CN113350881B - Slag-water separation method for gasification furnace - Google Patents
Slag-water separation method for gasification furnace Download PDFInfo
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- CN113350881B CN113350881B CN202110581725.4A CN202110581725A CN113350881B CN 113350881 B CN113350881 B CN 113350881B CN 202110581725 A CN202110581725 A CN 202110581725A CN 113350881 B CN113350881 B CN 113350881B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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Abstract
The invention discloses a slag-water separation method for a gasification furnace, belonging to the field of coal gasification, and aiming at solving the technical problem of improving the slag-water separation effect of the gasification furnace and simultaneously reducing the equipment and maintenance cost, the technical scheme is as follows: the method comprises the following specific steps: s1, when the slag collecting time of the gasification slag lock bucket reaches the preset time, slag discharge is started, and meanwhile, a washing water pipe of the gasification slag lock bucket is opened for large-flow washing; s2, enabling slag water discharged by the gasification furnace slag lock hopper to flow into the primary slag-water separation structure through the feeding barrel and the anti-collision cap; s3, feeding the black water separated by the primary slag-water separation structure into a slag-water separation tank, conveying the slag separated by the primary slag-water separation structure into a secondary slag-water separation structure by a screw conveyor for slag-water separation again, and conveying the slag with qualified water content after separation to a storage yard by a belt; and S4, the ash water separated by the secondary slag-water separation structure enters a slag-water separation tank, a remote liquid level meter is installed in the slag-water separation tank, and a water pump is automatically started and stopped to operate according to the liquid level.
Description
Technical Field
The invention relates to the technical field of coal gasification, in particular to a slag-water separation method for a gasification furnace.
Background
In recent years, various dry powder and coal water slurry furnaces are developed in sequence, but all high-temperature furnace slag from a gasification furnace needs to be quenched by water and then intensively discharged, so that the instantaneous discharged slag water amount is large, a slag-water mixture formed after water quenching is not easy to separate, and the corrosion of black water and the abrasion of ash residues are strong. With the continuous upgrading of the environment-friendly situation, the water content after the slag-water separation is required to meet the environment-friendly requirement.
In the field of coal chemical industry, both pulverized coal gasification and coal water slurry gasification, the residual high-temperature slag after the reaction of coal and oxygen is collected by a slag lock hopper for about half an hour for the next time, so that the slag is thoroughly discharged and is washed by high-flow flushing water, and the instantaneous slag water amount is larger. The scraper slag conveyor is popularized and applied in the field of coal gasification at present, but the scraper slag conveyor has a plurality of running parts, a scraper chain is quickly worn, the material returning efficiency is low, the structure is complex, the fault is easy to occur, and the scraper slag conveyor becomes large-scale running equipment with the highest fault rate of various coal chemical enterprises. Meanwhile, the traditional slag conveyor firstly settles and drags slag in the blanking slag pool and then discharges the slag to the auxiliary slag pool through the balance pipe, so that the size of the slag conveyor needs to load all slag water at the same time, and the size is larger.
Disclosure of Invention
The technical task of the invention is to provide a slag-water separation method for a gasification furnace, which solves the problems of improving the slag-water separation effect of the gasification furnace and reducing the equipment and maintenance cost.
The technical task of the invention is realized in the following way, and the method for separating the slag and the water for the gasification furnace comprises the following steps:
s1, when the slag collecting time of the gasification furnace slag lock bucket reaches the preset time, slag begins to be discharged, and meanwhile, a washing water pipe of the gasification furnace slag lock bucket is opened for large-flow washing;
s2, enabling slag water discharged by the gasification furnace slag lock hopper to flow into the primary slag-water separation structure through the feeding barrel and the anti-collision cap;
s3, feeding the black water separated by the primary slag-water separation structure into a slag-water separation tank, conveying the slag separated by the primary slag-water separation structure into a secondary slag-water separation structure by a screw conveyor for slag-water separation again, and conveying the separated slag with qualified water content to a storage yard by a belt;
and S4, the ash water separated by the secondary slag-water separation structure enters a slag-water separation tank, a remote liquid level meter is installed in the slag-water separation tank, and a water pump is automatically started and stopped to operate according to the liquid level, so that full-process automatic operation is realized.
