CN112538388A - High-quality coal gasification coarse slag treatment device and method - Google Patents
High-quality coal gasification coarse slag treatment device and method Download PDFInfo
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- CN112538388A CN112538388A CN202011296285.XA CN202011296285A CN112538388A CN 112538388 A CN112538388 A CN 112538388A CN 202011296285 A CN202011296285 A CN 202011296285A CN 112538388 A CN112538388 A CN 112538388A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/52—Ash-removing devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/01—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
- B01D33/03—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements
- B01D33/0346—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements
- B01D33/0353—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements self-supporting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/74—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging filtrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/80—Accessories
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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Abstract
The invention discloses a high-quality coal gasification coarse slag treatment device and method, and belongs to the technical field of coal water slurry gasification. The device for solving the technical problems is provided with an inclined dragveyer lifting section, a dragveyer discharging port is arranged on the dragveyer lifting section close to the lifting top end and is connected with one port of an electric discharging tee joint, one port of the other two ports is connected with an accident slag discharging pipe, a vibration dewatering screen is arranged below the other port, a water collecting tank is connected below the vibration dewatering screen, the side face of the water collecting tank is connected with the dragveyer lifting section through a return pipeline, and the side face of the vibration dewatering screen is connected with a dry material discharging hopper. After the technology of the invention is implemented, the content of black water in the slag is obviously reduced and is normally 10-15%, and the black water is not separated out after the vehicle is used for loading.
Description
Technical Field
The invention belongs to the technical field of coal water slurry gasification, and particularly relates to a high-quality coal gasification coarse slag treatment device and method.
Background
A conventional gasification device is designed with six gasification furnaces in a gasification process, and four gasification furnaces are provided in an operation mode. The operation mode of the existing gasification furnace is five, one is provided, the gasification furnace is a multi-nozzle opposed coal water slurry pressurized gasification furnace, the coal input amount of a single gasification furnace is 3000t/d, slag generated by the gasification furnace is discharged to a slag conveyor along with black water, the slag of the slag conveyor is conveyed to the head of the slag conveyor through a scraper blade of the slag conveyor, enters a transport vehicle through a hopper of the head and is transported outside the vehicle. 6 gasifier dragveyer, specification model: DLHL/GBL1.2X24, one gasification furnace corresponds to one slag dragging machine. The slag treatment capacity of the slag conveyor is designed to be 10-35t/h, and the water content is 50%. These slags are finely divided granular solids formed during coal gasification, the coal ash being quenched in water in the molten state.
1. Discharge data of slag conveyor
| Name (R) | Unit of | Minimum size | Is normal | Maximum of |
| Slag of furnace | kg/hr | 3840 | 12904 | 19356 |
| Black water | kg/hr | 3840 | 12904 | 19356 |
| Total flow rate | kg/hr | 7680 | 25808 | 38712 |
| Water content | wt％ | 50 | 50 | 50 |
2. Slag density and particle size
The true density of the slag is normally 2700kg/m3(ii) a Minimum 2240kg/m3Maximum 3200kg/m3The particle size distribution is as follows:
there are the following disadvantages:
a. the discharge process of the gasified slag is shown in the flow chart of figure 1:
the coal slurry is pressurized by a coal slurry feed pump and then is sent to a process burner of a gasification furnace, high-pressure oxygen from an air separation system is sent to the gasification furnace, partial oxidation reaction is carried out in a combustion chamber 1 of the gasification furnace, the generated slag enters a chilling chamber 2 of the gasification furnace through the lower part of the combustion chamber, the slag is periodically flushed into a slag pool 4 through a lock hopper 3 after water bath of the chilling chamber, and the slag collected in the slag pool 4 is fished out through a scraper slag salvaging machine and then is loaded into a slag car to be transported out.
b. The disadvantages are as follows: the slag collected in the slag pool 4 is fished out through the ascending section at the front part of the scraper slag conveyor, part of water is separated out in the ascending section and flows back to the slag pool, and the water content of the slag loaded into the slag car is still about 50 percent. After the gasified slag is loaded by a vehicle, black water in the slag is separated out, and the black water contains fine particle ash, so that the periphery of the slag conveyor is sanitary, the vehicle transportation route is polluted, and no successful case for solving the bottleneck defect exists in the industry, and the gasified slag becomes a chronic disease in the industry.
