Device and method for separating residual carbon from coal gasification slag

Abstract

The present invention provides a device and method for sorting residual carbon in coal gasification slag. The device includes: a shell, provided with a accommodating chamber, and provided with a liquid inlet, a fine material outlet, and a tailings outlet connected to the accommodating chamber; a feed pipe, mounted in the accommodating chamber, on which a feed pump is installed; an overflow trough, sleeved with the shell at one end of the fine material outlet, provided with a discharge port; a tailings discharge pipe, connected to the tailings outlet, provided with a discharge valve; a water flow riser distribution plate, a first end connected to the inner wall of the shell, a second end connected to the end of the tailings discharge pipe inserted into the accommodating chamber, and covering the cross-section between the inner wall of the shell and the tailings discharge pipe, a plurality of through holes formed on the water flow riser distribution plate, a liquid inlet provided on the side of the water flow riser distribution plate facing the tailings outlet; a liquid inlet pipe, connected to the liquid inlet; and an ultrasonic generator, disposed in the accommodating chamber. The present invention enhances density differences with the help of the ultrasonic generator, thereby improving the sorting accuracy and separation efficiency of carbon ash in coal gasification slag.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive treatment of coal gasification slag, and in particular to a device and method for sorting residual carbon in coal gasification slag. Background Art

[0002] my country's energy mainly relies on coal. While coal provides sufficient electricity and chemical raw materials for my country's economic development, it also produces a large amount of ash. The residual carbon content in coal gasification slag is usually between 10-50%. The existing large-scale utilization of coal ash slag is mainly for the production of building materials such as cement, concrete, and bricks. However, these methods all require the residual carbon content in the ash to be no more than 10%. Due to the high residual carbon content, coal gasification slag cannot be directly used as a raw material for the production of these products. Moreover, the carbon in coal gasification slag, as a combustible material after high-temperature treatment, still has considerable utilization value. Therefore, it is very necessary to extract carbon from coal gasification slag and then separate it for utilization.

[0003] In the existing technology, there are two main methods for separating carbon and ash from coal gasification slag: flotation and gravity separation. The flotation method separates residual carbon and ash particles by strengthening the hydrophilicity and hydrophobicity of the particle surface. The improved flotation method has a good separation effect under laboratory conditions, but its reagent consumption is large and it is difficult to apply on a large scale. The gravity separation method uses the density difference between particles to complete the separation under the action of the gravity field. Usually, devices such as water medium cyclones or spiral separators are used. This type of device can complete carbon extraction under the condition of using water as the separation medium, but the single gravity field has a weak viscous resistance to particles of different coarseness and fineness, and it is difficult to produce a sufficient displacement difference between carbon and ash, resulting in a very poor separation effect. Summary of the Invention

[0004] In light of this, the present invention provides a device and method for separating residual carbon from coal gasification slag. Slurry is injected into the housing through an upper feed pipe, and water flows through a lower liquid inlet pipe and a rising water distribution plate into the housing. As the rising water interacts with the descending slurry, an ultrasonic generator within the housing emits ultrasonic waves, enhancing density differences and achieving efficient separation of carbon ash from coal gasification slag, thus overcoming the shortcomings of existing technologies.

[0005] The device for separating residual carbon from coal gasification slag provided by the present invention comprises:

[0006] A housing is provided with a receiving cavity, and the housing is provided with a liquid inlet, a concentrate outlet, and a tailings outlet communicated with the receiving cavity;

[0007] A feed pipe is installed in the accommodating cavity and a feed pump is installed on the feed pipe;

[0008] An overflow trough, wherein the housing is sleeved on one end of the concentrate outlet and the overflow trough is provided with a discharge port;

[0009] a tailings discharge pipe, the tailings discharge pipe being in communication with the tailings outlet and being provided with a discharge valve;

[0010] a water flow rising distribution plate, wherein a first end of the water flow rising distribution plate is connected to the inner wall of the shell, a second end of the water flow rising distribution plate is connected to one end of the tailings discharge pipe inserted into the accommodating cavity, and covers the cross section between the inner wall of the shell and the tailings discharge pipe, a plurality of through holes are formed on the water flow rising distribution plate, and the liquid inlet is formed on a side of the water flow rising distribution plate facing the tailings outlet;

[0011] a liquid inlet pipe, the liquid inlet pipe being connected to the liquid inlet;

[0012] An ultrasonic generator is arranged in the accommodating cavity.

