CN110559721B - Coal gasification black water filter and filtering method - Google Patents
Coal gasification black water filter and filtering method Download PDFInfo
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- CN110559721B CN110559721B CN201911038269.8A CN201911038269A CN110559721B CN 110559721 B CN110559721 B CN 110559721B CN 201911038269 A CN201911038269 A CN 201911038269A CN 110559721 B CN110559721 B CN 110559721B
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- 239000010866 blackwater Substances 0.000 title claims abstract description 215
- 238000001914 filtration Methods 0.000 title claims abstract description 153
- 238000002309 gasification Methods 0.000 title claims abstract description 115
- 239000003245 coal Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011148 porous material Substances 0.000 claims abstract description 40
- 238000004140 cleaning Methods 0.000 claims abstract description 30
- 230000000903 blocking effect Effects 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 18
- 238000011010 flushing procedure Methods 0.000 claims description 13
- 239000010865 sewage Substances 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 5
- 239000013618 particulate matter Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/33—Self-supporting filtering elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
- B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
-
- 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
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/169—Integration of gasification processes with another plant or parts within the plant with water treatments
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention belongs to a coal gasification black water filter and a filtering method; comprises a filter shell, wherein a filtering internal piece is arranged in the filter shell; a gasified black water inlet pipeline with a water inlet valve is arranged on the filter shell corresponding to one side of the filtering internal part, and a gasified black water outlet pipeline with a water outlet valve is arranged on the filter shell corresponding to the upper part of the other side of the filtering internal part; the filter inner piece comprises an outer filter screen fixedly arranged in the filter shell and an inner filter screen which is attached to the inner side of the outer filter screen and can move; the filter pore diameter is flexibly adjusted according to working condition requirements by adopting a mode of combining the outer filter screen and the inner filter screen, the blocking condition is judged according to inlet and outlet pressure difference, the service life of the filter pore diameter is prolonged by adjusting, and the filter pore diameter is matched with an air cleaning device to realize the advantages of no disassembly, cleaning and reduction of labor intensity of personnel.
Description
Technical Field
The invention belongs to the technical field of coal gasification accessory parts, and particularly relates to a coal gasification black water filter and a filtering method.
Background
Black water is discharged liquid from a gasification furnace, a cyclone separator and a water scrubber of the coal gasification device, contains a large amount of solid particles, is very easy to cause blockage of pipelines and equipment, and can be recycled after being filtered.
At present, a black water filter is generally arranged on a black water pipeline, a filter screen of an internal part is a filter screen with a fixed size, the black water filter cannot be flexibly applied to the requirements of multiple working conditions, and when the black water filter is used, the blocking and scaling conditions of the filter are judged by arranging a differential pressure sensor at an inlet and an outlet of the black water filter. The black water contains a large amount of calcium and magnesium ions, so that the filter is easily blocked by scaling with solid particles, the inlet and outlet pressure difference is increased, the filtering effect and efficiency are reduced, and the water outlet flow cannot be improved when the blocking is serious; the problems of rising inlet and outlet pressure difference of the black water filter, blockage of the filter screen of the internal part and the like are solved only by means of disassembling, flushing, replacing the filter screen and the like at present, and the defects of frequent disassembly and high labor intensity of personnel exist.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a coal gasification black water filter and a filtering method which adopt a mode of combining an outer filter screen and an inner filter screen to flexibly adjust the filter aperture according to working condition requirements, judge the blocking condition according to inlet and outlet pressure difference, adjust the filter aperture to prolong the service cycle, and are matched with an air cleaning device to realize non-dismantling cleanable and reduce the labor intensity of personnel.
The purpose of the invention is realized in the following way: the filter comprises a filter shell, wherein a filter inner piece is arranged in the filter shell; a gasified black water inlet pipeline with a water inlet valve is arranged on the filter shell corresponding to one side of the filtering internal part, and a gasified black water outlet pipeline with a water outlet valve is arranged on the filter shell corresponding to the upper part of the other side of the filtering internal part; the filter internals include the fixed outer filter screen that sets up in the filter casing and laminating in outer filter screen inboard and can remove interior filter screen.
Further, the outer filter screen is of a cylinder structure with an opening at the upper part, and a baffle plate connected with the inner wall of the filter shell is arranged at the outer side of the upper part of the cylinder structure; the bottom plate is arranged at the inner bottom of the cylinder structure.
Further, the bottom plate is a blind plate or a screen plate; the ratio of the width of the baffle plate to the diameter of the outer filter screen is 1:3-4; the inner diameter of the outer filter screen is equal to the outer diameter of the inner filter screen; the thickness of the outer filter screen is consistent with that of the inner filter screen, and the thickness of the outer filter screen is 2-5 mm.
Further, the aperture of the filter holes at the upper part of the outer filter screen is consistent with that of the filter holes of the inner filter screen, the aperture of the filter holes in the inner filter screen is 8-10 mm, the interval between two adjacent rows of filter holes is 8-10 mm, and the aperture of the filter holes in the two rows at the lowest part of the outer filter screen is 3-5 mm.
Further, the sieve pore diameter of the sieve plate is smaller than the pore diameter of the filter pore of the inner filter screen.
Further, the top height of the outer filter screen is the same as that of the baffle, and the top height of the inner filter screen is 8-10 mm greater than that of the baffle.
Further, the inner filter screen is a cylinder unit with an opening at the upper part and the lower part, a plurality of supporting rods are arranged on the inner wall of the cylinder unit, and the supporting rods are respectively connected with a lifting rod arranged in the middle part of the inside of the cylinder unit through corresponding cross rods; the top of the lifting rod passes through the top of the filter shell and is connected with a hand wheel arranged outside the filter shell; a sealing filler layer is arranged between the filter shell and the lifting rod, and a sealing bolt matched with the filter shell is arranged at the upper part of the sealing filler layer.
Further, the number of the cross bars is four, and the included angle between every two adjacent cross bars is 90 degrees; the upper part of the lifting rod is provided with scales.