Preferably, the lower end of the feeding cylinder is provided with a splash guard which is in an inverted funnel shape and is positioned above the primary separation grating net.
Preferably, the primary slag-water separation structure is a funnel-shaped structure consisting of at least four primary separation grid nets; the bottom of the funnel-shaped primary slag-water separation structure is provided with a U-shaped groove, a spiral body of a spiral conveyor is arranged in the U-shaped groove, and the spiral body is used for conveying coarse slag collected by the primary separation grid net;
one side of the first-stage separation grid net far away from the U-shaped groove is provided with a vibration motor which is positioned on the lower side surface of the first-stage separation grid net to prevent slag from accumulating and not falling.
Preferably, the anti-collision cap is in a herringbone shape, at least four spring supporting assemblies are arranged between the herringbone anti-collision cap and the primary separation grid net, each spring supporting assembly comprises a supporting spring and a spring sleeve, the spring sleeves are sleeved on the outer sides of the supporting springs, one end of each supporting spring is fixed on the anti-collision cap, and the other end of each supporting spring is fixed on the primary separation grid net.
Preferably, the inner side wall of the U-shaped groove is provided with a wear-resistant lining layer, and the wear-resistant lining layer is a wear-resistant layer made of a wear-resistant alloy material or a sprayed ceramic wear-resistant material;
or the like, or, alternatively,
the U-shaped groove is of a groove structure formed by a grid net layer and a black water collecting groove arranged on the outer side of the grid net layer, and the black water collecting groove is communicated with the slag-water separation groove.
Preferably, the spiral conveyor adjusts the rotating speed of the spiral conveyor through a planetary gear reducer and a variable-frequency explosion-proof motor, a torque detection device is mounted on the variable-frequency explosion-proof motor, and the spiral conveyor gives an alarm or stops when the torque of the torque detection device exceeds a set value so as to protect equipment; the method specifically comprises the following steps: judging through the current of the screw conveyer, when the normal working current of the variable-frequency explosion-proof motor is 18A, and the loaded working current is not more than 20A, arranging an alarm device in the DCS, automatically alarming when the detected current is more than 20A, indicating that the system is abnormal, automatically stopping the system in a chain manner, and checking whether foreign object clamping equipment exists or not on site;
a second-stage slag-water separation structure is arranged at the outlet end of the screw conveyor and comprises a second-stage water collecting tank, a second-stage vibrating screen is arranged at the position close to the upper part of the middle part of the second-stage water collecting tank, and the lower end of the second-stage water collecting tank is communicated with the slag-water separation tank; two side walls of the secondary vibrating screen are respectively provided with a vibrating screen bracket;
still be provided with stall alarm device on the screw conveyer, stall alarm device includes stall warning toothed disc and installs the stall warning probe on stall warning toothed disc, stall warning toothed disc and screw conveyer synchronous revolution, whether stall warning probe monitoring stall warning toothed disc is rotatory:
if the stall alarm gear disc stops rotating, the stall alarm probe signal is lost for more than 10 seconds simultaneously or the signal is continuously input for more than 10 seconds, the alarm fault is judged, the alarm signal interlocks the spiral conveyor to stop, and the accident is prevented from further expanding.
Preferably, the spiral body adopts an axial spiral body or an axial-free spiral body, and a wear-resistant alloy layer is welded on the outer surface of the spiral body;
a spiral body sweeper is arranged on one side of the spiral body close to the outlet end of the spiral conveyor, and the distance between the spiral body sweeper and the center of the spiral body is 0-1 mm; the radian of the spiral blade sweeper is consistent with that of the blade on the outer side of the spiral body, and the spiral blade sweeper is connected with the blade on the outer side of the spiral body through an adjusting spring; the spiral blade sweeper is made of wear-resistant alloy, and the thickness of the spiral blade sweeper is 10-20 mm.