[0013] Optionally, the device for sorting residual carbon in coal gasification slag further includes: a stirring component, and the stirring component is set up in the accommodating chamber.

[0014] Optionally, the stirring assembly includes: a motor, which is mounted in the accommodating cavity; a transmission shaft, which is drivingly connected to the motor; and a stirring blade, which is fixedly connected to the transmission shaft.

[0015] Optionally, the device for sorting residual carbon in coal gasification slag also includes: an interference component, which is connected to the inner wall of the accommodating cavity on the side of the water flow rising distribution plate facing away from the tail material outlet, and is used to prevent channel flow or vortex flow from occurring in the shell.

[0016] Optionally, the interference component includes: a plurality of interference columns, and the plurality of interference columns are connected to the inner wall of the accommodating cavity at intervals.

[0017] Optionally, the device for sorting residual carbon in coal gasification slag also includes: a density meter, which is arranged in the accommodating cavity; and a controller, wherein the input end of the controller is communicatively connected to the output end of the density meter, and the output end of the controller is communicatively connected to the control end of the discharge valve.

[0018] Optionally, the device for sorting residual carbon in coal gasification slag further comprises: a pressure gauge, which is disposed in the accommodating cavity, and the output end of the pressure gauge is communicatively connected to the input end of the controller.

[0019] Optionally, the device for sorting residual carbon in coal gasification slag further comprises: a fine material discharge pipe, wherein the fine material discharge pipe is connected to the outer wall of the shell and communicates with the discharge port.

[0020] The present invention further provides a method for separating carbon residue in coal gasification slag, which is based on the device for separating carbon residue in coal gasification slag described in any one of the above items, comprising the following steps:

[0021] Add water to the coal gasification slag to prepare a slurry of a set concentration;

[0022] The slurry is wet screened and classified, particles smaller than a set particle size are directly collected after filtration, and particles greater than or equal to the set particle size are screened into slurries of different particle sizes;

[0023] The ore pulps of different particle sizes are respectively injected into the shell of the device for separating the residual carbon in the coal gasification slag, and are separated respectively. The upper slag is discharged from the discharge port of the overflow trough, and the lower slag is discharged from the tailing discharge pipe.

[0024] The upper scum is filtered to obtain the concentrate, and the lower sediment is filtered to obtain the tailings.

[0025] Optionally, the filtrate after the upper scum and the lower sediment are filtered and recycled as circulating water.

[0026] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0027] According to the device and method for separating residual carbon from coal gasification slag of the present invention, slurry is injected into the shell through the upper feed pipe, and water flows into the shell through the lower liquid inlet pipe and the water flow rising distribution plate. While the rising water flow interacts with the descending slurry, the ultrasonic generator in the shell emits ultrasonic waves, which enhance the density difference with the help of ultrasonic waves, thereby improving the separation accuracy and separation efficiency of carbon ash in the coal gasification slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of an apparatus for separating residual carbon from coal gasification slag according to one embodiment of the present invention;

[0029] Figure 2 The present invention is a flowchart of a method for separating residual carbon from coal gasification slag according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1: Shell; 2: Feed pipe; 3: Overflow trough; 4: Tail material discharge pipe; 5: Water flow rising distribution plate; 6: Liquid inlet pipe; 7: Ultrasonic generator; 8: Accommodating chamber; 9: Feed pump; 10: Discharge valve; 11: Stirring assembly; 111: Drive shaft; 112: Stirring blade; 12: Interference assembly; 121: Interference column; 13: Density meter; 14: Controller; 15: Concentrated material discharge pipe; 16: Fixed plate. DETAILED DESCRIPTION

[0032] The embodiments of the present invention will be further described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0033] Figure 1 This is a schematic diagram of a device for separating residual carbon from coal gasification slag according to an embodiment of the present invention. Figure 1 As shown, the device for separating residual carbon in coal gasification slag includes a shell 1, a feed pipe 2, an overflow trough 3, a tailings discharge pipe 4, a water flow rising distribution plate 5, a liquid inlet pipe 6 and an ultrasonic generator 7.

