Water circulation structure of deslagging system

Abstract

The utility model provides a water circulation structure of a deslagging system, which relates to the technical field of boiler systems, and comprises a boiler hearth, a slag conveyor, a slag water tank, a thickener and a clean water tank, the slag conveyor is arranged below the boiler hearth, the output end of the slag conveyor is connected with the slag water tank, the output end of the slag water tank is connected with the thickener, and the clean water tank is connected with the thickener. A clear water discharge end of the thickener is connected with a clear water tank; water seals are arranged on the two sides of the boiler hearth, and the bottom of the clean water tank is connected with a leading-in pipeline; the furnace bottom water seal system is contained in water circulation of the slag removal system, the clear water tank and the water seal area are connected through the introduction pipeline, the water inlet amount and pressure entering the water seal are controlled, slag water is introduced into the water seal, accumulated ash in the water seal is washed by the slag water, the deposition phenomenon is avoided, and the defects of shell deformation, cracking and the like caused by uneven cooling are avoided; not only is on-site difficult problems eliminated, but also the sealing performance of the unit is improved, and the environmental protection problem caused by excessive oxygen content due to air leakage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of boiler system technology, and in particular to a water circulation structure for a slag removal system. Background Technology

[0002] The operation of the furnace bottom water seal system in thermal power plants requires the use of a large amount of industrial water and also generates a large amount of wastewater, which wastes water resources and causes environmental pollution. As the environmental protection requirements of power plants become more stringent, thermal power plants are gradually achieving zero-emission capabilities. By modifying the water circulation of the slag removal system, thermal power plants can save water resources and achieve zero wastewater discharge from the slag removal system while ensuring the safe, economical and stable operation of the unit.

[0003] The bottom water seal of a thermal power plant uses industrial water and lacks a drainage system for blowdown. It relies on overflow to ensure a full water level inside the seal, fulfilling design requirements for airtightness, boiler oxygen control, and furnace pressure adjustment. Figure 2 The water overflowing from the water seal chamber flows through the inner wall of the slag well into the slag removal machine. However, in actual operation, in order to save water resources, the overflow water volume is reduced. As a result, the slag and ash fall into the water seal trough and cannot be discharged with the water flow. This causes the water seal trough to deform and crack due to uneven cooling, which seriously affects the boiler's economic efficiency, environmental protection indicators and unit safety.

[0004] The specific reason is that during operation, the combustion of pulverized coal in the boiler furnace produces a large amount of ash and slag. Due to gravity, the ash and slag fall into the slag remover in the furnace. However, due to the flow field and collisions between objects, some ash and smaller particles of slag enter the water seal chamber. Under the original design, the ash and slag entering the water seal chamber are discharged to the outside of the water seal chamber through a large overflow. However, in order to improve the economic efficiency of the equipment and reduce wastewater discharge, the power plant has artificially reduced the water supply to the water seal, which causes ash and slag to accumulate in the water seal chamber. When the accumulation reaches a certain amount, it causes uneven temperature of the water seal chamber shell, resulting in deformation and cracking of the slag well water seal shell, which damages the water seal seal performance, reduces the operating capacity, and causes NOx exceedances. In order to ensure that the overflow water enters the furnace, the slag well water seal is designed with the outer side 50mm larger than the inner side, making it impossible for personnel to observe the internal water seal condition, resulting in the failure of the regulation capacity or deterioration. Therefore, this utility model proposes a water circulation structure for the slag removal system to solve the problems existing in the prior art. Utility Model Content

[0005] To address the aforementioned issues, this utility model proposes a water circulation structure for a slag removal system. This structure eliminates significant environmental hazards such as leaks in the furnace bottom water seal shell and inadequate sealing of the furnace bottom water seal. It also reduces industrial water consumption, saves on wastewater generation and treatment costs, ensures the safe and stable operation of the unit, and fulfills the fundamental requirement of zero discharge from the slag and water system.

[0006] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a water circulation structure for a slag removal system, including a boiler chamber, a slag remover, a slag water tank, a thickener, and a clear water tank. The slag remover is located below the boiler chamber, and the output end of the slag remover is connected to the slag water tank. The output end of the slag water tank is connected to the thickener, and the clear water discharge end of the thickener is connected to the clear water tank.