Preferably, an inspection manhole is arranged at the bottom of the slag-water separation tank, and a sewage draining outlet is arranged outside the inspection manhole;
a flushing water pipeline is arranged on one side of the slag-water separation tank, which is far away from the water pump;
the volume of the slag-water separation tank is not less than that of the gasification furnace slag lock hopper, so that the slag water is prevented from overflowing;
preferably, a support frame is arranged between the primary separation grid net and the slag-water separation tank, one end of the support frame is fixedly connected with the lower side surface of the primary separation grid net, and the other end of the support frame is fixed at the bottom of the slag-water separation tank; the support frame is made of I-shaped steel and channel steel;
the volume of the funnel-shaped primary slag-water separation structure is not less than that of the gasification furnace slag lock hopper, so that the slag water is prevented from overflowing.
Preferably, the first-stage separation grid net is formed by splicing small grid nets with the same specification and fixedly spliced by bolts, so that the first-stage separation grid net is convenient to disassemble and assemble; in order to ensure the slag falling effect, the angle of the grating net on the primary separation grating net is not less than 45 degrees;
or the like, or, alternatively,
the primary separation grid net is of a plate-shaped structure consisting of a plurality of stainless steel plates with the distance of 1-1.5mm, the thickness of 1mm and the width of 30 mm;
or the like, or, alternatively,
the primary separation grid net is of a plate-shaped structure consisting of a plurality of integrally formed battens made of polyurethane materials with the interval of 1-1.5 mm;
or the like, or, alternatively,
the first-stage separation grating net is a filtering structure consisting of a filtering grating net and a separating plate, the filtering grating net is arranged close to one side of the U-shaped groove, the separating plate is positioned below the lower edge of the anti-collision cap, a plurality of filtering holes which are arranged at intervals are formed in the separating plate, the filtering holes are inclined upwards relative to the horizontal direction, and the included angle between the filtering holes and the horizontal direction is 30-60 degrees.
The slag-water separation method for the gasification furnace has the following advantages:
the slag-water mixture discharged by the gasification furnace slag lock hopper falls into a primary separation grid net through a feeding cylinder, an anti-collision cap is arranged above the primary separation grid net to reduce the washing of slag-water on a screw conveyor, and the slag-water is separated by the primary separation grid net and then conveyed to a secondary vibrating screen by the screw conveyor for slag-water separation again;
the slag water of the gasifier after water chilling is collected into coarse slag through a funnel formed by a primary separation grid net, the black water enters a slag-water separation tank through the primary separation grid net, the slag water discharged by a gasifier slag lock bucket is separated and then transported, and if the black water directly falls into a box body, the slag water cannot be transported at all by adopting a screw conveyor; the separated coarse slag is conveyed to a secondary vibrating screen through a screw conveyor at the bottom of the hopper, and is conveyed out after being separated again through the secondary vibrating screen, the slag-water separation effect of the invention is good (the water content can be controlled below 15%), the equipment volume is small, the number of running parts is small, the equipment manufacturing cost (the cost of the same-scale equipment can be reduced by one half compared with that of a slag conveyor), the maintenance cost is low (the cost of spare parts can be reduced by two thirds every year compared with that of the slag conveyor), the technology is mature and easy to manufacture, and the first application of the screw conveying on the slag-water separation of the gasification device is successfully realized;
the collision-proof cap is arranged above the spiral body and below the feeding cylinder, so that the spiral body can be prevented from being directly washed by materials, the load of the spiral conveyor can be evenly distributed by controlling the distance between the collision-proof cap and the primary separation grid net, and the phenomenon that the spiral conveyor is overloaded and jumps when the materials fall quickly at the beginning is prevented;
fourthly, the stall warning mechanism is used for detecting the running condition of the screw conveyor;
the spiral blade sweeper is used for removing fine slag on the outer side blade of the spiral body at the outlet, preventing the fine slag from being extruded to increase the operation load and improving the operation efficiency of equipment;
the slag-water separation tank is made of a carbon steel plate lining stainless steel plate, so that black water is prevented from corroding equipment, the volume of the slag-water separation tank is larger than that of a gasification furnace slag lock hopper, a remote liquid level meter is arranged in the slag-water separation tank, a water pump can be automatically controlled to operate according to the liquid level, and the black water is pumped into a settling tank through the water pump and a pipeline to settle; the lower part of the slag-water separation tank is provided with at least 2 DN100 sewage outlets, and a flushing water pipeline is arranged opposite to the outlet of the water pump, so that bottom sludge can be flushed conveniently;
and (seventhly) the vibration motor is arranged on the outer side wall of the primary separation grid net to prevent the slag from accumulating and falling.
