Fat powder spray granulation system

Abstract

The utility model provides a spray granulation system for fat powder. The spray granulation system comprises a spray granulation tower, a cyclone separator, a fan and a fluidization plate, a top air outlet of the spray granulation tower is communicated with a top side wall air inlet of the cyclone separator, a top air outlet of the cyclone separator is communicated with an air inlet of the fan, a three-way discharge pipe is arranged at the bottom of the spray granulation tower, and a lateral feed port of the discharge pipe is communicated with an inner bottom cavity of the spray granulation tower; a top air outlet of the discharging pipe is communicated with an air inlet in the side wall of the top of the cyclone separator, a fluidization plate is arranged at the inner bottom of the spray granulation tower, a fluidization air inlet is communicated with an air outlet of a fan, an air outlet of the fan is communicated with an air inlet of a heat exchanger, and an air outlet of the heat exchanger is communicated with the fluidization air inlet; the efficiency and the effect of spray granulation are improved, and the dirty problem, the potential safety hazard and the occupational health hazard caused by dust are eliminated.

Description

Technical Field

[0001] This utility model relates to the technical field of spray granulation systems, and in particular to a spray granulation system for fat powder. Background Technology

[0002] The processing principle of spray granulation of fatty acid powder: molten fatty acids at high temperature (60-70℃) are atomized through the spray nozzle at the top of the tower and solidified into particles with a diameter of ≤1mm by cold air at the bottom of the tower. The cold air is beneficial; the air becomes hot after convection and needs to be cooled by a refrigeration unit or heat exchanger before being recycled or discharged into the air as waste gas. Utility Model Content

[0003] The purpose of this invention is to provide a spray granulation system for fat powder.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0005] A spray granulation system for fat powder includes a spray granulation tower, a cyclone separator, a blower, and a fluidizing plate;

[0006] The top air outlet of the spray granulation tower is connected to the top side wall air inlet of the cyclone separator through a pipe. The top air outlet of the cyclone separator is connected to the air inlet of the blower through a pipe. The bottom outlet of the cyclone separator is used to discharge fat powder.

[0007] A three-way discharge pipe is provided on the side wall of the bottom of the spray granulation tower. The side inlet of the discharge pipe is connected to the inner bottom cavity of the spray granulation tower. The top outlet of the discharge pipe is connected to the top side wall inlet of the cyclone separator through a pipe. The bottom outlet of the discharge pipe is used to discharge fat powder.

[0008] The spray granulation tower has a fluidizing plate at its inner bottom for forming a fluidized bed discharge structure. The lateral feed inlet of the discharge pipe is positioned higher than the fluidizing plate. The fluidizing air inlet at the bottom of the spray granulation tower is connected to the air outlet of the blower via a pipe. The fluidizing air inlet of the spray granulation tower is located below the fluidizing plate.

[0009] Preferably, the spray granulation tower is provided with an inner vertical pipe, the top end of which is sealed and welded to the inner top wall of the spray granulation tower. The inner vertical pipe is located below the top nozzle of the spray granulation tower so that the raw material liquid sprayed from the top nozzle can be directly sprayed downward into the inner vertical pipe. The inner vertical pipe extends downward until it is 10-20 cm away from the top surface of the powder layer accumulated at the bottom of the spray granulation tower.

[0010] The interlayer cavity between the inner vertical pipe and the vertical side wall of the spray granulation tower forms an upward exhaust gas channel, which is used for the gas injected into the spray granulation tower from the fluidizing plate to be discharged after passing through the upward exhaust gas channel. The top outlet of the upward exhaust gas channel in the spray granulation tower is connected to the top side wall air inlet of the cyclone separator through a pipe.

[0011] The upward exhaust channel is equipped with an outer downward inclined baffle and an inner downward inclined baffle for wind and dust removal. Multiple outer downward inclined baffles and multiple inner downward inclined baffles are arranged alternately from bottom to top.

[0012] Preferably, the air outlet of the blower is connected to the air inlet of the heat exchanger via a pipe, and the air outlet of the heat exchanger is connected to the fluidization air inlet at the bottom of the spray granulation tower via a pipe.

[0013] Preferably, the heat exchanger is a shell-and-tube heat exchanger for cold water.

[0014] This application has achieved the following beneficial technical effects:

[0015] During the spray granulation process of fat powder, when the material discharged from the spray granulation tower enters the ton bag or barrel, since the outlet and the ton bag or barrel are open and not sealed, slight fluctuations in the air pressure inside the tower will create positive pressure and cause air to escape. The overflowing air carries a small amount of fine dust, causing dirt and mess near the silo and wasting materials. More seriously, the dust cloud formed poses a fire and explosion hazard. Inhaling large amounts of dust can cause occupational health hazards to operators.

