Nitro high-tower compound fertilizer slurry secondary flow heater

Abstract

The utility model provides a secondary flow heater for nitro high-tower compound fertilizer slurry, which is characterized in that a heat exchange inner cavity is arranged in a shell, a feed port is arranged above the shell, and a discharge port is arranged below the shell; the two heating plates are obliquely distributed in the heat exchange inner cavity so that a zigzag heating channel can be formed between the feeding port and the discharging port. Heating pipes perpendicular to the flow direction of slurry are distributed on the upper and lower surfaces of the heating plate, and are correspondingly connected with an air inlet pipe and a water outlet pipe. The two heating plates are distributed in a zigzag shape, so that a large heat exchange area is arranged in a small heat exchange space in the shell, the slurry secondary flow heater is of a totally-closed structure, slurry does not make contact with the outside, the feeding port and the exhaust port are formed in the upper portion of the shell, and the heat exchange area is large. And ammonia gas generated during heating can directly enter a subsequent treatment facility through the exhaust port, so that the ammonia gas is prevented from escaping.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical equipment, specifically relates to a nitro high tower compound fertilizer slurry secondary flow heater. BACKGROUND

[0002] The compound fertilizer category prepared by the melt method high tower air cooling is divided into urea-based compound fertilizer and nitro compound fertilizer. The production raw material of nitro compound fertilizer is nitro ammonium phosphate as base fertilizer, and the production raw material of urea-based compound fertilizer is urea as base fertilizer. Nitro ammonium phosphate and urea are all melted into liquid slurry and then other element fertilizers are added, so that granulation can be carried out to become finished compound fertilizer, and the melt heat value of nitro ammonium phosphate is greater than that of urea, so that higher temperature and more heat are required in the production process to meet the process requirements. In order to provide more heat for nitro compound fertilizer, the slurry heating equipment for producing compound fertilizer needs to be provided with more heat exchange area, and the equipment specification is also increased. However, in the production process of nitro compound fertilizer, with the increase of temperature, nitro ammonium has the risk of fire or explosion. The production equipment for preparing compound fertilizer by the melt method high tower air cooling all adopts a vertical reaction kettle, and the discharge mode is an overflow structure, and the increase of equipment leads to the increase of the residence time of the molten slurry in the equipment, further increasing the risk.

[0003] Therefore, it is necessary to provide an improved technical scheme for the above-mentioned prior art. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the deficiencies in the prior art, and provides a nitro high tower compound fertilizer slurry secondary flow heater.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A nitro high tower compound fertilizer slurry secondary flow heater, comprising:

[0007] A shell, the shell has a heat exchange inner cavity inside, a feeding port is arranged above the shell, and a discharge port is arranged below the shell;

[0008] Two heating plates are inclinedly arranged in the heat exchange inner cavity to form a zigzag heating channel between the feeding port and the discharge port;

[0009] The upper and lower surfaces of the heating plate are both provided with heating pipes perpendicular to the slurry flow direction, and the heating pipes are correspondingly connected with air inlet pipes and water outlet pipes.

[0010] Preferably, the upper surface of the heating plate is provided with a flow resistance pipe, and the flow resistance pipe is located at both ends of the heating plate corresponding to the slurry flow direction.

[0011] Preferably, both the heating tube and the flow-blocking tube are half-tubes, and the diameter of the half-tube corresponding to the flow-blocking tube is larger than the diameter of the heating tube.

[0012] Alternatively, the heating tube and the flow-blocking tube have the same diameter for their corresponding half-tubes, and the angle of the arc corresponding to the heating tube is smaller than the angle of the arc corresponding to the flow-blocking tube.

[0013] Preferably, the air inlet pipe is connected to a steam source, and the air inlet pipe is provided with a plurality of branch pipes that are connected to the heating pipe and the flow-blocking pipe respectively;

[0014] The water outlet pipe is provided with multiple branch pipes that are correspondingly connected to the heating pipe and the flow-blocking pipe, and the water outlet pipe extends out of the housing.