[0007] Water seals are provided on both sides of the boiler chamber. An inlet pipeline is connected to the bottom of the clear water tank. A branch pipeline is provided on the inlet pipeline. The output end of the inlet pipeline is connected to the water seal on one side, and the output end of the branch pipeline is connected to the water seal on the other side.

[0008] A further improvement is that: the bottom of the clear water tank is connected to a water outlet pipeline, and there are at least two sets of water outlet pipelines, the output end of which is connected to an inlet pipeline.

[0009] A further improvement is that a first valve is provided on both sets of water outlet pipelines, and a second valve is provided on the water inlet pipeline.

[0010] A further improvement is that a water supply pipe is also connected to the water seal, the water supply pipe is connected to industrial water, and the industrial water is also connected to the slag removal machine through a pipeline.

[0011] A further improvement is that the output end of the slag remover is equipped with a drain pipe, and the output end of the drain pipe is connected to a drainage ditch. The drainage ditch is connected to the slag water tank, and the output end of the slag water tank is connected to the thickener via a slag water pipe.

[0012] A further improvement is that a clean water pipe is connected to the top of one side of the concentrator, and the output end of the clean water pipe is connected to a clean water tank.

[0013] A further improvement is that the mud output end of the thickener is connected to the mud tank, and a circulation pipe is connected between the mud tank and the slag remover.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model incorporates the furnace bottom water seal system into the slag removal system water circulation. It uses an inlet pipeline to connect the clear water tank and the water seal area, controls the water inflow and pressure into the water seal, and introduces slag water into the water seal. The ash accumulated in the water seal is washed away with the slag water, and there is no sedimentation. This avoids defects such as shell deformation and cracking caused by uneven cooling. It not only eliminates difficult problems on site, but also improves the sealing performance of the unit and reduces environmental problems caused by excessive oxygen content due to air leakage.

[0016] 2. This utility model eliminates important environmental hazards such as leakage of the furnace bottom water seal and poor sealing of the furnace bottom water seal, reduces industrial water consumption, saves wastewater generation and treatment costs, ensures safe and stable operation of the unit, and fulfills the fundamental requirement of zero discharge of slag and water system. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention;

[0018] Figure 2 This is a schematic diagram of existing technology.

[0019] The components are: 1. Boiler chamber; 2. Slag remover; 3. Slag water tank; 4. Thickener; 5. Clear water tank; 6. Water seal; 7. Inlet pipeline; 8. Branch pipeline; 9. Outlet pipeline; 10. First valve; 11. Second valve; 12. Water supply pipe; 13. Industrial water; 14. Drainage pipe; 15. Drainage ditch; 16. Slag water pipe; 17. Clear water pipe; 18. Mud tank; 19. Circulation pipe. Detailed Implementation

[0020] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model. Example 1

[0021] according to Figure 1 As shown, this embodiment proposes a water circulation structure for a slag removal system, including a boiler chamber 1, a slag remover 2, a slag water tank 3, a thickener 4, and a clear water tank 5. The slag remover 2 is located below the boiler chamber 1, and the output end of the slag remover 2 is connected to the slag water tank 3. The output end of the slag water tank 3 is connected to the thickener 4, and the clear water discharge end of the thickener 4 is connected to the clear water tank 5.

[0022] Water seals 6 are provided on both sides of the boiler chamber 1. An inlet pipe 7 is connected to the bottom of the clear water tank 5. A branch pipe 8 is provided on the inlet pipe 7. The output end of the inlet pipe 7 is connected to the water seal 6 on one side, and the output end of the branch pipe 8 is connected to the water seal 6 on the other side. In use, the bottom water seal system is integrated into the slag removal system water circulation. The inlet pipe 7 connects the clear water tank 5 and the water seal 6 area, and the water inflow and pressure into the water seal 6 are controlled to introduce slag water into the water seal 6. The ash accumulated in the water seal 6 is flushed away with the slag water, and there is no sedimentation. This avoids defects such as shell deformation and cracking caused by uneven cooling. It not only eliminates difficult problems on site, but also improves the sealing performance of the unit and reduces environmental problems caused by excessive oxygen content due to air leakage.