Further, a tee joint is arranged on the gasified black water outlet pipeline between the water outlet valve and the filter shell, an air inlet pipeline with an air inlet valve is arranged at the third end of the tee joint, an exhaust pipeline with an air outlet valve is arranged on the filter shell at the lower part of the gasified black water inlet pipeline, and a sewage pipeline with a sewage valve is arranged at the bottom of the filter shell; the pipe diameter of the gasification black water inlet pipe is the same as that of the gasification black water outlet pipe;
further, the top of the filter shell is provided with a flange plate, and the top of the filter shell is connected with the flange plate through bolts.
A filtration method of a coal gasification black water filter, the filtration method comprising the steps of:
step 1: when the coal gasification black water filtering stage is performed, the air inlet valve, the air outlet valve and the blow-down valve are closed, and the coal gasification black water enters the filter shell through the water inlet valve and is discharged out of the filter shell through the filtering internal part and the water outlet valve; the coal gasification black water filtering stage comprises a filtering initial stage, a filtering operation stage and a filtering final stage;
step 2: the scale on the lifting rod is 0-10 mm, the scale on the lifting rod is 0 in the initial state, the filter holes in the outer filter screen and the inner filter screen are not overlapped at all, and the filter holes on the outer filter screen are blocked by the inner filter screen; when the filter is in the initial stage of filtration, the lifting rod is controlled by the hand wheel to lift, so that the scale on the lifting rod is displayed as 3 mm, the filter holes in the outer filter screen and the inner filter screen are partially overlapped at the moment, the aperture area of the filter holes is V1, and the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 10-15 kpa at the moment;
step 3: the coal gasification black water continuously enters the filter shell, the filtering holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 100-110 kpa, the lifting rod is controlled by the hand wheel to lift, the scale on the lifting rod is displayed as 8 mm, at the moment, the filtering holes in the outer filtering net and the inner filtering net are partially overlapped in the filtering running stage, the aperture area of the filtering holes is V2, and V2 is larger than V1; flushing the blockage under the action of coal gasification black water pressure, and enlarging the area of V2 to change the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline into 10-20 kpa;
step 4: the coal gasification black water continuously enters the filter shell, the filter holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 100-110 kpa, the lifting rod is controlled by the hand wheel to lift, the scale on the lifting rod is displayed as 10mm, at the final stage of filtering, the filter holes in the outer filter screen and the inner filter screen are completely overlapped, and under the action of the coal gasification black water pressure, the blocking object is punched out and the filter holes are completely opened, so that the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is changed to 10-20 kpa;
step 5: continuously feeding coal gasification black water into the filter shell, and judging that the filter holes are blocked when the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 100-110 kpa; at this time, a cleaning state is entered;
step 6: when the cleaning state is entered, the water inlet valve and the water outlet valve are closed, the air inlet valve, the air outlet valve and the sewage discharging valve are opened, and the scale on the lifting rod is displayed as 10mm; residual black water and solid particles in the filter shell are discharged through a blow-down valve;
step 7: closing the blow-down valve, and introducing compressed air of 1.0-3.0Mpa into the air inlet pipeline with the air inlet valve, wherein the compressed air passes through the fully overlapped filter holes and is discharged through the air outlet valve; the particulate matters blocking the filter holes in the flushing process of the compressed air are flushed into the bottom of the filter shell; the flow rate of the compressed air is 200-300 m/min;
step 8: the time of introducing compressed air in the step 7 is 5min; the compressed air is introduced for 4-6 times in each cleaning period;
step 9: after the cleaning period in the step 8 is finished, opening a blow-down valve to discharge solid particles or scale sheets remained in the filter shell;
step 10: and (3) after the solid particles or scale flakes remained in the filter shell are discharged in the step (9), closing a blow-down valve, and repeating the steps (2) to (5) to continuously filter the coal gasification black water.
According to the invention, the filtering aperture is flexibly adjusted according to working condition requirements by adopting a mode of combining the outer filter screen and the inner filter screen, the blocking condition is judged according to the inlet-outlet pressure difference, the service life of the filtering aperture is prolonged by adjusting the filtering aperture, and the air cleaning device is matched to realize the advantages of no disassembly, cleaning and labor intensity reduction of personnel.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a partial enlarged view of the portion a in fig. 1.
Fig. 3 is a schematic diagram of the positional connection relationship of the lifting rod, the cross rod and the supporting rod according to the present invention.
Fig. 4 is a schematic structural view of the outer filter and the inner filter of the present invention.
FIG. 5 is a diagram showing the filter holes at the initial stage of the filtration according to the first embodiment of the present invention.
FIG. 6 is a schematic diagram of a filter timing hole in a filter operation stage according to a first embodiment of the present invention.
Detailed Description
For a clearer understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals refer to like parts throughout the various views. For simplicity of the drawing, only the parts relevant to the invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product.
As shown in fig. 1, 2, 3 and 4, the invention is a coal gasification black water filter and a filtering method, the filter comprises a filter shell 12, and a filtering internal part is arranged in the filter shell 12; the filter shell 12 corresponding to one side of the filtering internal piece is provided with a gasified black water inlet pipeline with a water inlet valve 4, and the filter shell 12 corresponding to the upper part of the other side of the filtering internal piece is provided with a gasified black water outlet pipeline with a water outlet valve 9; the filter internals include an outer filter screen 11 fixedly arranged in a filter housing 12, and an inner filter screen 13 attached to the inner side of the outer filter screen 11 and movable.
Further, the outer filter screen 11 is a cylinder structure with an opening at the upper part, and a baffle plate 10 connected with the inner wall of the filter shell 12 is arranged at the outer side of the upper part of the cylinder structure; the bottom plate 17 is arranged at the inner bottom of the cylinder structure.