[0015] Preferably, the two sets of air inlet pipes and water outlet pipes correspond to the two heating plates respectively.

[0016] Preferably, the width of the heating plate matches the width of the heat exchange cavity, and the two heating plates are respectively located on opposite inner walls of the heat exchange cavity.

[0017] Preferably, the feed inlet extends to the higher end of the upper heating plate, and a gap is left between the other end of the upper heating plate and the heat exchange cavity;

[0018] The higher end of the lower heating plate extends to the inner wall of the heat exchange cavity, and the other end extends to the discharge port; the bottom of the shell is provided with a liquid collection tank corresponding to the discharge port.

[0019] Preferably, the side of the housing is provided with a cleaning port and an observation window corresponding to the heating plate.

[0020] Preferably, an exhaust port is provided on the top of the housing.

[0021] Preferably, the tilt angle of the heating plate is 75°.

[0022] Beneficial effects: The two heating plates are arranged in a zigzag pattern, which allows for a larger heat exchange area within the relatively small heat exchange space inside the shell. This slurry secondary flow heater adopts a fully enclosed structure, so the slurry does not come into contact with the outside. An inlet and an outlet are set at the top of the shell. The ammonia gas generated during heating will directly enter the subsequent processing facilities through the outlet, thus preventing it from escaping. Because the residence time of the nitro compound fertilizer slurry in the heating equipment is short, it also effectively prevents fire and explosion, greatly reducing or avoiding environmental pollution and safety hazards. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0024] Fig. 1 This is a simplified structural diagram of the heater in a specific embodiment of the present invention;

[0025] Fig. 2 This is a simplified structural diagram of the heating plate in a specific embodiment of the present invention.

[0026] In the diagram: 1. Shell; 2. Exhaust port; 3. Feed inlet; 4. Discharge port; 5. Cleaning port; 6. Heating plate; 7. Baffle tube; 8. Heating tube; 9. Air inlet pipe; 10. Water outlet pipe; 11. Observation window. Detailed Implementation

[0027] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the protection scope of this utility model.

[0028] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected" and "linked" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0030] like Figs. 1-2As shown, a secondary flow heater for nitro compound fertilizer slurry includes a shell 1 and heating plates 6. The shell 1 is a square structure welded from metal plates. An anti-corrosion coating is applied inside the shell 1. The shell 1 has a heat exchange cavity, which is square. An inlet 3 is located at the top of the shell 1, and an outlet 4 is located at the bottom of the shell 1. To further increase the heating area, the inlet 3 and outlet 4 are preferably located on the same side of the shell 1. Two heating plates 6 are inclinedly distributed in the heat exchange cavity to form a zigzag heating channel between the inlet 3 and outlet 4. The heating plates 6 are metal plates and are fixed to the shell 1 by welding. The inner wall is designed to guide the slurry, allowing it to be transported through the heating channel. Heating pipes 8, perpendicular to the slurry flow direction, are distributed on both the upper and lower surfaces of the heating plate 6. The heating pipes 8 heat the slurry flowing through them, ensuring a large contact area for heating. The heating pipes 8 are connected to an air inlet pipe 9 and a water outlet pipe 10. The air inlet pipe 9 is used to connect to a heat source, preferably steam, to ensure uniform and safe heating of the slurry. The water outlet pipe 10 and the air inlet pipe 9 are located at opposite ends of the heating pipes 8. The condensate and steam after cooling are discharged through the water outlet pipe 10, thus creating a flow of heat within the heating pipes 8 and ensuring the heating effect.

[0031] After the compound fertilizer slurry is melted, it enters the equipment through the inlet 3 at the top of the shell 1. The slurry flows in a zigzag pattern inside the equipment, first contacting the upper heating plate 6, then the lower heating plate 6. After being fully heated twice to reach the required temperature, it flows out from the outlet 4 to the next process. Furthermore, heating tubes 8 are evenly distributed on both the upper and lower surfaces of the heating plate 6. The distance between two adjacent heating tubes 8 on the same surface of the heating plate 6 is less than the width of the heating tube 8. The joints between the heating tubes 8 on the upper and lower surfaces of the heating plate 6 are staggered, ensuring that every point of contact between the heating plate 6 and the slurry is heated. This ensures uniform temperature of the heating plate 6, and the heating efficiency is improved by using two heating plates 6.

