Gasification black water self-cleaning type slag flushing channel

Abstract

The utility model provides a kind of gasification black water self-cleaning formula flushes slag groove, its technical scheme is: including slag pool, the side wall top of slag pool is equipped with overflow, overflow is connected with the inlet of flush water pump by pipeline, the outlet of flush water pump is provided main pipeline, main pipeline is laid along groove, the top of main pipeline is equipped with several washing mechanism, the outlet of groove is connected to slag pool, and the bottom of groove is laid with cast stone plate.The utility model has beneficial effects: (1) realize water resource recycling, reduce operating cost;(2) strengthen washing effect, reduce fine slag accumulation and blockage;(3) improve the wear resistance and self-cleaning ability of channel, prolong service life;(4) ensure system operation stability and maintenance convenience.

Description

Technical Field

[0001] This utility model belongs to the field of coal gasification product treatment technology, and in particular relates to a self-cleaning slag flushing ditch for gasification black water. Background Technology

[0002] In coal gasification processes (such as coal-water slurry gasification), the ash generated during the gasification reaction needs to be transported and treated via a water system: coarse ash is separated and dewatered by a ash remover, while fine ash circulates within the system with the black water (wastewater containing fine ash), and is finally discharged into the ash flushing ditch through the tower tank's drain valve, from where it is transported to the ash pond for further separation. The ash flushing ditch, as a crucial channel for transporting black water and fine ash, directly affects the continuous operation of the gasification system due to its unobstructed flow.

[0003] The existing slag flushing ditch structure has the following drawbacks in practical applications:

[0004] (1) The bottom of the slag flushing ditch is mostly designed with a flat plate or a simple slope, which is not smooth enough. Fine slag is easy to be deposited at the bottom of the ditch due to the slow flow rate. Some areas form dead corners for cleaning. After long-term accumulation, the cross-section of the ditch is reduced or even completely blocked. Due to the narrow space of the slag flushing ditch, manual cleaning requires entering the ditch, which is labor-intensive and time-consuming for each cleaning, seriously affecting the continuity of the system.

[0005] (2) The flushing water source relies mainly on fresh primary water and does not utilize recycled water resources such as overflow water from the slag pond, resulting in high operating costs.

[0006] (3) The bottom of the slag flushing ditch is often paved with ordinary steel plates or concrete. When faced with the long-term flushing of black water, it is easy to wear and form pits. Fine slag is retained and deposited in the pits, further reducing the self-cleaning ability of the ditch. This vicious cycle leads to an increase in the frequency of blockage.

[0007] Therefore, there is an urgent need to develop a slag flushing ditch structure with strong self-cleaning ability, high flushing efficiency, and water resource recycling. Summary of the Invention

[0008] To address the problems in the prior art, this utility model provides a self-cleaning slag flushing ditch for gasified black water. The technical solution is as follows: it includes a slag pool, an overflow port is provided on the top of the side wall of the slag pool, the overflow port is connected to the inlet of a flushing water pump through a pipe, a main pipe is provided at the outlet of the flushing water pump, the main pipe is laid along the ditch, a number of flushing mechanisms are provided on the top of the main pipe, the outlet of the ditch is connected to the slag pool, and the bottom of the ditch is covered with cast stone slabs.

[0009] In a preferred embodiment, the flushing mechanism includes a flushing branch pipe and a flushing nozzle. The flushing branch pipe has an n-shaped structure, with its inlet end perpendicular to the main pipe and its outlet end equipped with a flushing nozzle.

[0010] In a more preferred embodiment, the flushing branch pipe is further provided with a flushing hand valve.

[0011] In a more preferred embodiment, the flushing nozzle has a trumpet-shaped structure with a spray angle of 60° and a spray direction consistent with the flow direction of the black water.

[0012] In a preferred embodiment, the cast stone slab has a slope of 1%-3%, a surface roughness of less than Ra0.3μm, and a wavy surface structure, with the slope direction consistent with the flow direction of the black water.

[0013] In a preferred embodiment, the inlet pipe of the flushing water pump is equipped with an inlet manual valve, and the main pipe at its outlet is equipped with an outlet check valve and an outlet manual valve in sequence.

[0014] In a more preferred embodiment, the main pipeline is further provided with a primary water flushing mechanism, which is located downstream of the outlet hand valve along the water flow direction of the main pipeline.

[0015] In a more preferred embodiment, the primary water flushing mechanism includes a primary water branch pipe, a primary water check valve, and a primary water operator valve. The outlet end of the primary water branch pipe is connected to the main pipe, and the inlet end is connected to an external tap water pipe. The primary water check valve and the primary water operator valve are sequentially installed on the primary water branch pipe along the water flow direction.

[0016] In a preferred embodiment, the sidewalls of the trench are provided with several support plates, and the main pipeline is laid on the support plates.