Further, the bottom plate 17 is a blind plate or a screen plate; the ratio of the width of the baffle 10 to the diameter of the outer filter screen 11 is 1:3-4; the inner diameter of the outer filter screen 11 is equal to the outer diameter of the inner filter screen 13; the thickness of the outer filter screen 11 is consistent with that of the inner filter screen 13, and the thickness of the outer filter screen 11 is 2-5 mm.
Further, the pore diameter of the filtering holes at the upper part of the outer filter screen 11 is consistent with the pore diameter of the filtering holes of the inner filter screen 13, the pore diameter of the filtering holes in the inner filter screen 13 is 8-10 mm, the interval between two adjacent rows of filtering holes is 8-10 mm, and the pore diameters of the filtering holes at the two lowest rows of the outer filter screen 11 are 3-5 mm.
Further, the sieve pore diameter of the sieve plate is smaller than the pore diameter of the inner filter screen 13.
Further, the top height of the outer filter screen 11 is the same as the top height of the baffle 10, and the top height of the inner filter screen 13 is 8-10 mm greater than the top height of the baffle 10.
Further, the inner filter screen 13 is a cylinder unit with an opening at the upper part and the lower part, the inner wall of the cylinder unit is provided with a plurality of supporting rods 15, and the plurality of supporting rods 15 are respectively connected with the lifting rod 1 arranged at the middle part inside the cylinder unit through corresponding cross rods 16; the top of the lifting rod 1 passes through the top of the filter shell 12 and is connected with a hand wheel 6 arranged outside the filter shell 12; a sealing filler layer 7 is arranged between the filter shell 12 and the lifting rod 1, and a sealing bolt 2 matched with the filter shell 12 is arranged at the upper part of the sealing filler layer 7.
Further, the number of the cross bars 16 is four, and the included angle between the adjacent cross bars 16 is 90 degrees; the upper part of the lifting rod 1 is provided with a scale 18.
Further, a tee joint 19 is arranged on the gasified black water outlet pipeline between the water outlet valve 9 and the filter shell 12, an air inlet pipeline with an air inlet valve 8 is arranged at the third end of the tee joint 19, an exhaust pipeline with an air outlet valve 5 is arranged on the filter shell 12 at the lower part of the gasified black water inlet pipeline, and a sewage pipeline with a sewage valve 14 is arranged at the bottom of the filter shell 12; the pipe diameter of the gasification black water inlet pipe is the same as that of the gasification black water outlet pipe; the top of the filter shell 12 is provided with a flange plate 3, and the top of the filter shell 12 is connected with the flange plate 3 through bolts.
A filtration method of a coal gasification black water filter comprises the following steps:
step 1: when the coal gasification black water filtering stage is performed, the air inlet valve 8, the air outlet valve 5 and the blow-off valve 14 are closed, the coal gasification black water enters the filter shell 12 through the water inlet valve 4, and is discharged out of the filter shell 12 through the filtering internal parts and the water outlet valve 9; the coal gasification black water filtering stage comprises a filtering initial stage, a filtering operation stage and a filtering final stage;
step 2: the scale on the lifting rod 1 is 0-10 mm, the scale on the lifting rod 1 is 0 in the initial state, the filter holes in the outer filter screen 11 and the inner filter screen 13 are not overlapped at all, and the filter holes on the outer filter screen 11 are blocked by the inner filter screen 13; when the filter is in the initial stage, the lifting rod 1 is controlled by the hand wheel 6 to lift, so that the scale on the lifting rod 1 is displayed as 3 mm, the filter holes in the outer filter screen 11 and the inner filter screen 13 are partially overlapped, the aperture area of the filter holes is V1, and the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 10-15 kpa;
step 3: the gasified black water continuously enters the filter shell 12, the filtering holes are blocked after the operation for a period of time, when the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 100-110 kpa, the lifting rod 1 is controlled by the hand wheel 6 to lift, the scale on the lifting rod 1 is displayed as 8 mm, at the moment, the filtering holes in the outer filter screen 11 and the inner filter screen 13 are partially overlapped in the filtering operation stage, the aperture area of the filtering holes is V2, and V2 is larger than V1; flushing the blockage under the action of coal gasification black water pressure, and enlarging the area of V2 to change the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline into 10-20 kpa;
step 4: the coal gasification black water continuously enters the filter shell 12, the filter holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 100-110 kpa, the lifting rod 1 is controlled by the hand wheel 6 to lift, the scale on the lifting rod 1 is displayed as 10mm, at the final stage of filtration, the filter holes in the outer filter screen 11 and the inner filter screen 13 are completely overlapped, and under the condition that the blocking object is punched out and the filter holes are completely opened under the action of the coal gasification black water pressure, the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is changed to 10-20 kpa;
step 5: continuously introducing coal gasification black water into the filter shell 12, and judging that the filter holes are blocked when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 100-110 kpa; at this time, a cleaning state is entered;
step 6: when the cleaning state is entered, the water inlet valve 4 and the water outlet valve 9 are closed, the air inlet valve 8, the air outlet valve 5 and the blow-off valve 14 are opened, and the scale on the lifting rod 1 is displayed as 10mm; the residual black water and solid particles in the filter shell 12 are discharged through a blow-down valve 14;
step 7: closing the blow-down valve 14, and introducing compressed air of 1.0-3.0Mpa into the air inlet pipeline with the air inlet valve 8, wherein the compressed air passes through the fully overlapped filter holes and is discharged through the air outlet valve 5; the particulate matter clogged in the filter holes during the above-mentioned compressed air flushing process is flushed into the bottom of the filter housing 12; the flow rate of the compressed air is 200-300 m/min;
step 8: the time of introducing compressed air in the step 7 is 5min; the compressed air is introduced for 4-6 times in each cleaning period;
step 9: after the cleaning cycle in the step 8 is finished, opening the blow-down valve 14 to discharge the solid particles or scale remained in the filter shell 12;
step 10: after the solid particles or scales remained in the filter housing 12 are discharged in the step 9, the blow-down valve 14 is closed, and the steps 2 to 5 are repeated to continuously filter the coal gasification black water.
