A liquid caustic addition control mechanism

Abstract

This utility model discloses a liquid alkali addition control mechanism, relating to the field of glycerol distillation equipment technology. It includes: a distillation tank and a tank cover installed on top of the tank. A mixing mechanism for agitating glycerol is provided below the tank cover to neutralize acids in the glycerol with liquid alkali. A liquid alkali storage component, a liquid alkali addition mechanism, and a pH meter are installed on the upper surface of the tank cover. The liquid alkali addition mechanism and the liquid alkali storage component are connected. Through the cooperation between the liquid alkali addition mechanism, the liquid alkali storage component, the pH meter, and the controller, an electric push rod drives a piston upwards, allowing liquid alkali to enter the suction cylinder through the inlet pipe. Under the action of the piston pushed by the electric push rod, the liquid alkali is quantitatively added through the outlet pipe. Simultaneously, combined with real-time monitoring by the pH meter, automated and precise control of liquid alkali addition is achieved, effectively improving the neutralization efficiency and quality of acids in the glycerol.

Description

Technical Field

[0001] This utility model relates to the technical field of glycerol distillation equipment, specifically to a liquid alkali addition control mechanism. Background Technology

[0002] Glycerol (glycerol) is an important organic compound widely used in chemical, pharmaceutical, and food industries. Its production process often involves distillation purification. During glycerol distillation, the raw materials (such as oil hydrolysis or biodiesel byproducts) may contain free fatty acids, saponifications, and other organic impurities. Direct distillation can easily lead to equipment scaling and corrosion, and reduce product purity.

[0003] In the prior art, Chinese utility model application CN202120752907.9 discloses a glycerol production device, including a distillation tank. The bottom of the distillation tank is connected to an inlet pipe for conveying glycerol; the upper part of the distillation tank is connected to an inlet pipe for conveying steam; the top of the distillation tank is provided with an exhaust port for discharging glycerol vapor, which is used to connect to a condenser; multiple sets of heating rods are suspended in the inner cavity of the distillation tank, and the heating rods are arranged at intervals from top to bottom; the heating rods are spirally arranged around the inner cavity of the distillation tank; the heating rods are located below the inlet pipe. Although this utility model uses spiral heating rods, it greatly increases the contact area between the glycerol and the heating rods, thereby improving the evaporation rate of glycerol.

[0004] However, before distillation, glycerol requires the addition of liquid alkali to neutralize free fatty acids. Manual control can easily lead to large pH fluctuations. Excessive alkali addition may trigger saponification and increase glycerol loss, while insufficient alkali addition will fail to completely neutralize acidic substances, exacerbate equipment corrosion, and affect the stability of subsequent distillation. Therefore, we need to propose a liquid alkali addition control mechanism. Utility Model Content

[0005] The purpose of this invention is to provide a liquid alkali addition control mechanism. By setting a liquid alkali addition mechanism on the distillation tank, the pH value during the glycerol distillation process can be precisely adjusted. By automatically controlling the amount of liquid alkali added, the neutralization reaction can be ensured to be sufficient, while avoiding excessive alkali addition that could lead to equipment corrosion or glycerol loss, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a liquid alkali addition control mechanism, comprising:

[0007] A distillation vessel and a lid installed on top of the distillation vessel, wherein a mixing mechanism for agitating glycerol is provided below the lid to achieve neutralization of acidified substances in glycerol by liquid alkali;

[0008] A liquid alkali storage assembly, a liquid alkali addition mechanism, and a pH meter are installed on the upper surface of the tank lid, wherein the liquid alkali addition mechanism is connected to the liquid alkali storage assembly.

[0009] The liquid alkali adding mechanism includes a liquid extraction cylinder, an electric push rod is installed on the top of the liquid extraction cylinder, the telescopic end of the electric push rod is located inside the liquid extraction cylinder and is fixedly connected to a piston, an inlet component connected to the liquid alkali storage component is provided on the outside of the liquid extraction cylinder for the liquid alkali to enter the liquid extraction cylinder, and a drain pipe penetrating the tank cover is provided at the lower end of the liquid extraction cylinder to realize the addition of a quantitative amount of liquid alkali.

[0010] Preferably, the liquid inlet assembly includes a connecting pipe connected to the liquid extraction cylinder, a first check valve is provided at one end of the connecting pipe near the liquid extraction cylinder, a filter cover is fitted at the liquid inlet end of the connecting pipe, and two sets of supports are provided on the outside of the liquid extraction cylinder.

