CN113842683A - System for backwashing grain slag filter layer by gas-liquid two-phase flow and backwashing method thereof - Google Patents
System for backwashing grain slag filter layer by gas-liquid two-phase flow and backwashing method thereof Download PDFInfo
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- CN113842683A CN113842683A CN202111139120.6A CN202111139120A CN113842683A CN 113842683 A CN113842683 A CN 113842683A CN 202111139120 A CN202111139120 A CN 202111139120A CN 113842683 A CN113842683 A CN 113842683A
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- output port
- pump set
- slag
- hot water
- valve
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- 239000002893 slag Substances 0.000 title claims abstract description 63
- 238000011001 backwashing Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 title claims abstract description 16
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000011010 flushing procedure Methods 0.000 claims abstract description 41
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000010926 purge Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4631—Counter-current flushing, e.g. by air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
- B01D24/4884—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration by pressure measuring
-
- 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
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
- B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
-
- 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
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/032—Separating slag from liquid, e.g. from water, after quenching
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
Abstract
The invention provides a system for backwashing a water slag filter layer by gas-liquid two-phase flow, wherein an output port of a water slag groove is communicated with an input port of a filter tank, the filter tank is provided with a filter layer, a bottom output port of the filter tank is communicated with an input port of a hot water pump set, an output port of the hot water pump set is communicated with an input port of a cooling tower, the cooling tower is communicated with a flushing slag cold water tank, an output port of the flushing slag cold water tank is communicated with an input port of a flushing slag pump set, and an output port of the flushing slag pump set is respectively communicated with an input port of a flushing box and an output port of the filter tank; the output port of the gas supply unit is communicated with the output port of the filter tank; a pipeline of the air supply unit communicated with the output port of the filter tank is provided with an air supply cut-off valve, and a pipeline of the input port of the hot water pump set is provided with a hot water valve; the pipeline that the output of towards sediment pump package and the delivery outlet of filtering ponds communicate is provided with back flush valve, hot water pump package and towards sediment pump package delivery outlet all are provided with the trip valve, can effectively wash the filter layer.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a system for backwashing a water slag filter layer by gas-liquid two-phase flow and a backwashing method thereof.
Background
The blast furnace can generate a large amount of high-temperature molten slag in the normal production process, and is divided from the slag-water separation angle after the molten slag is quenched by water, and at present, two modes, namely a mechanical method and a bottom filtration method, mainly exist. However, the mechanical method has the disadvantages of high failure rate and large workload of maintenance and repair, and thus the acceptance in the market is gradually reduced.
The core component for separating slag water by the bottom filtration water slag flushing process is a filter layer, and generally consists of natural cobblestones or a filter plate and the like. When the filter layer is used, the water slag and other impurities are easy to deposit to cause blockage and hardening, so that the effect of separating the slag from the water is influenced.
In the prior art, no effective means for effectively clearing the filtering layer and ensuring the safety and stability of the whole system exists at present.
Disclosure of Invention
In view of the above, the present invention provides a system for backwashing a grain slag filter layer with a gas-liquid two-phase flow and a backwashing method thereof, which can effectively improve the backwashing effect of the filter layer of a filter tank, reduce the probability of filter layer blockage and hardening, prolong the service life of the filter layer, effectively prevent air from entering the system due to evacuation of the filter tank, cause cavitation of a water pump, and improve the safety of the whole system.
The invention provides a system for backwashing a water slag filter layer by gas-liquid two-phase flow, which comprises a water slag tank, a filter tank, a hot water pump set, a cooling tower, a slag flushing cold water tank, a slag flushing pump set and a gas supply unit, wherein the filter tank is connected with the water slag tank;
the output port of the slag flushing water tank is communicated with the input port of the flushing tank and the output port of the filtering tank; the output port of the gas supply unit is communicated with the output port of the filter tank;
a pipeline of the air supply unit communicated with the output port of the filter tank is provided with an air supply cut-off valve, and a pipeline of the input port of the hot water pump set is provided with a hot water valve; and a back flush valve is arranged on a pipeline communicated with the output end of the slag flushing pump set and the output port of the filter tank, and the output ports of the hot water pump set and the slag flushing pump set are provided with cut-off valves.