The invention will now be further illustrated with reference to examples for a more detailed explanation of the invention. Specific examples are as follows:
example 1
A coal gasification black water filter, which comprises a filter shell 12, wherein a filtering internal part is arranged inside the filter shell 12; the filter shell 12 corresponding to one side of the filtering internal piece is provided with a gasified black water inlet pipeline with a water inlet valve 4, and the filter shell 12 corresponding to the upper part of the other side of the filtering internal piece is provided with a gasified black water outlet pipeline with a water outlet valve 9; the filter internals include an outer filter screen 11 fixedly arranged in a filter housing 12, and an inner filter screen 13 attached to the inner side of the outer filter screen 11 and movable. The outer filter screen 11 is of a cylindrical structure with an opening at the upper part, and a baffle plate 10 connected with the inner wall of the filter shell 12 is arranged at the outer side of the upper part of the cylindrical structure; the bottom plate 17 is arranged at the inner bottom of the cylinder structure. The bottom plate 17 is a blind plate or a screen plate; the ratio of the width of the baffle 10 to the diameter of the outer filter screen 11 is 1:3; the inner diameter of the outer filter screen 11 is equal to the outer diameter of the inner filter screen 13; the thickness of the outer filter screen 11 is consistent with that of the inner filter screen 13, and the thickness of the outer filter screen 11 is 2-5 mm. The pore diameter of the filtering holes at the upper part of the outer filter screen 11 is consistent with the pore diameter of the filtering holes of the inner filter screen 13, the pore diameter of the filtering holes in the inner filter screen 13 is 8-10 mm, the interval between two adjacent rows of filtering holes is 8-10 mm, and the pore diameters of the filtering holes at the two lowest rows of the outer filter screen 11 are 3-5 mm. The sieve pore diameter of the sieve plate is smaller than the pore diameter of the filter pore of the inner filter screen 13. The top height of the outer filter screen 11 is the same as that of the baffle 10, and the top height of the inner filter screen 13 is 8-10 mm greater than that of the baffle 10. The inner filter screen 13 is a cylinder unit with an opening at the upper part and the lower part, a plurality of supporting rods 15 are arranged on the inner wall of the cylinder unit, and the plurality of supporting rods 15 are respectively connected with the lifting rod 1 arranged in the middle part inside the cylinder unit through corresponding cross rods 16; the top of the lifting rod 1 passes through the top of the filter shell 12 and is connected with a hand wheel 6 arranged outside the filter shell 12; a sealing filler layer 7 is arranged between the filter shell 12 and the lifting rod 1, and a sealing bolt 2 matched with the filter shell 12 is arranged at the upper part of the sealing filler layer 7. The number of the cross bars 16 is four, and the included angle between every two adjacent cross bars 16 is 90 degrees; the upper part of the lifting rod 1 is provided with a scale 18. A tee joint 19 is arranged on the gasified black water outlet pipeline between the water outlet valve 9 and the filter shell 12, an air inlet pipeline with an air inlet valve 8 is arranged at the third end of the tee joint 19, an exhaust pipeline with an air outlet valve 5 is arranged on the filter shell 12 at the lower part of the gasified black water inlet pipeline, and a sewage pipeline with a sewage valve 14 is arranged at the bottom of the filter shell 12; the pipe diameter of the gasification black water inlet pipe is the same as that of the gasification black water outlet pipe; the top of the filter shell 12 is provided with a flange plate 3, and the top of the filter shell 12 is connected with the flange plate 3 through bolts.
A filtration method of a coal gasification black water filter comprises the following steps:
step 1: when the coal gasification black water filtering stage is performed, the air inlet valve 8, the air outlet valve 5 and the blow-off valve 14 are closed, the coal gasification black water enters the filter shell 12 through the water inlet valve 4, and is discharged out of the filter shell 12 through the filtering internal parts and the water outlet valve 9; the coal gasification black water filtering stage comprises a filtering initial stage, a filtering operation stage and a filtering final stage;
step 2: the scale on the lifting rod 1 is 0-10 mm, the scale on the lifting rod 1 is 0 in the initial state, the filter holes in the outer filter screen 11 and the inner filter screen 13 are not overlapped at all, and the filter holes on the outer filter screen 11 are blocked by the inner filter screen 13; as shown in fig. 5, when the filter is in the initial stage, the lifting rod 1 is controlled to lift by the hand wheel 6, so that the scale on the lifting rod 1 is displayed as 3 mm, at the moment, the filter holes in the outer filter screen 11 and the inner filter screen 13 are partially overlapped, the aperture area of the filter holes is V1, and at the moment, the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 10kpa;
step 3: the gasified black water continuously enters the filter shell 12, the filtering holes are blocked after the operation for a period of time, when the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 100kpa, the lifting rod 1 is controlled by the hand wheel 6 to lift, the scale on the lifting rod 1 is displayed as 8 mm, as shown in fig. 6, at the moment, the filtering holes in the outer filtering net 11 and the inner filtering net 13 are partially overlapped in the filtering operation stage, the aperture area of the filtering holes is V2, and V2 is larger than V1; flushing the blockage under the action of coal gasification black water pressure, and enlarging the area of V2 to change the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline into 10kpa;
step 4: the coal gasification black water continuously enters the filter shell 12, the filter holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 100kpa, the lifting rod 1 is controlled by the hand wheel 6 to lift, the scale on the lifting rod 1 is displayed as 10mm, the filter holes in the outer filter screen 11 and the inner filter screen 13 are completely overlapped at the final stage of filtering, and under the condition that the blocking object is flushed and the filter holes are completely opened under the action of the coal gasification black water pressure, the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is changed into 10kpa;
step 5: the gasified black water continuously enters the filter shell 12, and when the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 100kpa, the blockage of the filter holes can be judged; at this time, a cleaning state is entered;
step 6: when the cleaning state is entered, the water inlet valve 4 and the water outlet valve 9 are closed, the air inlet valve 8, the air outlet valve 5 and the blow-off valve 14 are opened, and the scale on the lifting rod 1 is displayed as 10mm; the residual black water and solid particles in the filter shell 12 are discharged through a blow-down valve 14;
step 7: closing the blow-off valve 14 and introducing 1.0Mpa of compressed air into the inlet duct with the inlet valve 8, the compressed air passing through the fully overlapped filter holes and being discharged through the outlet valve 5; the particulate matter clogged in the filter holes during the above-mentioned compressed air flushing process is flushed into the bottom of the filter housing 12; the flow rate of the compressed air is 200 m/min;
step 8: the time of introducing compressed air in the step 7 is 5min; the number of times of compressed air is introduced into each cleaning period is 4;
step 9: after the cleaning cycle in the step 8 is finished, opening the blow-down valve 14 to discharge the solid particles or scale remained in the filter shell 12;
step 10: after the solid particles or scales remained in the filter housing 12 are discharged in the step 9, the blow-down valve 14 is closed, and the steps 2 to 5 are repeated to continuously filter the coal gasification black water.
