Automatic kettle pressure control device for lime nitrogen hydrolysis kettle and use method of automatic kettle pressure control device

Abstract

The invention discloses an automatic kettle pressure control device for a lime nitrogen hydrolysis kettle and a use method thereof, and belongs to the technical field of hydrolysis kettles. Comprising a device body, one side of the upper end of the device body is connected with a feeding assembly, the feeding assembly drives a circular sealing plate through a two-way threaded rod, input of lime nitrogen and water can be rapidly cut off when pressure is abnormal, and after a pressure relief assembly is started, if an infrared sensor detects that the pressure is still continuously increased, for example, material unbalance is caused by blockage of a discharging port, the feeding assembly is started. The system automatically starts a second driving motor, an L-shaped sliding block drives a circular sealing plate to seal a feeding channel, the situation that reaction heat release and gas production are aggravated due to continuous feeding is avoided, feeding and pressure linkage control breaks through the limitation that materials are not controlled only through pressure relief in the traditional process, the root cause of pressure rising is restrained from the source, and the production efficiency is improved. Dynamic coupling of material balance and pressure balance is achieved, the stability of the system is remarkably improved, and the service life of the device is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrolysis kettles, and more particularly to a kettle pressure automatic control device for a lime nitrogen hydrolysis kettle and a use method thereof. Background Art

[0002] A hydrolyzer is a device used for hydrolysis reactions, primarily designed to promote chemical reactions under high temperature and pressure. It combines hydrolysis and extraction techniques to separate and purify mixtures. Its operating principle is to accelerate the reaction rate by increasing temperature and pressure, while simultaneously utilizing the different solubility capacities of the solvent to separate the reactants.

[0003] At present, when the lime nitrogen hydrolysis kettle is continuously transported and undergoes hydrolysis reaction, a large amount of ammonia gas is generated, and the hydrolysis kettle is normally in gas balance, heat balance and material balance, thereby keeping the kettle pressure in the hydrolysis kettle unchanged. However, when the hydrolysis kettle is in hydrolysis operation for a long time, the discharge port of the hydrolysis kettle may be blocked, resulting in material imbalance. In this way, the liquid level will be too high, compressing the gas phase space, causing pressure fluctuations, and thus causing the kettle pressure to continue to increase. However, the current hydrolysis kettle mainly relieves the air pressure in the kettle by opening the pressure relief port of the hydrolysis kettle. However, since the material in the hydrolysis kettle is continuously input and output, the liquid level will continue to rise until the air pressure in the kettle approaches the critical value and an alarm is issued, thereby allowing construction personnel to come for inspection. However, if the kettle pressure of the hydrolysis kettle is at the critical value, it will pose a serious threat to the equipment itself, process safety and production stability, thereby reducing the service life of the hydrolysis kettle. Summary of the Invention

[0004] The object of the present invention is to provide a device for automatically controlling the pressure of a lime-nitrogen hydrolysis kettle and a method for using the device to solve the problems raised in the above background technology.

[0005] A device for automatically controlling kettle pressure of a lime nitrogen hydrolysis kettle comprises a device body, wherein one side of the upper end of the device body is connected to a feed assembly, one end of the feed assembly is connected to a pressure relief assembly, and one end of the pressure relief assembly is connected to a kettle pressure detection assembly;

[0006] The kettle pressure detection assembly includes a detection frame, the upper end of the inner cavity of the detection frame is connected to a circular connecting block, the lower end surface of the circular connecting block is provided with a trigger groove, and the inner cavity of the detection frame is connected to an annular blocking block at one end away from the circular connecting block, the upper end of the annular blocking block is connected to a sliding block, the upper end of the sliding block is connected to a spherical sealing block, the upper end of the spherical sealing block is connected to a circular triggering block, and the lower end of the detection frame is connected to the stirring chamber, and the inner cavity of the circular connecting block is connected to a sensor and an infrared sensor;

[0007] The feeding assembly includes a first feeding pipe, the lower end of the first feeding pipe is connected to a sealing block, an L-shaped groove is opened in the inner cavity of the sealing block, a bidirectional threaded rod is connected to the inner cavity of the L-shaped groove, both ends of the bidirectional threaded rod are connected to L-shaped sliding blocks, and the end of the L-shaped sliding block away from the bidirectional threaded rod is connected to a circular sealing plate.

