CN110643764A - Sand washing descaling method for blast furnace cooling wall pipeline - Google Patents
Sand washing descaling method for blast furnace cooling wall pipeline Download PDFInfo
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- CN110643764A CN110643764A CN201910196908.7A CN201910196908A CN110643764A CN 110643764 A CN110643764 A CN 110643764A CN 201910196908 A CN201910196908 A CN 201910196908A CN 110643764 A CN110643764 A CN 110643764A
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- sand washing
- cooling wall
- sand
- blast furnace
- washing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a sand washing descaling method for a blast furnace cooling wall pipeline, which comprises the following descaling steps: firstly, screening return ores according to physical performance indexes of sintered ores for a blast furnace; sieving the return ores of the sintering ores by using a screen to obtain a 3-5mm size fraction sand washing material in the return ores of the sintering ores; washing the selected 3-5mm size fraction agglomerate return ores with clear water, and cleaning and removing dust in the agglomerate; then loading the washed sand washing material into a sand washing hopper; a filter screen is additionally arranged at the tail end of a water outlet pipe of a cooling wall of the blast furnace; starting an air compressor, and blowing the sand washing material into a cooling wall pipeline by high-pressure compressed air; if no sand washing material flows out of the water discharged from the cooling wall pipeline, the sand washing operation is finished; and after sand washing is finished, recovering the sand washing material in the filter screen to the sinter return pond. Effectively removes the scaling substances in the pipeline of the cooling wall, creates conditions for the long service life of the blast furnace, and simultaneously avoids the physical harm to blast furnace operators caused by manual dosing in the prior art.
Description
Technical Field
The invention belongs to the technical field of blast furnace ironmaking, and relates to a sand washing descaling method for a blast furnace cooling wall pipeline.
Background
At present, in a blast furnace cooling system, part of large blast furnaces adopt a soft water closed circulation cooling process, and part of blast furnaces still adopt an open industrial water circulation cooling process due to condition limitation. No matter which cooling process is adopted, along with the prolonging of the service cycle of the cooling wall pipeline of the blast furnace, particularly in the later period of the furnace life of the blast furnace, the lining of the furnace body falls off, and in addition, the protective slag crust generated on the furnace wall is unstable, the cooling wall is directly contacted with high-temperature substances in the furnace, the water temperature of the cooling wall pipeline rises, and the scaling phenomenon of the cooling wall pipeline cannot be avoided.
When the cooling wall pipeline is scaled, the thermal resistance of the cooling wall is increased, the cooling effect is greatly weakened, and under the condition that the heat flow intensity of the cooling wall is higher, the temperature gradient of the cooling wall is increased due to scaling in the cooling wall pipeline, so that the cooling wall is easy to burn out and leak water, and the safety production of the blast furnace is seriously threatened.
Under the existing technical conditions, when the cooling wall pipeline is scaled, a medicament-added acid washing method is generally adopted to remove the scale. The cost of adding the medicament is high, the reduction of the blast furnace smelting cost is not facilitated, meanwhile, the medicament has large damage to the body of an operator, and the body of a worker who participates in the medicament adding for a long time has adverse reaction.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a sand washing descaling method for a cooling wall pipeline of a blast furnace, which can effectively remove scaling substances in the cooling wall pipeline through a sand washing descaling technology, creates conditions for the long service life of the blast furnace and simultaneously avoids the physical harm to blast furnace operators caused by manual dosing in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a sand washing descaling method for a blast furnace cooling wall pipeline comprises the following descaling steps:
a) selecting sand washing materials: selecting a sintered ore batch with a drum index of more than 78% to sieve return ores according to the physical performance index of the sintered ore for the blast furnace;
b) screening: sieving the return ores of the sinter ores by using a 5mm screen, sieving out parts with the granularity smaller than 5mm, and sieving by using a 3mm screen to obtain sand washing materials with the size of 3-5mm in the return ores of the sinter ores;
c) cleaning sand and washing materials: washing the selected 3-5mm size fraction agglomerate return ores with clear water, and cleaning and removing dust in the agglomerate until the water quality after cleaning is clear;
d) charging: filling the washed sand washing material into a sand washing bucket, wherein the volume of the sand washing bucket is 1/3-1/2, and simultaneously closing a valve of a charging hole of the sand washing bucket;
e) before sand washing operation, a filter screen is additionally arranged at a cooling water return tank at the tail end of a water outlet pipe of a cooling wall of a blast furnace;
f) starting an air compressor, opening a compressed air valve, opening a sand washing valve, and blowing the sand washing material into a cooling wall pipeline by high-pressure compressed air;
g) if no sand washing material flows out of the water discharged from the cooling wall pipeline, closing a sand washing valve, stopping the operation of an air compressor, and finishing the sand washing operation;
i) and after sand washing is finished, recovering the sand washing material in the filter screen to the sinter return pond.