In the prior art, a coal gasification device normally produces 19.356t/h of coarse slag in a single gasification furnace with the coal input amount of 95-105t/h (dry basis) and a single gasification furnace, the water control of the lifting section of the existing slag dragging machine is not ideal, the water content of slag is 50 percent, and practice shows that the coarse slag contains a large amount of water and is not beneficial to transportation, and because the water content is high, black water is separated out after the slag dragging machine is loaded by a vehicle, and meanwhile, fine particle ash is carried out, so that the sanitation around the slag dragging machine is; the black water continuously drops in the transportation process of the vehicle, so that the sanitation of the transportation road surface is influenced, and the environmental sanitation is further influenced; black flying dust is left after the water drops on the road surface are evaporated, so that the environment is easily polluted; the high moisture content restricts the effective transportation amount; therefore, the water content in the slag needs to be further reduced, and technical innovation is necessary for fully improving the environmental sanitation of the slag dragging machine, recovering water resources, saving energy and reducing consumption.
Disclosure of Invention
Aiming at the defects, the invention provides a device and a method for efficiently removing water in gasified slag. The sanitation of the periphery and the transportation road of the slag conveyor is improved, the environmental pollution is avoided, the recovered waste water is returned to the system for reuse, and the water resource is saved.
The invention provides a high-quality coal gasification coarse slag treatment device, which is provided with an inclined slag conveyor lifting section, wherein a slag conveyor discharging port is arranged at the position, close to the lifting top end, of the slag conveyor lifting section, the slag conveyor discharging port is connected with one port of an electric discharging tee joint, the other two ports of the electric discharging tee joint are respectively connected with an accident slag discharge pipe and a vibrating dewatering screen, a screen mesh is arranged at the bottom of the vibrating dewatering screen, a water collecting tank is connected below the screen mesh, a water discharging port is arranged on the side face of the water collecting tank, the water discharging port is connected with the slag conveyor lifting section through a return pipeline, and the side face of the bottom of the vibrating dewatering screen is connected with a dry material discharging hopper.
Furthermore, in the technical scheme, the included angle between the lifting section of the slag conveyor and the ground is 45-60 degrees, and a conveyor belt is arranged in the lifting section of the slag conveyor and can convey the coal gasification coarse slag to a discharge hole of the slag conveyor.
Furthermore, in the above technical scheme, the electric blanking baffle is arranged at the discharge port of the slag conveyor, and the electric blanking baffle can be controlled to enable the coal gasification coarse slag to enter the vibration dewatering screen or the accident slag discharge pipe.
Furthermore, in the technical scheme, the screen at the bottom of the vibration dewatering screen and the surface of the treatment device, which is in contact with the coal gasification coarse slag, are made of anticorrosive materials.
Further, in the above technical scheme, the discharge hole faces the ground.
