A fine slag treatment system for settling tanks

Abstract

This invention provides a fine slag treatment system for a settling tank, including a settling tank, a locking hopper, a feeding channel, a shut-off valve, a slag discharge channel, a slag discharge valve, a pressurizing channel, a pressurizing valve, a pressure relief channel, a pressure relief valve, and a control unit. The fine slag feeding port at the bottom of the settling tank is connected to the locking hopper via the feeding channel, and a shut-off valve is installed on the feeding channel. A slag removal machine is connected to the bottom of the locking hopper via the slag discharge channel, and a slag discharge valve is installed on the slag discharge channel. This invention sets up a feeding channel at the bottom of the settling tank and connects it to the locking hopper. Through the control unit, the shut-off valve, slag discharge valve, pressurizing valve, and pressure relief valve are linked to achieve automatic pressurized discharge of fine slag and its co-processing with coarse slag, eliminating the need for traditional pumping and filtration, avoiding fly ash generation, and reducing pollution risks. Simultaneously, relying on a signal acquisition and control module, it achieves fully automatic operation of the fine slag treatment, improving the system's automation level and reducing equipment wear and operating costs.

Description

Technical Field

[0001] This utility model relates to a processing system, specifically a fine slag processing system for a settling tank, and belongs to the field of chemical equipment technology. Background Technology

[0002] Coal gasification is an important clean energy conversion technology that is widely used in chemical, metallurgical and other fields. During the coal gasification process, the complete combustion of coal produces two types of solid waste: coarse slag and fine slag. The coarse slag is usually discharged into the slag remover through a lock hopper system and then discharged from the system, while the fine slag is mixed in the black water and requires further sedimentation and solid-liquid separation treatment.

[0003] Currently, the conventional treatment process for fine ash is as follows: concentrated black water treated under negative pressure in a vacuum flash tank is introduced into a settling tank, flocculant is added to the settling tank to accelerate the settling of fine ash particles, and then a slow-rotating rake is used to scrape the settled fine ash to the bottom of the settling tank, and then the material is pumped to a plate and frame filter press or a vacuum belt filter for filter pressing or dewatering.

[0004] However, this traditional treatment method has several problems. It involves a long process, complex equipment, and high operating costs. Furthermore, the material pump at the bottom of the settling tank is easily worn down by fine slag, affecting system stability. Simultaneously, the filter cake formed during filtration and dewatering can generate fly ash during discharge, causing secondary environmental pollution. In addition, separating fine and coarse slag for treatment is not conducive to subsequent unified hazardous waste disposal management. Utility Model Content

[0005] Based on the above background, the purpose of this utility model is to provide a settling tank fine slag treatment system with simplified structure, high degree of automation, reduced pollution, and the ability to co-process fine and coarse slag, thereby solving the problems mentioned in the background art.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0007] A fine slag treatment system for a settling tank includes a settling tank, a lock hopper, a feeding channel, a shut-off valve, a slag discharge channel, a slag discharge valve, a pressurization channel, a pressurization valve, a pressure relief channel, a pressure relief valve, and a control unit;

[0008] The fine slag discharge port at the bottom of the settling tank is connected to the lock hopper through a discharge channel, and a shut-off valve is installed on the discharge channel;

[0009] The bottom of the lock hopper is connected to a slag removal machine via a slag discharge channel, and a slag discharge valve is installed on the slag discharge channel;

[0010] The top of the lock bucket is connected to a low-pressure grey water source via a pressurization channel, and a pressurization valve is installed on the pressurization channel.

[0011] One end of the pressure relief channel is connected to the settling tank, and the other end of the pressure relief channel is connected to the pressure boosting channel located between the lock hopper and the pressure boosting valve;

[0012] The control units are all connected to the shut-off valve, slag discharge valve, pressure boosting valve, and pressure relief valve via signal connection.

[0013] Preferably, a pressure transmitter is installed on the pressurization channel adjacent to the lock bucket, and the pressure transmitter is signal-connected to the control unit.

