A sectional formaldehyde production oxidation furnace quenching device

Abstract

The utility model discloses a sectional formaldehyde production oxidation furnace rapid cooling device, comprising an oxidation furnace body, an air inlet interface is arranged at the bottom of the oxidation furnace body, cooling tubes are installed on both sides of the oxidation furnace body, and an expansion joint is installed above the cooling tubes, a connecting pipe is installed above the expansion joint, and a positioning plate is installed at the connection between the connecting pipe and the expansion joint; a delivery pipeline is installed on the outside of the coolant storage tank, and a lifting pump is connected to one end of the delivery pipeline, and a water collecting tank is arranged below the lifting pump. Compared with the existing device, the sectional formaldehyde production oxidation furnace rapid cooling device can prevent the cooling tubes from thermal expansion by the expansion joint, and at the same time, the connecting pipe and the outer wall of the cooling tubes are sprayed with a high-temperature resistant internal scour coating, which can extend its service life, and the oxidation furnace is divided into two parts by the expansion joint, which can buffer the high-temperature formaldehyde gas, thereby reducing the temperature difference impact on the latter half of the tubes.

Description

Technical Field

[0001] The utility model relates to the technical field of oxidation furnace quenching devices, in particular to a segmented formaldehyde production oxidation furnace quenching device. Background Art

[0002] Formaldehyde is an organic compound and is widely used in industries such as petrochemicals, medicine, textiles, biochemicals, energy, and transportation. During the formaldehyde production process, the oxidation furnace needs to be cooled, so a formaldehyde production oxidation furnace quenching device is required.

[0003] The Chinese patent with the authorization publication number CN2611368Y discloses a formaldehyde oxidation furnace quenching section, which is composed of an oxidation furnace, tubes and upper and lower tube plates. The upper tube plate is parabolic, and an upper steam chamber is installed around the edge of the upper tube plate and the upper end of the oxidation furnace. The upper steam chamber is connected to the upper tube plate and the outer wall of the oxidation furnace and is connected to the shell layer of the oxidation furnace wall. A steam outlet is provided on the upper steam chamber. During use of the utility model, formaldehyde generated by methanol reaction and hot gas enters the oxidation furnace tube from the upper part of the oxidation furnace, and is quickly cooled by the cooling water entering the oxidation furnace to become formaldehyde liquid; at the same time, the cooling water is heated by the formaldehyde vapor with a high temperature and becomes water vapor and is discharged from the steam outlet of the upper steam chamber. Since the speed of formaldehyde cooling and cooling water heating is very fast, the efficiency of the oxidation furnace is improved. The utility model has the characteristics of reasonable design, simple structure, easy manufacture, good use effect, smooth exhaust, and can improve the working efficiency of the reactor.

[0004] Although the formaldehyde oxidation furnace quenching device mentioned above can improve the efficiency of the oxidation furnace and the working efficiency of the reactor, the quenching section of the oxidation furnace is an integrated type. Since the temperature of the silver catalytic reaction layer is relatively high, the high-temperature formaldehyde gas after the reaction is rapidly cooled after passing through the quenching section, causing the upper tube sheet of the quenching section to be in a state of steam-water erosion for a long time, resulting in the tube mouth rupture in a short period of time, a short service life, and an increase in the cost of replacing the quenching section of the oxidation furnace. For this reason, we propose a segmented formaldehyde production oxidation furnace quenching device. Utility Model Content

[0005] The utility model aims to provide a segmented formaldehyde production oxidation furnace quenching device to solve the problem raised in the above background technology that since the oxidation furnace quenching section is an integrated type, the temperature in the silver catalytic reaction layer is relatively high, and the high-temperature formaldehyde gas after the reaction is rapidly cooled after passing through the quenching section, causing the upper tube sheet of the quenching section to be in a state of steam-water erosion for a long time, resulting in tube mouth rupture in a short period of time, a short service life, and an increased cost for replacing the quenching section of the oxidation furnace.

[0006] To achieve the above purpose, the utility model provides the following technical solution: a segmented formaldehyde production oxidation furnace quenching device, comprising:

[0007] An oxidation furnace body, wherein an air inlet interface is provided at the bottom of the oxidation furnace body, cooling tubes are installed on both sides of the interior of the oxidation furnace body, and an expansion joint is installed above the cooling tubes, a connecting pipe is installed above the expansion joint, and a positioning plate is installed at the connection between the connecting pipe and the expansion joint, and positioning bolts are installed at both ends of the positioning plate;

[0008] A coolant storage tank is installed on both sides below the oxidation furnace body. A delivery pipeline is installed on the outside of the coolant storage tank, and one end of the delivery pipeline is connected to a lifting pump. A water collecting tank is arranged below the lifting pump. A furnace door is installed at one end of the oxidation furnace body.