[0017] The beneficial effects of this utility model are:

[0018] (1) The water from the overflow outlet of the slag pool is recycled to the main pipeline by the flushing water pump and used as the flushing water source for cleaning the slag flushing ditch. It does not need to rely on fresh primary water. It is only supplemented by the primary water flushing mechanism when the circulating water is insufficient. The water resource utilization rate is improved, the consumption of fresh water and the cost of sewage treatment are significantly reduced, and the defects of traditional slag flushing ditch relying on fresh water and high operating costs are solved.

[0019] (2) The flushing mechanism adopts an n-type flushing branch pipe and a trumpet-shaped nozzle, which can form a fan-shaped flushing area along the black water flow path, covering the entire cross section of the channel and reducing the flushing blind spot;

[0020] With the cast stone slabs providing a 1%-3% slope, gravity accelerates the flow of black water, reducing the retention time of fine debris at the bottom of the ditch. This dual effect significantly reduces the frequency of manual debris removal, solving the problems of fine debris accumulation, blockage, and difficulty in cleaning.

[0021] (3) The cast stone slabs laid at the bottom of the channel have excellent wear resistance, far superior to traditional steel plates or concrete. They can withstand the long-term scouring of black water containing slag, avoiding the deposition of fine slag due to pitting caused by wear. Their smooth surface reduces the attachment points of fine slag and lowers the risk of deposition. The wavy surface enhances the turbulence effect when black water flows. Combined with the design that the slope direction is consistent with the flow of black water, it further strengthens the ability to scour and peel off fine slag, achieves self-cleaning function, and extends the service life of the channel.

[0022] (4) The inlet hand valve, outlet check valve and other valves facilitate the separate control and maintenance of the flushing system. The outlet check valve can prevent black water from backflowing and contaminating the water pump. The primary water flushing mechanism serves as a backup and can be quickly switched when the circulating water system fails, ensuring that the flushing is uninterrupted and improving the system reliability. Attached Figure Description

[0023] Fig. 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Fig. 2 This is a schematic diagram of the structure of this utility model along the direction of the trench.

[0025] In the diagram: 1. Inlet manual valve; 2. Flushing water pump; 3. Outlet check valve; 4. Outlet manual valve; 5. Primary water check valve; 6. Primary water manual valve; 7. Main pipeline; 8. Trench; 9. Flushing manual valve; 10. Flushing nozzle; 11. Slag pool; 12. Support plate; 13. Cast stone slab; 14. Flushing branch pipe; 15. Primary water branch pipe. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Example

[0028] like Figs. 1-2 The diagram shows a self-cleaning slag flushing ditch for gasified black water, including a slag pool 11. The top of the side wall of the slag pool 11 is provided with an overflow port, which is connected to the inlet of a flushing water pump 2 through a pipe. The outlet of the flushing water pump 2 is provided with a main pipe 7, which is laid along the ditch 8. Several flushing mechanisms are provided on the top of the main pipe 7. The outlet of the ditch 8 is connected to the slag pool 11, and the bottom of the ditch 8 is covered with cast stone slabs 13.

[0029] After the black water containing fine slag produced by the gasification reaction enters the trench 8, it flows along the bottom of the trench 8 and is eventually discharged into the slag pool through the trench outlet. During the flow in the trench 8, the system simultaneously starts the self-cleaning flushing mechanism. Part of the supernatant is transported to the flushing water pump 2 through the overflow port at the top of the slag pool 11. After being pressurized by the flushing water pump 2, it enters the main pipeline 7. The flushing mechanism set on the main pipeline 7 flushes the fine slag in the trench 8. The flushing water pump 2 is a variable frequency water pump, which can stabilize the flushing water pressure according to actual needs, making it more flexible to use and saving electricity.

[0030] Furthermore, the flushing mechanism includes a flushing branch pipe 14 and a flushing nozzle 10. The flushing branch pipe 14 has an n-shaped structure, with its inlet end perpendicular to the main pipe 7 and its outlet end equipped with a flushing nozzle 10, to prevent a small amount of fine residue in the supernatant from clogging the flushing branch pipe 14 and the flushing nozzle.

[0031] Furthermore, the flushing branch pipe 14 is also equipped with a flushing hand valve 9, which is used to control the water outlet switch during maintenance.

[0032] Furthermore, the flushing nozzle 10 has a trumpet-shaped structure with a spray angle of 60° and a spray direction consistent with the flow direction of the black water, forming a fan-shaped flushing area along the water flow path. This works in conjunction with the flow of the black water itself to flush away the fine residue remaining at the bottom of the ditch, reducing the flushing blind spots.

[0033] Furthermore, the cast stone slab 13 has a slope of 1%-3%, a surface roughness of less than Ra0.3μm, and a wavy surface structure. The slope direction is consistent with the flow direction of the black water. This can accelerate the flow of black water by gravity and enhance the turbulence effect of the water flow through the wavy surface, reducing the retention of fine debris at the bottom of the ditch. At the same time, the extremely low surface roughness of the cast stone slab 13 reduces the attachment points of fine debris and further inhibits deposition.

