Automatic scar cleaning device for compound fertilizer system

Abstract

The technical problem to be solved by the utility model is to provide the automatic scabbing cleaning device for the compound fertilizer system, upward splashing materials are prevented from scabbing at the top of the mixing tank and the upper section of the stirring shaft through the protective cover, the scabbing in the mixing tank can be periodically purged by the purging pipe assembly, the labor intensity of personnel and the operation risk are reduced, and the working efficiency is improved. The system comprises a protective cover, a heat tracing steam pipeline, a purging steam pipeline, a condensate outlet pipe and a purging pipe assembly. The protective cover is arranged in a shell of the mixing tank, a center hole allowing the stirring shaft to penetrate through is formed in the center of the protective cover, an interlayer cavity is formed in the protective cover, and the heat tracing steam pipeline and the condensate outlet pipe are respectively communicated with the interlayer cavity of the protective cover; the purging pipe assembly is arranged on the outer surface of the protective cover and comprises at least one outer purging pipe and at least one inner purging pipe.

Description

Technical Field

[0001] The utility model relates to the field of fertilizer production equipment, in particular to a compound fertilizer production system, and specifically to an automatic cleaning device for scarring of a compound fertilizer system. Background Art

[0002] The high tower melt granulation nitro compound fertilizer production line is mainly composed of a melter, a mixing tank, a homogenizer, a granulator, and a granulation tower. A typical production process is: liquid ammonium nitrate with a concentration of 99% is transported to the ammonium nitrate intermediate tank by a special pump, and the ammonium nitrate solution in the intermediate tank and the production return material are simultaneously transported to the melter and fully melted in the melter; the mixed liquid flowing out of the melter is mixed with potassium sulfate and potassium chloride powder in the 1# mixing tank to form a slurry; then overflows to the 2# mixing tank, and forms a nitro compound fertilizer slurry with the monoammonium phosphate and potassium dihydrogen phosphate powder added to the 2# mixing tank; then it is sprayed through the granulator and cooled in the granulation tower to form a granular nitro compound fertilizer.

[0003] In this production process, since the solid materials entering the mixing tank account for 30%-60%, the solid phase volume is large, and the slurry is viscous, it is easy to form scars on the mixing tank wall (top) and around the mixing shaft under the action of stirring. If the scars are not handled in time, they will slowly "grow" and fall off when they are large enough, causing the mixing to stop at the least, and even causing production interruption at the worst, which has a great impact on the stability of production operations. The usual practice in the industry is for operators to regularly observe the scarring in the mixing tank. In the early stage of scar formation, stainless steel pipes, iron sticks and other tools are used to clean the scars, but this behavior is time-consuming and labor-intensive and has the following risks: the risk of burns caused by contact with high-temperature mixed solutions, the risk of tools falling into the mixing tank during operation, and the risk of objects hitting the mixing tank due to stirring. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an automatic cleaning device for compound fertilizer system scarring, which prevents upwardly splashed materials from scarring on the top of the mixing tank and the upper section of the stirring shaft through a protective cover, and the purge pipe assembly can regularly purge the scarring in the mixing tank, thereby reducing the labor intensity and operation risks of personnel and improving the operation stability of the system.

[0005] The utility model is realized by the following technical solutions:

[0006] An automatic cleaning device for compound fertilizer system scarring, comprising a protective cover, a heating steam pipeline, a purge steam pipeline, a condensate outlet pipe and a purge pipe assembly;

[0007] The protective cover is arranged in the shell of the mixing tank, a central hole is arranged at the center of the protective cover to allow the stirring shaft to pass through, an interlayer cavity is arranged in the protective cover, and the heating steam pipeline and the condensate outlet pipe are respectively connected to the interlayer cavity of the protective cover;

[0008] The purge pipe assembly is arranged on the outer surface of the protective cover, and the purge pipe assembly includes at least one outer purge pipe and an inner purge pipe, and the inlet ends of the outer purge pipe and the inner purge pipe are connected to the purge steam pipeline;

[0009] The purge port of the outer purge pipe faces the inner wall of the mixing tank, and the purge port of the inner purge pipe faces the stirring shaft.

[0010] Furthermore, the protective cover is a truncated cone-shaped structure, a steam coil is arranged in the interlayer cavity, and the heating steam pipeline and the condensate outlet pipe are respectively connected to the inlet and outlet of the steam coil.

[0011] Furthermore, the number of the external purge pipes is three, and the purge ports of the external purge pipes are evenly arranged at intervals of 60° along the outer edge of the protective cover;

[0012] The number of the inner purge pipe is one, and the purge port of the inner purge pipe is arranged on the inner edge of the protective cover and obliquely downward toward the stirring shaft.

[0013] Furthermore, the purge ports are all flat fan-shaped nozzles.

[0014] Furthermore, the inlet of the purge steam pipeline is located outside the mixing tank and connected to the steam source, the inlet of the heating steam pipeline is located outside the mixing tank and connected to the side wall of the heating steam pipeline through a purge valve, and a heating steam valve is also provided on the heating steam pipeline.