[0008] Preferably, the upper end of the device body is connected to a first drive motor, the lower end of the first drive motor is connected to a first rotating rod, the lower end surface of the first rotating rod is connected to a plurality of stirring rods, and a stirring chamber is installed in the inner cavity of the device body, and the stirring rods are installed in the stirring chamber, the inner cavity surface of the device body is connected to a reaction tank cooling jacket, the inner surface of the reaction tank cooling jacket is connected to a cooling coil, and a fixed bracket is installed on the outside of the device body.

[0009] Preferably, one end of the bidirectional threaded rod is connected to a second drive motor, a second feed pipe is connected just below the first feed pipe, an end of the sealing block away from the first feed pipe is connected to a metering pump, a third feed pipe is connected just below the metering pump, and a circular sealing plate is connected between the first feed pipe and the second feed pipe, as well as between the metering pump and the third feed pipe. At this time, the circular sealing plate plays a sealing role, the lower ends of the second feed pipe and the third feed pipe are both connected to the stirring chamber, and the circular sealing plate is initially separated from the feed pipe, and semi-arc sealing plates are connected at both ends of the lower end outlet of the third feed pipe and the second feed pipe, and an inclined return spring is connected to the upper end surface of the semi-arc sealing plate, so that when water and lime nitrogen generate a thrust on the semi-arc sealing plate, the inclined return spring will be stretched, thereby allowing the two semi-arc sealing plates to be expanded, and then the stirring chamber is transported with raw materials. When the raw material transportation stops, the semi-arc sealing plate will return to its original position.

[0010] Preferably, the pressure relief assembly includes a pressure relief frame, the lower end of the pressure relief frame is connected to an annular sealing block, the upper end surface of the annular sealing block is provided with a plurality of annular sealing grooves, and the outer surface of the pressure relief frame is connected to a pressure relief pipe, and the end of the pressure relief pipe away from the pressure relief frame is connected to a cooling pipe, and the end of the cooling pipe away from the pressure relief pipe is connected to an ammonia storage chamber.

[0011] Preferably, the upper end of the pressure relief frame is connected to a hydraulic pump, the lower end of the hydraulic pump is connected to a hydraulic rod, the lower end of the hydraulic rod is connected to a sealing block, the lower end surface of the sealing block is connected to several annular sealing blocks, and the annular sealing blocks coincide with the initial position of the annular sealing groove.

[0012] Preferably, the main body of the device is equipped with a kettle pressure automatic control system, and the kettle pressure automatic control system includes a kettle pressure automatic control processing unit. The input end of the kettle pressure automatic control processing unit is connected to the kettle pressure detection module and the infrared sensor module, and the output end of the kettle pressure automatic control processing unit is connected to the pressure relief module and the closing module. The outer surface of the main body of the device is connected to a control panel, and the control panel is equipped with the kettle pressure automatic control processing unit.

[0013] Preferably, the input end of the kettle pressure detection module is signal-connected to the data input end of the pressure relief component, and the output end of the pressure relief module is signal-connected to the data output end of the pressure relief component.

[0014] Preferably, the input end of the infrared sensor module is signal-connected to the data input end of the feeding component, and the output end of the closing module is signal-connected to the data output end of the feeding component.

[0015] Preferably, a method for using a device for automatically controlling the pressure of a lime nitrogen hydrolysis kettle comprises the following steps:

[0016] S1. First, lime nitrogen and water are respectively conveyed through a first feed pipe and a metering pump, and then through a second feed pipe and a third feed pipe into a stirring chamber. Then, the first drive motor is started through the control panel, and the first rotating rod is driven to rotate, thereby driving the stirring rod to rotate, thereby stirring the lime nitrogen and water. As the lime nitrogen and water are continuously stirred, a hydrolysis reaction occurs, thereby generating a calcium cyanamide solution and ammonia gas. As ammonia gas is continuously generated, the air pressure in the hydrolysis kettle increases, and the generated air pressure is relieved through a first pressure relief port connected to the upper surface of the device body. However, when the rate of ammonia generated in the hydrolysis kettle is higher than the discharge rate of the hydrolysis kettle, the continuous increase in the air pressure in the hydrolysis kettle will generate a thrust on the spherical sealing block, thereby causing the spherical sealing block to move upward along the detection frame, thereby driving the circular trigger block to move upward until the circular trigger block contacts the trigger groove;