[0034] Furthermore, the inlet pipe of the flushing water pump 2 is equipped with an inlet hand valve 1, and the main pipe 7 at its outlet is equipped with an outlet check valve 3 and an outlet hand valve 4 in sequence. The inlet hand valve 1 and the outlet hand valve 4 facilitate the separate control or maintenance of the flushing system, and the outlet check valve 3 on the main pipe 7 prevents black water from flowing back into the flushing water pump.

[0035] Furthermore, the main pipeline 7 is also equipped with a primary water flushing mechanism. The primary water flushing mechanism is located downstream of the outlet hand valve 4 along the water flow direction of the main pipeline. The primary water flushing mechanism serves as a backup and can be quickly switched when the circulating water is insufficient or the water pump fails, ensuring uninterrupted flushing and continuous operation of the system.

[0036] Furthermore, the primary water flushing mechanism includes a primary water branch pipe 15, a primary water check valve 5, and a primary water hand valve 6. The outlet end of the primary water branch pipe 15 is connected to the main pipe 7, and the inlet end is connected to an external tap water pipe. The primary water check valve 5 and the primary water hand valve 6 are sequentially installed on the primary water branch pipe 15 along the water flow direction. The primary water hand valve 6 facilitates the independent control or maintenance of the flushing system, and the primary water check valve 5 prevents black water from flowing back into the clean water source and causing pollution.

[0037] Furthermore, the sidewall of the trench 8 is provided with several support plates 12, and the main pipe 7 is laid on the support plates 12.

[0038] The operation of the aforementioned slag flushing ditch is as follows: A portion of the supernatant is collected at the overflow port at the top of the slag pool 11 sidewall and transported via pipeline to the inlet of the flushing water pump 2. After being pressurized by the flushing water pump 2, it enters the main pipeline 7 (the main pipeline is laid along the ditch and fixed by support plates on the sidewall of the ditch to ensure stable positioning). The flushing water in the main pipeline 7 is distributed to the flushing nozzles 10 through several flushing branch pipes. The nozzles spray water into the ditch to flush the bottom and sidewalls. If the circulating water is insufficient or the flushing effect needs to be enhanced, the primary water flushing mechanism can be activated, and external tap water can be supplied to the main pipeline through the primary water branch pipes to increase the flushing force. The flushed black water and fine slag mixture flow together into the slag pool. After sedimentation in the slag pool 11, the upper part, which is clear liquid, is transported back to the flushing water pump 2 through the overflow port, completing the cycle of black water transportation, self-cleaning flushing, and slag water recovery.

Claims

1. A self-cleaning slag flushing ditch for gasified black water, comprising a slag pool (11), characterized in that, The top of the side wall of the slag pool (11) is provided with an overflow port, which is connected to the inlet of the flushing water pump (2) through a pipe. The outlet of the flushing water pump (2) is provided with a main pipe (7), which is laid along the trench (8). Several flushing mechanisms are provided at the top of the main pipe (7). The outlet of the trench (8) is connected to the slag pool (11), and the bottom of the trench (8) is covered with cast stone slabs (13).

2. The self-cleaning slag flushing ditch for gasified black water according to claim 1, characterized in that, The flushing mechanism includes a flushing branch pipe (14) and a flushing nozzle (10). The flushing branch pipe (14) has an n-shaped structure, with its inlet end perpendicular to the main pipe (7) and its outlet end equipped with a flushing nozzle (10).

3. The self-cleaning slag flushing ditch for gasified black water according to claim 2, characterized in that, The flushing branch pipe (14) is also equipped with a flushing hand valve (9).

4. A self-cleaning slag flushing ditch for gasified black water according to claim 2, characterized in that, The flushing nozzle (10) has a trumpet-shaped structure with a spray angle of 60° and a spray direction consistent with the flow direction of black water.

5. A self-cleaning slag flushing ditch for gasified black water according to claim 1, characterized in that, The cast stone slab (13) has a slope of 1%-3%, a surface roughness of less than Ra0.3μm, and a wavy surface structure with the slope direction consistent with the flow direction of black water.

6. A self-cleaning slag flushing ditch for gasified black water according to claim 1, characterized in that, The flushing water pump (2) has an inlet hand valve (1) on the inlet end pipe and an outlet check valve (3) and an outlet hand valve (4) on the main pipe (7) at the outlet end.

7. A self-cleaning slag flushing ditch for gasified black water according to claim 6, characterized in that, The main pipeline (7) is also equipped with a primary water flushing mechanism, which is located downstream of the outlet hand valve (4) along the water flow direction of the main pipeline.

8. A self-cleaning slag flushing ditch for gasified black water according to claim 7, characterized in that, The primary water flushing mechanism includes a primary water branch pipe (15), a primary water check valve (5), and a primary water hand valve (6). The outlet end of the primary water branch pipe (15) is connected to the main pipe (7), and the inlet end is connected to an external tap water pipe. The primary water branch pipe (15) is provided with a primary water check valve (5) and a primary water hand valve (6) in sequence along the water flow direction.

9. A self-cleaning slag flushing ditch for gasified black water according to claim 1, characterized in that, The trench (8) has several support plates (12) on its sidewalls, and the main pipe (7) is laid on the support plates (12).

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