[0014] Preferably, the shut-off valve, slag discharge valve, pressure boosting valve, and pressure relief valve are all equipped with valve position switches that detect the open and closed status.

[0015] Preferably, the control unit includes a signal acquisition module, a logic control module, and an execution control module; the signal acquisition module is connected to the pressure transmitter and the valve position switch installed on the shut-off valve, slag discharge valve, pressure boosting valve, and pressure relief valve, respectively; the logic control module is connected to the signal acquisition module and the execution control module; and the execution control module is connected to the shut-off valve, slag discharge valve, pressure boosting valve, and pressure relief valve, respectively.

[0016] Preferably, the logic control module has a built-in timing control program.

[0017] Preferably, the inner wall of the lock bucket is provided with a silicon carbide wear-resistant lining, the thickness of which is 5-8 mm.

[0018] Preferably, the pressure relief channel is connected to the settling tank at the top of the gas phase space of the settling tank.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] This utility model discloses a fine slag treatment system for a settling tank. A feeding channel is installed at the fine slag discharge port at the bottom of the settling tank and connected to a locking hopper. Shut-off valves, slag discharge valves, pressure boosting valves, and pressure relief valves are respectively installed on the feeding channel, slag discharge channel, pressure boosting channel, and pressure relief channel. An orderly linkage control of these valves is achieved through a control unit, thus eliminating the need for the traditional system's reliance on a settling tank bottom pump and plate and frame filter press or vacuum belt filter. After being collected by the locking hopper, the fine slag is pressurized by introducing low-pressure ash water through the pressure boosting channel, and then directly discharged into a slag remover through the slag discharge channel for co-processing with coarse slag. This avoids the generation of fly ash during filter cake discharge, reducing the risk of environmental pollution. Furthermore, through the signal acquisition module, logic control module, and execution control module within the control unit, the pressure transmitter and valve position switch signals are identified and responded to, achieving fully automatic operation of the fine slag treatment process, significantly improving the level of automation and reducing equipment wear and operating costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the functional modules of the control unit of this utility model.

[0024] In the diagram: 1. Settling tank; 2. Locking hopper; 3. Discharge channel; 4. Shut-off valve; 5. Slag discharge channel; 6. Slag discharge valve; 7. Pressure boosting channel; 8. Pressure boosting valve; 9. Pressure relief channel; 10. Pressure relief valve; 11. Control unit; 1101. Signal acquisition module; 1102. Logic control module; 1102-1. Timing control program; 1103. Execution control module; 12. Pressure transmitter. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0026] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the field. Unless otherwise specified, the methods in the following embodiments are conventional methods in the field. Unless otherwise specified, the components or equipment in the following embodiments are general standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following detailed description, many specific details are set forth to facilitate explanation and provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may be practiced by those skilled in the art without these specific details.

[0028] like Figure 1 and Figure 2As shown, a fine slag treatment system for a settling tank includes a settling tank 1, a locking hopper 2, a feeding channel 3, a shut-off valve 4, a slag discharge channel 5, a slag discharge valve 6, a pressurization channel 7, a pressurization valve 8, a pressure relief channel 9, a pressure relief valve 10, and a control unit 11. The bottom of the settling tank 1 is provided with a fine slag feeding port, which is connected to the locking hopper 2 through the feeding channel 3. A shut-off valve 4 is installed on the feeding channel 3. The locking hopper 2 is used to periodically collect the fine slag settled in the settling tank 1. Its bottom is connected to a slag remover through the slag discharge channel 5. A slag discharge valve 6 is installed on the slag discharge channel 5 to control the discharge process of the fine slag.

