On-line defoaming equipment for trioxymethylene reactor

Abstract

An on-line defoaming device for a trioxymethylene reactor relates to the field of defoaming devices and comprises an outer shell, a liquid outlet pipe is arranged at the bottom of the outer shell, a gas outlet pipe is arranged at the top of the outer shell and connected with a gas guide pipe, a gas inlet pipe is arranged on the side wall of the outer shell and communicated with a trioxymethylene reaction kettle, and a gas outlet pipe is arranged on the gas guide pipe. A filter screen assembly is arranged in the outer shell, and a flushing assembly is arranged at the top in the outer shell. According to the invention, the problem of sulfuric acid entrainment in the gas phase of the TOX synthesis reaction kettle in the trioxymethylene production process is effectively solved, the loss of the catalyst is obviously reduced, the service life of equipment is prolonged, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of defoaming equipment, and in particular to an online defoaming equipment for a trioxymethylene reactor. Background Art

[0002] In the production process of polymer-grade trioxymethylene, a key link is to concentrate a 45% formaldehyde solution in a TOX reactor through the catalytic action of sulfuric acid and convert it into a 70% formaldehyde solution. In this process, formaldehyde further reacts under specific reaction conditions to generate a gas phase product containing about 15% trioxymethylene. The gas phase product is then sent to a synthetic distillation tower, and after a series of extraction distillation and refining steps, a trioxymethylene product that meets polymer-grade standards is finally obtained.

[0003] However, the existing production process faces a significant technical challenge: the gas phase produced by the TOX synthesis reactor carries a large amount of sulfuric acid, with the entrainment amount reaching about 55kg / h. This high-content sulfuric acid gas phase can easily cause serious corrosion to the equipment and structures in the tower when entering the synthetic distillation tower. This corrosion will not only lead to the loss of catalysts, affect the efficiency of the reaction and the purity of the product, but also significantly reduce the service life of the equipment, increase production maintenance costs and downtime. Therefore, in view of the problem of high sulfuric acid entrainment in the gas phase of the TOX reactor and easy corrosion of subsequent equipment, it is urgent to develop an effective solution to optimize the production process of trioxymethylene, improve the corrosion resistance of the equipment and the stability of the catalyst, so as to ensure the continuity of the production process and the stability of product quality. Summary of the invention

[0004] The purpose of the present invention is to solve the problems raised in the above background technology, and then proposes an online defoaming device for a trioxymethylene reactor.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] An online defoaming device for a trioxymethylene reactor comprises an outer shell, a liquid outlet pipe is provided at the bottom of the outer shell, an air outlet pipe is provided at the top of the outer shell, the air outlet pipe is connected to an air guide pipe, an air inlet pipe is provided on the side wall of the outer shell, wherein the air inlet pipe is connected to the trioxymethylene reactor, a filter screen assembly is provided in the outer shell, and a flushing assembly is provided at the top of the outer shell.

[0007] Furthermore, the air inlet pipe is provided with a first valve, and the air guide pipe is provided with a second valve.

[0008] Furthermore, the outer shell includes an upper shell and a lower shell, a liquid outlet pipe is provided at the bottom of the lower shell, a plurality of legs are provided on the lower shell, a lower flange is provided on the lower shell, an upper flange is provided at the bottom of the upper shell, the upper flange and the lower flange are fastened and fixed by bolts and nuts, and a filter screen assembly is provided between the upper flange and the lower flange.

[0009] Furthermore, the filter screen assembly includes a mounting ring, a screen is provided in the middle of the mounting ring, and a plurality of positioning mounting holes are provided on the mounting ring.

[0010] Furthermore, the flushing assembly includes a flushing pipe, a mounting hole is provided at the top of the upper shell, and the flushing pipe is connected to a hemispherical flushing plate after being inserted into the mounting hole. A plurality of spray nozzles are provided at the bottom of the hemispherical flushing plate, and the hemispherical flushing plate is fixedly connected to the upper shell by a clamp.

[0011] Furthermore, a central through hole is formed in the middle of the hemispherical flushing disk.