[0017] S2. When the circular trigger block contacts the trigger groove, the sensor transmits the sensor data to the kettle pressure automatic control processing unit through the kettle pressure detection module, and the kettle pressure automatic control unit transmits the start instruction to the pressure relief component, starts the hydraulic pump, and then drives the hydraulic rod to perform a contraction operation, so that the sealing block and the annular sealing block move upward along the inner cavity of the pressure relief frame until they leak out of the pressure relief port of the pressure relief pipe;

[0018] S3. When the pressure relief port of the pressure relief pipe leaks out, the infrared sensor will detect whether the circular trigger block will continue to move upward along the trigger groove. If the infrared sensor detects that the circular trigger block continues to move upward, the detection data will be transmitted to the kettle pressure automatic control processing unit through the infrared sensor module. Then, the kettle pressure automatic control processing unit starts the second drive motor and drives the bidirectional threaded rod to rotate, thereby driving the L-shaped sliding block and the circular sealing plate to move along the L-shaped slide groove toward the two ends of the bidirectional threaded rod until the gap formed by the circular sealing plate and the first feeding pipe and the second feeding pipe and the gap between the metering pump and the third feeding pipe coincide with each other. At this time, the circular sealing plate performs a sealing operation on the first feeding pipe and the metering pump, thereby preventing water and lime nitrogen from being transported into the stirring chamber.

[0019] S4. When the kettle pressure in the hydrolysis kettle gradually decreases, the spherical sealing block and the circular trigger block will move downward along the detection frame. When the circular trigger block is separated from the trigger groove, the sensing data and the detection data will be transmitted to the kettle pressure automatic control processing unit through the kettle pressure detection module and the infrared sensor module respectively, and the kettle pressure automatic control unit will transmit the data to the pressure relief module and the closing module respectively, so that the pressure relief module will transmit the instruction to the pressure relief component and restore the pressure relief component to its original position, and the closing module will transmit the instruction to the closing component and restore the closing component to its original position. After that, the hydrolysis operation will continue until all the lime nitrogen has been hydrolyzed, and all operations are terminated.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. In the present invention, the feeding component drives the circular sealing plate through a bidirectional threaded rod, which can quickly cut off the input of lime nitrogen and water when the pressure is abnormal. When the pressure relief component is opened, if the infrared sensor detects that the pressure continues to rise, for example, the discharge port is blocked and causes material imbalance, the system automatically starts the second drive motor and drives the circular sealing plate to seal the feeding channel through the L-shaped sliding block to avoid the reaction heat release and gas production caused by continuous feeding. This feeding and pressure linkage control breaks the limitation of "only pressure relief without material control" in the traditional process, suppresses the fundamental cause of pressure increase from the source, realizes the dynamic coupling of material balance and pressure balance, significantly improves the stability of the system, and increases the service life of the device.

[0022] 2. In the present invention, the air pressure in the kettle is converted into a mechanical displacement signal through the spherical sealing block and the circular trigger block of the kettle pressure detection assembly, and the real-time and accurate monitoring of the pressure is realized in conjunction with the sensor and the infrared sensor. When the air pressure rises to the preset threshold, the circular trigger block contacts the trigger groove, automatically triggering the hydraulic pump of the pressure relief assembly, and quickly lifting the sealing block through the hydraulic rod to open the pressure relief pipe to release ammonia. This mechanical and electronic linkage mechanism avoids the drift problem of traditional pressure sensors in highly corrosive environments, has a fast response speed, and through the multi-level threshold design, realizes a stepped safety protection from "early warning, pressure relief, and material cut-off", effectively preventing equipment damage and explosion risks caused by pressure out of control.