Therefore, the invention has the characteristics of reasonable design, simple structure, easy processing, small volume, convenient use, multiple purposes and the like, thereby having good popularization and use values.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a slag-water separation device for a gasification furnace;
FIG. 2 is a schematic structural view of a screw conveyor;
FIG. 3 is a schematic view of the installation of a U-shaped groove and a spiral body;
FIG. 4 is a schematic view of the installation of the spiral body and the spiral sweeper;
FIG. 5 is a schematic structural view of a stall warning mechanism;
FIG. 6 is a schematic structural view of a stall warning gear plate;
FIG. 7 is a schematic structural view of embodiment 2;
fig. 8 is a schematic view of a primary separation grid network.
In the figure: 1. the device comprises a slag-water separation tank, 2, a water pump, 3, a remote liquid level meter, 4, a feeding barrel, 5, a primary separation grid net, 6, a U-shaped tank, 7, a screw conveyor, 8, a spiral body, 9, an anti-collision cap, 10, a splash guard, 11, a supporting spring, 12, a spring sleeve, 13, a vibration motor, 14, a wear-resistant lining layer, 15, a grid net layer, 16, a black water collecting tank, 17, a planetary gear reducer, 18, a variable-frequency explosion-proof motor, 19, a secondary water collecting tank, 20, a secondary vibrating screen, 21, a vibrating screen support, 22, a stall alarm gear disc, 23, a stall alarm probe, 24, a spiral body cleaner, 25, an adjusting spring, 26, an inspection manhole, 27, a sewage discharge outlet, 28, a washing water pipeline, 29, a support frame, 30, a filtering grid net, 31, a separation plate, 32 and a filtering hole.
Detailed Description
The slag-water separation method for a gasification furnace according to the present invention will be described in detail below with reference to the drawings and specific examples.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description. And are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the invention relates to a slag-water separation method for a gasification furnace, which comprises the following steps:
s1, when the slag collecting time of the gasification furnace slag lock bucket reaches the preset time, slag begins to be discharged, and meanwhile, a washing water pipe of the gasification furnace slag lock bucket is opened for large-flow washing;
s2, enabling slag water discharged by the gasification furnace slag lock hopper to flow into the primary slag-water separation structure through the feeding cylinder 4 and the anti-collision cap;
s3, feeding the black water separated by the primary slag-water separation structure into a slag-water separation tank 1, conveying the slag separated by the primary slag-water separation structure into a secondary slag-water separation structure by a screw conveyor 7 for slag-water separation again, and conveying the separated slag with qualified water content to a storage yard by a belt;
s4, the ash water separated by the secondary slag-water separation structure enters a slag-water separation tank 1, a remote liquid level meter 3 is installed in the slag-water separation tank 1, and the water pump 2 is automatically started and stopped according to the liquid level to run, so that full-process automatic operation is realized.
As shown in the attached figure 1, a water pump 2 is arranged at one side of the bottom of a slag-water separation tank 1, and a remote liquid level meter 3 is arranged at the other side of the bottom of the slag-water separation tank 1; the bottom of the slag-water separation tank 1 is provided with an inspection manhole 26, and the outer side of the inspection manhole 26 is provided with two sewage outlets 27; a flushing water pipeline 28 is arranged on one side of the slag-water separation tank 1 away from the water pump 2, and the flushing water pipeline 28 is opened periodically to flush the accumulated slag at the bottom of the tank body; the volume of the slag-water separation tank 1 is not less than that of the gasification furnace slag lock hopper, so that the slag water is prevented from overflowing.