[0012] Furthermore, a secondary line connecting pipe is provided between the air intake pipe and the air guide pipe, and a third valve and a fourth valve are provided at both ends of the secondary line connecting pipe respectively.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention effectively solves the problem of sulfuric acid entrainment in the gas phase of the TOX synthesis reactor in the trioxane production process, significantly reduces the loss of catalysts, prolongs the service life of the equipment, and improves production efficiency. Through the filtering effect of the filter mesh assembly, the sulfuric acid droplets entrained in the gas phase at the top of the reactor are reduced, the production increase demand is met, and the corrosion risk of the subsequent distillation tower is reduced. At the same time, the equipment has a simple structure, is easy to operate, and is easy to maintain and overhaul, which provides a strong guarantee for the stable operation of the trioxane production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the filter screen assembly;

[0016] Figure 3 It is a structural schematic diagram of the upper shell;

[0017] Figure 4 It is a schematic diagram of the structure of the flushing component;

[0018] Wherein: 1 outer shell, 11 upper shell, 111 upper flange, 112 air outlet pipe, 12 lower shell, 121 lower flange, 122 supporting leg, 123 liquid outlet pipe, 2 filter screen assembly, 21 mounting ring, 22 positioning mounting hole, 31 air inlet pipe, 32 secondary line connecting pipe, 34 air guide pipe, 35 first valve, 36 third valve, 37 fourth valve, 38 second valve, 4 flushing assembly, 41 flushing pipe, 43 hemispherical flushing plate, 431 center through hole, 45 spray nozzle, 44 clamp. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention is further described in combination with the drawings and embodiments:

[0020] like Figure 1-Figure 4 As shown, an online defoaming device for a trioxymethylene reactor comprises an outer shell 1, a liquid outlet pipe 123 is provided at the bottom of the outer shell, and the liquid in the liquid outlet pipe can flow back into the trioxymethylene reactor, thereby improving the utilization rate of resources. An air outlet pipe 112 is provided at the top of the outer shell, and the air outlet pipe is connected to an air guide pipe 34. An air inlet pipe 31 is provided on the side wall of the outer shell, wherein the air inlet pipe is connected to the trioxymethylene reactor and is used to introduce the gas phase to be treated, thereby realizing direct docking with the reactor. A filter screen assembly 2 is provided in the outer shell, and a flushing assembly 4 is provided at the top of the outer shell, which is convenient for cleaning the filter screen assembly and prolongs the service life of the equipment.

[0021] Furthermore, the air inlet pipe is provided with a first valve 35 for controlling the air inlet flow rate, so as to facilitate adjustment according to production requirements. The air guide pipe is provided with a second valve 38 for controlling the air outlet flow rate, so as to ensure the stable operation of the equipment.

[0022] In at least one embodiment, the outer shell includes an upper shell 11 and a lower shell 12. This split design facilitates the installation and maintenance of the equipment and reduces maintenance costs. A liquid outlet pipe 123 is provided at the bottom of the lower shell for discharging the filtered liquid, thereby achieving effective recovery of the liquid. A plurality of legs 122 are provided on the lower shell for supporting the equipment to ensure the stability of the equipment. A lower flange 121 is provided on the lower shell, and an upper flange 111 is provided at the bottom of the upper shell. The upper flange is fixed to the lower flange by bolts and nuts, and a filter screen assembly 2 is provided between the upper flange and the lower flange.

[0023] Further, such as Figure 2As shown, the filter screen assembly includes a mounting ring 21, a screen 23 is provided in the middle of the mounting ring, and a plurality of positioning mounting holes 22 are provided on the mounting ring.

[0024] In at least one embodiment, the flushing assembly includes a flushing pipe 41, a mounting hole is provided at the top of the upper shell, and the flushing pipe is connected to a hemispherical flushing plate 43 after being inserted into the mounting hole. A plurality of spray nozzles 45 are provided at the bottom of the hemispherical flushing plate for spraying flushing liquid to facilitate thorough cleaning of the filter screen assembly. The hemispherical flushing plate is fixedly connected to the upper shell by a clamp 44. This connection method is simple and reliable, and ensures the stability of the flushing assembly.

[0025] A central through hole 431 is formed in the middle of the hemispherical flushing disk. The design of the central through hole enables the gas outlet pipe to communicate with the inside of the outer shell, ensuring smooth outlet of the gas phase.