[0034] A accommodating chamber 8 is provided in the shell 1, and the shell 1 is provided with a liquid inlet, a concentrate outlet and a tailings outlet connected to the accommodating chamber 8; the feed pipe 2 is mounted in the accommodating chamber 8, and a feed pump 9 is installed on it; the overflow trough 3 is sleeved on the shell 1 at one end of the concentrate outlet, and the overflow trough 3 is provided with a discharge port; the tailings discharge pipe 4 is connected to the tailings outlet, and a discharge valve 10 is provided on the tailings discharge pipe 4; the first end of the water flow rising distribution plate 5 is connected to the inner wall of the shell 1, and the second end of the water flow rising distribution plate 5 is connected to the end of the tailings discharge pipe 4 inserted into the accommodating chamber 8, and covers the cross section between the inner wall of the shell 1 and the tailings discharge pipe 4, the water flow rising distribution plate 5 is provided with a plurality of through holes, and the liquid inlet is opened on the side of the water flow rising distribution plate 5 facing the tailings outlet; the liquid inlet pipe 6 is connected to the liquid inlet; the ultrasonic generator 7 is arranged in the accommodating chamber 8.

[0035] When the device is in use, the feed pump 9 is started, and the prefabricated slurry enters the shell 1 through the feed pipe 2, and the water flows into the shell 1 through the liquid inlet pipe 6 at the bottom, and continues to rise through the multiple through holes opened on the water flow rising distribution plate 5, and is evenly distributed in the shell 1, the slurry is mixed with the water flow, and the relative density between the gasification slag particles of different components in the slurry and the water flow is different. The carbon-rich slag with smaller density in the gasification slag particles tends to float up, and the ash particles and molten slag with larger density tend to sink. At the same time, the ultrasonic generator 7 is started, and the ultrasonic generator 7 emits ultrasonic waves. Under the high-frequency vibration of the ultrasonic waves, the density difference between the gasification slag particles is enhanced, and the carbon-rich slag with smaller density tends to float up. The slag completely floats to the fine material outlet, and is discharged to the overflow trough 3 sleeved with the shell 1 through the fine material outlet under the action of water flow, and is finally discharged and collected through the discharge port of the overflow trough 3; while the ash particles and molten slag with higher density completely sink and are intercepted on the water flow rising distribution plate 5, and slide down along the water flow rising distribution plate 5 and gather to the tailing discharge pipe 4. After the device has been running for a period of time, or when it is judged that there are too many ash particles, molten slag and other sedimented residues gathered in the tailing discharge pipe 4, the discharge valve 10 in the tailing discharge pipe 4 is opened to discharge and collect the ash particles and molten slag, thereby completing the separation of carbon-rich slag from ash particles and molten slag in the ore slurry, that is, completing the separation of fine material and tailings in the ore slurry.

[0036] In the device for separating residual carbon from coal gasification slag of the present invention, slurry is injected into the shell 1 through the upper feed pipe 2, and water flows into the shell 1 through the lower liquid inlet pipe 6 and the water flow rising distribution plate 5. While the rising water flow interacts with the descending slurry, the ultrasonic generator 7 in the shell 1 emits ultrasonic waves, which enhance the density difference with the help of ultrasonic waves, thereby improving the separation accuracy and separation efficiency of carbon ash in coal gasification slag.

[0037] In this embodiment, if Figure 1 As shown, the shell 1 is a hollow cylinder with an open upper surface and an opening forming the fine material outlet. The overflow trough 3 is circumferentially installed on the outer wall of the shell 1 at one end of the fine material outlet. The tailings outlet is opened at the center of the lower surface and is connected to the tailings discharge pipe 4. The upper end of the tailings discharge pipe 4 is inserted into the shell 1 for a distance. A plurality of through holes are evenly penetrated on the water flow rising distribution plate 5. The opposite ends are fixedly connected to the inner wall of the shell 1 and the outer wall of the upper end of the tailings discharge pipe 4, and are inclined at a certain angle toward the tailings discharge pipe 4, so that the gasification slag particles with higher density that fall after sorting fall completely onto the water flow rising distribution plate 5 and slide along the inclined surface of the water flow rising distribution plate 5 to the tailings discharge pipe 4. Figure 1As shown, the liquid inlet is located on the left side of the bottom of the housing 1, below the position of the water flow rising distribution plate 5, and is connected to the liquid inlet pipe 6. After entering the housing 1 through the liquid inlet pipe 6, the water is evenly dispersed by the water flow rising distribution plate 5 and continues to rise. The feed pipe 2 is installed at the center of the housing 1. Under the action of the feed pump 9, the slurry is drained into the housing 1 and mixed with the rising water. In this embodiment, four ultrasonic generators 7 are provided and can be installed at any position within the housing 1, as long as the ultrasonic waves emitted can act on the coal gasification slag particles in the slurry to enhance the density difference between the particles. According to the actual application, the number of ultrasonic generators 7 can be adjusted, the shape and size of the shell 1 and the specific opening positions of the liquid inlet, the concentrate outlet and the tailings outlet on the shell 1 can be adjusted, and the specific inclination angle of the water flow rising distribution plate 5 can be adjusted. As long as the injected slurry and water flow can be fully mixed under the action of the ultrasonic waves emitted by the ultrasonic generator 7, the different coal gasification slag particles in the slurry can strengthen the density difference, the particles with lower density can completely float up and be discharged through the concentrate outlet and the overflow trough 3, and the particles with higher density can completely sink and be discharged through the tailings discharge pipe 4. The slurry feed rate entering through the feed pipe 2 and the rising water flow entering through the liquid inlet pipe 6 can also be adjusted. By controlling the rising water flow rate and the slurry feed rate, etc., the separation of products with different density levels can be achieved.