In this embodiment, the feeding cylinder 4 is installed above the slag-water separation tank 1, the splash guard 10 is installed at the lower end of the feeding cylinder 4, the splash guard 10 is in an inverted funnel shape, and the inverted funnel-shaped splash guard 10 is located above the primary separation grating net 5. The middle position installs one-level sediment water separation structure in the sediment water separation tank 1, and one-level sediment water separation structure is the funnel-shaped structure of compriseing four sides one-level separation grid net 5, and the volume of leaking hopper-shaped one-level sediment water separation structure is not less than the volume that gasifier slag lock was fought, guarantees that the sediment water is not excessive. A U-shaped groove 6 is arranged at the bottom of the funnel-shaped primary slag-water separation structure, as shown in figure 3, a spiral body 8 of a spiral conveyor 7 is arranged in the U-shaped groove 6, and the spiral body 8 is used for conveying coarse slag collected by the primary separation grid net 5; the inner side wall of the U-shaped groove 6 is provided with a wear-resistant lining layer 14, and the wear-resistant lining layer 14 is a wear-resistant layer made of wear-resistant alloy materials or ceramic wear-resistant materials. An anti-collision cap 9 is arranged above the U-shaped groove 6, the anti-collision cap 9 is in a herringbone shape, and the herringbone anti-collision cap 9 is positioned between the feeding cylinder 4 and the primary separation grid net 5. Four spring supporting assemblies are installed between the anti-collision cap 9 and the primary separation grid net 5 and comprise supporting springs 11 and spring sleeves 12, the spring sleeves 12 are sleeved outside the supporting springs 11, one ends of the supporting springs 11 are fixed on the anti-collision cap 9, and the other ends of the supporting springs 11 are fixed on the primary separation grid net 5. One side of the primary separation grid net 5, which is far away from the U-shaped groove 6, is provided with a vibration motor 13, and the vibration motor 13 is positioned on the lower side surface of the primary separation grid net 5 to prevent slag from accumulating and falling. A support frame 29 is arranged between the primary separation grid net 5 and the slag-water separation tank 1, one end of the support frame 29 is fixedly connected with the lower side surface of the primary separation grid net 5, and the other end of the support frame 29 is fixed at the bottom of the slag-water separation tank 1; the support frame 29 is made of i-steel and channel steel.
Wherein, the distance between the lower edge of the anti-collision cap 9 and the first-stage separation grid net 5 is designed according to specific load and is not a fixed value. Taking 1500 tons of gasification furnaces as an example, the total weight of slag and water for each time is about 90 tons, wherein the slag is about 20 tons, the distance is controlled to be 5-10cm, the furnace is adjustable according to the size of the furnace and the slag discharging amount, if a spiral conveyer is uniformly selected to be smaller, the distance can be controlled to be smaller, and if the spiral conveyer is selected to be larger, the distance is controlled to be larger. The slag is for concentrating the slag under the gasifier, fall on screw conveyer spirochaeta for avoiding 20 tons of material are concentrated, the anticollision cap has been set up, firstly, alleviateed the impact effect of slag-water to screw conveyer, secondly, through the pan feeding mouth size that forms between control anticollision cap and the one-level separation grid net control the conveying speed of sediment, leave sufficient time for the separation of black water, can also reduce screw conveyer's size simultaneously, change instantaneous transport into average transport, reduced screw conveyer's manufacturing cost.
As shown in fig. 2, in the embodiment, the spiral conveyor 7 adjusts the rotation speed of the spiral conveyor 7 through a planetary gear reducer 17 and a variable-frequency explosion-proof motor 18, a torque detection device is mounted on the variable-frequency explosion-proof motor 18, and an alarm or a stop is given when the torque of the torque detection device exceeds a set value so as to protect equipment; the method specifically comprises the following steps: judging through the current of the screw conveyor 7, when the normal working current of the variable-frequency explosion-proof motor 18 is 18A, and the loaded working current is not more than 20A, arranging an alarm device in the DCS, automatically alarming when the detected current is more than 20A, indicating that the system is abnormal, automatically stopping the system in a chain manner, and checking whether foreign object clamping equipment exists or not on site; a second-stage slag-water separation structure is arranged at the outlet end of the screw conveyor 7 and comprises a second-stage water collection tank 19, a second-stage vibrating screen 20 is arranged at the position, close to the upper part, in the middle of the second-stage water collection tank 19, the lower end of the second-stage water collection tank 19 is communicated with the slag-water separation tank 1 through a communicating pipe, and the angle of the communicating pipe is 20-40 degrees; two side walls of the secondary vibrating screen 20 are respectively provided with a vibrating screen bracket 21.