[0023] 3. In the present invention, ammonia gas discharged from the pressure relief pipe is introduced into the ammonia storage chamber through a cooling pipe, thereby realizing resource recovery of ammonia gas and avoiding environmental pollution and waste of raw materials caused by direct discharge. In addition, the system can optimize the temperature and concentration fields of the hydrolysis reaction by precisely controlling the feed amount and pressure, inhibit side reactions, and improve the yield and purity of calcium cyanamide. At the same time, it reduces product quality fluctuations caused by pressure fluctuations, thereby achieving a dual improvement in process efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 Schematic diagram of the internal structure of the present invention;

[0026] Figure 3 It is a partial structural schematic diagram of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the pressure relief assembly of the present invention;

[0028] Figure 5 It is a schematic side view of the structure of the pressure relief assembly of the present invention;

[0029] Figure 6 This is a schematic structural diagram of the kettle pressure detection assembly of the present invention;

[0030] Figure 7 It is a schematic structural diagram of the feed assembly of the present invention;

[0031] Figure 8 This is a system structure diagram of the present invention.

[0032] Explanation of the reference numerals in the figure: 1. Device body; 2. First drive motor; 3. First rotating rod; 4. Stirring rod; 5. Feed assembly; 501. First feed pipe; 502. First sealing block; 503. L-shaped slide; 504. Bidirectional threaded rod; 505. L-shaped sliding block; 506. Circular sealing plate; 507. Second drive motor; 508. Second feed pipe; 509. Metering pump; 510. Third feed pipe; 6. Pressure relief assembly ; 601, pressure relief frame; 602, annular sealing block; 603, annular sealing groove; 604, hydraulic pump; 605, hydraulic rod; 606, sealing block; 607, annular sealing block; 608, pressure relief pipe; 7, kettle pressure detection assembly; 701, detection frame; 702, circular connecting block; 703, trigger groove; 704, annular blocking block; 705, sliding block; 706, spherical sealing block; 707, circular trigger block. DETAILED DESCRIPTION

[0033] Example: See Figure 1 、 Figure 2 and Figure 3 A device for automatically controlling kettle pressure of a lime nitrogen hydrolysis kettle comprises a device body 1, a feeding assembly 5 is connected to one side of the upper end of the device body 1, a pressure relief assembly 6 is connected to one end of the feeding assembly 5, and a kettle pressure detection assembly 7 is connected to one end of the pressure relief assembly 6;

[0034] See also Figure 6 The kettle pressure detection assembly 7 includes a detection frame 701, the upper end of the inner cavity of the detection frame 701 is connected to a circular connecting block 702, and the lower end surface of the circular connecting block 702 is provided with a trigger groove 703, and the inner cavity of the detection frame 701 away from the circular connecting block 702 is connected to an annular blocking block 704, the upper end of the annular blocking block 704 is connected to a sliding block 705, the upper end of the sliding block 705 is connected to a spherical sealing block 706, the upper end of the spherical sealing block 706 is connected to a circular trigger block 707, and the lower end of the detection frame 701 is connected to the stirring chamber, and the inner cavity of the circular connecting block 702 is connected to a sensor and an infrared sensor;

[0035] See also Figure 7 The feeding assembly 5 includes a first feeding pipe 501, the lower end of the first feeding pipe 501 is connected to a first sealing block 502, an L-shaped slide groove 503 is opened in the inner cavity of the first sealing block 502, a bidirectional threaded rod 504 is connected to the inner cavity of the L-shaped slide groove 503, both ends of the bidirectional threaded rod 504 are connected to L-shaped sliding blocks 505, and the end of the L-shaped sliding block 505 away from the bidirectional threaded rod 504 is connected to a circular sealing plate 506.

[0036] Specifically, the feed assembly 5 drives the circular sealing plate 506 via the bidirectional threaded rod 504, which can quickly cut off the input of lime nitrogen and water when the pressure is abnormal. When the pressure relief assembly 6 is turned on, if the infrared sensor detects that the pressure continues to rise, for example, the discharge port is blocked, causing material imbalance, the system automatically starts the second drive motor 507, which drives the circular sealing plate 506 to seal the feed channel through the L-shaped sliding block 505 to avoid the reaction exotherm and gas production caused by continuous feeding. This feed and pressure linkage control breaks the limitation of "only pressure relief without material control" in traditional processes, suppresses the root cause of pressure increase from the source, realizes the dynamic coupling of material balance and pressure balance, significantly improves the stability of the system, and increases the service life of the device.