The invention also provides a method for treating the coal gasification coarse slag by using the device, which comprises the following steps:
a. conveying the gasified coarse slag in the slag-soil pool to a discharge port of the slag conveyor through a lifting section of the slag conveyor, arranging an electric blanking baffle at the discharge port of the slag conveyor, closing an accident slag discharge pipe by the electric blanking baffle during normal operation, allowing the gasified coarse slag to enter a vibration dewatering screen for dewatering, allowing the dewatered slag to fall into a slag conveying vehicle through a dry material discharge hopper for conveying away, and allowing black water to flow into a water collecting tank and be conveyed back to the lifting section of the slag conveyor through a return pipeline;
b. when the slag amount exceeds the maximum bearing capacity of the vibration dewatering screen or the vibration dewatering screen breaks down, controlling an electric blanking baffle to close a three-way pipeline on one side of the vibration dewatering screen, enabling coal gasification coarse slag which is not dewatered to fall into a slag transport vehicle through an accident slag discharge pipe and be transported to a slag soil pool, enabling black water in a water collection tank to enter a return pipeline through a water discharge port and further enter a lifting section of a slag conveyor;
c. when the slag conveying vehicle is switched, the slag conveyor needs to be stopped for a short time, and the return pipeline is flushed by clear water to prevent the pipeline from being blocked.
Further, in the above technical scheme, the aperture of the screen at the bottom of the vibrating dewatering screen is 0.35-0.45 mm.
Further, in the technical scheme, the maximum bearing capacity of the vibration dewatering screen is that the dry basis is more than or equal to 35 t/h.
The principle is as follows:
1. the discharge hole of the slag conveyor has the functions: the gasified slag sent by the slope section 8 of the slag conveyor turns, and falls to a vibrating screen or directly enters a slag pulling vehicle.
2. The electric discharging three-way function: the switching function is realized by changing the flowing direction of a medium, the switching function is executed through an electro-hydraulic push rod, and the direction is changed by changing the position of a valve clack of the electric tee joint; if the screen plate of the dewatering screen is replaced or the dewatering screen is maintained, the screen plate can be switched to another blanking port through the three-way switching valve.
3. Vibrating a dewatering screen: dewatering, concentrating the gasified slag by the vibration of the vibrating dewatering screen
4. A water collecting tank: and collecting the black water separated by the dewatering screen.
5. A dry material discharging hopper: the condensed and dehydrated gasified slag enters the automobile through the position.
6. A return line: and the black water collected by the water collecting tank flows back to the slag dragging machine automatically.
7. An accident slag discharge pipe: when the dehydration device has a fault, the gasified slag is sent to the car through the pipeline by changing the electric tee joint.
8. A slag conveyor lifting section: the gasified slag fished out by the slag dragging machine is lifted to the head of the slag dragging machine.
Has the advantages that:
(1) after the technology of the invention is implemented, the content of black water in the slag is obviously reduced and is normally 10-15%, and the black water is not separated out after the vehicle is used for loading.
(2) The sanitation of the ground surrounding the lower part of the machine head and the transportation road is improved, and the environmental pollution is avoided; and better social benefits are obtained.
(3) The screened black water is completely returned to the system for reuse, and compared with the prior art, 1742t of black water is recovered in 5 furnace operation days.
Drawings
Fig. 1 is a schematic view of a conventional apparatus.
FIG. 2 is a schematic view of the apparatus of the present invention.
The device comprises a gasification furnace combustion chamber 1, a gasification furnace chilling chamber 2, a lock hopper 3, a slag pool 4, a slag salvaging machine discharge port 5, an electric discharge tee joint 6, a vibration dewatering screen 7, a water collecting tank 8, a dry material discharge hopper 9, a return pipeline 10, an accident slag discharge pipe 11 and a slag salvaging machine lifting section 12.
Detailed Description
The following non-limiting examples will allow one of ordinary skill in the art to more fully understand the present invention, but are not intended to limit the invention in any way.