[0016] In order to eliminate the safety hazard of dust leakage caused by the positive and negative pressure switching at the outlet of the spray granulation tower and to purify the working area environment, this application designs a three-way discharge pipe at the bottom outlet of the spray granulation tower. The side inlet of the discharge pipe is connected to the inner bottom cavity of the spray granulation tower, the top outlet of the discharge pipe is connected to the top side wall air inlet of the cyclone separator through a pipe, and the bottom outlet of the discharge pipe is used to discharge fat powder.

[0017] When the air volume of the spray granulation tower is unbalanced, causing frequent switching between positive and negative pressure at the outlet, open the valve of the connecting pipeline. Because there is a high negative pressure at the air inlet on the top side wall of the cyclone separator, a negative pressure state will also be formed in the return air duct. At this time, the fine dust that is carried out from the outlet with the positive pressure air will merge with the normal process air along the return air duct and enter the cyclone separator for dust removal. The dust can be effectively collected. The process air after dust removal will be re-entered into the spray granulation tower for circulation by the fan.

[0018] Adjust the opening and closing degree of the air volume control valve according to the positive pressure air volume at the discharge port to ensure that all the escaped dust can be recovered into the cyclone separator.

[0019] This application can effectively eliminate the mess caused by dust on site, and at the same time completely eliminate dust safety hazards and reduce occupational health hazards to operators caused by dust inhalation.

[0020] This application includes a fluidizing plate, which serves two purposes: first, it is used to blow cold air to cool and solidify the small droplets sprayed from the top nozzle into small particles, thus completing spray granulation; second, it is used to form a fluidized bed discharge structure, which discharges the powder accumulated at the bottom of the spray granulation tower into the side inlet of the three-way discharge pipe.

[0021] In this application, the top nozzle sprays the raw material liquid downwards, while the fluidizing plate blows air upwards. The exhaust gas in the spray granulation tower is discharged upwards from the top. Thus, the downward-flowing droplets and the upward-blown cold air from the fluidizing plate meet and condense, while the upward exhaust process interferes with each other, similar to traffic congestion and chaos caused by unmarked roads. This is detrimental to the efficiency and effectiveness of spray granulation. Therefore, this application adds an internal vertical pipe to form a dedicated upward exhaust channel, separating the downward-flowing droplets and the upward-blown cold air from the fluidizing plate, allowing each to flow through its own channel without interference. The exhaust gas ultimately exits the spray granulation tower through the upward exhaust channel, facilitating a stable gas flow field and improving the efficiency and effectiveness of spray granulation. Attached Figure Description

[0022] Figure 1 A schematic diagram of a spray granulation system for fat powder provided for an embodiment of this utility model;

[0023] Figure 2 A schematic diagram of a spray granulation system for fat powder is provided for another embodiment of this utility model;

[0024] In the diagram: 1 spray granulation tower, 101 inner vertical pipe, 102 top nozzle, 103 outer downward inclined baffle, 104 inner downward inclined baffle, 105 discharge pipe;

[0025] 2. Cyclone separator; 3. Fan; 4. Fluidizing plate;

[0026] 5. Heat exchanger. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "axial", "radial", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Reference Figure 1-2 In the figure: spray granulation tower 1, inner vertical pipe 101, top nozzle 102, outer downward inclined baffle 103, inner downward inclined baffle 104, discharge pipe 105; cyclone separator 2; fan 3; fluidizing plate 4; heat exchanger 5.

[0030] This application provides a spray granulation system for fat powder, including a spray granulation tower 1, a cyclone separator 2, a blower 3, and a fluidizing plate 4;

[0031] The top air outlet of the spray granulation tower 1 is connected to the top side wall air inlet of the cyclone separator 2 through a pipe. The top air outlet of the cyclone separator 2 is connected to the air inlet of the blower 3 through a pipe. The bottom discharge port of the cyclone separator 2 is used to discharge fat powder.

[0032] The spray granulation tower 1 has a three-way discharge pipe 105 on the side wall at the bottom. The side inlet of the discharge pipe 105 is connected to the inner bottom cavity of the spray granulation tower 1. The top outlet of the discharge pipe 105 is connected to the top side wall inlet of the cyclone separator 2 through a pipe. The bottom outlet of the discharge pipe 105 is used to discharge fat powder.

[0033] The bottom of the spray granulation tower 1 is provided with a fluidizing plate 4 for forming a fluidized bed discharge structure. The lateral feed inlet of the discharge pipe 105 is higher than the position of the fluidizing plate 4. The fluidizing air inlet at the bottom of the spray granulation tower 1 is connected to the air outlet of the blower 3 through a pipe. The fluidizing air inlet of the spray granulation tower 1 is located below the fluidizing plate 4.

[0034] In one embodiment of this application, the spray granulation tower 1 is provided with an inner vertical pipe 101. The top end of the inner vertical pipe 101 is sealed and welded to the inner top wall of the spray granulation tower 1. The inner vertical pipe 101 is located below the top nozzle 102 of the spray granulation tower 1 so that the raw material liquid sprayed from the top nozzle 102 can be directly sprayed downward into the inner vertical pipe 101. The inner vertical pipe 101 extends downward until it is 10-20 cm away from the top surface of the powder layer accumulated at the bottom of the inner side of the spray granulation tower 1.