[0037] See also Figure 2 The upper end of the device body 1 is connected to the first drive motor 2, the lower end of the first drive motor 2 is connected to the first rotating rod 3, the lower end surface of the first rotating rod 3 is connected to a plurality of stirring rods 4, and a stirring chamber is installed in the inner cavity of the device body 1, and the stirring rods 4 are installed in the stirring chamber, the inner cavity surface of the device body 1 is connected to the reaction tank cooling jacket, the inner surface of the reaction tank cooling jacket is connected to the cooling coil, and a fixed bracket is installed on the outside of the device body 1.

[0038] See also Figure 7 One end of the bidirectional threaded rod 504 is connected to a second drive motor 507, a second feed pipe 508 is connected just below the first feed pipe 501, an end of the first sealing block 502 away from the first feed pipe 501 is connected to a metering pump 509, a third feed pipe 510 is connected just below the metering pump 509, and a circular sealing plate 506 is connected between the first feed pipe 501 and the second feed pipe 508, and a circular sealing plate 506 is connected between the metering pump 509 and the third feed pipe 510. At this time, the circular sealing plate 506 plays a sealing role, and the second feed pipe 501 is connected to the second feed pipe 508. 08 and the lower ends of the third feed pipe 510 are both connected to the stirring chamber, and the circular sealing plate 506 is initially separated from the feed pipe. Semi-arc sealing plates are connected at both ends of the lower end discharge ports of the third feed pipe 510 and the second feed pipe 508, and the upper end surface of the semi-arc sealing plate is connected to an inclined return spring. When water and lime nitrogen generate a thrust on the semi-arc sealing plate, the inclined return spring will be stretched, thereby allowing the two semi-arc sealing plates to be expanded, and then the raw materials will be transported to the stirring chamber. When the raw materials are stopped being transported, the semi-arc sealing plates will return to their original positions.

[0039] See also Figure 4The pressure relief assembly 6 includes a pressure relief frame 601, the lower end of the pressure relief frame 601 is connected to an annular sealing block 602, the upper end surface of the annular sealing block 602 is provided with a plurality of annular sealing grooves 603, and the outer surface of the pressure relief frame 601 is connected to a pressure relief pipe 608, and the end of the pressure relief pipe 608 away from the pressure relief frame 601 is connected to a cooling pipe, and the end of the cooling pipe away from the pressure relief pipe 608 is connected to an ammonia storage chamber.

[0040] Specifically, the ammonia gas discharged from the pressure relief pipe 608 is introduced into the ammonia storage chamber through the cooling pipe, thereby realizing the resource recovery of the ammonia gas and avoiding environmental pollution and waste of raw materials caused by direct discharge. In addition, the system can optimize the temperature field and concentration field of the hydrolysis reaction by precisely controlling the feed amount and pressure, inhibit side reactions, and improve the yield and purity of calcium cyanamide. At the same time, it reduces the fluctuation of product quality caused by pressure fluctuations, thereby achieving a dual improvement in process efficiency and product quality.

[0041] See also Figure 5 The upper end of the pressure relief frame 601 is connected to a hydraulic pump 604, the lower end of the hydraulic pump 604 is connected to a hydraulic rod 605, the lower end of the hydraulic rod 605 is connected to a sealing block 606, and the lower end surface of the sealing block 606 is connected to several annular sealing blocks 607, and the annular sealing blocks 607 coincide with the initial position of the annular sealing groove 603.

[0042] See also Figure 8 The device body 1 is equipped with a kettle pressure automatic control system, which includes a kettle pressure automatic control processing unit. The input end of the kettle pressure automatic control processing unit is connected to the kettle pressure detection module and the infrared sensor module, and the output end of the kettle pressure automatic control processing unit is connected to the pressure relief module and the closing module. The outer surface of the device body 1 is connected to a control panel, and the control panel is equipped with a kettle pressure automatic control processing unit.