Further, the filtering tank is provided with a pressure gauge.
Correspondingly, the invention provides a method for backwashing a grain slag filter layer by gas-liquid two-phase flow based on the system, which comprises the following steps:
s1, opening an air supply cut-off valve, and controlling an air supply unit to work to purge a filter layer of a filter tank;
s2, closing the air supply stop valve, and sequentially performing the following operations: opening a back flush valve, starting a slag flushing pump set and opening a cut-off valve of an output port of the slag flushing pump set;
s3, after the step S2 is executed, closing a stop valve, a slag flushing pump set and a back flushing valve of an output port of a slag flushing pump set in sequence;
s4, the following actions are sequentially executed: opening a hot water valve, starting a hot water pump set and opening a stop valve of an output port of the water pump set;
and S5, judging whether the pressure in the filtering tank is smaller than or equal to a set pressure value, if so, closing a hot water pump set output port stop valve, a hot water pump set and a hot water valve in sequence.
Further, in step S1, the gas supply unit outputs a compressed gas at a pressure of 0.1 to 0.3 MPa.
Further, the execution time in step S1 is 3min to 5 min.
Further, the execution time of step S2 is not more than 5 min.
Further, the value range of the set pressure value is 10 kPa-20 kPa.
The invention has the beneficial effects that: the invention can effectively improve the back washing effect of the filter layer of the filter tank, reduce the probability of blockage and hardening, prolong the service life of the filter layer, effectively avoid the phenomenon of vacuumizing the filter tank and improve the safety of the whole system.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a flow chart of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings of the specification:
the invention provides a system for backwashing a water granulated slag filter layer by gas-liquid two-phase flow, which comprises a water granulated slag groove 1, a filter tank 2, a hot water pump set 6, a cooling tower 7, a slag flushing cold water tank 8, a slag flushing pump set 9 and an air supply unit 11;
the output port of the slag bath 1 is communicated with the input port of the filter tank 2, the filter tank 2 is provided with a filter layer 3, the output port at the bottom of the filter tank 2 is communicated with the input port of a hot water pump set 6, the output port of the hot water pump set 6 is communicated with the input port of a cooling tower 7, the cooling tower 7 is communicated with a slag flushing cold water tank 8, the output port of the slag flushing cold water tank 8 is communicated with the input port of a slag flushing pump set 9, and the output port of the slag flushing pump set 9 is respectively communicated with the input port of a flushing box 15 and the output port of the filter tank 2; the output port of the gas supply unit 11 is communicated with the output port of the filter tank 2; wherein, the punching box 15 is arranged at the input port of the granulated slag groove 1, and the input port of the granulated slag groove is also provided with a slag melting groove 16;
an air supply cut-off valve 12 is arranged on a pipeline of the air supply unit 11 communicated with the output port of the filter tank 2, and a hot water valve 5 is arranged on a pipeline of the input port of the hot water pump set 6; the pipeline that the delivery outlet of towards sediment pump package 9 and filtering ponds 2 communicate is provided with back flush valve 14 on, hot water pump package 6 and towards sediment pump package 9 delivery outlet all are provided with trip valve (10, 13), through above-mentioned structure, can effectively improve the back flush effect of the filter layer of filtering ponds, reduce the probability that the filter layer blocks up, hardens and take place, the life of extension filter layer.
In this embodiment, the filtering tank 2 is provided with the pressure gauge 4, and by this structure, the filtering tank can be effectively prevented from being vacuumized, thereby ensuring the safety of the whole system.