[0038] Optionally, the device for separating residual carbon from coal gasification slag further comprises a stirring assembly 11, which is mounted in the accommodating chamber 8. The stirring assembly 11 is provided to fully stir the slurry and water flow in the shell 1, so that the coal gasification slag particles in the slurry are evenly dispersed in the shell 1, thereby strengthening carbon-ash separation and improving the effect of gravity separation.

[0039] In this embodiment, four sets of stirring assemblies 11 are provided. A fixed plate 16 is sleeved around the circumference of the feed pipe 2, and the four sets of stirring assemblies 11 are installed on the fixed plate 16 at intervals. When the device is in operation, the stirring assemblies 11 are activated simultaneously with the feed pump 9 and the ultrasonic generator 7. The number of stirring assemblies 11 provided can be adjusted according to actual application, and any structural form can be adopted, as long as they can fully stir the slurry and water entering the housing 1.

[0040] Optionally, the stirring assembly 11 includes a motor (not shown), a transmission shaft 111, and stirring blades 112. The motor is mounted within the accommodating chamber 8; the transmission shaft 111 is drivingly connected to the motor; and the stirring blades 112 are fixedly connected to the transmission shaft 111. This arrangement simplifies the structure of the stirring assembly 11 and facilitates assembly and operation.

[0041] In this embodiment, if Figure 1 As shown, there are four groups of stirring components 11, which are installed at intervals on the fixed plate 16 that is sleeved around the feeding pipe 2. The motors in each group of stirring components 11 are fixed on the fixed plate 16, the transmission shaft 111 is fixedly connected to the output shaft of the motor, and the plurality of stirring blades 112 are fixed at intervals around the lower end of the transmission shaft 111. When the motor is started, the motor drives its output shaft to rotate, and then drives the transmission shaft 111 fixedly connected to the output shaft to rotate in the same direction, and finally drives the plurality of stirring blades 112 fixedly connected to the transmission shaft 111 to rotate in the same direction, thereby fully stirring the slurry and water flow in the shell 1. In this embodiment, Figure 1 An ultrasonic generator 7 is installed at the lower end of each of the transmission shafts 111.

[0042] Optionally, the device for sorting residual carbon in coal gasification slag further includes an interference component 12, which is connected to the inner wall of the accommodating chamber 8 on the side of the water flow rising distribution plate 5 facing away from the tailings outlet, and is used to prevent the occurrence of channeling or vortex flow in the shell 1. If channeling or vortex flow occurs in the shell 1, the slurry and the water flow cannot be fully mixed, and the coal gasification slag particles in the slurry cannot be fully sorted according to density differences. The provision of the interference component 12 fully affects the movement state of water and ash, interferes with the generation of channeling or vortex flow, and can enhance carbon-ash separation and improve the effect of gravity sorting.

[0043] like Figure 1 As shown, in this embodiment, the interference component 12 is disposed in the space between the stirring component 11 and the water flow rising distribution plate 5. Depending on the actual application, the interference component 12 can be composed of any structure as long as it can affect the movement of water and ash and avoid the generation of channel flow or vortex flow.

[0044] Optionally, the interference component 12 includes a plurality of interference columns 121, and the plurality of interference columns 121 are connected to the inner wall of the accommodating cavity 8 at intervals. This arrangement simplifies the structural composition of the interference component 12 and facilitates assembly and operation.

[0045] like Figure 1As shown, in this embodiment, the interference columns 121 are cylindrical rods. Multiple interference columns 121 are arranged parallel to each other and fixed to the inner wall of the housing 1 in three horizontal rows. The water rising through the water flow distribution plate 5 and the slurry entering the housing 1 through the feed pipe 2 pass through the gaps between adjacent interference columns 121 and are fully mixed. The shape, size, number of interference columns 121, and specific connection position with the inner wall of the housing 1 can be adjusted according to actual application.