[0015] A method for automatically cleaning compound fertilizer system scars, using the compound fertilizer system scar automatic cleaning device of the utility model to clean the scars in the mixing tank, comprising the following steps:

[0016] S01. The protective cover is located above the material level, and purge pipe assemblies are provided on both sides of the protective cover;

[0017] S02. The mixing tank works normally, and the heating steam is introduced into the heating steam pipeline. The steam enters the protective cover to heat up the protective cover. The temperature of the protective cover is higher than the melting point of the liquid material. The material splashed upward will not form scars on the protective cover but will naturally flow back to the mixed sauce under the action of gravity;

[0018] S03. The condensed water after the heating steam is condensed in the protective cover is transported to the condensed water tank through the condensate outlet pipe;

[0019] S04. Clean the scars of the purge pipe assembly regularly;

[0020] When the purge pipe assembly is cleaning the scars, the heating steam stops entering the protective cover, and the heating steam enters the purge steam pipeline, and then enters the purge pipe assembly. The heating steam is sprayed to the inner wall of the mixing tank through the outer purge pipe and to the stirring shaft through the inner purge pipe. The scars on the inner wall of the mixing tank and the stirring shaft are cut and melted under the action of steam pressure and temperature, and naturally flow into the mixed slurry under the action of gravity.

[0021] Furthermore, the purge time interval of the purge pipe assembly is set to 5-10 minutes, and each purge time is 2-5 minutes.

[0022] Compared with the prior art, the beneficial effects achieved by the utility model are as follows:

[0023] 1. Through the automatic cleaning device for compound fertilizer system scarring described in the utility model, heating steam is introduced into the protective cover to make the temperature of the protective cover higher than the melting point of the material. The protective cover prevents the upwardly splashed material from scarring at the top of the mixing tank and the upper section of the stirring shaft. The purge pipe assembly can regularly introduce steam to purge the scarring in the mixing tank, thereby reducing the labor intensity and operation risks of personnel and improving the operation stability of the system;

[0024] 2. Through the automatic cleaning method for compound fertilizer system scarring described in the utility model, the purge pipe assembly is introduced with heated steam, which can regularly clean the scarring on the inner wall of the mixing tank and the stirring shaft. At the same time, the steam will not affect the material after entering the material, which greatly reduces the labor intensity and operation risk of personnel;

[0025] 3. A steam coil is arranged in the interlayer cavity of the protective cover. After the heating steam enters the steam coil, the protective cover can be quickly heated up, and the condensed water can be directly discharged to avoid the accumulation of condensed water in the protective cover;

[0026] 4. The purge ports are all flat fan-shaped nozzles, which can increase the pressure of steam spray, increase the purge coverage area, and increase the steam outlet flow rate to enhance the purge effect, thereby facilitating cutting and melting scars;

[0027] 5. A heating steam valve is also installed on the heating steam pipeline to prevent a large amount of condensed water from entering the material through the purge pipe assembly and affecting the quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the automatic cleaning device for compound fertilizer system scars according to the utility model;

[0029] Figure 2 It is a schematic diagram of the protective cover and the purge pipe assembly described in the utility model;

[0030] Figure 3 This is a schematic diagram of the interior of the protective cover described in the utility model;

[0031] In the figure: 1, protective cover, 2, heating steam pipeline, 3, purge steam pipeline, 4, condensate outlet pipe, 5, heating steam valve, 6, steam coil, 7, mixing tank, 8, stirring shaft, 9, external purge pipe, 10, internal purge pipe, 11, purge valve. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the description of the utility model, it should be understood that the terms "front", "rear", "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the utility model. The utility model is further described below in conjunction with the drawings and embodiments.

[0034] like Figure 1-3 As shown, this embodiment discloses an automatic cleaning device for compound fertilizer system scars, including a protective cover 1, a heating steam pipeline 2, a purge steam pipeline 3, a condensate outlet pipe 4 and a purge pipe assembly. The inlet of the purge steam pipeline 3 is located outside the mixing tank and connected to the steam source, the inlet of the heating steam pipeline 2 is located outside the mixing tank and connected to the side wall of the heating steam pipeline 2 through a purge valve 11, and a heating steam valve 5 is also provided on the heating steam pipeline 2. When the heating steam valve 5 is closed and the purge valve 11 is opened, the heating steam can all enter the purge steam pipeline 3.

[0035] The protective cover 1 is located in the shell of the mixing tank 7. The protective cover 1 is a truncated cone structure. A center hole is processed at the center of the protective cover 1 to allow the stirring shaft 8 to pass through. The protective cover 1 is fixed to the top inner wall of the mixing tank through a connecting plate. An interlayer cavity is provided in the protective cover 1. The interlayer cavity is provided with a steam coil 6. The heating steam pipeline 2 and the condensate outlet pipe 4 are connected to the inlet and outlet of the steam coil 6 respectively. The outlet of the condensate outlet pipe 4 is located outside the mixing tank and is connected to the steam trap and the condensate tank in sequence. With such a design, when the heating steam enters the steam coil 6 in the protective cover 1, the protective cover 1 can be quickly heated up.