[0032] In an optional embodiment, in order to prevent the slurry from flowing too fast and not being heated sufficiently, a flow-blocking tube 7 is provided on the upper surface of the heating plate 6. The flow-blocking tube 7 blocks the flow of the slurry. The flow-blocking tube 7 is located at both ends of the heating plate 6 corresponding to the slurry flow direction, which increases the liquid level and hinders a certain flow rate, so that the slurry can be heated sufficiently to reach the required temperature.

[0033] In this embodiment, both the heating tube 8 and the flow-blocking tube 7 are half-tubes. Specifically, the arc angle corresponding to the half-tube is 180°, and the diameter of the half-tube corresponding to the flow-blocking tube 7 is larger than the diameter corresponding to the heating tube 8.

[0034] Alternatively, the diameters of the corresponding circular tube halves of the heating tube 8 and the flow-blocking tube 7 may be the same, but the angle of the arc corresponding to the heating tube 8 may be smaller than the angle of the arc corresponding to the flow-blocking tube 7. For example, the arc angle corresponding to the heating tube 8 may be 90-150°, while the arc angle corresponding to the flow-blocking tube 7 may be 180°.

[0035] The half-tube is formed by cutting a round tube along one of its diameters. The half-tube is placed on the surface of the heating plate 6, and sealing plates are set at both ends of the plate tube to form a sealed cavity. Branch tubes are provided on the sealing plates at both ends of the half-tube.

[0036] One end of the air inlet pipe 9 is sealed, and the other end extends out of the housing 1 and is connected to the steam source. Multiple branch pipes are provided on the air inlet pipe 9 to connect the heating pipe 8 and the flow-blocking pipe 7. The housing 1 of the air inlet pipe 9 is sealed by welding. Multiple branch pipes are provided on the water outlet pipe 10 to connect the heating pipe 8 and the flow-blocking pipe 7. One end of the water outlet pipe 10 is sealed, and the other end extends out of the housing 1 and is connected to the steam generating equipment after extending out of the housing 1, thereby forming a circulation and avoiding heat waste.

[0037] Alternatively, the bottom of the housing 1 may be an inclined surface corresponding to the lower heating plate 6, or the bottom of the housing 1 may be a heating plate 6, with the corresponding water outlet pipe 10 of the lower heating plate 6 placed directly outside the housing 1.

[0038] In this embodiment, the tilt angles of the water outlet pipe 10 and the air inlet pipe 9 are the same as the tilt angles of the corresponding heating plate 6. The higher end of the air inlet pipe 9 is connected to the steam source, and the lower end of the water outlet pipe 10 extends out of the housing 1 and is connected to the steam generating device.

[0039] Two sets of air inlet pipes 9 and water outlet pipes 10 are provided inside the housing 1, and the two sets of air inlet pipes 9 and water outlet pipes 10 correspond to two heating plates 6 respectively.

[0040] In one optional embodiment, the width of the heating plate 6 matches the width of the heat exchange cavity, and the length of the heating plate 6 is the same as or slightly less than the length of the heat exchange cavity. The specific length is such that the heating plate 6 does not completely enclose the heat exchange cavity. The two heating plates 6 are located on opposite inner walls of the heat exchange cavity. Specifically, the feed inlet 3 extends to the higher end of the upper heating plate 6, and a gap is left between the other end of the upper heating plate 6 and the heat exchange cavity for slurry flow. The higher end of the lower heating plate 6 extends to the inner wall of the heat exchange cavity, and the other end extends to the discharge port 4. The bottom of the housing 1 is provided with a collection tank corresponding to the discharge port 4. The heated slurry is collected through the collection tank, so that the slurry can be discharged smoothly.