[0046] Optionally, the apparatus for separating residual carbon from coal gasification slag further includes a densitometer 13 and a controller 14. The densitometer 13 is disposed within the accommodating chamber 8; the input end of the controller 14 is communicatively connected to the output end of the densitometer 13, and the output end of the controller 14 is communicatively connected to the control end of the discharge valve 10. In this configuration, the controller 14 automatically opens or closes the discharge valve 10 based on density data monitored by the densitometer 13, thereby achieving automatic discharge of tailings.

[0047] In this embodiment, the discharge valve 10 is an electrically controlled valve, and the densitometer 13 monitors the density data of the mixture of slurry and water injected into the accommodating chamber 8 in real time, and transmits the density data to the controller 14. A set density threshold is pre-stored in the controller 14. When the density data is greater than or equal to the set density threshold, it indicates that there are too many ash particles and molten slag with high density that have sunk and accumulated in the accommodating chamber 8 to the water flow rising distribution plate 5 and the tailing discharge pipe 4. At this time, the controller 14 controls the discharge valve 10 to open, and the ash particles, molten slag and other sediments are discharged through the tailing discharge pipe 4. When the density data is less than the set density threshold, it indicates that the ash particles and molten slag with high density that have sunk and accumulated in the accommodating chamber 8 to the water flow rising distribution plate 5 and the tailing discharge pipe 4 are within a reasonable range. At this time, the controller 14 controls the discharge valve 10 to close, and the ash particles, molten slag and other sediments stop being discharged. The controller 14 controls the discharge valve 10 to open or close according to the density data. This control logic can be implemented using an existing mature algorithm, and its specific working principle is not described in detail here. Depending on the actual application, the densitometer 13 can be any commercially available model that meets the requirements for measuring the density of the mixture.

[0048] Optionally, the device for separating residual carbon from coal gasification slag further includes a pressure gauge (not shown), which is disposed within the accommodating chamber 8, with an output end of the pressure gauge communicatively connected to an input end of the controller 14. In this configuration, the controller 14 controls the automatic opening or closing of the discharge valve 10 based on pressure data monitored by the pressure gauge and density data monitored by the densitometer 13, thereby preventing a single component failure from causing an opening or closing failure of the discharge valve 10.

[0049] In this embodiment, the pressure gauge monitors the pressure data of the mixture of slurry and water flow injected into the accommodating chamber 8 in real time, and transmits the pressure data to the controller 14. A set pressure threshold is pre-stored in the controller 14. When the pressure data is greater than or equal to the set pressure threshold, it indicates that there are too many ash particles and molten slag with high density that have sunk and accumulated in the accommodating chamber 8 to the water flow rising distribution plate 5 and the tailing discharge pipe 4. At this time, the controller 14 controls the discharge valve 10 to open, and the ash particles, molten slag and other sediments are discharged through the tailing discharge pipe 4. When the pressure data is less than the set pressure threshold, it indicates that the ash particles and molten slag with high density that have sunk and accumulated in the accommodating chamber 8 to the water flow rising distribution plate 5 and the tailing discharge pipe 4 are within a reasonable range. At this time, the controller 14 controls the discharge valve 10 to close, and the ash particles, molten slag and other sediments stop being discharged. When the density meter 13 and the pressure gauge are working normally, the correspondence between the density data and the set density threshold, and the correspondence between the pressure data and the set pressure threshold match. Therefore, the conclusion of the controller 14 on controlling the opening or closing of the discharge valve 10 are consistent. When the density meter 13 (the pressure gauge) fails and cannot work, the controller 14 controls the opening and closing of the discharge valve 10 according to the measurement results of the pressure gauge (the density meter 13).

[0050] Optionally, the device for separating residual carbon from coal gasification slag further includes a fine material discharge pipe 15, which is connected to the outer wall of the housing 1 and communicates with the discharge port. In this arrangement, the low-density carbon-rich slag that overflows into the overflow trough 3 falls into the discharge pipe 15 through the discharge port. The discharge pipe 15 can be extended to a set position, thereby facilitating the collection of the carbon-rich slag.