[0043] The input end of the kettle pressure detection module is connected to the data input end of the pressure relief component 6 for signal connection, and the output end of the pressure relief module is connected to the data output end of the pressure relief component 6 for signal connection.

[0044] The input end of the infrared sensor module is connected to the data input end of the feeding component 5 by signal, and the output end of the closing module is connected to the data output end of the feeding component 5 by signal.

[0045] Specifically, the air pressure in the kettle is converted into a mechanical displacement signal through the spherical sealing block 706 and the circular trigger block 707 of the kettle pressure detection component 7, and the real-time and accurate monitoring of the pressure is realized in conjunction with the sensor and the infrared sensor. When the air pressure rises to the preset threshold, the circular trigger block 707 contacts the trigger groove 703, automatically triggering the hydraulic pump 604 of the pressure relief component 6, and quickly lifting the sealing block 606 through the hydraulic rod 605, opening the pressure relief pipe 608 to release ammonia. This mechanical and electronic linkage mechanism avoids the drift problem of traditional pressure sensors in highly corrosive environments, has a fast response speed, and through a multi-level threshold design, realizes a stepped safety protection from "early warning, pressure relief, and material cut-off", effectively preventing equipment damage and explosion risks caused by pressure out of control.

[0046] A method for using a lime-nitrogen hydrolysis kettle pressure automatic control device comprises the following steps:

[0047] S1. First, the lime nitrogen and water are respectively delivered to the stirring chamber through the first feed pipe 501 and the metering pump 509, and then through the second feed pipe 508 and the third feed pipe 510. Then, the first drive motor 2 is started through the control panel, and the first rotating rod 3 is driven to rotate, thereby driving the stirring rod 4 to rotate, thereby stirring the lime nitrogen and water. As the lime nitrogen and water are continuously stirred, a hydrolysis reaction occurs, thereby generating calcium cyanamide solution and ammonia gas. As ammonia gas is continuously generated, the air pressure in the hydrolysis kettle increases, and the generated air pressure is released through the first pressure relief port connected to the upper surface of the device body 1. However, when the rate of ammonia generation in the hydrolysis kettle is higher than the discharge rate of the hydrolysis kettle, the continuous increase in the air pressure in the hydrolysis kettle will generate a thrust on the spherical sealing block 706, causing the spherical sealing block 706 to move upward along the detection frame 701, thereby driving the circular trigger block 707 to move upward until the circular trigger block 707 contacts the trigger groove 703;

[0048] S2. When the circular trigger block 707 contacts the trigger groove 703, the sensor transmits the sensor data to the kettle pressure automatic control processing unit through the kettle pressure detection module, and the kettle pressure automatic control unit transmits the start instruction to the pressure relief assembly 6, and starts the hydraulic pump 604, which then drives the hydraulic rod 605 to perform a contraction operation, thereby causing the sealing block 606 and the annular sealing block 607 to move upward along the inner cavity of the pressure relief frame 601 until they leak out of the pressure relief port of the pressure relief pipe 608;

[0049] S3. When the pressure relief port of the pressure relief pipe 608 is leaked, the infrared sensor will detect whether the circular trigger block 707 will continue to move upward along the trigger groove 703. If the infrared sensor detects that the circular trigger block 707 continues to move upward, the detection data will be transmitted to the kettle pressure automatic control processing unit through the infrared sensor module. Then, the kettle pressure automatic control processing unit starts the second drive motor 507 and drives the bidirectional threaded rod 504 to rotate, thereby driving the L-shaped sliding block 505 and the circular sealing plate 506 to move along the L-shaped slide groove 503 toward the two ends of the bidirectional threaded rod 504 until the circular sealing plate 506 coincides with the gap formed by the first feeding pipe 501 and the second feeding pipe 508 and the gap between the metering pump 509 and the third feeding pipe 510. At this time, the circular sealing plate 506 performs a sealing operation on the first feeding pipe 501 and the metering pump 509, thereby preventing water and lime nitrogen from being transported into the stirring chamber.

