Low-pressure method melamine trap anti-blocking type high-efficiency pressure screw discharge tank

Abstract

The utility model discloses a low pressure method melamine trap prevents high -efficient pressure spiral discharging tank of type of blocking, including jar body, crushing device and fluidization device. Crushing device is located at jar body top, contains spiral valve stem, five edge drill bit, operating mechanism, valve cover and half ball valve body, is used for crushing, rolling in the jar agglomeration. Fluidization device contains two groups of purging gas pipeline, is arranged respectively in the east and west both sides of jar body cone middle part and lower part, is used for fluidization broken material. When the melamine agglomeration of crystallizer or trap collapse causes and blocks pressure spiral conveyor outlet jar cone, influences material delivery, drives crushing device to break agglomeration, opens purging gas of fluidization device simultaneously, makes material fluidization and smooth delivery. The utility model has realized the mechanization handling of blocking, avoided the high temperature scald, toxic gas poisoning risk and environmental pollution of manual dredging, improved system operation stability and operating safety significantly.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, specifically to a high-efficiency discharge tank used in the low-pressure melamine production process to prevent blockage of the outlet tank of the pressure screw conveyor of the collector due to the collapse and agglomeration of the crystallizer or collector. Background Technology

[0002] In the low-pressure melamine production process, see Appendix Figure 4 The hot process gas containing melamine is quenched and crystallized in the crystallizer (1) by countercurrent contact with cold gas. The resulting melamine powder enters the collector (2), is separated by cyclone separation, and accumulates at its bottom. It is then transported to the discharge tank (3') by scraper (201), agitator (202), and pressure screw conveyor (203), and finally sent to the packaging line (5) by Roots blower (4) for sealing. Due to the process characteristics, melamine tends to form walls on the upper part of the crystallizer (1) and collector (2), and collapses frequently occur. Large pieces of material falling from the collapse can easily block the cone part of the discharge tank (3') of the pressure screw conveyor (203) of the collector, causing the material to be unable to be transported normally. If not dealt with in time, the material will continue to accumulate in the collector (2), which will cause the scraper (201) to trip, forcing the system to reduce load or even stop.

[0003] In existing technologies, when dealing with blockages, operators need to repeatedly poke and clear the blockage at the drain valve (6) at the bottom of the discharge tank (3') using a long, thin steel tool. This process poses serious safety hazards: the high-temperature (approximately 208-220℃) melamine material may splash and cause burns to operators; at the same time, the process gases (mainly ammonia, carbon dioxide, etc.) accompanying the material leakage pose a risk of poisoning to operators. In addition, the melamine dust released during the process will cause environmental pollution. Therefore, the existing discharge tank (3') is prone to blockage, and the blockage handling method poses significant safety and environmental hazards, threatening the stable operation of the system. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a low-pressure melamine trap anti-clogging high-efficiency pressure screw discharge tank. It aims to solve the problem of melamine agglomeration clogging the pressure screw conveyor outlet tank cone caused by the collapse of the crystallizer or trap, avoid the system fluctuations caused by this, and eliminate the safety and environmental risks caused by manual unblocking.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a low-pressure melamine trap anti-clogging type high-efficiency pressure spiral discharge tank, including a tank body (301), and further including: a crushing device (302), the crushing device (302) including: a rotary valve rod (302-1), which penetrates into the tank body (301) and its length can extend to the upper edge of the tank body cone; a five-sided drill bit (302-2), which is fixedly connected to the lower end of the spiral valve rod (302-1) and its length corresponds to the height of the tank body (301 cone); an operating mechanism (302-3), which is connected to the spiral valve rod (302-1); and a valve cover. (302-4), located below the operating mechanism (302-3), is used to support the operating mechanism (302-3) and accommodate the spiral valve stem (302-1) and sealing components, and to press the packing to prevent material leakage; the hemispherical valve body (302-5), connected below the valve cover (302-4) and welded to the top of the tank body (301), is used to fix the entire crushing device (302); the fluidization device (303) includes two sets of purge gas pipelines, located in the lower part of the tank body (301), and each purge gas pipeline is directly inserted into the tank body (301) from multiple directions.

[0006] Furthermore, the spiral valve stem (302-1) is made of high-temperature resistant and corrosion-resistant stainless steel.