[0026] In at least one embodiment, a secondary line connecting pipe 32 is provided between the air inlet pipe and the air guide pipe, and a third valve 36 and a fourth valve 37 are provided at both ends of the secondary line connecting pipe, respectively, for cutting off the airflow when the system is running, thereby facilitating the inspection and maintenance of the demister and improving the maintainability and operation efficiency of the equipment.

[0027] Working method: install the outer shell 1 near the trioxymethylene reactor to ensure that the air inlet pipe 31 is connected to the trioxymethylene reactor. Connect the air duct 34 to the air outlet pipe 112 at the top of the outer shell to ensure smooth airflow. Install the filter screen assembly 2 between the upper flange 111 and the lower flange 121, and tighten and fix it with bolts and nuts. Install the flushing assembly 4 on the top of the upper shell to ensure that the spray nozzle 45 at the bottom of the hemispherical flushing plate 43 is aligned with the filter screen assembly 2. Set a first valve 35 on the air inlet pipe 31, set a second valve 38 on the air duct 34, and set a third valve 36 and a fourth valve 37 at both ends of the secondary line connecting pipe 32, which are used to cut off the airflow when the system is running, so as to facilitate the inspection and maintenance of the defoamer. Open the first valve 35 to allow the gas phase in the trioxymethylene reactor to enter the outer shell 1. When the gas phase passes through the filter screen assembly 2, a portion of the sulfuric acid is filtered out, reducing the sulfuric acid droplets entrained in the top gas phase of the kettle, meeting the production increase demand, and reducing the corrosion of the subsequent distillation tower. The filtered gas phase enters the subsequent equipment through the gas outlet pipe 112 and the air guide pipe 34. Check and clean the filter screen assembly 2 regularly to prevent clogging. When cleaning, open the spray nozzle 45 of the flushing assembly 4 and flush the filter screen assembly 2 with cleaning fluid. When the demister needs to be repaired, close the first valve 35 and the second valve 38, open the third valve 36 and the fourth valve 37, keep the system running continuously, and perform maintenance work at the same time.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An online defoaming device for a trioxymethylene reactor, characterized in that: It includes an outer shell, a liquid outlet pipe is provided at the bottom of the outer shell, an air outlet pipe is provided at the top of the outer shell, the air outlet pipe is connected to an air guide pipe, an air inlet pipe is provided on the side wall of the outer shell, wherein the air inlet pipe is connected to a trioxymethylene reactor, a filter screen assembly is provided in the outer shell, and a flushing assembly is provided at the top of the outer shell.

2. The online defoaming equipment for trioxymethylene reactor according to claim 1, characterized in that: The air inlet pipe is provided with a first valve, and the air guide pipe is provided with a second valve.

3. The online defoaming equipment for trioxymethylene reactor according to claim 1 or 2, characterized in that: The outer shell includes an upper shell and a lower shell, a liquid outlet pipe is provided at the bottom of the lower shell, a plurality of legs are provided on the lower shell, a lower flange is provided on the lower shell, an upper flange is provided at the bottom of the upper shell, the upper flange and the lower flange are fastened and fixed by bolts and nuts, and a filter screen assembly is provided between the upper flange and the lower flange.

4. The online defoaming equipment for trioxymethylene reactor according to claim 3, characterized in that: The filter screen assembly comprises a mounting ring, a screen is arranged in the middle of the mounting ring, and a plurality of positioning mounting holes are arranged on the mounting ring.

5. The online defoaming equipment for trioxymethylene reactor according to claim 4, characterized in that: The flushing assembly includes a flushing pipe, a mounting hole is provided on the top of the upper shell, the flushing pipe is inserted into the mounting hole and connected to a hemispherical flushing plate, a plurality of spray nozzles are provided at the bottom of the hemispherical flushing plate, and the hemispherical flushing plate is fixedly connected to the upper shell by a clamp.

6. The online defoaming equipment for trioxymethylene reactor according to claim 5, characterized in that: A central through hole is formed in the middle of the hemispherical flushing disk.

7. The online defoaming equipment for trioxymethylene reactor according to claim 1, characterized in that: A secondary line connecting pipe is arranged between the air intake pipe and the air guide pipe, and a third valve and a fourth valve are arranged at two ends of the secondary line connecting pipe respectively.

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