Flushing water optimization and transformation device for slag salvaging machine matched with gasification device

Abstract

The invention provides a gasification device matched submerged chain conveyor flushing water optimization and transformation device, and belongs to the technical field of chemical gasification device water resource utilization, water saving and environmental protection, and a submerged chain conveyor system comprises a slag pool, a scraper conveyor and a vibrating screen; the flushing water optimization transformation device comprises a grey water recovery unit, a flushing water supply unit and a cooling filter tank. The cooling filter tank is communicated with the grey water recovery unit and the flushing water supply unit respectively to form a circulating path of grey water recovery-treatment-reutilization, and fresh water is replaced by grey water, so that the use of fresh water is reduced, wastewater discharge is reduced, the utilization rate of water resources is greatly improved, and the green production level of enterprises is improved. A water replenishing guarantee unit is arranged in the cooling filter tank, and sufficient supply of flushing water is guaranteed through the water replenishing guarantee unit.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of water resource utilization and water-saving environmental protection technology of chemical gasification device, and particularly relates to a slag extractor flushing water optimization and reconstruction device matched with a gasification device. BACKGROUND

[0002] In the chemical gasification industry, a large amount of high-temperature molten slag (temperature up to 1200-1500℃) is generated during the operation of a gasification furnace using coal or biomass as raw material, and the slag needs to be processed through a slag extractor system (slag pool, scraper conveyor, vibrating screen) for "cooling-transportation-separation".

[0003] In the prior art, fresh water is generally used as the flushing medium for the slag extractor. The vibrating screen needs to be flushed with high-pressure water to prevent slag particles from blocking the screen, and the scraper conveyor needs to be continuously flushed to prevent slag from adhering. Taking an enterprise with two HT-CTH gasification furnaces from Aerospace Maiwei as an example, the flushing water consumption of a single slag extractor reaches 6t / h, and according to the annual operation of 8000 hours, two sets of equipment consume 96000t of fresh water per year. At the same time, the water after flushing is directly discharged, and recycling is not realized, which not only exacerbates the shortage of water resources, but also increases the load of wastewater treatment. SUMMARY

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present application is to provide a slag extractor flushing water optimization and reconstruction device matched with a gasification device, so as to at least partially solve the problems raised in the background art.

[0005] The technical scheme adopted by the present application is as follows: a slag extractor flushing water optimization and reconstruction device matched with a gasification device is provided, which is applied to a slag extractor system of a chemical gasification device. The slag extractor system includes a slag pool, a scraper conveyor and a vibrating screen. The flushing water optimization and reconstruction device includes a grey water recovery unit, a flushing water supply unit and a cooling and filtering pool. The cooling and filtering pool is in communication with the grey water recovery unit and the flushing water supply unit, forming a "grey water recovery-treatment-reuse" circulation path. The grey water recovery unit includes a grey water pipeline I and a grey water pipeline II. The cooling and filtering pool is in communication with the slag pool and the vibrating screen through the grey water pipeline I and the grey water pipeline II. The flushing water supply unit flushes the vibrating screen and the scraper of the scraper conveyor through a flushing water pipeline I and a flushing water pipeline II, respectively. The cooling and filtering pool is provided with a water supplement guarantee unit to ensure sufficient supply of flushing water.

[0006] Further, the device further includes a slag discharge hopper and a stirring paddle. One end of the slag discharge hopper is in sealed communication with a slag discharge port of the chemical gasification device, and the other end extends above the slag discharge pool. The stirring paddle is inserted into the slag pool and arranged in the area between the filter plate and the scraper conveyor in the slag pool, and the stirring paddle is driven to rotate by the driving motor to stir the mixture of slag and water in the slag pool to prevent the slag from depositing.