[0007] Furthermore, the two sets of purge gas lines of the fluidization device (303) are specifically: the first set includes two purge gas lines, which are respectively set on the east and west sides of the middle part of the cone of the tank (301); the second set includes two purge gas lines, which are respectively set on the east and west sides of the lower part of the cone of the tank (301).

[0008] Furthermore, the purging gas pipeline is made of stainless steel with a diameter of φ38×3mm.

[0009] The beneficial effects of this utility model are as follows:

[0010] 1. High inherent safety: The blockage treatment is completed mechanically in the sealed tank (301), which completely avoids the high-risk material handling operation of the operator at the drain valve (6) and eliminates the risk of burns from high-temperature material splashing.

[0011] 2. Prevention of poisoning risk: The closed treatment method prevents the leakage and diffusion of toxic process gases (such as ammonia and carbon dioxide) escaping from the trap during the treatment process, reducing the risk of poisoning to operators.

[0012] 3. Good environmental performance: The treatment process is carried out inside the tank, which effectively prevents melamine dust and harmful gases from spreading and polluting the site and surrounding environment.

[0013] 4. Easy to operate and stable system: The blockage can be quickly cleared by driving the crusher and switching the purging air through the operating mechanism (302-3). The process is rapid and standardized, which significantly reduces the fluctuations caused to the melamine production system and improves the stability of system operation. Attached Figure Description

[0014] Figure 1 : A schematic diagram of the structure of the anti-clogging high-efficiency pressure spiral discharge tank of this utility model.

[0015] Figure 2 : Figure 1 The diagram shows a cross-sectional view of the discharge tank.

[0016] Figure 3 : Figure 1 A schematic diagram of the pentaangular drill bit (302-2) in the discharge tank is shown.

[0017] Figure 4 : Flow diagram of the pressure screw discharge tank in the low-pressure melamine process.

[0018] The markings in the diagram are as follows: 1. Crystallizer; 2. Collector; 3′. Discharge tank; 4. Roots blower; 5. Packaging line; 6. Drain valve; 201. Scraper; 202. Agitator; 203. Pressure screw conveyor; 301. Tank body; 302. Crushing device; 302-1. Spiral valve stem; 302-2. Pentagonal drill bit; 302-3. Operating mechanism; 302-4. Valve cover; 302-5. Hemispherical valve body; 303. Fluidization device. Detailed Implementation

[0019] The technical solution of the gas-liquid distribution and guiding device in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] Taking the applicant's actual application of the low-pressure melamine production equipment as an example, the core improvement of this utility model's low-pressure melamine trap anti-clogging high-efficiency pressure spiral discharge tank lies in the addition of a crushing device 302 and the optimized arrangement of a fluidizing device 303.

[0021] The crushing device 302 is installed on the top of the tank 301. It includes a spiral valve stem 302-1, a pentagonal drill bit 302-2, an operating mechanism 302-3, and a valve cover 302-4. The spiral valve stem 302-1 is a screw made of high-temperature and corrosion-resistant stainless steel (such as 304). The nut meshing with the spiral valve stem 302-1 is fixedly mounted on the valve cover 302-4 using a bracket, similar to the internal thread operating mechanism of a gate valve in the prior art. The pentagonal drill bit 302-2 is coaxially mounted on the lower end of the spiral valve stem 302-1. This pentagonal drill bit 302-2 is welded and fixed to the bottom end of the spiral valve stem 302-1, and its length matches the height of the cone-shaped body of the tank 301. It effectively crushes and grinds agglomerates using its edges and rotational and downward pressing actions. The length of the spiral valve stem 302-1 ensures that the pentagonal drill bit 302-2 can reach the bottom of the cone-shaped body of the tank 301. The operating mechanism 302-3 can be driven by a handwheel or a motor. It is connected to the upper end of the valve stem 302-1 and is used to drive the valve stem to rotate and move up and down. The valve cover 302-4 is located below the operating mechanism. A precise through hole is machined in the center of the valve cover 302-4 to provide axial guidance for the up-and-down movement of the valve stem 302-1. A stuffing box is designed on the upper part of the valve cover to accommodate sealing packing. The valve stem passes through the stuffing box to ensure that there is no leakage of material or gas inside the tank during operation. The hemispherical valve body 302-5 is connected to the valve cover 302-4 and welded to the top flange of the tank body 301, providing a stable mounting base and channel for the entire crushing device. The hemispherical valve body serves as the static foundation and flow channel carrier, the valve cover as the top sealing element, guide seat, and stuffing box carrier, and the valve stem as the motion transmission and power output component. These three components work together through precise mechanical connections and sealing design.