[0051] In this embodiment, if Figure 1 As shown, the fine material discharge pipe 15 is fixed to the top left outer wall of the housing 1 and has a feed port corresponding to the discharge port of the overflow trough 3. Thus, the carbon-rich residue that floats up from the accommodating chamber 8 and overflows into the overflow trough 3 enters the feed port of the fine material discharge pipe 15 through the discharge port and is ultimately discharged and collected through the fine material discharge pipe 15. To facilitate the accumulation of carbon-rich residue, the overflow trough 3 can be inclined at a certain angle toward the discharge port.

[0052] The following combination Figure 1 The following further describes the use of the device for separating residual carbon from coal gasification slag:

[0053] When the device is in use, the feed pump 9 is started, and the prefabricated slurry enters the shell 1 through the feed pipe 2, and the water flows into the shell 1 through the lower liquid inlet pipe 6, and continues to rise after being evenly distributed through the multiple through holes opened on the water flow rising distribution plate 5. The rising water flow and the injected slurry pass through the gaps between the adjacent interference columns 121 and are fully mixed. At the same time, the ultrasonic generator 7 and the stirring component 11 are started, and the stirring component 11 is used to achieve uniform dispersion of the gasification slag in the containing chamber 8, and ultrasonic enhancement is used to promote the carbon-ash separation in the gasification slag particles. The interference column 121 is used to prevent the occurrence of channel flow or large vortex flow in the containing chamber 8 to affect the separation effect, so that under the joint action of multiple forces, the movement state of water and ash is fully affected, and the density difference between the gasification slag particles is enhanced. The carbon-rich slag with lower density is completely floated to the fine material outlet, and is discharged to the overflow trough 3 sleeved on the shell 1 through the fine material outlet under the action of water flow, and is finally discharged and collected through the discharge port of the overflow trough 3 and the fine material discharge pipe 15; while the ash particles and molten slag with higher density completely sink and are intercepted on the water flow rising distribution plate 5, and slide down along the water flow rising distribution plate 5 to gather in the tailing material discharge pipe 4. The densitometer 13 monitors the density data in the accommodating chamber 8 in real time, and the pressure gauge monitors the pressure data in the accommodating chamber 8 in real time. The controller 14 controls the discharge valve 10 in the tailings discharge pipe 4 to automatically open or close according to the changes in the density data and the pressure data, thereby realizing the automatic discharge and collection of sediment such as ash particles and molten slag, thereby completing the separation of carbon-rich slag from ash particles and molten slag in the slurry, that is, completing the separation of concentrate and tailings in the slurry.

[0054] In the device for separating residual carbon from coal gasification slag of the present invention, slurry is injected into the shell 1 through the upper feed pipe 2, and water flows into the shell 1 through the lower liquid inlet pipe 6 and the water flow rising distribution plate 5. While the rising water flow interacts with the descending slurry, the ultrasonic generator 7 in the shell 1 emits ultrasonic waves, which enhance the density difference with the help of ultrasonic waves, thereby improving the separation accuracy and separation efficiency of carbon ash in coal gasification slag.

[0055] The present invention further provides a method for separating carbon residue in coal gasification slag, which is based on the device for separating carbon residue in coal gasification slag described in any of the above embodiments, comprising the following steps:

[0056] S1: Add water to the coal gasification slag to prepare a slurry of a set concentration.

[0057] The large amount of coal gasification slag to be separated is sent to the slurry preparation device through the conveying equipment, and water is added to the coal gasification slag and fully stirred to fully disperse it to prepare a slurry with a mass concentration of 50-300g / L.

[0058] S2: The slurry is wet screened and classified, particles smaller than a set particle size are directly collected after filtration, and particles greater than or equal to the set particle size are screened into slurries of different particle sizes.

[0059] The coal gasification slag is uniformly sampled using random multi-point sampling and cone quartering methods. The representative coal gasification slag is dried and then mechanically screened (8-10 particle sizes) to obtain the residual carbon content and yield characteristics of the slag at different particle size levels. 2-5 screening particle sizes are determined based on the carbon content distribution and particle size distribution. Based on the determined screening particle size, the slurry is wet-screened and graded using multi-stage mechanical screens, including linear vibrating screens, grading screens, drum screens and other screening equipment for wet particle size classification. Particles smaller than the set particle size (carbon content <10%) are directly treated as high-ash slag or carbon-containing slag after filtration and are no longer sorted. Particles larger than the set particle size are screened into fine slag slurry of multiple particle size levels based on the determined screening particle size.

[0060] S3: injecting slurries of different particle sizes into the shell of the device for separating residual carbon from coal gasification slag respectively, and performing separation respectively, discharging upper slag from the discharge port of the overflow trough, and discharging lower slag from the tailing discharge pipe.