Example 1
The utility model provides a high quality coal gasification coarse slag processing apparatus, the device is equipped with the dragveyer promotion section 12 of slope, dragveyer promotion section 12 is close to and promotes the top and is equipped with dragveyer discharge gate 5, dragveyer discharge gate 5 links to each other with a mouthful of electronic tee bend 6 of unloading, two other mouths of electronic tee bend 6 of unloading link to each other with accident scum pipe 11 and vibration dewatering screen 7 respectively, vibration dewatering screen 7 bottom is equipped with the screen cloth, it has header tank 8 to link to each other below the screen cloth, header tank 8 side is equipped with the outlet, the outlet links to each other with dragveyer promotion section 12 through backflow pipeline 10, vibration dewatering screen 7 bottom side links to each other with dry charge discharge. The included angle between the lifting section 12 of the slag conveyor and the ground is 45-60 degrees, a conveyor belt is arranged in the lifting section 12 of the slag conveyor and can convey the coal gasification coarse slag to a discharge port 5 of the slag conveyor. An electric blanking baffle is arranged at the discharge hole of the slag conveyor 5 and can be controlled to enable the coal gasification coarse slag to enter the vibration dewatering screen 7 or the accident slag discharging pipe 11. The screen at the bottom of the vibrating dewatering screen 7 and the surface of the processing device which is contacted with the coal gasification coarse slag are made of anticorrosive materials. The discharge port 5 faces the ground.
Example 2
The method for treating the coal gasification coarse slag by the device comprises the following steps:
a. conveying the gasified coarse slag in the slag-soil pool to a discharge port 5 of the slag conveyor through a lifting section 12 of the slag conveyor, arranging an electric blanking baffle at the discharge port 5 of the slag conveyor, closing an accident slag discharge pipe 11 by the electric blanking baffle during normal operation, allowing the gasified coarse slag to enter a vibrating dewatering screen 7 for dewatering, allowing the dewatered slag to fall into a slag conveying vehicle through a dry material discharge hopper 9 for conveying away, allowing black water to flow into a water collecting tank 8, and conveying the black water back to the lifting section 12 of the slag conveyor through a return pipeline 10;
b. when the slag amount exceeds the maximum bearing capacity of the vibration dewatering screen or the vibration dewatering screen breaks down, controlling an electric blanking baffle to close a three-way pipeline on one side of the vibration dewatering screen 7, enabling non-dehydrated coal gasification coarse slag to fall into a slag transport vehicle through an accident slag discharge pipe 11 and be transported into a slag soil pool, enabling black water in a water collecting tank 8 to enter a return pipeline 10 through a water discharge port and further enter a dragveyer lifting section 12;
c. when the slag conveying vehicle is switched, the slag conveyor needs to be stopped for a short time, and the return pipeline 10 is flushed by clear water to prevent the pipeline from being blocked.
The aperture of the screen at the bottom of the vibration dewatering screen 7 is 0.35-0.45 mm.
The maximum bearing capacity of the vibration dewatering screen is that the dry basis is more than or equal to 35 t/h.
Example 3
1. Technical data table of the vibration dewatering screen:
a. the device name: vibrating dewatering screen
b. Treatment capacity: 35t/h dry basis
c. Quantity: 6 tables
d. Effective screening area: 1800mm 4200mm
e. The name of the screened material is: slag of gasification furnace
f. The material is as follows: Q235-B plate with thickness of 12mm
g. And (3) screening pore diameter: 1mm
h. Sieve plate: the stainless steel sieve plate is adopted, and the thickness is not less than 40mm (the material blockage is not easy to happen, the corrosion resistance is realized, the replacement is simple, and the wear resistance is high).
i. Inclination angle of the screen: 0 degree
j. Vibration direction: 45 degree
k. Amplitude: 6-11mm
Vibration frequency: 960r/min
2. The working principle of the vibration dewatering screen is as follows:
the vibrating dewatering screen adopts a unique vibrating motor, and the motion trail is more stable and reliable. When the two motors rotate in the same direction, the vibration forces generated by the eccentric blocks are offset in the direction parallel to the axes of the motors and are superposed into a resultant force in the direction perpendicular to the shafts of the motors, so that the motion trail of the screening machine is a straight line. The two shafts have an inclination angle in the vertical direction relative to the screen surface, and under the combined action of vibration force and material self-gravity, the material on the screen surface moves forward along a continuous jump. During the process of meeting the screen surface, the materials and water smaller than the screen holes penetrate through the screen surface, thereby realizing dehydration, desliming and classification.