Preferably, the pore size of the filter screen in the step e) is less than 3 mm.
Preferably, after the air compressor is started, the pressure of the compressed air is 0.5-0.7 MPa.
Preferably, the volume of the sand washing bucket is 0.125m, and the sand washing bucket is filled with the sand washing material to 1/2 volume parts.
Preferably, the same cooling wall pipeline is subjected to sand washing, the sand washing process can be repeatedly used for multiple times, and finally, the frequency of the sand washing is determined by the fact that no scale is generated in the effluent water after the sand washing of the cooling wall.
The invention has the positive effects that: the sand grains are driven to move by means of gas-liquid two-phase movement of high-pressure high-speed flow, the sand grains are in contact with scales in the cooling wall pipeline to generate large friction force, and the scales in the pipeline are scoured and damaged by the friction force, so that the purpose of cleaning scales is achieved, the scales in the cooling wall pipeline are effectively removed, conditions are created for the long service life of the blast furnace, and meanwhile, the physical damage of manual dosing to blast furnace operators in the prior art is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic view of the process of the present invention
FIG. 2 is a flow chart of the process for producing sand-washed materials of the present invention
In the figure: the method comprises the following steps of 1-air compressor, 2-compressed air valve, 3-sand washing bucket, 4-sand washing valve, 5-cooling wall water inlet valve, 6-cooling wall pipeline, 7-cooling wall water outlet valve, 8-filter screen and 9-cooling water return tank.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The first embodiment is as follows:
a sand washing descaling method for a cooling wall pipeline comprises the following steps:
a) selecting sand washing materials: selecting a sinter batch with a drum index of more than 78% according to the physical performance index of the sinter for the blast furnace, and taking a certain amount of return fines from the sinter undersize under a blast furnace slot;
b) screening: sieving the return ores of the sinter ores by using a 5mm screen, sieving out parts with the granularity smaller than 5mm, and sieving by using a 3mm screen to obtain sand washing materials with the size of 3-5mm in the return ores of the sinter ores;
c) cleaning sand and washing materials: washing the selected 3-5mm size fraction agglomerate return ores with clear water, and cleaning and removing dust in the agglomerate until the water quality after cleaning is clear;
d) charging: filling the sand washing material into a sand washing bucket 3, filling the sand washing material into the sand washing bucket from 1/3 to 1/2, and closing a valve of a filling hole of the sand washing bucket 3;
e) before sand washing operation, a filter screen 8 is additionally arranged at a cooling water return tank 9 at the tail end of a water outlet pipe 7 of a cooling wall of the blast furnace, and the aperture of the filter screen is 2 mm;
f) starting an air compressor 1, opening a compressed air valve 2, opening a sand washing valve 4, and blowing a sand washing material into a cooling wall pipeline 6 by high-pressure compressed air;
g) and (4) if no sand washing material flows out of the water discharged from the cooling wall pipeline 6, closing the sand washing valve 4, stopping the operation of the air compressor 1 and finishing the sand washing operation.
h) And recovering the sand washing material in the filter screen 8 to the sinter return pond.
Preferably, in this embodiment, the compressed air pressure is 0.7 MPa.
Preferably, the volume of the sand washing bucket is 0.125m, and the sand washing bucket is filled with the sand washing material to 1/2 volume parts.