[0050] S4. When the kettle pressure in the hydrolysis kettle gradually decreases, the spherical sealing block 706 and the circular trigger block 707 will move downward along the detection frame 701. When the circular trigger block 707 is separated from the trigger groove 703, the sensing data and the detection data will be transmitted to the kettle pressure automatic control processing unit through the kettle pressure detection module and the infrared sensor module respectively, and the kettle pressure automatic control unit will transmit the data to the pressure relief module and the closing module respectively, so that the pressure relief module will transmit the instruction to the pressure relief component 6 and restore the pressure relief component 6 to its original position, and the closing module will transmit the instruction to the feeding component 5 and restore the feeding component 5 to its original position. After that, the hydrolysis operation will continue until all the lime nitrogen has completed the hydrolysis operation, and all operations are terminated.

[0051] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for automatically controlling the pressure of a lime nitrogen hydrolysis kettle, comprising a device body (1), characterized in that: A feeding assembly (5) is connected to one side of the upper end of the device body (1), one end of the feeding assembly (5) is connected to a pressure relief assembly (6), and one end of the pressure relief assembly (6) is connected to a kettle pressure detection assembly (7); The kettle pressure detection assembly (7) comprises a detection frame (701), the upper end of the inner cavity of the detection frame (701) is connected to a circular connecting block (702), the lower end surface of the circular connecting block (702) is provided with a triggering groove (703), and the inner cavity of the detection frame (701) is connected to an annular blocking block (704) at one end away from the circular connecting block (702), the upper end of the annular blocking block (704) is connected to a sliding block (705), the upper end of the sliding block (705) is connected to a spherical sealing block (706), and the upper end of the spherical sealing block (706) is connected to a circular triggering block (707); The feeding assembly (5) includes a first feeding pipe (501), the lower end of the first feeding pipe (501) is connected to a first sealing block (502), an L-shaped sliding groove (503) is provided in the inner cavity of the first sealing block (502), a bidirectional threaded rod (504) is connected in the inner cavity of the L-shaped sliding groove (503), both ends of the bidirectional threaded rod (504) are connected to L-shaped sliding blocks (505), and the end of the L-shaped sliding block (505) away from the bidirectional threaded rod (504) is connected to a circular sealing plate (506).

2. The automatic control device for the pressure of a lime nitrogen hydrolysis kettle according to claim 1, characterized in that: The upper end of the device body (1) is connected to a first drive motor (2), the lower end of the first drive motor (2) is connected to a first rotating rod (3), and the lower end surface of the first rotating rod (3) is connected to a plurality of stirring rods (4).

3. The automatic control device for the pressure of a lime nitrogen hydrolysis kettle according to claim 2, characterized in that: One end of the bidirectional threaded rod (504) is connected to a second drive motor (507), a second feed pipe (508) is connected directly below the first feed pipe (501), an end of the first sealing block (502) away from the first feed pipe (501) is connected to a metering pump (509), and a third feed pipe (510) is connected directly below the metering pump (509).

4. The automatic control device for the pressure of a lime nitrogen hydrolysis kettle according to claim 3, characterized in that: The pressure relief assembly (6) comprises a pressure relief frame (601), the lower end of the pressure relief frame (601) is connected to an annular sealing block (602), the upper end surface of the annular sealing block (602) is provided with a plurality of annular sealing grooves (603), and the outer surface of the pressure relief frame (601) is connected to a pressure relief pipe (608).

5. The automatic control device for the pressure of a lime nitrogen hydrolysis kettle according to claim 4, characterized in that: The upper end of the pressure relief frame (601) is connected to a hydraulic pump (604), the lower end of the hydraulic pump (604) is connected to a hydraulic rod (605), the lower end of the hydraulic rod (605) is connected to a sealing block (606), and the lower end surface of the sealing block (606) is connected to a plurality of annular sealing blocks (607).

6. The automatic control device for the pressure of a lime nitrogen hydrolysis kettle according to claim 5, characterized in that: The device body (1) is equipped with a kettle pressure automatic control system, which includes a kettle pressure automatic control processing unit. The input end of the kettle pressure automatic control processing unit is connected to a kettle pressure detection module and an infrared sensor module, and the output end of the kettle pressure automatic control processing unit is connected to a pressure relief module and a closing module. The outer surface of the device body (1) is connected to a control.