Example two
A coal gasification black water filter, which comprises a filter shell 12, wherein a filtering internal part is arranged inside the filter shell 12; the filter shell 12 corresponding to one side of the filtering internal piece is provided with a gasified black water inlet pipeline with a water inlet valve 4, and the filter shell 12 corresponding to the upper part of the other side of the filtering internal piece is provided with a gasified black water outlet pipeline with a water outlet valve 9; the filter internals include an outer filter screen 11 fixedly arranged in a filter housing 12, and an inner filter screen 13 attached to the inner side of the outer filter screen 11 and movable. The outer filter screen 11 is of a cylindrical structure with an opening at the upper part, and a baffle plate 10 connected with the inner wall of the filter shell 12 is arranged at the outer side of the upper part of the cylindrical structure; the bottom plate 17 is arranged at the inner bottom of the cylinder structure. The bottom plate 17 is a blind plate or a screen plate; the ratio of the width of the baffle 10 to the diameter of the outer filter screen 11 is 1:4; the inner diameter of the outer filter screen 11 is equal to the outer diameter of the inner filter screen 13; the thickness of the outer filter screen 11 is consistent with that of the inner filter screen 13, and the thickness of the outer filter screen 11 is 2-5 mm. The pore diameter of the filtering holes at the upper part of the outer filter screen 11 is consistent with the pore diameter of the filtering holes in the inner filter screen 13, the pore diameter of the filtering holes of the inner filter screen 13 is 8-10 mm, the interval between two adjacent rows of filtering holes is 8-10 mm, and the pore diameters of the filtering holes of the two rows at the lowest part of the outer filter screen 11 are 3-5 mm. The sieve pore diameter of the sieve plate is smaller than the pore diameter of the filter pore of the inner filter screen 13. The top height of the outer filter screen 11 is the same as that of the baffle 10, and the top height of the inner filter screen 13 is 8-10 mm greater than that of the baffle 10. The inner filter screen 13 is a cylinder unit with an opening at the upper part and the lower part, a plurality of supporting rods 15 are arranged on the inner wall of the cylinder unit, and the plurality of supporting rods 15 are respectively connected with the lifting rod 1 arranged in the middle part inside the cylinder unit through corresponding cross rods 16; the top of the lifting rod 1 passes through the top of the filter shell 12 and is connected with a hand wheel 6 arranged outside the filter shell 12; a sealing filler layer 7 is arranged between the filter shell 12 and the lifting rod 1, and a sealing bolt 2 matched with the filter shell 12 is arranged at the upper part of the sealing filler layer 7. The number of the cross bars 16 is four, and the included angle between every two adjacent cross bars 16 is 90 degrees; the upper part of the lifting rod 1 is provided with a scale 18. A tee joint 19 is arranged on the gasified black water outlet pipeline between the water outlet valve 9 and the filter shell 12, an air inlet pipeline with an air inlet valve 8 is arranged at the third end of the tee joint 19, an exhaust pipeline with an air outlet valve 5 is arranged on the filter shell 12 at the lower part of the gasified black water inlet pipeline, and a sewage pipeline with a sewage valve 14 is arranged at the bottom of the filter shell 12; the pipe diameter of the gasification black water inlet pipe is the same as that of the gasification black water outlet pipe; the top of the filter shell 12 is provided with a flange plate 3, and the top of the filter shell 12 is connected with the flange plate 3 through bolts.