[0061] The slurry feed rate and rising water flow rate of the device for separating residual carbon from coal gasification slag are adjusted for different slurry particle sizes. By controlling the rising water flow rate and slurry feed rate, products of different density grades can be separated. Particle separation conditions vary for different particle size gradients. Slurry of different particle sizes is divided into different particle sizes and injected into the device separately, where the density difference is used to separate the upper slag from the lower slag. This can reduce mutual interference between particles of different sizes during the separation process.

[0062] S4: The upper scum is filtered to obtain a concentrate, and the lower sediment is filtered to obtain a tailing.

[0063] The water content of the concentrate and tailings after filtration is less than 30%, making them easier to transport and process. The tailings, with their low carbon content, can be used directly as building materials and roadbed fillers. The concentrate, with its higher carbon content, can be used for high-value applications such as rubber fillers and catalyst carriers.

[0064] The method of separating residual carbon from coal gasification slag of the present invention concentrates the particles within a certain particle size range through particle size classification, reduces mutual interference between particles of different particle sizes during the separation process, strengthens the density difference of the gasification slag particles through the ultrasonic generator 7, and realizes the separation of carbon ash from ash slag under water medium conditions. The production process is simple, energy consumption is low, and there is no secondary pollution. At the same time, the separation accuracy and separation efficiency are high, the requirements for the material conditions of the gasification slag are relatively low, and the method has a wide range of applications.

[0065] Optionally, the filtrate after the upper scum and the lower sediment are filtered and recycled as circulating water.

[0066] After the filtrate from the upper scum and the lower sediment is filtered, a portion of the filtrate is added to the coal gasification slag raw material to prepare the slurry, a portion is used as spray water for the screening equipment, and a portion enters the shell 1 through the liquid inlet pipe 6 to provide an upward water flow, and is used as a sorting medium to re-participate in the sorting process of the upper scum and the lower sediment.

[0067] The flow chart of the above method for separating carbon residue from coal gasification slag is as follows: Figure 2 shown.

[0068] The following is an example of using the present invention to separate residual carbon from coal gasification slag.

[0069] Example 1

[0070] The present invention is used to separate the residual carbon in Xinjiang coal gasification fine slag, and the separation steps are as follows:

[0071] (1) Through preliminary experiments, it was determined that the coal gasification slag can be screened into four particle sizes.

[0072] (2) The gasified fine slag is fed into the slurry preparation tank through a conveying device, and water is added to the fine slag and stirred thoroughly to fully disperse it to prepare a slurry with a mass concentration of 200 g / L.

[0073] (3) The slurry is wet screened and classified using a vibrating screen. The fine particles with a particle size of less than 74 μm are directly used as the carbon slag product after filter pressing; the particles with a particle size of greater than 74 μm are screened into three fine slag slurries with particle sizes of greater than 450 μm, 150-450 μm, and 74-150 μm for sorting;

[0074] (4) The ore pulps of the above three particle size ranges are respectively injected into the shell 1 through the upper feed pipe 2, and the water enters the shell 1 through the water flow rising distribution plate 5. Under the action of the ultrasonic generator 7, the interference column 121 and the stirring assembly 11, the density difference of the gasified slag particles is enhanced inside the shell 1 to complete the separation. The carbon-rich slag floats up to obtain the fine material due to its lighter density, and the ash particles and molten slag with larger density fall onto the water flow rising distribution plate 5 and are further discharged from the tailings discharge pipe 4 to obtain tailings.

[0075] (5) The carbon contents of the concentrate and tailings obtained after separation are shown in Table 1. The carbon contents of the concentrate in the three particle size segments are all greater than 80%. The carbon content of the concentrate is 85.85%, and the ash content of the tailings is 73.54%.

[0076] Table 1 Results of carbon residue separation from fine slag in Xinjiang

[0077]

[0078] Example 2

[0079] The present invention is used to separate the residual carbon from the coarse slag from Yulin coal gasification, and the separation steps are as follows:

[0080] (1) Through preliminary experiments, it was determined that the coal gasification slag could be screened into three particle sizes.