[0035] The interlayer cavity between the inner vertical pipe 101 and the vertical side wall of the spray granulation tower 1 forms an upward discharge air channel, which is used for the gas injected into the spray granulation tower 1 from the fluidizing plate 4 to be discharged after passing through the upward discharge air channel. The top outlet of the upward discharge air channel in the spray granulation tower 1 is connected to the top side wall air inlet of the cyclone separator 2 through a pipe.

[0036] The upward exhaust channel is provided with an outer downward inclined wind baffle 103 and an inner downward inclined wind baffle 104 for wind protection and dust removal. Multiple outer downward inclined wind baffles 103 and multiple inner downward inclined wind baffles 104 are arranged alternately from bottom to top.

[0037] In one embodiment of this application, the air outlet of the fan 3 is connected to the air inlet of the heat exchanger 5 through a pipe, and the air outlet of the heat exchanger 5 is connected to the fluidization air inlet at the bottom of the spray granulation tower 1 through a pipe.

[0038] In one embodiment of this application, the heat exchanger 5 is a shell-and-tube cold water heat exchanger 5, which uses cold water to cool and lower the gas blown out by the fan 3.

[0039] In this application, a cyclone separator is a device used for separating gas-solid or liquid-solid systems. Its working principle is based on the rotational motion caused by the tangential introduction of airflow, which causes solid particles or liquid droplets with large inertial centrifugal force to be thrown towards the outer wall surface and separated. The main features of the cyclone separator are simple structure, high operational flexibility, high efficiency, convenient management and maintenance, and low price. It is used to collect dust with a diameter of 5-10μm or larger and is widely used in the pharmaceutical industry. It is particularly suitable for dust particles that are relatively coarse, have a high dust concentration, and are used under high temperature and high pressure conditions. It is also often used as an internal separation device in fluidized bed reactors or as a pre-separator. It is a widely used separation device in industry.

[0040] The methods and apparatus not described in detail in this utility model are all prior art and will not be elaborated further.

[0041] This document uses specific embodiments to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A spray granulation system for fat powder, characterized in that, This includes spray granulation towers, cyclone separators, fans, and fluidizing plates; The top air outlet of the spray granulation tower is connected to the top side wall air inlet of the cyclone separator through a pipe. The top air outlet of the cyclone separator is connected to the air inlet of the blower through a pipe. The bottom outlet of the cyclone separator is used to discharge fat powder. A three-way discharge pipe is provided on the side wall of the bottom of the spray granulation tower. The side inlet of the discharge pipe is connected to the inner bottom cavity of the spray granulation tower. The top outlet of the discharge pipe is connected to the top side wall inlet of the cyclone separator through a pipe. The bottom outlet of the discharge pipe is used to discharge fat powder. The spray granulation tower has a fluidizing plate at its inner bottom for forming a fluidized bed discharge structure. The lateral feed inlet of the discharge pipe is positioned higher than the fluidizing plate. The fluidizing air inlet at the bottom of the spray granulation tower is connected to the air outlet of the blower via a pipe. The fluidizing air inlet of the spray granulation tower is located below the fluidizing plate.

2. The spray granulation system for fat powder according to claim 1, characterized in that, The spray granulation tower is equipped with an inner vertical pipe. The top end of the inner vertical pipe is sealed and welded to the inner top wall of the spray granulation tower. The inner vertical pipe is located below the top nozzle of the spray granulation tower so that the raw material liquid sprayed from the top nozzle can be directly sprayed downward into the inner vertical pipe. The inner vertical pipe extends downward until it is 10-20cm away from the top surface of the powder layer accumulated at the bottom of the spray granulation tower. The interlayer cavity between the inner vertical pipe and the vertical side wall of the spray granulation tower forms an upward exhaust gas channel, which is used for the gas injected into the spray granulation tower from the fluidizing plate to be discharged after passing through the upward exhaust gas channel. The top outlet of the upward exhaust gas channel in the spray granulation tower is connected to the top side wall air inlet of the cyclone separator through a pipe. The upward exhaust channel is equipped with an outer downward inclined baffle and an inner downward inclined baffle for wind and dust removal. Multiple outer downward inclined baffles and multiple inner downward inclined baffles are arranged alternately from bottom to top.

3. The spray granulation system for fat powder according to claim 1, characterized in that, The air outlet of the blower is connected to the air inlet of the heat exchanger via a pipe, and the air outlet of the heat exchanger is connected to the fluidization air inlet at the bottom of the spray granulation tower via a pipe.

4. The spray granulation system for fat powder according to claim 3, characterized in that, The heat exchanger is a shell-and-tube heat exchanger for cold water.

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