[0007] Further, the filter plate is arranged on the inner wall of one side of the slag pool, the filter plate is made of 304 stainless steel, the thickness is 5-8mm, the inclination angle is 15-20°, and the filter holes with a diameter of 1-3mm are uniformly arranged on the plate body, and the opening rate is 30-40%, which ensures the filtering efficiency while reducing the water flow resistance; The water outlet end of the filter plate is provided with a water collecting tank, the water collecting tank is welded and sealed with the filter plate, and the outlet of the water collecting tank is connected with the grey water pipeline I through a flange, and the grey water filtered by the slag pool is transported to the cooling and filtering pool through the grey water pipeline I.

[0008] Further, the blowdown valve is installed on the side close to the drainage end of the vibrating screen of the grey water pipeline II, which is used to discharge a small amount of slag particles deposited in the pipeline to ensure the smoothness of the pipeline.

[0009] Further, the flushing water supply unit further comprises a flow control valve, which is installed at the water outlet end of the cooling and filtering pool and is used to adjust the output flow of the flushing water; One end of the flushing water pipeline I is in communication with the output end of the flow control valve, and the other end extends below the screen mesh of the vibrating screen, which is used to high-pressure flush the screen mesh of the vibrating screen to prevent the screen holes from being blocked; One end of the flushing water pipeline II is in communication with the output end of the flow control valve, and the other end extends above the scraper of the scraper conveyor, which is used to high-pressure flush the surface of the scraper of the scraper conveyor to remove the attached slag, and part of the water flows back to the slag pool after flushing, and part of the water flows into the vibrating screen.

[0010] Further, the cooling and filtering pool comprises a pool body, a cooling assembly and a filtering assembly; The pool body is made of reinforced concrete and coated with a corrosion-resistant coating on the inner wall, and is divided into a water inlet area, a treatment area and a water outlet area, a guide plate is arranged between the water inlet area and the treatment area, and a water baffle is arranged between the treatment area and the water outlet area to realize the partitioned flow of grey water; The cooling assembly is a serpentine cooling pipe installed in the treatment area, the water inlet end of which is in communication with an external circulating cooling water system, and the water outlet end is in communication with a circulating cooling water recovery pipeline; The filter assembly comprises a coarse filter layer, a fine filter layer and an adsorption layer arranged in sequence, the coarse filter layer is a 50-80 mesh stainless steel filter screen for retaining large particle impurities, the fine filter layer is a 100-150 mesh polypropylene filter membrane for filtering small suspended solids, and the adsorption layer is activated carbon particles with a particle size of 2-3 mm and a laying thickness of 80-120 mm for adjusting the pH value of the grey water to 7.0-8.5, and the filter assembly is of a detachable structure.

[0011] Further, the water replenishment guarantee unit comprises a water level detector and a fresh water standby valve; The water level detector is installed on the inner wall of one side of the water outlet area and is used for monitoring the water level in the pool in real time, and the fresh water standby valve is communicated with an external fresh water source, and when the water level detection component detects that the water level is lower than a preset threshold, the fresh water replenishment component is automatically opened to supplement fresh water to the cooling filter pool, and sufficient flushing water supply is ensured.

[0012] Beneficial effects: The cooling filter pool is connected with the grey water recovery unit and the flushing water supply unit through a pipeline system, so that a complete "grey water recovery-treatment-reuse" closed circulation system is constructed, fresh water is replaced by grey water, the use of fresh water is reduced, the wastewater discharge is reduced, the water resource utilization rate is greatly improved, and the green production level of enterprises is improved.

[0013] And through the water replenishment guarantee unit arranged in the cooling filter pool, the system operation can be monitored in real time and the water replenishment amount can be automatically adjusted, the water amount of the entire flushing water system is ensured to be sufficient through accurate control, and the equipment operation problem caused by insufficient water amount is completely avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 A slagging machine flushing water optimization and reconstruction device for a gasification device is provided for the embodiments of the present application; Fig. 2 A slagging machine flushing water optimization and reconstruction device slag material moving direction schematic view is provided for the embodiments of the present application; Fig. 3 A slagging machine flushing water optimization and reconstruction device water flow moving direction schematic view is provided for the embodiments of the present application.