3. The preferred mode is as follows:
a. the installation form of the screen plate of the vibration dewatering screen is as follows: the main part of the screen plate of the dewatering screen is inclined upwards in the horizontal direction, the rear part of the screen plate and the main plate form an angle of 45 degrees, the two balanced vibrating motors are horizontally arranged, one vibrating motor is arranged at the upper end of the other vibrating motor, the rotating effect generated by unbalanced gravity during rotation ensures that the dewatering screen can work stably, and the noise is reduced to the maximum extent. And, the screen cloth adopts embedded, is convenient for install and local change.
b. The configuration scheme of the dewatering screen for feeding and discharging, the baffle switching, the header tank for washing and draining is as follows: a large amount of lime-ash is carried to the vibration dewatering screen through the tee bend of unloading, can switch to another blanking mouth through the tee bend diverter valve when changing the sieve board or maintaining the dewatering screen like the dewatering screen. The three-way switching valve executes the switching function through the electro-hydraulic push rod. The ash residue is filtered for the second time by the screen plate of the dewatering screen, and the residual ash water is guided to the water collecting tank and then flows into the slag pool of the slag dragging machine through a pipeline. The water collecting tank is provided with a washing nozzle for back washing the adhering ash residue on the sieve plate and the wall of the water collecting tank.
c. The three-way switching valve does not drip when in normal use: when the tongue plate in the three-way switching valve is switched to move, the baffles at two sides are used for positioning and sealing, so that ash residues are prevented from dropping to the standby blanking port through the gap between the tongue plate and the three-way side plate and are more and more stored; the high-sealing gate valve is arranged at the spare blanking port of the three-way switching valve, and the sealing performance is good.
d. Explanation of mechanical self-locking device of blanking baffle actuating mechanism: the tongue plate in the three-way switching valve is pushed to operate through the electro-hydraulic push rod outside the shell, so that the phenomena of incomplete pushing and loosening of the push rod of the tongue plate are prevented, and a mechanical self-locking device is arranged on the side of an execution mechanism of the three-way valve to prevent the phenomena.
Example 4
An electric discharge tee joint 6 is arranged at a discharge port 5 of the slag conveyor, one path of the electric discharge tee joint enters a vibrating dewatering screen 7 for dewatering, and a dewatered dry material discharge hopper 5 falls into a slag transport vehicle; the other path is a fault slag discharge pipeline, and slag water which is not dehydrated falls into a slag transport vehicle through a fault slag discharge pipe 7. The maximum output of the vibration dewatering screen 7 is 35t/h (dry basis), and when the slag amount exceeds 35t/h (dry basis) or the vibration dewatering screen 7 breaks down, the electric blanking baffle is switched to the broken slag discharge pipeline 11. The water outlet of the vibration dewatering screen 7 is provided with a return pipeline 10 which returns the waste water to the position above the highest water level of the slag conveyor, and a lifting section 12 of the slag conveyor. The return line 10 is provided with flushing water to prevent clogging of the line. When the slag conveying vehicle is switched, the operation of the slag conveyor needs to be stopped for a short time.
The slag raw material slurry enters a vibration dewatering screen 7 for dewatering treatment, the width of a screen slot used by the vibration dewatering screen 7 is 0.42mm, and according to the corresponding particle size distribution, more than 0.3mm of particles approximately account for 70% of the total particle population, namely more than 70% of slag coarse-grained materials are reserved on the vibration dewatering screen 7 and are drained out in a dry mode. The residual fine-grained slag (about 25-30% of the total amount) is returned to the slag pool of the slag conveyor through a return line 10 along with the drainage.
The screen surface of the vibration dewatering screen 7 is made of stainless steel 304, the stainless steel 304 is paved on the lower discharge beam in sections and fastened by a special pin, and the assembly and the disassembly are very convenient
The foregoing examples are provided for illustration and description of the invention only and are not intended to limit the invention to the scope of the described examples. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed.