[0023] The bottom of the clear water tank 5 is connected to an outlet pipe 9, and there are two sets of outlet pipes 9. The output end of the outlet pipe 9 is connected to the inlet pipe 7. Each set of outlet pipes 9 is equipped with a first valve 10, and the inlet pipe 7 is equipped with a second valve 11. The two sets of outlet pipes 9, together with the first valves 10, facilitate simultaneous opening and closing, and also allow one set to be used while the other is kept as a backup, thus improving reliability. The second valve 11 can close or open the inlet pipe 7.

[0024] A water supply pipe 12 is also connected to the water seal 6. The water supply pipe 12 is connected to industrial water 13, and the industrial water 13 is also connected to the slag remover 2 through a pipeline. In use, the industrial water 13 is connected to the water seal 6 through the water supply pipe 12 to provide industrial water to the water seal 6.

[0025] The slag remover 2 is equipped with a drain pipe 14 at its output end, and the output end of the drain pipe 14 is connected to a drain ditch 15. The drain ditch 15 is connected to the slag water tank 3, and the output end of the slag water tank 3 is connected to the thickener 4 via a slag water pipe 16. In use, the liquid in the slag remover 2 flows through the drain pipe 14 into the drain ditch 15, then through the drain ditch 15 into the slag water tank 3, and finally overflows from the slag water tank 3 into the slag water pipe 16 before being discharged into the thickener 4 for concentration.

[0026] A clear water pipe 17 is connected to the upper side of one side of the thickener 4, and the output end of the clear water pipe 17 is connected to the clear water tank 5. The sludge output end of the thickener 4 is connected to the sludge tank 18, and a circulation pipe 19 is connected between the sludge tank 18 and the slag remover 2. In use, the thickener 4 thickens the sludge water input from the sludge water tank 3, the clear water is discharged into the clear water pipe 17 for recycling, and the sludge is discharged into the sludge tank 18. Example 2

[0027] according to Figure 1 As shown, this embodiment proposes a water circulation structure for a slag removal system, including a boiler chamber 1, a slag remover 2, a slag water tank 3, a thickener 4, and a clear water tank 5. The slag remover 2 is located below the boiler chamber 1, and the output end of the slag remover 2 is connected to the slag water tank 3. The output end of the slag water tank 3 is connected to the thickener 4, and the clear water discharge end of the thickener 4 is connected to the clear water tank 5.

[0028] Water seals 6 are provided on both sides of the boiler chamber 1. An inlet pipe 7 is connected to the bottom of the clear water tank 5. A branch pipe 8 is provided on the inlet pipe 7. The output end of the inlet pipe 7 is connected to the water seal 6 on one side, and the output end of the branch pipe 8 is connected to the water seal 6 on the other side. In use, the bottom water seal system is integrated into the slag removal system water circulation. The inlet pipe 7 connects the clear water tank 5 and the water seal 6 area, and the water inflow and pressure into the water seal 6 are controlled to introduce slag water into the water seal 6. The ash accumulated in the water seal 6 is flushed away with the slag water, and there is no sedimentation. This avoids defects such as shell deformation and cracking caused by uneven cooling. It not only eliminates difficult problems on site, but also improves the sealing performance of the unit and reduces environmental problems caused by excessive oxygen content due to air leakage.

[0029] According to the flow direction of the medium: Industrial water 13 → Water seal 6 → Slag remover 2 → Slag water pool 3 → Thickener 4 → Clear water pool 5 → Water seal 6.

[0030] Adjust the motor frequencies of the slag water pump in slag water tank 3, the clear water pump in clear water tank 5, and the high-efficiency thickener drain pump in thickener 4. Reasonably control the flow rate to ensure the water volume and pressure in the furnace bottom water seal 6 and the water level inside the slag remover 2. Increase the liquid level in thickener 4 because the temperature of the slag water entering slag remover 2 and furnace bottom water seal 6 is higher than the original industrial water. To prevent the water temperature inside slag remover 2 from becoming too high, allow a large amount of wastewater to remain inside thickener 4 to cool down.