A filtration method of a coal gasification black water filter comprises the following steps:
step 1: when the coal gasification black water filtering stage is performed, the air inlet valve 8, the air outlet valve 5 and the blow-off valve 14 are closed, the coal gasification black water enters the filter shell 12 through the water inlet valve 4, and is discharged out of the filter shell 12 through the filtering internal parts and the water outlet valve 9; the coal gasification black water filtering stage comprises a filtering initial stage, a filtering operation stage and a filtering final stage;
step 2: the scale on the lifting rod 1 is 0-10 mm, the scale on the lifting rod 1 is 0 in the initial state, the filter holes in the outer filter screen 11 and the inner filter screen 13 are not overlapped at all, and the filter holes on the outer filter screen 11 are blocked by the inner filter screen 13; when the filter is in the initial stage, the lifting rod 1 is controlled by the hand wheel 6 to lift, so that the scale on the lifting rod 1 is displayed as 3 mm, the filter holes in the outer filter screen 11 and the inner filter screen 13 are partially overlapped, the aperture area of the filter holes is V1, and the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 15kpa;
step 3: the gasified black water continuously enters the filter shell 12, the filtering holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 110kpa, the lifting rod 1 is controlled by the hand wheel 6 to lift, the scale on the lifting rod 1 is displayed as 8 mm, at the moment, the coal gasification black water is in the filtering running stage, the filtering holes in the outer filtering net 11 and the inner filtering net 13 are partially overlapped, the aperture area of the filtering holes is V2, and V2 is larger than V1; flushing the blockage under the action of coal gasification black water pressure, and enlarging the area of V2 to change the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline into 20kpa;
step 4: the coal gasification black water continuously enters the filter shell 12, the filter holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 110kpa, the lifting rod 1 is controlled by the hand wheel 6 to lift, the scale on the lifting rod 1 is displayed as 10mm, the filter holes in the outer filter screen 11 and the inner filter screen 13 are completely overlapped at the final stage of filtering, and under the condition that the blocking object is flushed and the filter holes are completely opened under the action of the coal gasification black water pressure, the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is changed to 20kpa;
step 5: the gasified black water continuously enters the filter shell 12, and when the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 110kpa, the blockage of the filter holes can be judged; at this time, a cleaning state is entered;
step 6: when the cleaning state is entered, the water inlet valve 4 and the water outlet valve 9 are closed, the air inlet valve 8, the air outlet valve 5 and the blow-off valve 14 are opened, and the scale on the lifting rod 1 is displayed as 10mm; the residual black water and solid particles in the filter shell 12 are discharged through a blow-down valve 14;
step 7: closing the blow-off valve 14 and introducing 3.0Mpa of compressed air into the inlet duct with the inlet valve 8, the compressed air passing through the fully overlapped filter holes and being discharged through the outlet valve 5; the particulate matter clogged in the filter holes during the above-mentioned compressed air flushing process is flushed into the bottom of the filter housing 12; the flow rate of the compressed air is 300 m/min;
step 8: the time of introducing compressed air in the step 7 is 5min; the number of times of compressed air is introduced into each cleaning period is 6;
step 9: after the cleaning cycle in the step 8 is finished, opening the blow-down valve 14 to discharge the solid particles or scale remained in the filter shell 12;
step 10: after the solid particles or scales remained in the filter housing 12 are discharged in the step 9, the blow-down valve 14 is closed, and the steps 2 to 5 are repeated to continuously filter the coal gasification black water.
Example III
A coal gasification black water filter, which comprises a filter shell 12, wherein a filtering internal part is arranged inside the filter shell 12; the filter shell 12 corresponding to one side of the filtering internal piece is provided with a gasified black water inlet pipeline with a water inlet valve 4, and the filter shell 12 corresponding to the upper part of the other side of the filtering internal piece is provided with a gasified black water outlet pipeline with a water outlet valve 9; the filter internals include an outer filter screen 11 fixedly arranged in a filter housing 12, and an inner filter screen 13 attached to the inner side of the outer filter screen 11 and movable. The outer filter screen 11 is of a cylindrical structure with an opening at the upper part, and a baffle plate 10 connected with the inner wall of the filter shell 12 is arranged at the outer side of the upper part of the cylindrical structure; the bottom plate 17 is arranged at the inner bottom of the cylinder structure. The bottom plate 17 is a blind plate or a screen plate; the ratio of the width of the baffle 10 to the diameter of the outer filter screen 11 is 1:3.5; the inner diameter of the outer filter screen 11 is equal to the outer diameter of the inner filter screen 13; the thickness of the outer filter screen 11 is consistent with that of the inner filter screen 13, and the thickness of the outer filter screen 11 is 2-5 mm. The pore diameter of the filtering holes at the upper part of the outer filter screen 11 is consistent with the pore diameter of the filtering holes of the inner filter screen 13, the pore diameter of the filtering holes of the inner filter screen 13 is 8-10 mm, the interval between two adjacent rows of filtering holes is 8-10 mm, and the pore diameters of the filtering holes of the two rows at the lowest part of the outer filter screen 11 are 3-5 mm. The sieve pore diameter of the sieve plate is smaller than the pore diameter of the filter pore of the inner filter screen 13. The top height of the outer filter screen 11 is the same as that of the baffle 10, and the top height of the inner filter screen 13 is 8-10 mm greater than that of the baffle 10. The inner filter screen 13 is a cylinder unit with an opening at the upper part and the lower part, a plurality of supporting rods 15 are arranged on the inner wall of the cylinder unit, and the plurality of supporting rods 15 are respectively connected with the lifting rod 1 arranged in the middle part inside the cylinder unit through corresponding cross rods 16; the top of the lifting rod 1 passes through the top of the filter shell 12 and is connected with a hand wheel 6 arranged outside the filter shell 12; a sealing filler layer 7 is arranged between the filter shell 12 and the lifting rod 1, and a sealing bolt 2 matched with the filter shell 12 is arranged at the upper part of the sealing filler layer 7. The number of the cross bars 16 is four, and the included angle between every two adjacent cross bars 16 is 90 degrees; the upper part of the lifting rod 1 is provided with a scale 18. A tee joint 19 is arranged on the gasified black water outlet pipeline between the water outlet valve 9 and the filter shell 12, an air inlet pipeline with an air inlet valve 8 is arranged at the third end of the tee joint 19, an exhaust pipeline with an air outlet valve 5 is arranged on the filter shell 12 at the lower part of the gasified black water inlet pipeline, and a sewage pipeline with a sewage valve 14 is arranged at the bottom of the filter shell 12; the pipe diameter of the gasification black water inlet pipe is the same as that of the gasification black water outlet pipe; the top of the filter shell 12 is provided with a flange plate 3, and the top of the filter shell 12 is connected with the flange plate 3 through bolts.