As shown in fig. 5 and 6, the screw conveyor 7 is further provided with a stall warning device, the stall warning device comprises a stall warning gear disc 22 and a stall warning probe 23 mounted on the stall warning gear disc 22, the stall warning gear disc 22 rotates synchronously with the main shaft of the screw conveyor 7, and the stall warning probe 23 monitors whether the stall warning gear disc 22 rotates:
if the stall alarm gear disc 22 stops rotating, the stall alarm probe 23 loses more than 10 seconds of signals simultaneously or the signals are continuously input for more than 10 seconds, an alarm fault is judged, the alarm signal interlocks the screw conveyor 7 to stop, and the accident is prevented from further expanding.
The spiral conveyor 7 adopts a shaft spiral body 8, a spiral body sweeper 24 is arranged on one side of the spiral body 8 close to the outlet end of the spiral conveyor 7, as shown in the attached figure 4, the distance between the spiral body sweeper 24 and the center of the spiral body 8 is 0-1mm, and the spiral body sweeper mainly prevents the spiral body 8 from carrying materials from being accumulated in a groove body to cause overcurrent of the spiral conveyor 7; the radian of the spiral blade sweeper 24 is consistent with that of the blade on the outer side of the spiral body 8, and the spiral blade sweeper 24 is connected with the blade on the outer side of the spiral body 8 through an adjusting spring 25, so that the cleaning device is ensured to be tightly attached to the spiral body 8 all the time; the spiral blade sweeper 24 is made of wear-resistant alloy, such as PTFE (polytetrafluoroethylene), and the thickness of the spiral blade sweeper 24 is 10-20 mm.
The slag-water separation method for the gasification furnace comprises the following specific processes:
(1) the slag water collected by the gasification furnace slag lock bucket is primarily separated by a primary separation grid net 5: the spiral conveyor 7 is arranged in a U-shaped groove 6 at the bottom of the primary slag-water separation structure, slag water falling into the primary slag-water separation structure is primarily separated through a primary separation grid net 5, black water enters the slag-water separation tank 1, a remote liquid level meter 3 is arranged in the slag-water separation tank 1, and the start and stop of the water pump 2 are directly interlocked through the high and low values of the liquid level, so that the liquid level in the slag-water separation tank 1 is controlled within an index range; the upper part of the central screw conveyer 7 at the bottom of the primary slag-water separation structure is provided with a herringbone anti-collision cap 9 made of wear-resistant materials, so that slag water is prevented from directly falling to scour the impeller of the screw conveyer 7, and meanwhile, the maximum load of the screw conveyer 7 can be controlled by controlling the distance between the anti-collision cap 9 and the primary separation grid net 5, so that the overload of the screw conveyer 7 caused by excessive blanking is prevented;
(2) and the separated coarse slag is left at the bottom of the primary slag-water separation structure and is conveyed to the secondary vibrating screen 20 through the screw conveyor 7 for slag-water separation again, black water collected at the lower part of the secondary vibrating screen 20 returns to the slag-water separation tank 1, and the separated slag with lower water content is loaded or conveyed to a storage yard for piling.
Example 2:
this example differs from example 1 only in that: as shown in fig. 7, the U-shaped groove 6 is a groove structure formed by a grid mesh layer 15 and a black water collecting tank 16 installed outside the grid mesh layer 15, and the black water collecting tank 16 is communicated with the slag-water separation tank 1. Other structures, positional relationships, and connection relationships are exactly the same as those in embodiment 1.