[0029] To enable the conveying of fine slag without the need for a material pump, the top of the lock hopper 2 is connected to a low-pressure ash water source via a pressurization channel 7. A pressurization valve 8 is installed on the pressurization channel 7 to inject low-pressure ash water into the lock hopper 2 to provide power for slag discharge. Simultaneously, to release internal pressure after slag discharge, one end of the pressure relief channel 9 is connected to the settling tank 1, and the other end is connected to the pressurization channel 7 at the position between the lock hopper 2 and the pressurization valve 8. A pressure relief valve 10 is installed on the pressure relief channel 9 to control the venting process.

[0030] To achieve fully automated control, the control unit 11 is connected to the shut-off valve 4, slag discharge valve 6, pressure boosting valve 8, and pressure relief valve 10 via signal connections, respectively, to coordinate the opening and closing sequence of these valves. Preferably, a pressure transmitter 12 is installed on the pressure boosting channel 7 adjacent to the lock hopper 2 and is connected to the control unit 11 via signal connections to monitor the internal pressure of the lock hopper 2 in real time. Valve position switches are installed on the shut-off valve 4, slag discharge valve 6, pressure boosting valve 8, and pressure relief valve 10 to provide feedback on the current opening and closing status of the valves.

[0031] The control unit 11 includes a signal acquisition module 1101, a logic control module 1102, and an execution control module 1103. The signal acquisition module 1101 is connected to the pressure transmitter 12 and the valve position switches of the shut-off valve 4, slag discharge valve 6, pressure boosting valve 8, and pressure relief valve 10. The logic control module 1102 is connected to the signal acquisition module 1101 and the execution control module 1103, and is used to determine the operating conditions based on the feedback signals. The execution control module 1103 outputs control signals to implement the action commands for the shut-off valve 4, slag discharge valve 6, pressure boosting valve 8, and pressure relief valve 10. The logic control module 1102 has a built-in timing control program 1102-1, which is used to complete the control processes such as timed collection of fine slag, pressure boosting and slag discharge, and pressure relief and reset.

[0032] In actual operation, fine slag enters lock hopper 2 from the bottom of settling tank 1 for periodic collection. The specific steps include the following:

[0033] 1. Fine slag collection stage: The shut-off valve 4 is opened, and the slag discharge valve 6, pressure boosting valve 8, and pressure relief valve 10 are closed. The fine slag in the settling tank 1 falls into the lock hopper 2 through the discharge channel 3 for collection. The control unit 11 controls the collection duration to 30 minutes through a built-in timer program.

[0034] 2. Pressurized Slag Discharge Stage: After collection is completed, the control unit 11 closes the shut-off valve 4 and opens the pressure boosting valve 8, injecting low-pressure ash water into the lock hopper 2 through the pressure boosting channel 7 to raise the pressure inside the lock hopper 2 to the set value of 0.4 MPa. When the pressure transmitter 12 detects the target pressure, the control unit 11 issues a command to open the slag discharge valve 6. Under pressure, the fine slag in the lock hopper 2 is discharged into the slag remover through the slag discharge channel 5 and mixed with the coarse slag.

[0035] 3. Pressure relief and reset stage: After slag discharge continues for 5 minutes, the control unit 11 closes the pressure boosting valve 8 and opens the pressure relief valve 10 to release the pressure of the lock hopper 2 to the set value of 0.1MPa, and then closes the slag discharge valve 6 to prepare for the next round of collection.

[0036] 4. Cyclic Operation: Control unit 11 reopens shut-off valve 4, and lock hopper 2 starts collecting fine residue again, forming an automatic cycle.

[0037] To enhance the durability of this system, the inner wall of the lock hopper 2 is preferably provided with a silicon carbide wear-resistant lining with a thickness of 5-8 mm, which is used to resist the long-term erosion and wear of fine slag particles on the inner wall of the lock hopper 2 and improve the service life of the system.