A filtration method of a coal gasification black water filter comprises the following steps:
step 1: when the coal gasification black water filtering stage is performed, the air inlet valve 8, the air outlet valve 5 and the blow-off valve 14 are closed, the coal gasification black water enters the filter shell 12 through the water inlet valve 4, and is discharged out of the filter shell 12 through the filtering internal parts and the water outlet valve 9; the coal gasification black water filtering stage comprises a filtering initial stage, a filtering operation stage and a filtering final stage;
step 2: the scale on the lifting rod 1 is 0-10 mm, the scale on the lifting rod 1 is 0 in the initial state, the filter holes in the outer filter screen 11 and the inner filter screen 13 are not overlapped at all, and the filter holes on the outer filter screen 11 are blocked by the inner filter screen 13; when the filter is in the initial stage of filtration, the lifting rod 1 is controlled by the hand wheel 6 to lift, so that the scale on the lifting rod 1 is displayed as 3 mm, at the moment, the filter holes in the outer filter screen 11 and the inner filter screen 13 are partially overlapped, the aperture area of the filter holes is V1, and at the moment, the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 12.5kpa;
step 3: the gasified black water continuously enters the filter shell 12, the filtering holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 105kpa, the lifting rod 1 is controlled by the hand wheel 6 to lift, the scale on the lifting rod 1 is displayed as 8 mm, at the moment, the coal gasification black water is in the filtering running stage, the filtering holes in the outer filtering net 11 and the inner filtering net 13 are partially overlapped, the aperture area of the filtering holes is V2, and V2 is larger than V1; flushing the blockage under the action of coal gasification black water pressure, and enlarging the area of V2 to change the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline into 15kpa;
step 4: the coal gasification black water continuously enters the filter shell 12, the filter holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 105kpa, the lifting rod 1 is controlled by the hand wheel 6 to lift, the scale on the lifting rod 1 is displayed as 10mm, the filter holes in the outer filter screen 11 and the inner filter screen 13 are completely overlapped at the final stage of filtering, and under the condition that the blocking object is flushed and the filter holes are completely opened under the action of the coal gasification black water pressure, the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is changed to 15kpa;
step 5: the gasified black water continuously enters the filter shell 12, and when the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 105kpa, the blockage of the filter holes can be judged; at this time, a cleaning state is entered;
step 6: when the cleaning state is entered, the water inlet valve 4 and the water outlet valve 9 are closed, the air inlet valve 8, the air outlet valve 5 and the blow-off valve 14 are opened, and the scale on the lifting rod 1 is displayed as 10mm; the residual black water and solid particles in the filter shell 12 are discharged through a blow-down valve 14;
step 7: closing the blow-down valve 14, and introducing compressed air of 1.0-3.0Mpa into the air inlet pipeline with the air inlet valve 8, wherein the compressed air passes through the fully overlapped filter holes and is discharged through the air outlet valve 5; the particulate matter clogged in the filter holes during the above-mentioned compressed air flushing process is flushed into the bottom of the filter housing 12; the flow rate of the compressed air is 250 m/min;
step 8: the time of introducing compressed air in the step 7 is 5min; the number of times of compressed air is introduced into each cleaning period is 5 times;
step 9: after the cleaning cycle in the step 8 is finished, opening the blow-down valve 14 to discharge the solid particles or scale remained in the filter shell 12;
step 10: after the solid particles or scales remained in the filter housing 12 are discharged in the step 9, the blow-down valve 14 is closed, and the steps 2 to 5 are repeated to continuously filter the coal gasification black water.
According to the invention, the filtering aperture can be flexibly adjusted according to the working condition requirement by combining the fixed outer filter screen with the movable inner filter screen; judging the blocking condition according to the inlet and outlet pressure difference, and adjusting the filter aperture to prolong the service cycle of the invention; meanwhile, the invention can be cleaned without disassembly through the matched air cleaning device; the aperture of the filtering hole can be adjusted by a hand wheel.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, integrally connected, or detachably connected; or the communication between the two components is also possible; may be directly connected or indirectly connected through an intermediate medium, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to the specific circumstances. The above examples are only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, but all equivalent embodiments, modifications and adaptations without departing from the technical spirit of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. A filtering method of a coal gasification black water filter is characterized by comprising the following steps: the filtering method comprises the following steps:
step 1: when the coal gasification black water filtering stage is performed, the air inlet valve (8), the air outlet valve (5) and the blow-down valve (14) are closed, and the coal gasification black water enters the filter shell (12) through the water inlet valve (4) and is discharged out of the filter shell (12) through the filtering internal part and the water outlet valve (9); the coal gasification black water filtering stage comprises a filtering initial stage, a filtering operation stage and a filtering final stage;
step 2: the scale on the lifting rod (1) is 0-10 mm, the scale on the lifting rod (1) is 0 in the initial state, the filter holes in the outer filter screen (11) and the inner filter screen (13) are not overlapped at all, and the filter holes on the outer filter screen (11) are blocked by the inner filter screen (13); when the filter is in the initial stage of filtration, the lifting rod (1) is controlled by the hand wheel (6) to lift, so that scales on the lifting rod (1) are displayed as 3 mm, at the moment, the filter holes in the outer filter screen (11) and the inner filter screen (13) are partially overlapped, the aperture area of the filter holes is V1, and at the moment, the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline is 10-15 kpa;
step 3: the coal gasification black water continuously enters the filter shell (12), the filtering holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 100-110 kpa, the lifting rod (1) is controlled by the hand wheel (6) to lift, the scale on the lifting rod (1) is displayed as 8 mm, at the moment, the coal gasification black water is in a filtering running stage, the filtering holes in the outer filtering net (11) and the inner filtering net (13) are partially overlapped, the aperture area of the filtering holes is V2, and V2 is larger than V1; flushing the blockage under the action of coal gasification black water pressure, and enlarging the area of V2 to change the pressure difference between the black water inlet pipeline and the gasified black water outlet pipeline into 10-20 kpa;