[0009] Preferably, the oxidation furnace body is further provided with:

[0010] The gas exhaust port is arranged on both sides above the oxidation furnace body, and the gas inlet interface is connected with the gas exhaust port through the oxidation furnace body.

[0011] Preferably, the coolant storage tanks are symmetrically distributed about the vertical center line of the oxidation furnace body, and the coolant storage tanks form a communication structure with the water collecting tank through the delivery pipeline and the lifting pump.

[0012] Preferably, the water collecting tank is interconnected with the cooling tubes through a connecting pipe and an expansion joint, and the connecting pipe corresponds to the cooling tubes one by one.

[0013] Preferably, the cooling tubes are interconnected with the coolant storage tank, and the cooling tubes are symmetrically distributed about the vertical center line of the oxidation furnace body.

[0014] Preferably, the connecting pipe is fixedly connected to the positioning plate, and the positioning plate is detachably connected to the expansion joint via positioning bolts.

[0015] Compared with the prior art, the utility model provides a segmented formaldehyde production oxidation furnace quenching device, which has the following beneficial effects:

[0016] The utility model can transport cooling medium through connecting pipes, expansion joints and cooling tubes, so as to rapidly cool methanol gas under the action of silver catalyst, and the expansion joints can prevent the cooling tubes from expanding due to heat, and at the same time, high-temperature resistant inner scour coating is sprayed on the outer walls of the connecting pipes and cooling tubes, so as to extend their service life, and the oxidation furnace is divided into two parts by the expansion joint, so as to buffer the high-temperature formaldehyde gas, so as to reduce the temperature difference impact on the latter half of the tubes, and avoid the problem that the oxidation furnace rapid cooling section is integrated, and since the temperature in the silver catalytic reaction layer is relatively high, the high-temperature formaldehyde gas after the reaction is rapidly cooled after passing through the rapid cooling section, so that the upper tube plate of the rapid cooling section is in a state of steam-water erosion for a long time, resulting in the tube mouth rupture in a short period of time, a relatively short service life, and an increased cost for replacing the rapid cooling section of the oxidation furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the external structure of the utility model;

[0019] Figure 3 For this utility model Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 4 It is a structural schematic diagram of the connecting pipe of the utility model.

[0021] In the figure: 1. Oxidation furnace body; 2. Air inlet interface; 3. Cooling tubes; 4. Expansion joint; 5. Connecting pipe; 6. Gas outlet; 7. Coolant storage tank; 8. Lifting pump; 9. Delivery pipeline; 10. Positioning plate; 11. Positioning bolts; 12. Furnace door; 13. Water collecting tank. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-3A sectional formaldehyde production oxidation furnace quenching device comprises: an oxidation furnace body 1, an air inlet interface 2 is arranged at the bottom of the oxidation furnace body 1, cooling tubes 3 are installed on both sides of the inside of the oxidation furnace body 1, and an expansion joint 4 is installed above the cooling tubes 3, a connecting pipe 5 is installed above the expansion joint 4, and a positioning plate 10 is installed at the connection between the connecting pipe 5 and the expansion joint 4, a coolant storage tank 7 is installed on both sides below the oxidation furnace body 1, a delivery pipeline 9 is installed on the outside of the coolant storage tank 7, and a lifting pump 8 is connected to one end of the delivery pipeline 9, the coolant storage tank 7 is symmetrically distributed about the vertical center line of the oxidation furnace body 1, and the coolant storage tank 7 is connected to the water collecting tank 13 through the delivery pipeline 9 and the lifting pump 8; the coolant storage tank 7 can carry out cooling of the cooling medium required in the quenching process. Storage, the cooling medium can be extracted and transported to the water collecting tank 13 through the lifting pump 8 and the conveying pipeline 9; a water collecting tank 13 is arranged below the lifting pump 8, and a furnace door 12 is installed at one end of the oxidation furnace body 1; the water collecting tank 13 is interconnected with the cooling tubes 3 through the connecting pipe 5 and the expansion joint 4, and the connecting pipe 5 corresponds to the cooling tubes 3 one by one; the cooling tubes 3 are interconnected with the coolant storage tank 7, and the cooling tubes 3 are symmetrically distributed about the vertical center line of the oxidation furnace body 1. The cooling medium can be transported through the connecting pipe 5, the expansion joint 4 and the cooling tubes 3, so that the methanol gas under the action of the silver catalyst can be rapidly cooled, and the expansion joint 4 can prevent the cooling tubes 3 from thermal expansion problems. At the same time, a high-temperature resistant internal erosion coating is sprayed on the outer wall of the connecting pipe 5 and the cooling tubes 3, which can extend its service life.