[0015] 1, slag pool; 2, scraper conveyor; 3, vibrating screen; 4, stirring paddle; 5, slag discharge hopper; 6, filter plate; 7, cooling filter pool; 8, grey water pipeline I; 9, grey water pipeline II, 10, flow control valve; 11, flushing water pipeline I; 12, flushing water pipeline II.

[0016] The accompanying drawings are used to provide further understanding of the embodiments, and constitute a part of the specification, which are used to explain the embodiments together with the embodiments, and do not constitute a limitation on the embodiments. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments will be clearly and completely described in the embodiments of the application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope.

[0018] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments.

[0019] As shown in Figs. 1-3 In some embodiments, a slagging machine flushing water optimization retrofit device for a gasification device is applied to a slagging machine system of a chemical gasification device, and aims to solve the problem of water resource waste of a traditional flushing water system.

[0020] Specifically, the slagging machine system includes a slag pool 1, a scraper conveyor 2 and a vibrating screen 3. The slag pool 1 is used for temporarily storing and collecting gasification slag, and cooling the high-temperature slag, and the scraper conveyor 2 is used for conveying the slag in the slag pool to the vibrating screen 3, and the vibrating screen 3 is used for finally separating the slag, so that the solid slag is dewatered, facilitating subsequent transportation and processing.

[0021] In the optimization retrofit device, a grey water recovery unit, a flushing water supply unit and a cooling filter pool 7 are additionally provided, and through the organic cooperation of the three modules, efficient recycling of the flushing water is realized. Specifically, the cooling filter pool 7 is used as the core processing unit of the entire system, and is connected with the grey water recovery unit and the flushing water supply unit through a pipeline system, so as to build a complete "grey water recovery-treatment-reuse" closed circulation system. By using grey water instead of fresh water, the use of fresh water is reduced, the discharge of waste water is reduced, the water resource utilization rate is greatly improved, and the green production level of the enterprise is improved.

[0022] The grey water recovery unit comprises a grey water pipeline I 8 and a grey water pipeline II 9, the cooling filter tank 7 is connected with the slag tank 1 through the grey water pipeline I 8 for recovering the grey water in the slag tank, and is connected with the vibrating screen 3 through the grey water pipeline II 9 for collecting the grey water generated by the vibrating screen, and the double-pipeline design realizes the comprehensive and efficient recovery of the grey water in the system.

[0023] The flushing water supply unit comprises a flushing water pipeline I 11 and a flushing water pipeline II 12, the flushing water pipeline I 11 is used for supplying high-pressure flushing water to the vibrating screen 3 to ensure the cleaning effect of the screen, and the flushing water pipeline II 12 is used for supplying high-pressure flushing water to the scraper of the scraper conveyor 2 to clean the scraper.

[0024] In particular, the cooling filter tank 7 is further provided with a water supplement guarantee unit, which can monitor the system operation in real time and automatically adjust the water supplement amount, accurately controls the water amount of the entire flushing water system, and completely avoids the equipment operation problems caused by insufficient water amount.

[0025] The embodiment of the application is based on two gasification furnaces and two sets of slag conveyors.

[0026] In the embodiment, 96000t of fresh water can be saved per year by using low-pressure grey water to replace fresh water and adopting the filtering recovery technology, the water resource utilization rate is increased by more than 60%, the production cost is significantly reduced, and the economic benefit of the enterprise is improved. The specific working process of the embodiment is as follows: The slag generated by the gasification furnace is discharged into the slag tank 1, the scraper conveyor 2 operates to convey the mixed slag in the slag tank 1 to the vibrating screen 3, the vibrating screen 3 separates the dry slag from the water, the dry slag is discharged from the slag discharge end, and the water (grey water) flows into the cooling filter tank 7 through the grey water pipeline II 9; the water in the slag tank 1 is filtered and then flows into the cooling filter tank 7 through the grey water pipeline I 8; the cooling filter tank 7 cools and purifies the grey water, and the treated grey water is stored in the tank body; the treated grey water is distributed to the flushing water pipeline I 11 and the flushing water pipeline II 12 to flush the vibrating screen 3 and the scraper of the scraper conveyor 2 respectively; part of the flushing water flows back to the slag tank 1, and part of the flushing water flows into the vibrating screen 3 to enter the next cycle.