Example 3
This example differs from example 1 only in that: the primary separation grid net 5 is formed by splicing small grid nets with the same specification and fixedly spliced by bolts, so that the primary separation grid net is convenient to disassemble and assemble; in order to ensure the slag falling effect, the angle of the grating net on the primary separation grating net 5 is not less than 45 degrees. Other structures, positional relationships, and connection relationships are exactly the same as those in embodiment 1.
Example 4:
this example differs from example 1 only in that: the primary separation grid net 5 is a plate-shaped structure consisting of a plurality of stainless steel plates with the thickness of 1mm and the width of 30mm, and the distance between the stainless steel plates is 1-1.5 mm. Other structures, positional relationships, and connection relationships are exactly the same as those in embodiment 1.
Example 5:
this example differs from example 1 only in that: the primary separation grid net 5 is a plate-shaped structure consisting of a plurality of battens which are integrally formed by adopting a polyurethane material and have a distance of 1-1.5 mm. Other structures, positional relationships, and connection relationships are exactly the same as those in embodiment 1.
Example 6:
this example differs from example 1 only in that: the spiral body 8 is a shaftless spiral body, and a wear-resistant alloy layer is welded on the outer surface of the spiral body 8. Other structures, positional relationships, and connection relationships are exactly the same as those in embodiment 1.
Example 7:
this example differs from example 1 only in that: first-order separation grid net 5 is the filtration composed of filtration grid net 30 and separation plate 31, and filtration grid net 30 is close to U type groove 6 one side and sets up, and separation plate 31 is located crashproof cap 9 and follows the below down, has seted up the filtration hole 32 that a plurality of intervals set up on the separation plate 31, and the slope of filtration hole 32 for the horizontal direction upwards sets up and filters the contained angle of hole 32 and horizontal direction and be 30-60, preferred 45. Other structures, positional relationships, and connection relationships are exactly the same as those in embodiment 1.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A slag-water separation method for a gasification furnace is characterized by comprising the following steps:
s1, when the slag collecting time of the gasification slag lock bucket reaches the preset time, slag discharge is started, and meanwhile, a washing water pipe of the gasification slag lock bucket is opened for large-flow washing;
s2, enabling slag water discharged by the gasification furnace slag lock hopper to flow into the primary slag-water separation structure through the feeding barrel and the anti-collision cap;
s3, feeding the black water separated by the primary slag-water separation structure into a slag-water separation tank, conveying the slag separated by the primary slag-water separation structure into a secondary slag-water separation structure by a screw conveyor for slag-water separation again, and conveying the separated slag with qualified water content to a storage yard by a belt;
s4, the ash water separated by the secondary slag-water separation structure enters a slag-water separation tank, a remote liquid level meter is installed in the slag-water separation tank, and a water pump is automatically started and stopped to operate according to the liquid level, so that full-process automatic operation is realized;
wherein, the first-stage slag-water separation structure is a funnel-shaped structure consisting of at least four first-stage separation grid nets; the bottom of the funnel-shaped primary slag-water separation structure is provided with a U-shaped groove, a spiral body of a spiral conveyor is arranged in the U-shaped groove, and the spiral body is used for conveying coarse slag collected by the primary separation grid net;
a vibration motor is arranged on one side, away from the U-shaped groove, of the primary separation grid net and is positioned on the lower side surface of the primary separation grid net;
a support frame is arranged between the primary separation grid net and the slag-water separation tank, one end of the support frame is fixedly connected with the lower side surface of the primary separation grid net, and the other end of the support frame is fixed at the bottom of the slag-water separation tank; the support frame is made of I-shaped steel and channel steel;
the volume of the funnel-shaped primary slag-water separation structure is not less than that of the gasification furnace slag lock hopper;
the first-stage separation grid net is formed by splicing small grid nets with the same specification and fixedly spliced by bolts; the angle of the grating net on the primary separation grating net is not less than 45 degrees;
or the like, or, alternatively,
the primary separation grid net is of a plate-shaped structure consisting of a plurality of stainless steel plates with the distance of 1-1.5mm, the thickness of 1mm and the width of 30 mm;
or the like, or, alternatively,
the primary separation grid net is of a plate-shaped structure consisting of a plurality of integrally formed battens made of polyurethane materials with the interval of 1-1.5 mm;
or the like, or, alternatively,
the primary separation grating net is a filtering structure consisting of a filtering grating net and a separating plate, the filtering grating net is arranged close to one side of the U-shaped groove, the separating plate is positioned below the lower edge of the anti-collision cap, a plurality of filtering holes which are arranged at intervals are formed in the separating plate, the filtering holes are obliquely and upwards arranged relative to the horizontal direction, and the included angle between the filtering holes and the horizontal direction is 30-60 degrees;
the anti-collision cap is in a herringbone shape, at least four spring supporting assemblies are arranged between the herringbone anti-collision cap and the primary separation grid net, each spring supporting assembly comprises a supporting spring and a spring sleeve, the spring sleeves are sleeved on the outer sides of the supporting springs, one end of each supporting spring is fixed on the anti-collision cap, and the other end of each supporting spring is fixed on the primary separation grid net.