[0038] The implementation principle of the fine slag treatment system for settling tanks of this utility model is as follows:

[0039] A fine slag discharge port is set at the bottom of the settling tank 1, and it is connected to the lock hopper 2 via the discharge channel 3 to achieve intermittent gravity collection of fine slag. The control unit 11 controls the opening and closing sequence of the shut-off valve 4, the slag discharge valve 6, the pressure boosting valve 8, and the pressure relief valve 10 according to the set time cycle. After the lock hopper 2 is full of fine slag, the shut-off valve 4 is closed to isolate the lock hopper 2 from the settling tank 1. Then, the pressure boosting valve 8 is opened to introduce low-pressure ash water to pressurize the lock hopper 2. When the pressure reaches the set value, the slag discharge valve 6 is opened, allowing the fine slag to be discharged into the slag removal machine through the slag discharge channel 5 under pressure. After the slag is discharged, the pressure boosting valve 8 is closed and the pressure relief valve 10 is opened to release the internal pressure of the lock hopper 2. Then, the shut-off valve 4 is opened again for the next round of fine slag collection. In this way, the automatic collection and discharge of fine slag is achieved without using the bottom material pump and filtration equipment of the settling tank 1. This not only simplifies the processing flow and reduces system wear, but also improves the level of automation and the efficiency of co-processing fine and coarse slag.

[0040] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments 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 fine slag treatment system for a settling tank, characterized in that: The settling tank fine slag treatment system includes a settling tank (1), a lock hopper (2), a feeding channel (3), a shut-off valve (4), a slag discharge channel (5), a slag discharge valve (6), a pressure boosting channel (7), a pressure boosting valve (8), a pressure relief channel (9), a pressure relief valve (10), and a control unit (11). The fine slag discharge port at the bottom of the settling tank (1) is connected to the lock hopper (2) through the discharge channel (3), and a shut-off valve (4) is installed on the discharge channel (3). The bottom of the lock bucket (2) is connected to a slag removal machine through a slag discharge channel (5), and a slag discharge valve (6) is installed on the slag discharge channel (5). The top of the lock bucket (2) is connected to a low-pressure ash water source through a pressurization channel (7), and a pressurization valve (8) is installed on the pressurization channel (7). One end of the pressure relief channel (9) is connected to the settling tank (1), and the other end of the pressure relief channel (9) is connected to the pressure boosting channel (7) located between the lock bucket (2) and the pressure boosting valve (8); The control unit (11) is connected to the shut-off valve (4), the slag discharge valve (6), the pressure boosting valve (8), and the pressure relief valve (10).

2. The settling tank fine slag treatment system according to claim 1, characterized in that: A pressure transmitter (12) is installed on the pressurization channel (7) adjacent to the lock bucket (2), and the pressure transmitter (12) is signal-connected to the control unit (11).

3. The settling tank fine slag treatment system according to claim 2, characterized in that: The shut-off valve (4), slag discharge valve (6), pressure boosting valve (8) and pressure relief valve (10) are all equipped with valve position switches that detect the opening and closing status.

4. The settling tank fine slag treatment system according to claim 3, characterized in that: The control unit (11) includes a signal acquisition module (1101), a logic control module (1102), and an execution control module (1103). The signal acquisition module (1101) is connected to the pressure transmitter (12) and the valve position switch installed on the shut-off valve (4), the slag discharge valve (6), the pressure boosting valve (8), and the pressure relief valve (10). The logic control module (1102) is connected to the signal acquisition module (1101) and the execution control module (1103). The execution control module (1103) is connected to the shut-off valve (4), the slag discharge valve (6), the pressure boosting valve (8), and the pressure relief valve (10).

5. The settling tank fine slag treatment system according to claim 4, characterized in that: The logic control module (1102) has a built-in timing control program (1102-1).

6. The settling tank fine slag treatment system according to claim 5, characterized in that: The inner wall of the lock bucket (2) is provided with a silicon carbide wear-resistant lining, the thickness of which is 5-8 mm.

7. The settling tank fine slag treatment system according to claim 6, characterized in that: The pressure relief channel (9) is connected to the settling tank (1) at the top of the gas phase space of the settling tank (1).

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