[0027] Further, in some embodiments, the optimization and reconstruction device further comprises a slag discharge hopper 5 and a stirring paddle 4.

[0028] The blade part of the stirring paddle 4 adopts a spiral blade design, is fully immersed below the liquid surface of the slag pool 1 by 0.5-1 meters, and is arranged in the middle region between the filter plate 6 and the scraper conveyor 2 in the slag pool 1. The stirring paddle 4 is connected with the driving motor through a shaft coupling, and can be rotated clockwise or counterclockwise under the driving of the motor, so that the mixed slurry formed by the slag and water in the slag pool 1 is continuously stirred in multiple directions and multiple angles. This dynamic stirring mode can effectively prevent the solid slag from depositing and caking at the bottom of the pool, and in turn prevent the slag from accumulating to cause the scraper conveyor 2 to be blocked.

[0029] Further, in some embodiments, the filter plate 6 is arranged in an inclined manner, and is fixed on the inner wall of one side of the slag pool 1 at an inclination angle of 15-20°. The filter plate is made of high-quality 304 stainless steel, has excellent corrosion resistance and mechanical strength, and the thickness of the plate body is controlled within the range of 5-8 mm, which ensures the structural strength and economy. On the surface of the filter plate 6, circular filter holes with a diameter of 1-3 mm are uniformly arranged. These filter holes are arranged in a staggered manner, and the opening rate is strictly controlled within the range of 30-40%. This design can effectively intercept the solid particles in the slag pool 1, and also ensure smooth water flow, achieving the best balance between filtration efficiency and water flow resistance.

[0030] In particular, a water collecting tank structure is arranged at the water outlet end of the filter plate 6. The water collecting tank is sealed and connected with the filter plate 6 by full welding process to ensure no leakage. The outlet end of the water collecting tank is reliably connected with the ash water pipeline I 8 through a standard flange, thereby forming a complete ash water collection and conveying system. The ash water filtered by the filter plate 6 is first collected in the water collecting tank, and then conveyed to the downstream cooling filter pool 7 through the ash water pipeline I 8, thereby completing the collection, filtration and conveying process of the ash water.

[0031] Further, in some embodiments, a blowdown valve device is specially installed on one side of the ash water pipeline II 9 close to the drainage end of the vibrating screen 3. The main function of the blowdown valve is to periodically discharge a small amount of slag particles and impurities deposited in the pipeline. By arranging the blowdown valve, the phenomenon of pipeline blockage can be effectively prevented, and the long-term stable operation of the flushing water system can be ensured.

[0032] Further, in some embodiments, the flushing water supply unit further comprises a flow control valve 10. The flow control valve 10 is installed at the water outlet end of the cooling filter pool 7, and realizes intelligent control of the flushing water flow by electric adjustment. The flushing water output flow can be adjusted in real time according to the actual working condition requirements, so as to ensure the optimization of flushing effect and water resource utilization.

[0033] One end of the flushing water pipeline 11 is in communication with the output end of the flow control valve 10, and the other end extends to below the screen of the vibrating screen 3. The pipeline end is provided with a fan-shaped nozzle, which can form a wide-angle high-pressure water curtain to perform all-around and dead-angle-free strong flushing on the screen of the vibrating screen 3, effectively prevent slag particles from blocking the screen holes, and ensure the continuous and stable screening efficiency.

[0034] One end of the flushing water pipeline 11 is in communication with the output end of the flow control valve 10, and the other end extends to below the screen of the vibrating screen 3. The pipeline end is provided with a fan-shaped nozzle, which can form a wide-angle high-pressure water curtain to perform all-around and dead-angle-free strong flushing on the screen of the vibrating screen 3, effectively prevent slag particles from blocking the screen holes, and ensure the continuous and stable screening efficiency.