[0011] Preferably, the drain pipe includes a drain pipe that passes through the tank cover at the lower end of the pumping cylinder, a second check valve is provided at the upper end of the drain pipe, a flow sensor for detecting the flow rate of liquid alkali is provided at the connection end between the upper end of the drain pipe and the pumping cylinder, and multiple sets of side pipes are provided at the lower end of the drain pipe.

[0012] Preferably, the liquid alkali storage assembly includes a storage tank connected to a connecting pipe, a liquid level sensor for detecting the liquid alkali level is installed inside the storage tank, and a controller electrically connected to the liquid level sensor, flow sensor, pH meter and electric actuator is installed on the outside of the distillation tank.

[0013] Preferably, the bottom of the distillation vessel is provided with an inlet pipe for glycerol to enter, and the upper surface of the vessel lid is provided with an exhaust pipe and an air inlet pipe.

[0014] Preferably, the hybrid mechanism includes a rotating shaft rotatably disposed at the top of the tank lid and a stirring and scraping component mounted on the rotating shaft. The upper end of the rotating shaft passes through the tank lid and is driven by a motor. The lower end of the rotating shaft is provided with a lifting spiral blade. An inner cylinder is installed at the bottom of the distillation tank. Multiple sets of side grooves are opened at the lower outer side of the inner cylinder. The lifting spiral blade is disposed in the inner cavity of the inner cylinder.

[0015] Preferably, the stirring and scraping component includes a connecting crossbar fixedly connected to the rotating shaft, with a first scraper and a second scraper fixedly connected to both ends of the connecting crossbar, and a turbulence-inducing blade provided between the first scraper and the second scraper.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention mainly utilizes the coordination between a liquid alkali adding mechanism, a liquid alkali storage component, a pH meter, and a controller. An electric push rod drives the piston upward, allowing liquid alkali to enter the extraction cylinder through the inlet pipe. Under the action of the electric push rod pushing the piston, the liquid alkali is quantitatively added through the outlet pipe. Simultaneously, combined with real-time monitoring by the pH meter, the addition of liquid alkali is automated and precisely controlled, effectively improving the neutralization efficiency and quality of acids in glycerol. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the distillation tank of this utility model;

[0020] Figure 3 This is a schematic diagram of the liquid alkali adding mechanism of this utility model.

[0021] In the diagram: 1. Distillation tank; 2. Tank lid; 3. Inlet pipe; 4. Exhaust pipe; 5. Controller; 6. pH meter; 7. Hybridization mechanism; 71. Rotating shaft; 72. Motor; 73. Lifting screw blade; 74. Stirring and scraping component; 741. Connecting crossbar; 742. First scraper; 743. Second scraper; 744. Turbulence blade; 8. Liquid alkali storage assembly; 81. Storage tank; 82. Liquid level sensor; 9. Liquid alkali adding mechanism; 91. Pumping cylinder; 92. Support; 93. Electric push rod; 94. Piston; 95. Connecting pipe; 96. Filter cover; 97. First check valve; 98. Drain pipe; 99. Second check valve; 910. Side pipe; 911. Flow sensor; 10. Inner cylinder; 11. Side trough. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-3 This utility model provides a technical solution: a liquid alkali addition control mechanism, comprising:

[0024] Distillation tank 1, and tank cover 2 installed on top of distillation tank 1, with a mixing mechanism 7 for agitating glycerol provided below the tank cover 2 to achieve neutralization of acidified substances in glycerol by liquid alkali;

[0025] The liquid alkali storage component 8, the liquid alkali adding mechanism 9, and the pH meter 6 are installed on the upper surface of the tank cover 2. The liquid alkali adding mechanism 9 is connected to the liquid alkali storage component 8.

[0026] The liquid alkali adding mechanism 9 includes a liquid extraction cylinder 91. An electric push rod 93 is installed on the top of the liquid extraction cylinder 91. The telescopic end of the electric push rod 93 is located inside the liquid extraction cylinder 91 and is fixedly connected to a piston 94. Three inlet pipes connected to the liquid alkali storage component 8 are provided on the outside of the liquid extraction cylinder 91 for the liquid alkali to enter the liquid extraction cylinder 91. A drain pipe 98 penetrating the tank cover 2 is provided at the lower end of the liquid extraction cylinder 91 to realize the addition of a quantitative amount of liquid alkali. The piston 94 is driven to reciprocate by the electric push rod 93, which facilitates the liquid alkali to be drawn into the liquid extraction cylinder 91 through the liquid inlet component and then added to the distillation tank 1 through the drain pipe 98, so as to realize the precise metering and addition of liquid alkali and avoid human operation errors.