[0022] The fluidization device 303 is integrated into the cone section of the tank body 301: The fluidization device 303 includes a total of four purge gas lines, configured in two layers. The upper layer consists of two φ38×3mm stainless steel purge pipes, which are horizontally and symmetrically installed on the east and west side walls at the middle height of the cone section of the tank body 301.

[0023] The lower group consists of two φ38×3mm stainless steel purge pipes, horizontally and symmetrically installed on the east and west side walls of the 301 cone of the tank near the bottom. The purge gas source is usually low-pressure nitrogen or process inert gas, and the pipeline leads directly into the tank.

[0024] Working process: When crystallizer 1 or collector 2 collapses, large pieces of melamine material fall into the pressure screw discharge tank 301 and become blocked at its cone section:

[0025] 1. Operators do not need to go to the drain valve 6.

[0026] 2. At the tank-side operating station, drive the operating mechanism 302-3 of the crushing device 302, control the spiral valve rod 302-1 to drive the five-sided drill bit 302-2 to rotate and move downward, crushing and crushing the lumps in the cone part.

[0027] 3. Simultaneously or subsequently, open the upper and lower sets of purge gas valves of the fluidization device 303, so that gas is injected into the cone area inside the tank from four points, and the crushed melamine material is fully fluidized.

[0028] 4. The combined action of crushing and fluidization quickly clears blockages, restores material flow, and ultimately allows the material to pass smoothly through the pressure screw conveyor 203 for normal conveying.

[0029] Implementation Results: This embodiment has verified the effectiveness and practicality of this utility model in actual production.

[0030] Safety Enhancement: It completely replaces the high-risk manual material handling operation, fundamentally eliminating the risk of high-temperature burns and toxic gas poisoning.

[0031] Environmental improvements: The treatment process is carried out in a sealed tank, which effectively prevents the leakage of dust (melamine) and harmful gases (NH3, CO2), resulting in a significant improvement in the on-site environment.

[0032] Efficiency and stability: Mechanized processing is simple, fast, and standardized, and can clear blockages in a short time, greatly reducing system downtime or shutdown caused by blockages, and significantly improving the operating efficiency and stability of the production line.

Claims

1. A low-pressure melamine trap anti-clogging type high-efficiency pressure screw discharge tank, comprising a tank body (301), characterized in that, Also includes: A crushing device (302) includes: a spiral valve stem (302-1) that penetrates into the tank (301) and extends to the upper edge of the tank cone; a five-sided drill bit (302-2) that is fixedly connected to the lower end of the spiral valve stem (302-1) and whose length corresponds to the height of the tank cone (301); and an operating mechanism (302-3) that is connected to the spiral valve stem (302-1). A valve cover (302-4) is located below the operating mechanism (302-3) to support the operating mechanism (302-3) and to house the spiral valve stem (302-1) and sealing components, and to press the packing to prevent material leakage; a hemispherical valve body (302-5) is connected below the valve cover (302-4) and welded to the top of the tank body (301) to fix the entire crushing device (302); The fluidization device (303) includes two sets of purge gas lines, which are located in the lower part of the tank (301). Each purge gas line is directly inserted into the tank (301) from multiple directions.

2. The low-pressure melamine trap anti-clogging high-efficiency pressure screw discharge tank according to claim 1, characterized in that, The spiral valve stem (302-1) is made of high-temperature resistant and corrosion-resistant stainless steel.

3. The low-pressure melamine trap anti-clogging high-efficiency pressure screw discharge tank according to claim 1, characterized in that, The two sets of purge gas pipelines of the fluidization device (303) are as follows: The first set includes two purge gas pipelines, which are respectively located on the east and west sides of the middle part of the cone of the tank (301); The second group includes two purge gas pipelines, which are respectively located on the east and west sides of the lower part of the cone of the tank (301).

4. The low-pressure melamine trap anti-clogging high-efficiency pressure screw discharge tank according to claim 3, characterized in that, The purging gas pipeline is made of stainless steel pipe with a diameter of φ38×3mm.

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