Correspondingly, the invention provides a method for backwashing a grain slag filter layer by gas-liquid two-phase flow based on the system, which comprises the following steps:
s1, opening an air supply cut-off valve, and controlling an air supply unit to work to purge a filter layer of a filter tank;
s2, closing the air supply stop valve, and sequentially performing the following operations: opening a back flush valve, starting a slag flushing pump set and opening a cut-off valve of an output port of the slag flushing pump set;
s3, after the step S2 is executed, closing a stop valve, a slag flushing pump set and a back flushing valve of an output port of a slag flushing pump set in sequence;
s4, the following actions are sequentially executed: opening a hot water valve, starting a hot water pump set and opening a stop valve of an output port of the water pump set;
and S5, judging whether the pressure in the filtering tank is smaller than or equal to a set pressure value, if so, closing a hot water pump set output port stop valve, a hot water pump set and a hot water valve in sequence to finish washing.
By the method, the backwashing effect of the filter layer in the filter tank can be effectively improved, the probability of blockage and hardening of the filter layer is reduced, the service life of the filter layer is prolonged, the phenomenon that air enters a system to cause water pump cavitation caused by evacuation of the filter tank can be effectively avoided, and the safety of the whole system is improved.
In step S1, the gas output by the gas supply unit is compressed gas with a pressure of 0.1MPa to 0.3MPa, and the compressed gas is compressed air or compressed nitrogen.
Wherein, the execution time in the step S1 is 3 min-5 min.
The execution time of the step S2 is not more than 5min, and by the method, the filter layer can be effectively ensured to be well washed, and the safety of the whole system is ensured.
In this embodiment, the set pressure value range is 10kPa to 20kPa, and by this method, the flushing effect can be ensured and the safety of the entire system can be ensured.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A system for backwashing a grain slag filter layer by gas-liquid two-phase flow is characterized in that: comprises a slag trough, a filter tank, a hot water pump set, a cooling tower, a slag flushing cold water tank, a slag flushing pump set and an air supply unit;
the output port of the slag flushing water tank is communicated with the input port of the flushing tank and the output port of the filtering tank; the output port of the gas supply unit is communicated with the output port of the filter tank;
a pipeline of the air supply unit communicated with the output port of the filter tank is provided with an air supply cut-off valve, and a pipeline of the input port of the hot water pump set is provided with a hot water valve; and a back flush valve is arranged on a pipeline communicated with the output end of the slag flushing pump set and the output port of the filter tank, and the output ports of the hot water pump set and the slag flushing pump set are provided with cut-off valves.
2. The system for backwashing a grain slag filter layer by using gas-liquid two-phase flow according to claim 1, wherein: the filtering tank is provided with a pressure gauge.
3. A method for backwashing a grain slag filter layer by gas-liquid two-phase flow based on the system of claim 1 or 2, which is characterized in that: the method comprises the following steps:
s1, opening an air supply cut-off valve, and controlling an air supply unit to work to purge a filter layer of a filter tank;
s2, closing the air supply stop valve, and sequentially performing the following operations: opening a back flush valve, starting a slag flushing pump set and opening a cut-off valve of an output port of the slag flushing pump set;
s3, after the step S2 is executed, closing a stop valve, a slag flushing pump set and a back flushing valve of an output port of a slag flushing pump set in sequence;
s4, the following actions are sequentially executed: opening a hot water valve, starting a hot water pump set and opening a stop valve of an output port of the water pump set;
and S5, judging whether the pressure in the filtering tank is smaller than or equal to a set pressure value, if so, closing a hot water pump set output port stop valve, a hot water pump set and a hot water valve in sequence.
4. The method for backwashing a grain slag filter layer by using gas-liquid two-phase flow according to claim 3, wherein the method comprises the following steps: in step S1, the gas output from the gas supply unit is compressed gas, and the pressure is 0.1MPa to 0.3 MPa.
5. The method for backwashing a grain slag filter layer by using gas-liquid two-phase flow according to claim 4, wherein the method comprises the following steps: the execution time in step S1 is 3min to 5 min.