step 4: the coal gasification black water continuously enters the filter shell (12), the filter holes are blocked after the coal gasification black water continuously runs for a period of time, when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 100-110 kpa, the lifting rod (1) is controlled by the hand wheel (6) to lift, the scale on the lifting rod (1) is displayed as 10mm, at the final stage of filtering, the filter holes in the outer filter screen (11) and the inner filter screen (13) are completely overlapped, and under the condition that the blocking object is punched out and the filter holes are completely opened under the action of the coal gasification black water pressure, the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is changed to 10-20 kpa;
step 5: continuously feeding coal gasification black water into the filter shell (12), and judging that the filter holes are blocked when the pressure difference between the black water inlet pipeline and the gasification black water outlet pipeline is 100-110 kpa; at this time, a cleaning state is entered;
step 6: when the cleaning state is entered, the water inlet valve (4) and the water outlet valve (9) are closed, the air inlet valve (8), the air outlet valve (5) and the blow-down valve (14) are opened, and the scale on the lifting rod (1) is displayed as 10mm;
residual black water and solid particles in the filter shell (12) are discharged through a blow-down valve (14);
step 7: closing the blow-down valve (14), and introducing compressed air of 1.0-3.0Mpa into an air inlet pipeline with an air inlet valve (8), wherein the compressed air passes through fully overlapped filter holes and is discharged through an air outlet valve (5); the compressed air is used for flushing the particulate matters in the filter holes into the bottom of the filter shell (12); the flow rate of the compressed air is 200-300 m/min;
step 8: the time of introducing compressed air in the step 7 is 5min; the compressed air is introduced for 4-6 times in each cleaning period;
step 9: after the cleaning period in the step 8 is finished, opening a blow-down valve (14) to discharge solid particles or scale sheets remained in the filter shell (12);
step 10: after the solid particles or scales remained in the discharge filter shell (12) in the step 9 are discharged, closing a blow-off valve (14), and repeating the steps 2 to 5 to continuously filter the coal gasification black water;
the coal gasification black water filter comprises a filter shell (12), wherein a filtering internal part is arranged in the filter shell (12);
a gasified black water inlet pipeline with a water inlet valve (4) is arranged on a filter shell (12) corresponding to one side of the filtering internal part, and a gasified black water outlet pipeline with a water outlet valve (9) is arranged on the filter shell (12) corresponding to the upper part of the other side of the filtering internal part;
the filter inner piece comprises an outer filter screen (11) fixedly arranged in a filter shell (12) and an inner filter screen (13) which is attached to the inner side of the outer filter screen (11) and can move.
2. The filtration method of the coal gasification black water filter according to claim 1, wherein: the outer filter screen (11) is of a cylinder structure with an opening at the upper part, and a baffle (10) connected with the inner wall of the filter shell (12) is arranged at the outer side of the upper part of the cylinder structure; the bottom plate (17) is arranged at the inner bottom of the cylinder structure.
3. The filtration method of the coal gasification black water filter according to claim 2, wherein: the bottom plate (17) is a blind plate or a screen plate; the ratio of the width of the baffle (10) to the diameter of the outer filter screen (11) is 1:3-4; the inner diameter of the outer filter screen (11) is equal to the outer diameter of the inner filter screen (13); the thickness of the outer filter screen (11) is consistent with that of the inner filter screen (13), and the thickness of the outer filter screen (11) is 2-5 mm.
4. A filtration method of a coal gasification black water filter according to claim 3, wherein: the pore diameter of the filtering holes at the upper part of the outer filter screen (11) is consistent with the pore diameter of the filtering holes of the inner filter screen (13), the pore diameter of the filtering holes of the inner filter screen (13) is 8-10 mm, the interval between two adjacent rows of filtering holes is 8-10 mm, and the pore diameters of the two rows of filtering holes at the lowest part of the outer filter screen (11) are 3-5 mm.
5. A filtration method of a coal gasification black water filter according to claim 3, wherein: the sieve pore diameter of the sieve plate is smaller than the pore diameter of the filter pore of the inner filter screen (13).
6. A filtration method of a coal gasification black water filter according to claim 3, wherein: the top height of the outer filter screen (11) is the same as the top height of the baffle (10), and the top height of the inner filter screen (13) is 8-10 mm greater than the top height of the baffle (10).
7. The filtration method of the coal gasification black water filter according to claim 1, wherein: the inner filter screen (13) is a cylinder unit with an opening at the upper part and the lower part, a plurality of supporting rods (15) are arranged on the inner wall of the cylinder unit, and the supporting rods (15) are respectively connected with a lifting rod (1) arranged in the middle of the inside of the cylinder unit through corresponding cross rods (16); the top of the lifting rod (1) passes through the top of the filter shell (12) and is connected with a hand wheel (6) arranged outside the filter shell (12); a sealing filler layer (7) is arranged between the filter shell (12) and the lifting rod (1), and a sealing bolt (2) matched with the filter shell (12) is arranged at the upper part of the sealing filler layer (7).
8. The filtration method of the coal gasification black water filter according to claim 7, wherein: the number of the cross bars (16) is four, and the included angle between every two adjacent cross bars (16) is 90 degrees; the upper part of the lifting rod (1) is provided with a scale (18).
9. The filtration method of the coal gasification black water filter according to claim 1, wherein: a tee joint (19) is arranged on a gasified black water outlet pipeline between the water outlet valve (9) and the filter shell (12), an air inlet pipeline with an air inlet valve (8) is arranged at the third end of the tee joint (19), an exhaust pipeline with an air outlet valve (5) is arranged on the filter shell (12) at the lower part of the gasified black water inlet pipeline, and a sewage pipeline with a sewage valve (14) is arranged at the bottom of the filter shell (12); the pipe diameter of the gasification black water inlet pipe is the same as that of the gasification black water outlet pipe;
the top of the filter shell (12) is provided with a flange plate (3), and the top of the filter shell (12) is connected with the flange plate (3) through bolts.
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| CN113041689A (en) * | 2021-04-02 | 2021-06-29 | 沧州信联化工有限公司 | Reduced pressure filtering device for tetramethylammonium hydroxide production and use method thereof |
| CN113842682A (en) * | 2021-10-19 | 2021-12-28 | 浙江大学 | Self-exhausting semi-closed air-water combined backwashing contact flocculation filter |
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