized methanol to the preset temperature. After the methanol enters the lower chamber 104 of the reactor and then enters the gas guide pipe 101, heat loss is inevitable. The vaporized methanol after entering the gas guide pipe 101 will be heated to the preset temperature under the action of the first pipe 122 and the second pipe 123.

[0052] S4, the vaporized methanol leaving the gas pipe 101 undergoes a cracking reaction in the catalytic cylinder; after leaving the gas pipe 101, the vaporized methanol quickly comes into contact with the catalyst on the filter screen 111 in the catalytic cylinder and undergoes a cracking reaction, which reduces the temperature loss and makes the reaction more complete.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A methanol furnace external cracking device for a salt bath quenching furnace, comprising: A vaporizer, a superheater, and a reactor are provided. The vaporizer vaporizes methanol, and the superheater heats the vaporized methanol. The heated methanol then enters the reactor. The reactor comprises a reaction cylinder, a gas delivery pipe, a catalytic converter, and a heat exchanger. The reaction cylinder is fixedly mounted and has an end cap. An upper chamber and a lower chamber are arranged vertically inside the reaction cylinder. The gas delivery pipe is located in the upper chamber, with one end connected to the lower chamber and the other end extending towards the end cap. Multiple vent holes are provided on the circumference of the gas delivery pipe to connect the upper chamber and the interior of the gas delivery pipe. The vaporized methanol enters the upper chamber from the lower chamber. Multiple catalytic converters are arranged sequentially from the inside to the outside of the reaction cylinder. On the gas pipe, two adjacent catalytic converters are slidably connected; a heat exchanger is set on the circumference of the gas pipe and is located between the catalytic converter and the gas pipe, used to bring the methanol in the gas pipe to a preset temperature. The catalytic converter includes a support cylinder and a filter screen. The circumference of the support cylinder is wavy and elastic. There are two support cylinders, which are sleeved on the gas pipe and arranged along the axial direction of the gas pipe. The filter screen is set between the two support cylinders and is connected to the end faces of the two support cylinders respectively. The filter screen extends around the circumference of the support cylinder on the end face of the support cylinder and is connected end to end. The filter screen is coated with catalyst. The thickness of the filter screen in the radial direction of the guide pipe is less than the thickness of the support cylinder in the radial direction of the guide pipe. The catalytic converter also includes multiple The system consists of support bars and multiple vertical rods. The support bars are elastic and connected end-to-end. Their shape matches that of the support cylinders. Multiple support bars are located between two support cylinders and are evenly arranged along the axial direction of the guide tube. Each vertical rod is fixedly connected to two support cylinders at both ends and extends along the axial direction of the guide tube. Multiple vertical rods are evenly arranged around the top ring in the circumferential direction, and each vertical rod is connected to multiple support bars. The thickness of the filter screen in the radial direction of the guide tube is less than the thickness of the vertical rods and support bars in the radial direction of the guide tube. The support cylinders and vertical rods in adjacent catalytic cylinders are slidably connected. Multiple fixing plates are installed inside the reaction cylinder, positioned in the upper cavity and extending vertically. The components are arranged in a directional manner, and each fixed plate has a vent hole and a conical hole. The conical hole penetrates the fixed plate along the axial direction of the gas guide pipe, and the gas guide pipe is set in the conical hole. The conical hole includes a large end and a small end, and the small end of the conical hole is located below its large end. The diameter of the small end of the conical hole is larger than the diameter of the gas guide pipe. The side of the support cylinder away from the filter screen has an inclined surface. The inclined surface gradually moves away from the filter screen from the side close to the gas guide pipe to the side away from the gas guide pipe. After the methanol in the reaction cylinder has been cracked for a period of time, the amount of carbon deposit on the catalyst surface of the filter screen of the catalyst cylinder closest to the gas guide pipe is relatively large. At this time, the end cap can be opened to remove the catalyst cylinder, and a new catalyst cylinder can be fitted around the remaining catalyst cylinder on the outer periphery of the gas guide pipe.

2. The methanol external cracking device for a salt bath quenching furnace according to claim 1, characterized in that, Multiple vents are provided, which penetrate the fixed plate vertically and are evenly distributed on the fixed plate.

3. The methanol external cracking device for a salt bath quenching furnace according to claim 1, characterized in that, The reaction chamber is equipped with a baffle plate located between the upper and lower chambers. One end of the gas guide pipe passes through the baffle plate and is fixedly connected to it. The heat exchange cylinder includes an inlet cylinder, an outlet cylinder, a first pipe, a second pipe, and a connecting cover. The inlet cylinder and the outlet cylinder are fitted onto the gas guide pipe, and both the inlet cylinder and the outlet cylinder are located in the lower chamber. There are multiple first pipes and multiple second pipes. One end of each of the multiple first pipes is fixedly installed on the inlet cylinder and is connected to it. One end of each of the multiple second pipes is fixedly installed on the outlet cylinder and is connected to it. The multiple first pipes and multiple second pipes are evenly and alternately arranged around the gas guide pipe. The multiple first pipes and multiple second pipes are spirally wound around the gas guide pipe and extend along the axial direction of the gas guide pipe. There is a gap between adjacent first pipes and second pipes. The connecting cover is located on the end of the gas guide pipe away from the lower chamber. The ends of the multiple first pipes away from the inlet cylinder and the ends of the multiple second pipes away from the outlet cylinder are connected to the connecting cover, and the multiple first pipes and multiple second pipes are connected through the connecting cover.

4. The methanol external cracking device for a salt bath quenching furnace according to claim 1, characterized in that, The end cap is equipped with a baffle and an outlet. One branch of the catalytic tube abuts against the partition, and the other branch of the catalytic tube abuts against the baffle. The outlet is located on the side of the baffle away from the catalytic tube. Multiple through holes are opened on the baffle. The reaction tube is equipped with an end cap and an inlet. The inlet is connected to the lower chamber and is used to introduce methanol from the superheater into the reaction tube.

5. The methanol furnace external cracking device for a salt bath quenching furnace according to claim 1, characterized in that, A gas guide pipe, multiple catalytic cylinders and a heat exchange cylinder constitute a catalytic group. Multiple catalytic groups are set up inside the reaction cylinder. The multiple catalytic groups are evenly arranged inside the reaction cylinder.

6. A method for methanol furnace-outside-furnace pyrolysis in a salt bath quenching furnace, characterized in that, Using the methanol external cracking device for a salt bath quenching furnace as described in any one of claims 1 to 5, and Includes the following steps: S1, methanol is vaporized after passing through the vaporizer; S2, the vaporized methanol is heated by the superheater; S3, the heated vaporized methanol enters the lower chamber of the reactor, and then the vaporized methanol comes into contact with the heat exchange cylinder through the gas guide pipe. The heat exchange cylinder replenishes the temperature of the vaporized methanol to the preset temperature. S4, the vaporized methanol leaving the gas delivery pipe undergoes a cracking reaction in the catalytic cylinder.

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