[0031] With this structure, the water source inside the furnace bottom water seal 6 initially uses industrial water, and is subsequently supplemented by slag water, saving industrial water costs every year.

[0032] The main function of the bottom water seal 6 is to ensure free expansion in the slag well area during boiler thermal expansion, meet system sealing requirements, and maintain negative pressure in the furnace. Therefore, the bottom water seal 6 needs to operate with overflow during operation. Currently, the steel used for the bottom water seal 6 in power plants is low-carbon steel, and to avoid material corrosion, the salinity of the water is a key factor. Since the bottom water seal 6 lacks drainage facilities, and to ensure the water seal chamber remains unobstructed, the overflow volume needs to be increased to remove the ash and slag entering the water seal 6. Based on the above reasons, and through on-site investigation, it was found that the water overflowing from the bottom water seal 6 flows into the slag remover 2 and can participate in the slag remover 2's water circulation system. Furthermore, the wastewater from the clear water tank 5, after testing, has a pH value between 6 and 7, making it usable within the bottom water seal 6.

[0033] This slag removal system's water circulation structure integrates the furnace bottom water seal system into the slag removal system's water circulation. An inlet pipeline 7 connects the clear water tank 5 and the water seal 6 area, controlling the inflow and pressure of water into the water seal 6. Slag-water is introduced into the water seal 6, where accumulated ash is flushed away, preventing sedimentation and avoiding defects such as shell deformation and cracking caused by uneven cooling. This not only eliminates on-site problems but also improves the unit's sealing performance, reducing environmental issues caused by excessive oxygen content due to air leakage. Simultaneously, it eliminates significant environmental hazards such as furnace bottom water seal leakage and inadequate sealing, reducing industrial water consumption, saving wastewater generation and treatment costs, ensuring the safe and stable operation of the unit, and fulfilling the fundamental requirement of zero discharge from the slag-water system.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A water circulation structure for a slag removal system, comprising a boiler chamber (1), a slag remover (2), a slag water tank (3), a thickener (4), and a clear water tank (5), characterized in that: The slag remover (2) is located below the boiler chamber (1), and the output end of the slag remover (2) is connected to the slag water tank (3). The output end of the slag water tank (3) is connected to the thickener (4), and the clean water discharge end of the thickener (4) is connected to the clean water tank (5). Water seals (6) are provided on both sides of the boiler chamber (1). An inlet pipe (7) is connected to the bottom of the clear water tank (5). A branch pipe (8) is provided on the inlet pipe (7). The output end of the inlet pipe (7) is connected to the water seal (6) on one side, and the output end of the branch pipe (8) is connected to the water seal (6) on the other side.

2. The water circulation structure of the slag removal system according to claim 1, characterized in that: The bottom of the clear water tank (5) is connected to a water outlet pipe (9), and there are at least two sets of water outlet pipes (9). The output end of the water outlet pipe (9) is connected to the inlet pipe (7).

3. The water circulation structure of a slag removal system according to claim 2, characterized in that: Both sets of water outlet pipelines (9) are equipped with a first valve (10), and the inlet pipeline (7) is equipped with a second valve (11).

4. The water circulation structure of a slag removal system according to claim 1, characterized in that: The water seal (6) is also connected to a water supply pipe (12), which is connected to industrial water (13), and the industrial water (13) is also connected to the slag remover (2) through a pipeline.

5. The water circulation structure of a slag removal system according to claim 1, characterized in that: The output end of the slag remover (2) is provided with a drain pipe (14), and the output end of the drain pipe (14) is connected to a drain ditch (15). The drain ditch (15) is connected to the slag water tank (3). The output end of the slag water tank (3) is connected to the thickener (4) by a slag water pipe (16).

6. The water circulation structure of a slag removal system according to claim 1, characterized in that: A water pipe (17) is connected above one side of the concentrator (4), and the output end of the water pipe (17) is connected to the water tank (5).

7. The water circulation structure of a slag removal system according to claim 6, characterized in that: The mud output end of the thickener (4) is connected to the mud tank (18), and a circulation pipe (19) is connected between the mud tank (18) and the slag remover (2).

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