[0024] See also Figure 1 , 3 And 4, a segmented formaldehyde production oxidation furnace quenching device, comprising: a gas exhaust port 6, which is arranged on both sides above the oxidation furnace body 1, and the air inlet interface 2 is interconnected with the gas exhaust port 6 through the oxidation furnace body 1; the air inlet interface 2 is convenient for passing formaldehyde gas into the oxidation furnace body 1, and the gas exhaust port 6 is convenient for the discharge of formaldehyde gas; positioning bolts 11 are installed at both ends of the positioning plate 10; the connecting pipe 5 is fixedly connected to the positioning plate 10, and the positioning plate 10 is detachably connected to the expansion joint 4 through the positioning bolts 11; the positioning bolts 11 can facilitate the connection and fixation of the positioning plate 10 and the expansion joint 4, and can also facilitate the disassembly and replacement of the connecting pipe 5 after the use cycle is reached.

[0025] Working principle: When using the segmented formaldehyde production oxidation furnace quenching device, first connect the formaldehyde gas to the air inlet interface 2, so that the formaldehyde gas can be introduced into the oxidation furnace body 1, and then start the lifting pump 8. The lifting pump 8 and the conveying pipeline 9 can extract the cooling medium in the coolant storage tank 7 and convey it to the water collecting tank 13; then the cooling medium can be conveyed through the connecting pipe 5, the expansion joint 4 and the cooling tube 3, so that the methanol gas under the action of the silver catalyst can be rapidly cooled and discharged through the gas outlet 6. The expansion joint 4 is used to prevent the cooling tube 3 from thermal expansion. At the same time, a high-temperature resistant internal scour coating is sprayed on the outer wall of the connecting pipe 5 and the cooling tube 3, which can extend its service life. At the same time, the oxidation furnace is divided into two parts by the expansion joint 4, which can buffer the high-temperature formaldehyde gas, thereby reducing the temperature difference impact on the second half of the tube. The gas outlet 6 is convenient for the discharge of formaldehyde gas; finally, the positioning bolts 11 are used to facilitate the connection and fixation of the positioning plate 10 and the expansion joint 4. After the tube reaches the service life, the connecting pipe 5 can be disassembled and replaced by the positioning bolts 11. This is the working principle of the sectional formaldehyde production oxidation furnace quenching device.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sectional formaldehyde production oxidation furnace quenching device, characterized in that: include: An oxidation furnace body (1), wherein an air inlet interface (2) is provided at the bottom of the oxidation furnace body (1), cooling tubes (3) are installed on both sides of the interior of the oxidation furnace body (1), and an expansion joint (4) is installed above the cooling tubes (3), a connecting pipe (5) is installed above the expansion joint (4), and a positioning plate (10) is installed at the connection between the connecting pipe (5) and the expansion joint (4), and positioning bolts (11) are installed at both ends of the positioning plate (10); A coolant storage tank (7) is installed on both sides below the oxidation furnace body (1); a delivery pipe (9) is installed on the outer side of the coolant storage tank (7); one end of the delivery pipe (9) is connected to a lifting pump (8); a water collecting tank (13) is arranged below the lifting pump (8); and a furnace door (12) is installed at one end of the oxidation furnace body (1).

2. A sectional formaldehyde production oxidation furnace quenching device according to claim 1, characterized in that: The oxidation furnace body (1) is also provided with: The gas exhaust port (6) is arranged on both sides above the oxidation furnace body (1), and the gas inlet interface (2) is connected to the gas exhaust port (6) through the oxidation furnace body (1).

3. A sectional formaldehyde production oxidation furnace quenching device according to claim 1, characterized in that: The cooling liquid storage tank (7) is symmetrically distributed about the vertical center line of the oxidation furnace body (1), and the cooling liquid storage tank (7) forms a communication structure with the water collecting tank (13) through the delivery pipeline (9) and the lifting pump (8).

4. A sectional formaldehyde production oxidation furnace quenching device according to claim 1, characterized in that: The water collecting tank (13) is connected to the cooling tubes (3) via the connecting pipe (5) and the expansion joint (4), and the connecting pipe (5) corresponds to the cooling tubes (3) one by one.

5. A sectional formaldehyde production oxidation furnace quenching device according to claim 1, characterized in that: The cooling tubes (3) are interconnected with the cooling liquid storage tank (7), and the cooling tubes (3) are symmetrically distributed with respect to the vertical center line of the oxidation furnace body (1).

6. A sectional formaldehyde production oxidation furnace quenching device according to claim 1, characterized in that: The connecting pipe (5) is fixedly connected to the positioning plate (10), and the positioning plate (10) is detachably connected to the expansion joint (4) via positioning bolts (11).

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