6. The method for backwashing a grain slag filter layer by using gas-liquid two-phase flow according to claim 3, wherein the method comprises the following steps: the execution time of step S2 is not greater than 5 min.
7. The method for backwashing a grain slag filter layer by using gas-liquid two-phase flow according to claim 3, wherein the method comprises the following steps: the set pressure value ranges from 10kPa to 20 kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139120.6A CN113842683B (en) | 2021-09-27 | 2021-09-27 | System for back flushing water slag filter layer by gas-liquid two-phase flow and back flushing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139120.6A CN113842683B (en) | 2021-09-27 | 2021-09-27 | System for back flushing water slag filter layer by gas-liquid two-phase flow and back flushing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113842683A true CN113842683A (en) | 2021-12-28 |
| CN113842683B CN113842683B (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111139120.6A Active CN113842683B (en) | 2021-09-27 | 2021-09-27 | System for back flushing water slag filter layer by gas-liquid two-phase flow and back flushing method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1393568A (en) * | 2001-07-03 | 2003-01-29 | 昆明钢铁集团有限责任公司炼铁厂 | Method for using air or water to reversely flush grain slag filter of blast furnace |
| KR20040058088A (en) * | 2002-12-26 | 2004-07-03 | 주식회사 타 셋 | Automatic backwash filter |
| CN202415575U (en) * | 2011-12-23 | 2012-09-05 | 山东省冶金地质水文勘察公司 | System for utilizing waste heat of slag quenching water of blast furnace |
| CN203238277U (en) * | 2013-05-06 | 2013-10-16 | 山东省冶金地质水文勘察公司 | Backwash water collecting system for blast furnace slag flushing water waste-heat utilization fiber bundle filter |
| CN104946828A (en) * | 2015-07-03 | 2015-09-30 | 珠海格力电器股份有限公司 | Waste heat recovery device and waste heat recovery system for cinder flushing water of blast furnace |
| AU2020101109A4 (en) * | 2019-07-03 | 2020-08-20 | Zhejiang Hengdong Environmental Technology Co., Ltd. | Particulate filtering device with a multi-layer water distribution and collection structure and method for using the same |
| CN212091247U (en) * | 2020-04-20 | 2020-12-08 | 中冶京诚工程技术有限公司 | Blast furnace water slag bottom filter tank with layered filter pipes |
-
2021
- 2021-09-27 CN CN202111139120.6A patent/CN113842683B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1393568A (en) * | 2001-07-03 | 2003-01-29 | 昆明钢铁集团有限责任公司炼铁厂 | Method for using air or water to reversely flush grain slag filter of blast furnace |
| KR20040058088A (en) * | 2002-12-26 | 2004-07-03 | 주식회사 타 셋 | Automatic backwash filter |
| CN202415575U (en) * | 2011-12-23 | 2012-09-05 | 山东省冶金地质水文勘察公司 | System for utilizing waste heat of slag quenching water of blast furnace |
| CN203238277U (en) * | 2013-05-06 | 2013-10-16 | 山东省冶金地质水文勘察公司 | Backwash water collecting system for blast furnace slag flushing water waste-heat utilization fiber bundle filter |
| CN104946828A (en) * | 2015-07-03 | 2015-09-30 | 珠海格力电器股份有限公司 | Waste heat recovery device and waste heat recovery system for cinder flushing water of blast furnace |
| AU2020101109A4 (en) * | 2019-07-03 | 2020-08-20 | Zhejiang Hengdong Environmental Technology Co., Ltd. | Particulate filtering device with a multi-layer water distribution and collection structure and method for using the same |
| CN212091247U (en) * | 2020-04-20 | 2020-12-08 | 中冶京诚工程技术有限公司 | Blast furnace water slag bottom filter tank with layered filter pipes |
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| CN113842683B (en) | 2023-05-26 |
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