[0027] The liquid inlet assembly includes a connecting pipe 95 connected to the liquid extraction cylinder 91. A first check valve 97 is provided at one end of the connecting pipe 95 near the liquid extraction cylinder 91. A filter cover 96 is fitted onto the liquid inlet end of the connecting pipe 95. Two sets of supports 92 are provided on the outside of the liquid extraction cylinder 91. The first check valve 97 can prevent the extracted liquid alkali from flowing back into the liquid storage tank 81, and the filter cover 96 can prevent impurities in the liquid alkali from entering the distillation tank 1.

[0028] The drain pipe 98 includes a drain pipe 98 that passes through the tank cover 2 at the lower end of the suction cylinder 91. A second check valve 99 is provided at the upper end of the drain pipe 98. A flow sensor 911 for detecting the flow rate of liquid alkali is provided at the connection end between the upper end of the drain pipe 98 and the suction cylinder 91. Multiple sets of side pipes 910 are provided at the lower end of the drain pipe 98. The second check valve 99 can prevent glycerin backflow from contaminating the liquid alkali with the mixed liquid. The flow sensor 911 monitors the drain flow rate in real time and adjusts the addition rate with the controller 5 to adapt to different production needs.

[0029] The liquid alkali storage assembly 8 includes a storage tank 81 connected to a connecting pipe 95. A level sensor 82 for detecting the liquid alkali level is installed inside the storage tank 81. A controller 5 electrically connected to the level sensor 82, flow sensor 911, pH meter 6, and electric push rod 93 is installed on the outside of the distillation tank 1. The storage tank 81 is used to store liquid alkali. The level sensor 82 monitors the liquid level in real time. When the liquid level is lower than the threshold, the controller 5 issues an alarm to prompt the replenishment of liquid alkali. The storage tank 81 is connected to the pumping cylinder 91 through the connecting pipe 95 to form a stable liquid supply path. The pH meter monitors the glycerol pH value in real time and feeds it back to the controller 5. The controller 5 automatically adjusts the start, stop, and stroke of the electric push rod 93 according to the preset threshold to dynamically control the amount of liquid alkali added.

[0030] The bottom of the distillation tank 1 is provided with an inlet pipe 3 for glycerol to enter, and the upper surface of the tank cover 2 is provided with an exhaust pipe 4 and an air inlet pipe. The inlet pipe 3 delivers crude glycerol into the tank, the exhaust pipe 4 discharges the gas produced by the neutralization reaction, and the air inlet pipe (not shown in the figure) can be used to introduce protective gas or steam.

[0031] The mixing mechanism 7 includes a rotating shaft 71 rotatably mounted on the top of the tank cover 2 and a stirring and scraping component 74 mounted on the rotating shaft 71. The upper end of the rotating shaft 71 passes through the tank cover 2 and is driven by a motor 72. The lower end of the rotating shaft 71 is provided with a lifting spiral blade 73. An inner cylinder 10 is installed at the bottom of the distillation tank 1. Multiple sets of side grooves 11 are opened at the lower outer side of the inner cylinder 10. The lifting spiral blade 73 is located in the inner cavity of the inner cylinder 10. The motor 72 drives the rotating shaft 71 to rotate the stirring and scraping component 74 and the lifting spiral blade 73. The lifting spiral blade 73 lifts the glycerol from the bottom of the distillation tank 1 to the top along the inner cylinder 10. Through the combination of glycerol circulation and multi-angle stirring, the diffusion and reaction of liquid alkali and glycerol are accelerated, improving the neutralization efficiency.

[0032] The stirring and scraping component 74 includes a connecting crossbar 741 fixedly connected to the rotating shaft 71. A first scraper 742 and a second scraper 743 are fixedly connected to both ends of the connecting crossbar 741. A turbulence-disrupting blade 744 is provided between the first scraper 742 and the second scraper 743. The first scraper 742 and the second scraper 743 scrape off the deposits on the inner wall of the distillation tank 1 and the outer wall of the inner cylinder 10, respectively, to prevent glycerol carbonization or liquid alkali crystallization and extend the equipment life. The turbulence-disrupting blade 744 breaks the laminar flow, increases the contact area between glycerol and liquid alkali, and improves the acid neutralization reaction rate.