Preferably, in this embodiment, the same stave pipe is sand washed using a single sand wash process.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A sand washing descaling method for a blast furnace cooling wall pipeline is characterized by comprising the following descaling steps:
a) selecting sand washing materials: selecting a sintered ore batch with a drum index of more than 78% to sieve return ores according to the physical performance index of the sintered ore for the blast furnace;
b) screening: sieving the return ores of the sinter ores by using a 5mm screen, sieving out parts with the granularity smaller than 5mm, and sieving by using a 3mm screen to obtain sand washing materials with the size of 3-5mm in the return ores of the sinter ores;
c) cleaning sand and washing materials: washing the selected 3-5mm size fraction agglomerate return ores with clear water, and cleaning and removing dust in the agglomerate until the water quality after cleaning is clear;
d) charging: filling the washed sand washing material into a sand washing bucket, wherein the volume of the sand washing bucket is 1/3-1/2, and simultaneously closing a valve of a charging hole of the sand washing bucket;
e) before sand washing operation, a filter screen is additionally arranged at a cooling water return tank at the tail end of a water outlet pipe of a cooling wall of a blast furnace;
f) starting an air compressor, opening a compressed air valve, opening a sand washing valve, and blowing the sand washing material into a cooling wall pipeline by high-pressure compressed air;
g) if no sand washing material flows out of the water discharged from the cooling wall pipeline, closing a sand washing valve, stopping the operation of an air compressor, and finishing the sand washing operation;
i) and after sand washing is finished, recovering the sand washing material in the filter screen to the sinter return pond.
2. A sand washing descaling method for the blast furnace cooling wall pipeline according to claim 1, characterized in that: the aperture of the filter screen in the step e) is less than 3 mm.
3. A sand washing descaling method for the blast furnace cooling wall pipeline according to claim 1, characterized in that: after the air compressor is started, the pressure of compressed air is 0.5-0.7 MPa.
4. A sand washing descaling method for the blast furnace cooling wall pipeline according to claim 1, characterized in that: and (4) carrying out sand washing on the sand washing bucket with the volume of 0.125m until the sand washing material is loaded to 1/2 volume parts.
5. A sand washing descaling method for the blast furnace cooling wall pipeline according to claim 1, characterized in that: and (3) sand-washing the same cooling wall pipeline, repeatedly using the sand-washing process for multiple times, and finally determining the frequency of sand-washing by using that no scale is generated in the outlet water after sand-washing the cooling wall.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910196908.7A CN110643764A (en) | 2019-03-15 | 2019-03-15 | Sand washing descaling method for blast furnace cooling wall pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910196908.7A CN110643764A (en) | 2019-03-15 | 2019-03-15 | Sand washing descaling method for blast furnace cooling wall pipeline |
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| CN110643764A true CN110643764A (en) | 2020-01-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD270084A1 (en) * | 1988-03-15 | 1989-07-19 | Freiberg Brennstoffinst | METHOD AND DEVICE FOR PREVENTING TRANSFER IN PRESSURE GAS GENERATORS |
| CN103438756A (en) * | 2013-08-11 | 2013-12-11 | 山西新泰钢铁有限公司 | Cooler descaling device |
| CN204194399U (en) * | 2014-10-09 | 2015-03-11 | 方大特钢科技股份有限公司 | Packaged type pipeline sand washing system |
| CN107489401A (en) * | 2017-09-12 | 2017-12-19 | 大庆信志合科技有限责任公司 | A kind of process of water-jet sleeve pipe apparatus for eliminating sludge and the application device |
| CN108317891A (en) * | 2018-01-30 | 2018-07-24 | 武汉工程大学 | A kind of heat exchanger descaling rinsing system and its descaling rinsing method |
-
2019
- 2019-03-15 CN CN201910196908.7A patent/CN110643764A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD270084A1 (en) * | 1988-03-15 | 1989-07-19 | Freiberg Brennstoffinst | METHOD AND DEVICE FOR PREVENTING TRANSFER IN PRESSURE GAS GENERATORS |
| CN103438756A (en) * | 2013-08-11 | 2013-12-11 | 山西新泰钢铁有限公司 | Cooler descaling device |
| CN204194399U (en) * | 2014-10-09 | 2015-03-11 | 方大特钢科技股份有限公司 | Packaged type pipeline sand washing system |
| CN107489401A (en) * | 2017-09-12 | 2017-12-19 | 大庆信志合科技有限责任公司 | A kind of process of water-jet sleeve pipe apparatus for eliminating sludge and the application device |
| CN108317891A (en) * | 2018-01-30 | 2018-07-24 | 武汉工程大学 | A kind of heat exchanger descaling rinsing system and its descaling rinsing method |
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