2. The slag-water separation method for the gasification furnace as claimed in claim 1, wherein a splash guard is provided at the lower end of the feed cylinder, the splash guard is in an inverted funnel shape, and the inverted funnel-shaped splash guard is positioned above the primary separation grid net.
3. The slag-water separation method for the gasification furnace according to claim 1, wherein a wear-resistant lining layer is arranged on the inner side wall of the U-shaped groove, and the wear-resistant lining layer is a wear-resistant layer made of a wear-resistant alloy material or a sprayed ceramic wear-resistant material;
or the like, or, alternatively,
the U-shaped groove is of a groove structure formed by a grid net layer and a black water collecting groove arranged on the outer side of the grid net layer, and the black water collecting groove is communicated with the slag-water separation groove.
4. The slag-water separation method for the gasification furnace according to claim 1, wherein the spiral conveyor adjusts the rotation speed of the spiral conveyor through a planetary gear reducer and a variable frequency explosion-proof motor, a torque detection device is installed on the variable frequency explosion-proof motor, and an alarm or a stop is given when the torque of the torque detection device exceeds a set value;
a second-stage slag-water separation structure is arranged at the outlet end of the screw conveyor and comprises a second-stage water collecting tank, a second-stage vibrating screen is arranged at the position close to the upper part of the middle part of the second-stage water collecting tank, and the lower end of the second-stage water collecting tank is communicated with the slag-water separation tank; two side walls of the secondary vibrating screen are respectively provided with a vibrating screen bracket;
still be provided with stall alarm device on the screw conveyer, stall alarm device includes stall warning toothed disc and installs the stall warning probe on stall warning toothed disc, stall warning toothed disc and screw conveyer synchronous revolution, whether stall warning probe monitoring stall warning toothed disc is rotatory:
if the stall alarm gear disc stops rotating, the stall alarm probe signal is lost for more than 10 seconds simultaneously or the signal is continuously input for more than 10 seconds, the alarm fault is judged, and the alarm signal interlocks the spiral conveyor to stop.
5. The slag-water separation method for the gasification furnace according to claim 1, wherein the spiral body is an axial spiral body or a shaftless spiral body, and a wear-resistant alloy layer is deposited on the outer surface of the spiral body;
a spiral body sweeper is arranged on one side of the spiral body close to the outlet end of the spiral conveyor, and the distance between the spiral body sweeper and the center of the spiral body is 0-1 mm; the radian of the spiral blade sweeper is consistent with that of the blade on the outer side of the spiral body, and the spiral blade sweeper is connected with the blade on the outer side of the spiral body through an adjusting spring; the spiral blade sweeper is made of wear-resistant alloy, and the thickness of the spiral blade sweeper is 10-20 mm.
6. The slag-water separation method for the gasification furnace as claimed in claim 1, wherein a manhole is arranged at the bottom of the slag-water separation tank, and a drain outlet is arranged outside the manhole;
a flushing water pipeline is arranged on one side of the slag-water separation tank away from the water pump;
the volume of the slag-water separation tank is not less than that of the gasification furnace slag lock hopper.
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