[0041] In an optional embodiment, considering various unexpected situations that may occur during the production process, the equipment needs to be able to handle them promptly. The side of the housing 1 is provided with a cleaning port 5 corresponding to the heating plate 6 and an observation window 11. This allows for continuous observation and cleaning of the equipment's production status, enabling monitoring of the production dynamics within the equipment. The sealing plate of the cleaning port 5 is sealed by bolts, and the observation window 11 can be an acrylic glass embedded in the housing 1. This design allows the secondary flow heater for nitro-based high-tower compound fertilizer slurry to achieve a large heat exchange area while also ensuring a short residence time of the slurry within the equipment, easy cleaning, and safety.

[0042] An exhaust port 2 is located above the shell 1, through which the ammonia gas generated during heating directly enters the subsequent processing facilities; the heating plate 6 is tilted at an angle of 75°. Because the nitro-compound fertilizer slurry has a short residence time within the equipment, it effectively prevents fires and explosions, greatly reducing or avoiding environmental pollution and safety hazards.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be within the scope of protection of the pending claims of the present utility model.

Claims

1. A secondary flow heater for nitro high-tower compound fertilizer slurry, characterized in that, include: The housing has a heat exchange cavity inside, an inlet is provided at the top of the housing, and an outlet is provided at the bottom of the housing; Heating plates, two of which are inclinedly distributed in the heat exchange cavity to form a zigzag heating channel between the feed inlet and the discharge outlet; The upper and lower surfaces of the heating plate are each provided with heating pipes perpendicular to the slurry flow direction, and the heating pipes are connected to an air inlet pipe and a water outlet pipe respectively.

2. The secondary flow heater for nitro high-tower compound fertilizer slurry according to claim 1, characterized in that, The upper surface of the heating plate is provided with flow-blocking tubes, which are located at both ends of the heating plate corresponding to the slurry flow direction.

3. The secondary flow heater for nitro high-tower compound fertilizer slurry according to claim 2, characterized in that, Both the heating tube and the flow-blocking tube are half-tubes, and the diameter of the half-tube corresponding to the flow-blocking tube is larger than the diameter of the heating tube. Alternatively, the heating tube and the flow-blocking tube have the same diameter for their corresponding half-tubes, and the angle of the arc corresponding to the heating tube is smaller than the angle of the arc corresponding to the flow-blocking tube.

4. The secondary flow heater for nitro high-density compound fertilizer slurry according to claim 3, characterized in that, The air inlet pipe is connected to a steam source, and multiple branch pipes are provided on the air inlet pipe to connect to the heating pipe and the flow-blocking pipe. The water outlet pipe is provided with multiple branch pipes that are correspondingly connected to the heating pipe and the flow-blocking pipe, and the water outlet pipe extends out of the housing.

5. The secondary flow heater for nitro high-tower compound fertilizer slurry according to claim 4, characterized in that, The two sets of air inlet pipes and water outlet pipes correspond to the two heating plates, respectively.

6. The secondary flow heater for nitro high-density compound fertilizer slurry according to claim 1, characterized in that, The width of the heating plate matches the width of the heat exchange cavity, and the two heating plates are located on opposite inner walls of the heat exchange cavity.

7. The secondary flow heater for nitro high-density compound fertilizer slurry according to claim 6, characterized in that, The feed inlet extends to the higher end of the upper heating plate, and a gap is left between the other end of the upper heating plate and the heat exchange cavity. The higher end of the lower heating plate extends to the inner wall of the heat exchange cavity, and the other end extends to the discharge port; the bottom of the shell is provided with a liquid collection tank corresponding to the discharge port.

8. The secondary flow heater for nitro high-tower compound fertilizer slurry according to claim 1, characterized in that, The side of the housing is provided with a cleaning port and an observation window corresponding to the heating plate.

9. The secondary flow heater for nitro high-tower compound fertilizer slurry according to claim 1, characterized in that, An exhaust port is provided on the top of the housing.

10. The secondary flow heater for nitro high-tower compound fertilizer slurry according to claim 1, characterized in that, The heating plate is tilted at an angle of 75°.

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