Claims (8)
1. The utility model provides a high quality coal gasification coarse slag processing apparatus, a serial communication port, the device is equipped with inclined dragveyer promotion section (12), dragveyer promotion section (12) are close to promote the top and are equipped with dragveyer discharge gate (5), dragveyer discharge gate (5) link to each other with an mouth of electronic tee bend (6) of unloading, two other mouths of electronic tee bend (6) link to each other with accident slag discharge pipe (11) and vibration dewatering screen (7) respectively, vibration dewatering screen (7) bottom is equipped with the screen cloth, the screen cloth below even has header tank (8), header tank (8) side is equipped with the outlet, the outlet links to each other with dragveyer promotion section (12) through return line (10), vibration dewatering screen (7) bottom side links to each other with dry charge play hopper (9).
2. The high-quality coal gasification coarse slag treatment device according to claim 1, wherein the included angle between the lifting section (12) of the slag conveyor and the ground is 45-60 degrees, and a conveyor belt is arranged inside the lifting section (12) of the slag conveyor and can convey the coal gasification coarse slag to the discharge hole (5) of the slag conveyor.
3. The high-quality coal gasification coarse slag processing device according to claim 1, characterized in that an electric blanking baffle is arranged at the discharge hole of the slag conveyor (5), and the electric blanking baffle can be controlled to make coal gasification coarse slag enter the vibration dewatering screen (7) or the accident slag discharging pipe (11).
4. The high-quality coal gasification coarse slag processing device according to claim 1, wherein the screen at the bottom of the vibrating dewatering screen (7) and the surface of the processing device which is in contact with the coal gasification coarse slag are made of anticorrosive materials.
5. A high quality coal gasification coarse slag processing apparatus according to claim 1, characterized in that the discharge port (5) faces the ground.
6. A method for treating coal gasification coarse slag by using the device of any one of claims 1-5, which is characterized by comprising the following steps:
a. conveying the gasified coarse slag in the slag-soil pool to a discharge port (5) of the slag conveyor through a lifting section (12) of the slag conveyor, arranging an electric blanking baffle at the discharge port (5) of the slag conveyor, closing an accident slag discharge pipe (11) by the electric blanking baffle during normal work, dewatering the gasified coarse slag in a vibrating dewatering screen (7), allowing the dewatered slag to fall into a slag conveying vehicle through a dry material discharge hopper (9) and conveying away, allowing black water to flow into a water collecting tank (8), and conveying the black water back to the lifting section (12) of the slag conveyor through a return pipeline (10);
b. when the slag amount exceeds the maximum bearing capacity of the vibration dewatering screen or the vibration dewatering screen breaks down, controlling an electric blanking baffle to close a three-way pipeline on one side of the vibration dewatering screen (7), enabling non-dehydrated coal gasification coarse slag to fall into a slag transport vehicle through an accident slag discharge pipe (11) and be transported into a slag-soil pool, and enabling black water in a water collecting tank (8) to enter a return pipeline (10) through a water discharge port and further enter a slag conveyor lifting section (12);
c. when the slag conveying vehicle is switched, the slag conveyor needs to be stopped for a short time, and the return pipeline (10) is flushed by clear water to prevent the pipeline from being blocked.
7. The method for treating the high-quality coal gasification coarse slag according to claim 6, wherein the mesh diameter of the bottom screen of the vibrating dewatering screen (7) is 0.35-0.45 mm.
8. The method for treating the high-quality coal gasification coarse slag according to claim 6, wherein the maximum bearing capacity of the vibration dewatering screen is more than or equal to 35t/h on a dry basis.
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| CN208809584U (en) * | 2018-06-26 | 2019-05-03 | 北京清创晋华科技有限公司 | A kind of thick slag drying process device |
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Application publication date: 20210323 |