[0036] The purge pipe assembly is arranged on the outer surface of the protective cover 1. In this embodiment, the purge pipe assembly includes three outer purge pipes 9 and one inner purge pipe 10. The inlet ends of the outer purge pipes 9 and the inner purge pipes 10 are connected to the purge steam pipeline 3. The purge ports of the outer purge pipes 9 are evenly arranged at intervals of 60° along the outer edge of the protective cover 1, so that the purge ports of the outer purge pipes 9 face the inner side wall of the mixing tank, and the purge ports of the inner purge pipes 10 are arranged on the inner edge of the protective cover 1 and obliquely downward toward the stirring shaft 8, so that the purge ports of the inner purge pipes 10 face the part of the stirring shaft 8 located below the protective cover 1. In this embodiment, the purge ports are all flat fan-shaped nozzles, so that the steam can be pressurized and have a fan-shaped injection surface.

[0037] Based on the above-mentioned automatic cleaning device for compound fertilizer system scars, this embodiment also provides an automatic cleaning method for compound fertilizer system scars, comprising the following steps:

[0038] S01, the protective cover 1 is located above the material liquid level, and the left and right sides of the protective cover 1 are equipped with purge pipe assemblies;

[0039] S02, the mixing tank works normally, the hot steam valve is opened, the purge valve 11 is closed, the heating steam is introduced into the heating steam pipeline 2, and the steam enters the protective cover 1 to heat the protective cover 1. The temperature of the protective cover 1 is higher than the melting point of the liquid material, and the material splashed upward will not form scars on the protective cover 1 but will naturally flow back to the mixed sauce under the action of gravity;

[0040] S03, the condensed water after the heating steam is condensed in the protective cover 1 is transported to the condensed water tank through the condensate outlet pipe 4;

[0041] S04. The purge pipe assembly is cleaned of scars regularly. The purge interval is set to 5-10 minutes according to the scar formation speed under different conditions such as compound fertilizer production type, raw materials, temperature, etc., and the purge time is 2-5 minutes each time;

[0042] When the purge pipe assembly is cleaning the scars, the heating steam valve 5 is closed, the purge valve 11 is opened, the heating steam stops entering the protective cover 1, the heating steam enters the purge steam pipeline 3, and then enters the purge pipe assembly, the heating steam is sprayed to the inner wall of the mixing tank through the outer purge pipe 9, and sprayed to the stirring shaft 8 through the inner purge pipe 10, the scars on the inner wall of the mixing tank and the stirring shaft 8 are cut and melted under the action of steam pressure and temperature, and naturally flow into the mixed slurry under the action of gravity;

[0043] After purging for 2-5 minutes, the purge valve 115 is closed, the heating steam valve 5 is opened, and the automatic cleaning device for scars in the compound fertilizer system returns to the stopped state.

[0044] In some embodiments, the number of purge ports and external purge pipes 9 should be increased or decreased according to actual conditions to ensure the effectiveness of steam purge coverage; each purge valve 11 can be opened at different times to increase steam purge pressure and temperature. The purge pipe assembly can regularly pass steam to purge the scabs in the mixing tank, reduce labor intensity and operation risks, and improve system operation stability.

Claims

1. An automatic cleaning device for compound fertilizer system scarring, characterized in that: Includes protective cover, heating steam line, purge steam line, condensate outlet pipe and purge pipe assembly; The protective cover is arranged in the shell of the mixing tank, a central hole is arranged at the center of the protective cover to allow the stirring shaft to pass through, an interlayer cavity is arranged in the protective cover, and the heating steam pipeline and the condensate outlet pipe are respectively connected to the interlayer cavity of the protective cover; The purge pipe assembly is arranged on the outer surface of the protective cover, and the purge pipe assembly includes at least one outer purge pipe and an inner purge pipe, and the inlet ends of the outer purge pipe and the inner purge pipe are connected to the purge steam pipeline; The purge port of the outer purge pipe faces the inner wall of the mixing tank, and the purge port of the inner purge pipe faces the stirring shaft.

2. The automatic cleaning device for compound fertilizer system scarring according to claim 1 is characterized in that: The protective cover is a truncated cone structure. A steam coil is arranged in the interlayer cavity. The heating steam pipeline and the condensate outlet pipe are respectively connected to the inlet and outlet of the steam coil.

3. The automatic cleaning device for compound fertilizer system scarring according to claim 1 is characterized in that: The number of the external purge pipes is three, and the purge ports of the external purge pipes are evenly arranged at intervals of 60° along the outer edge of the protective cover; The number of the inner purge pipe is one, and the purge port of the inner purge pipe is arranged on the inner edge of the protective cover and obliquely downward toward the stirring shaft.

4. The automatic cleaning device for compound fertilizer system scarring according to claim 3 is characterized in that: The purge ports are all flat fan-shaped nozzles.

5. The automatic cleaning device for compound fertilizer system scarring according to any one of claims 1 to 4, characterized in that: The inlet of the purge steam pipeline is located outside the mixing tank and connected to the steam source. The inlet of the heating steam pipeline is located outside the mixing tank and connected to the side wall of the heating steam pipeline through a purge valve. A heating steam valve is also provided on the heating steam pipeline.

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