[0081] (2) The gasified coarse slag is transported into the slurry preparation tank through a conveying device, and water is added to the coarse slag and stirred thoroughly to fully disperse them to prepare a slurry with a mass concentration of 100 g / L;

[0082] (3) The slurry is wet screened and classified using a vibrating screen. The fine particles with a particle size of <200 μm are directly collected after filtration; the particles >200 μm are screened into two particle sizes of fine slag slurry: >450 μm and 200-450 μm for sorting;

[0083] (4) The ore pulps of the above two particle size ranges are respectively injected into the shell 1 through the upper feed pipe 2, and the water enters the shell 1 through the water flow rising distribution plate 5. Under the action of the ultrasonic generator 7, the interference column 121 and the stirring assembly 11, the density difference of the gasified slag particles is enhanced inside the shell 1 to complete the separation. The carbon-rich slag floats up to obtain the fine material due to its lighter density, and the ash particles and molten slag with larger density fall onto the water flow rising distribution plate 5 and are further discharged from the tailings discharge pipe 4 to obtain tailings.

[0084] (5) The carbon contents of the concentrate and tailings obtained after separation are shown in Table 2. The carbon contents of the concentrate with particle size of >450 μm and 200-450 μm are 77.60% and 66.17%, respectively. The carbon content of the concentrate is 66.99%, and the ash content of the tailings is 11.17%.

[0085] Table 2 Results of residual carbon from Yulin coarse slag separation

[0086]

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for separating carbon residue from coal gasification slag, characterized in that: include: A housing is provided with a receiving cavity, and the housing is provided with a liquid inlet, a concentrate outlet, and a tailings outlet communicated with the receiving cavity; A feed pipe is installed in the accommodating cavity and a feed pump is installed on the feed pipe; An overflow trough, wherein the housing is sleeved on one end of the concentrate outlet and the overflow trough is provided with a discharge port; a tailings discharge pipe, the tailings discharge pipe being in communication with the tailings outlet and being provided with a discharge valve; a water flow rising distribution plate, wherein a first end of the water flow rising distribution plate is connected to the inner wall of the shell, a second end of the water flow rising distribution plate is connected to one end of the tailings discharge pipe inserted into the accommodating cavity, and covers the cross section between the inner wall of the shell and the tailings discharge pipe, a plurality of through holes are formed on the water flow rising distribution plate, and the liquid inlet is formed on a side of the water flow rising distribution plate facing the tailings outlet; a liquid inlet pipe, the liquid inlet pipe being connected to the liquid inlet; an ultrasonic generator, the ultrasonic generator being disposed in the accommodating cavity; A stirring assembly, the stirring assembly being mounted in the accommodating chamber; The stirring assembly comprises: a motor, the motor being mounted in the accommodating cavity; A transmission shaft, the transmission shaft being drivingly connected to the motor; A stirring blade, wherein the stirring blade is fixedly connected to the transmission shaft; The device for separating residual carbon from coal gasification slag further includes: an interference component connected to the inner wall of the accommodating chamber on a side of the water flow rising distribution plate facing away from the tailings outlet, for preventing channel flow or vortex flow from occurring in the housing; The interference component includes: a plurality of interference columns, and the plurality of interference columns are connected to the inner wall of the accommodating cavity at intervals.

2. The device for separating residual carbon from coal gasification slag according to claim 1, characterized in that: Also includes: a densitometer, the densitometer being disposed in the accommodating cavity; A controller, wherein the input end of the controller is communicatively connected to the output end of the densitometer, and the output end of the controller is communicatively connected to the control end of the discharge valve.

3. The device for separating residual carbon from coal gasification slag according to claim 2, characterized in that: Also includes: A pressure gauge is provided in the accommodating cavity, and an output end of the pressure gauge is communicatively connected to an input end of the controller.

4. The device for separating residual carbon from coal gasification slag according to any one of claims 1 to 3, characterized in that: Also includes: A concentrate discharge pipe is connected to the outer wall of the shell and communicated with the discharge port.

5. A method for separating carbon residue from coal gasification slag, characterized in that: The device for separating residual carbon from coal gasification slag according to any one of claims 1 to 4 comprises the following steps: Add water to the coal gasification slag to prepare a slurry of a set concentration; The slurry is wet screened and classified, particles smaller than a set particle size are directly collected after filtration, and particles greater than or equal to the set particle size are screened into slurries of different particle sizes; The ore pulps of different particle sizes are respectively injected into the shell of the device for separating the residual carbon in the coal gasification slag, and are separated respectively. The upper slag is discharged from the discharge port of the overflow trough, and the lower slag is discharged from the tailing discharge pipe. The upper scum is filtered to obtain the concentrate, and the lower sediment is filtered to obtain the tailings.

6. The method for separating carbon residue from coal gasification slag according to claim 5, characterized in that: The filtrate after the upper scum and the lower sediment are filtered is filtered and then recycled as circulating water.

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