[0035] Further, in some embodiments, the cooling and filtering tank 7 comprises a tank body, a cooling assembly and a filtering assembly.

[0036] The tank body is integrally casted by reinforced concrete, and the inner wall is uniformly coated with a 2-3mm-thick epoxy coal pitch corrosion-resistant coating, which has excellent corrosion resistance. The tank body is divided into a water inlet area, a treatment area and a water outlet area. A guide plate is arranged between the water inlet area and the treatment area, and a water baffle is arranged between the treatment area and the water outlet area, so that the grey water can flow in an orderly manner according to the designed path, and can be effectively filtered.

[0037] The cooling assembly is a serpentine cooling pipe installed in the treatment area. The water inlet end of the cooling assembly is in communication with an external circulating cooling water system, and the water outlet end is in communication with a circulating cooling water recovery pipeline. The grey water with a relatively high temperature is treated by the cooling assembly to form grey water with a relatively low temperature.

[0038] To ensure the filtering effect, the filtering assembly comprises a coarse filter layer, a fine filter layer and an adsorption layer arranged in sequence. The coarse filter layer is a 50-80 mesh stainless steel filter screen for retaining large-particle impurities. The fine filter layer is a 100-150 mesh polypropylene filter membrane for filtering small suspended solids. The adsorption layer is activated carbon particles with a particle size of 2-3mm and a laying thickness of 80-120mm, which is used to adjust the pH value of the grey water to 7.0-8.5. The entire filtering system adopts a drawer-type modular design, and each filtering unit can be independently disassembled and replaced for easy maintenance.

[0039] Further, in some embodiments, the water replenishment guarantee unit comprises a water level detector and a fresh water standby valve. The water level detector is installed on the inner wall of one side of the water outlet area and can collect and transmit the water level data in the tank to the control system in real time. The fresh water standby valve is preferably a DN50 fresh water standby valve, which is in communication with the fresh water source in the factory area through a flange.

[0040] When the water level detector detects that the water level is lower than the preset threshold, the fresh water replenishment component is automatically opened to supplement fresh water to the cooling filter tank 7, thereby ensuring that the slag dredger flushing water system always maintains a stable water level required by the design, and providing reliable water source guarantee for the safe operation of the gasification device. Through the cooperation of the water level detector and the fresh water standby valve, the water level of the cooling filter tank is monitored in real time and the water is automatically replenished, avoiding the interruption of flushing due to insufficient grey water supply.

[0041] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0042] The above describes the embodiments, which is not limited, and the drawings shown is only one of the embodiments, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired, without departing from the creative purpose, without creative design, similar structure and embodiments of the technical solution can be designed, which shall belong to the protection scope.

Claims

1. A gasification device is matched with the flushing water optimization device of the slag machine, is applied to the slag machine system of the gasification device of the chemical industry, the slag machine system includes the slag pool (1), the scraper conveyor (2) and the vibrating screen (3), it is characterized in that, The flushing water optimization transformation device comprises a grey water recovery unit, a flushing water supply unit and a cooling filter tank (7) in communication with the grey water recovery unit and the flushing water supply unit respectively, forming a "grey water recovery-treatment-reuse" circulation path; The grey water recovery unit comprises a grey water pipeline I (8) and a grey water pipeline II (9), and the cooling filter tank (7) is in communication with the slag pool (1) and the vibrating screen (3) through the grey water pipeline I (8) and the grey water pipeline II (9) respectively; The flushing water supply unit flushes the vibrating screen (3) and the blade of the scraper conveyor (2) through a flushing water pipeline I (11) and a flushing water pipeline II (12) respectively; The cooling filter tank (7) is provided with a water supplement guarantee unit.

2. The gasification plant equipped with a slag conveyor and a washing water optimization retrofit device according to claim 1, characterized in that, Further comprising a slag discharge hopper (5) and a stirring paddle (4), one end of the slag discharge hopper (5) is in sealed communication with a slag discharge port of the chemical gasification device, and the other end extends above the slag pool (1); The stirring paddle (4) is inserted into the slag pool (1) and arranged in a region between the filter plate (6) and the scraper conveyor (2) in the slag pool (1), and the stirring paddle (4) is driven to rotate by a driving motor to stir the mixture of slag and water in the slag pool (1) and prevent the slag from depositing.