7. The automatic control device for the pressure of a lime nitrogen hydrolysis kettle according to claim 6, characterized in that: The input end of the kettle pressure detection module is signal-connected to the data input end of the pressure relief component (6), and the output end of the pressure relief module is signal-connected to the data output end of the pressure relief component (6).

8. The automatic control device for the pressure of a lime-nitrogen hydrolysis kettle according to claim 7, characterized in that: The input end of the infrared sensor module is signal-connected to the data input end of the feed component (5), and the output end of the closing module is signal-connected to the data output end of the feed component (5).

9. A method for using a lime-nitrogen hydrolysis kettle pressure automatic control device, according to claim 8, characterized in that: The following steps are involved: S1. First, lime nitrogen and water are respectively fed into the stirring chamber through the first feeding pipe (501) and the metering pump (509), and then fed into the stirring chamber through the second feeding pipe (508) and the third feeding pipe (510). Then, the first driving motor (2) is started through the control panel, and the first rotating rod (3) is driven to rotate, thereby driving the stirring rod (4) to rotate, thereby stirring the lime nitrogen and water. As the lime nitrogen and water are continuously stirred, a hydrolysis reaction occurs, thereby generating calcium cyanamide solution and ammonia gas. As the ammonia gas is continuously generated, the temperature increases. The air pressure in the hydrolysis kettle is increased, and the generated air pressure will be released through the first pressure relief port connected to the upper surface of the device body (1). However, when the rate of ammonia generated in the hydrolysis kettle is higher than the discharge rate of the hydrolysis kettle, the air pressure in the hydrolysis kettle will continue to increase, which will generate a thrust on the spherical sealing block (706), thereby causing the spherical sealing block (706) to move upward along the detection frame (701), thereby driving the circular trigger block (707) to move upward until the circular trigger block (707) contacts the trigger groove (703); S2. When the circular trigger block (707) contacts the trigger groove (703), the sensor transmits the sensor data to the kettle pressure automatic control processing unit through the kettle pressure detection module, and the kettle pressure automatic control unit transmits the start instruction to the pressure relief component (6), and starts the hydraulic pump (604), and then drives the hydraulic rod (605) to perform a contraction operation, so that the sealing block (606) and the annular sealing block (607) move upward along the inner cavity of the pressure relief frame (601) until they leak out of the pressure relief port of the pressure relief pipe (608); S3. When the pressure relief port of the pressure relief pipe (608) leaks out, the infrared sensor will detect whether the circular trigger block (707) will continue to move upward along the trigger groove (703). If the infrared sensor detects that the circular trigger block (707) continues to move upward, the detection data will be transmitted to the kettle pressure automatic control processing unit through the infrared sensor module. Then, the kettle pressure automatic control processing unit will start the second drive motor (507) and drive the bidirectional threaded rod (504) to rotate, thereby driving the L-shaped sliding block ( 505) and the circular sealing plate (506) move along the L-shaped chute (503) toward the two ends of the bidirectional threaded rod (504) until the circular sealing plate (506) coincides with the gap formed by the first feeding pipe (501) and the second feeding pipe (508) and the gap between the metering pump (509) and the third feeding pipe (510). At this time, the circular sealing plate (506) performs a sealing operation on the first feeding pipe (501) and the metering pump (509), thereby preventing water and lime nitrogen from being transported into the stirring chamber; S4. When the pressure in the hydrolysis kettle gradually decreases, the spherical sealing block (706) and the circular trigger block (707) will move downward along the detection frame (701). When the circular trigger block (707) is separated from the trigger groove (703), the sensing data and the detection data will be respectively transmitted to the kettle pressure automatic control processing unit through the kettle pressure detection module and the infrared sensor module, and the kettle pressure automatic control unit will transmit the data to the pressure relief module and the closing module respectively, so that the pressure relief module will transmit the instruction to the pressure relief component (6) and the pressure relief component (6) will return to its original position. In addition, the closing module will transmit the instruction to the feeding component (5) and the feeding component (5) will return to its original position. After that, the hydrolysis operation will continue until all the lime nitrogen has completed the hydrolysis operation, and all operations are terminated.

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