[0033] During use, the pH meter monitors the acidity or alkalinity of glycerol in the distillation tank 1 in real time and feeds it back to the controller 5. The controller 5 starts the electric push rod 93 according to the preset threshold. The electric push rod 93 drives the piston 94 to reciprocate in the liquid extraction cylinder 91. When the piston 94 moves upward, it draws liquid alkali from the storage tank 81 through the connecting pipe 95 under negative pressure (at this time, the first check valve 97 is open, the second check valve 99 is closed, and the filter cover 96 intercepts impurities simultaneously). When the piston 94 moves downward, it injects liquid alkali into the distillation tank 1 through the drain pipe 98 under positive pressure (at this time, the second check valve 99 is open, and the first check valve 97 is closed). The flow sensor 911 monitors the drain flow rate simultaneously and feeds it back to the controller 5 to accurately adjust the amount added.

[0034] Meanwhile, the hybrid mechanism 7 uses the lifting screw blade 73 to circulate and lift the glycerin, and the stirring and scraping component 74 to stir at multiple angles, accelerating the mixing and neutralization reaction of liquid alkali and glycerin, thereby achieving precise control and efficient reaction of liquid alkali addition.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A caustic soda addition control mechanism characterized by, include: A distillation tank (1) and a tank cover (2) installed on the top of the distillation tank (1), wherein a mixing mechanism (7) for agitating glycerol is provided below the tank cover (2) to achieve neutralization of acidified substances in glycerol by liquid alkali; The liquid alkali storage assembly (8), the liquid alkali addition mechanism (9), and the pH meter (6) are installed on the upper surface of the tank cover (2). The liquid alkali addition mechanism (9) is connected to the liquid alkali storage assembly (8). The liquid alkali adding mechanism (9) includes a liquid extraction cylinder (91), an electric push rod (93) is installed on the top of the liquid extraction cylinder (91), the telescopic end of the electric push rod (93) is located inside the liquid extraction cylinder (91) and is fixedly connected to a piston (94), an inlet component connected to the liquid alkali storage component (8) is provided on the outside of the liquid extraction cylinder (91) for the liquid alkali to enter the liquid extraction cylinder (91), and a drain pipe (98) penetrating the tank cover (2) is provided at the lower end of the liquid extraction cylinder (91) to realize the addition of a quantitative amount of liquid alkali.

2. The caustic addition control mechanism of claim 1, wherein: The liquid inlet assembly includes a connecting pipe (95) connected to the liquid extraction cylinder (91). A first check valve (97) is provided at one end of the connecting pipe (95) near the liquid extraction cylinder (91). A filter cover (96) is fitted at the liquid inlet end of the connecting pipe (95). Two sets of supports (92) are provided on the outside of the liquid extraction cylinder (91).

3. The caustic addition control mechanism of claim 2, wherein: The drain pipe (98) includes a drain pipe (98) that passes through the tank cover (2) at the lower end of the pumping cylinder (91). A second check valve (99) is provided at the upper end of the drain pipe (98). A flow sensor (911) for detecting the flow rate of liquid alkali is provided at the connection end between the upper end of the drain pipe (98) and the pumping cylinder (91). Multiple sets of side pipes (910) are provided at the lower end of the drain pipe (98).

4. The caustic addition control mechanism of claim 3, wherein: The liquid alkali storage assembly (8) includes a storage tank (81) connected to a connecting pipe (95). A liquid level sensor (82) for detecting the liquid alkali level is installed inside the storage tank (81). A controller (5) electrically connected to the liquid level sensor (82), flow sensor (911), pH meter (6), and electric push rod (93) is installed on the outside of the distillation tank (1).

5. The caustic addition control mechanism of claim 4, wherein: The bottom of the distillation tank (1) is provided with an inlet pipe (3) for glycerol to enter, and the upper surface of the tank cover (2) is provided with an exhaust pipe (4) and an air inlet pipe.

6. The caustic addition control mechanism of claim 1, wherein: The hybrid mechanism (7) includes a rotating shaft (71) rotatably disposed at the top of the tank cover (2) and a stirring and scraping component (74) mounted on the rotating shaft (71). The upper end of the rotating shaft (71) passes through the tank cover (2) and is driven by a motor (72). The lower end of the rotating shaft (71) is provided with a lifting spiral blade (73). An inner cylinder (10) is installed at the bottom of the distillation tank (1). Multiple sets of side grooves (11) are opened at the lower outer side of the inner cylinder (10). The lifting spiral blade (73) is disposed in the inner cavity of the inner cylinder (10).

7. The caustic addition control mechanism of claim 6, wherein: The stirring and wall scraping part (74) comprises a connecting cross bar (741) fixedly connected to the rotating shaft (71), both ends of the connecting cross bar (741) are fixedly connected with a first scraping rod (742) and a second scraping rod (743), and the first scraping rod (742) and the second scraping rod (743) are provided with a spoiler (744).

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