3. The gasification plant equipped with a slag conveyor and a washing water optimization retrofit device according to claim 2, characterized in that, The filter plate (6) is obliquely arranged on the inner wall of one side of the slag pool (1), is made of 304 stainless steel, has a thickness of 5-8 mm, an oblique angle of 15-20°, and a plurality of filter holes of 1-3 mm in diameter uniformly arranged on the plate body, and has an opening rate of 30-40%, so as to ensure the filtering efficiency while reducing the water flow resistance; The water outlet end of the filter plate (6) is provided with a water collecting tank which is welded and sealed with the filter plate (6), and the outlet of the water collecting tank is connected with the grey water pipeline I (8) through a flange, so that the filtered grey water in the slag pool (1) is conveyed to the cooling filter tank (7) through the grey water pipeline I (8).

4. The gasification plant equipped with a slag conveyor and a flushing water optimization retrofit device according to claim 2, characterized in that, A blowdown valve is installed on one side of the grey water pipeline II (9) close to the water discharge end of the vibrating screen (3) to discharge a small amount of slag particles deposited in the pipeline and ensure the smoothness of the pipeline.

5. The gasification plant equipped with a slag conveyor and a washing water optimization retrofit device according to claim 2, characterized in that, The flushing water supply unit further comprises a flow control valve (10) installed at the water outlet end of the cooling filter tank (7) for adjusting the output flow of the flushing water; One end of the flushing water pipeline I (11) is in communication with the output end of the flow control valve (10), and the other end extends below the screen mesh of the vibrating screen (3) for high-pressure flushing of the screen mesh of the vibrating screen (3) to prevent the screen holes from being blocked; One end of the flushing water pipeline II (12) is in communication with the output end of the flow control valve (10), and the other end extends above the blade of the scraper conveyor (2) for high-pressure flushing of the surface of the blade of the scraper conveyor (2) to remove the attached slag, and part of the water flow after the flushing flows back to the slag pool (1) and part of the water flow flows into the vibrating screen (3).

6. The gasification plant equipped drag-and-drop machine flush water optimization retrofit device according to claim 1, characterized in that, The cooling filter tank (7) comprises a tank body, a cooling assembly and a filtering assembly. The pool body is made of reinforced concrete material, the inner wall is coated with anticorrosive coating, is divided into water inlet area, treatment area and water outlet area, the water inlet area and the treatment area are provided with guide plates, the treatment area and the water outlet area are provided with water baffle, the grey water is realized in the partition flow; The cooling assembly is a serpentine cooling pipe, installed in the treatment area, the water inlet end is communicated with the external circulating cooling water system, the water outlet end is communicated with the circulating cooling water recovery pipeline; The filter assembly includes coarse filter layer, fine filter layer and adsorption layer arranged in sequence, the coarse filter layer is 50-80 mesh stainless steel filter screen, used for intercepting large particle impurities, the fine filter layer is 100-150 mesh polypropylene filter membrane, used for filtering small suspended solids, the adsorption layer is activated carbon particles with particle size of 2-3mm, laid with thickness of 80-120mm, used for adjusting the pH value of grey water to 7.0-8.5, the filter assembly is a detachable structure.

7. The gasification plant equipped drag-and-drop machine flush water optimization retrofit device according to claim 6, characterized in that, The water replenishment guarantee unit includes water level detector and fresh water standby valve; The water level detector is installed on the inner wall of one side of the water outlet area, used for real-time monitoring of the water level in the pool; the fresh water standby valve is communicated with the external fresh water source, when the water level detection component detects that the water level is lower than the preset threshold, the fresh water replenishment component is automatically opened, to supplement fresh water to the cooling filter pool (7), to ensure sufficient supply of flushing water.

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