CN110585767A - Internal rotation sedimentation device and application thereof - Google Patents
Internal rotation sedimentation device and application thereof Download PDFInfo
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- CN110585767A CN110585767A CN201911007508.3A CN201911007508A CN110585767A CN 110585767 A CN110585767 A CN 110585767A CN 201911007508 A CN201911007508 A CN 201911007508A CN 110585767 A CN110585767 A CN 110585767A
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- 238000004062 sedimentation Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 253
- 239000002893 slag Substances 0.000 claims abstract description 63
- 239000013049 sediment Substances 0.000 claims abstract description 44
- 238000001556 precipitation Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 14
- 238000005469 granulation Methods 0.000 claims description 8
- 230000003179 granulation Effects 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 238000005453 pelletization Methods 0.000 claims 2
- 239000008187 granular material Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 235000020985 whole grains Nutrition 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0024—Inlets or outlets provided with regulating devices, e.g. valves, flaps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2405—Feed mechanisms for settling tanks
- B01D21/2411—Feed mechanisms for settling tanks having a tangential inlet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
- B01D21/34—Controlling the feed distribution; Controlling the liquid level ; Control of process parameters
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
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- 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
- C02F2001/007—Processes including a sedimentation step
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to an internal rotation sedimentation device and application thereof, belonging to the technical field of water quality treatment and water quantity balance, wherein the internal rotation sedimentation device comprises a closed outer cylinder and an inner cylinder arranged at the inner side of the outer cylinder, and the inner cylinder and the outer cylinder are communicated with each other through an opening at the bottom of the inner cylinder; the bottom of the inner cylinder is provided with an outward extending baffle, the baffle and a side plate at the lower part of the outer cylinder enclose a sediment area, and the bottom of the sediment area is provided with a slag discharge pipe; the upper part of the inner cylinder is provided with a water inlet pipe, the upper part of the outer cylinder is provided with a water outlet pipe, and the water inlet of the water outlet pipe is positioned above the water outlet of the water outlet pipe; along the axial direction of the outer cylinder, the water outlet of the water inlet pipe is positioned between the water inlet and the water outlet of the water outlet pipe; the top of the outer cylinder is provided with an exhaust pipe communicated with the atmosphere. The granulating circulating water of the granulating circulating water system of the blast furnace granulated slag is purified by arranging the internal rotation precipitation device and is used in the system, so that the external water quantity entering the system is reduced, and the problem of large water consumption of the system in the prior art is solved.
Description
Technical Field
The invention belongs to the field of water quality treatment and water quantity balance, and relates to an internal rotation sedimentation device and application thereof.
Background
With the improvement of the management level of the blast furnace unit of the steel plant and the improvement of the technology, the water consumption of the water granulated slag system is gradually reduced. At present, the water consumption of the steel plant is mainly the necessary replenishing water of a water tank and the water of a drum cleaning pump, and the water of the drum cleaning pump is the main replenishing water of the system. Because the water quantity of the whole grain slag system is balanced, the make-up water is equal to the internal consumption and the sewage discharge quantity.
From the perspective of water conservation and environmental protection, it is a trend of industry development to reduce the sewage discharge of a water slag system, and the reduction of the sewage discharge of the water slag system requires the reduction of the supplementary water of the water slag system.
The existing drum cleaning pump water source comes from factory production water or cascade water, so that the circulating water of the granulating slag system is needed to be designed to replace the production water or the cascade water, and a water source is provided for other water used by the drum cleaning pump or the system.
Disclosure of Invention
In view of the above, an object of the present application is to provide an internal rotation precipitation device and an application thereof, in which the internal rotation precipitation device is arranged to purify granulated circulating water in a granulated circulating water system of blast furnace granulated slag, so as to supply water to the system, reduce an amount of external water entering the system, and solve a problem of large water consumption of the system in the prior art.
In order to achieve the aim, the invention provides an internal rotation sedimentation device, which comprises a closed outer cylinder and an inner cylinder arranged at the inner side of the outer cylinder, wherein the inner cylinder is communicated with the outer cylinder through an opening at the bottom of the inner cylinder; the bottom of the inner cylinder is provided with an outward extending baffle, a sediment area is defined by the baffle and a side plate at the lower part of the outer cylinder, and the bottom of the sediment area is provided with a slag discharge pipe; the upper part of the inner barrel is provided with a water inlet pipe, the upper part of the outer barrel is provided with a water outlet pipe, and a water inlet of the water outlet pipe is positioned above a water outlet of the water outlet pipe; along the axial direction of the outer barrel, the water outlet of the water inlet pipe is positioned between the water inlet and the water outlet of the water outlet pipe; and the top of the outer barrel is provided with an exhaust pipe communicated with the atmosphere.
Optionally, the water inlet of the water outlet pipe is funnel-shaped.
Optionally, the water outlet of the water inlet pipe is 1.3-2.0 m lower than the top of the outer barrel
Optionally, the inlet tube is tangential to the inner wall of the inner barrel.
Optionally, the sediment region is in an inverted cone shape, and an included angle alpha between a side plate of the sediment region and the bottom of the sediment region is not less than 60 degrees.
Optionally, the baffle is provided with a plurality of through holes.
Optionally, the angle β between the baffle and the side plate of the sediment zone is 80 °.
Optionally, a gap of 100mm-150mm is left between the lower edge of the baffle and the side plate of the sediment zone.
The invention also provides a granulating circulating water system of blast furnace granulated slag, which comprises a cooling tower, a granulating cold water pool, a granulating return water pool, a water storage tank and an electric cabinet, and is characterized in that: further comprising an internal rotation precipitation device according to any one of claims 1 to 8; a water inlet pipe of the internal rotation sedimentation device is communicated with the granulation cold water tank, the top of the internal rotation sedimentation device is lower than the overflow water level of the granulation cold water tank, and a water outlet pipe of the internal rotation sedimentation device is connected to a user; the granulating cold water tank is positioned below the cooling tower, granulating circulating water of blast furnace granulated slag firstly enters the granulating cold water tank through the cooling tower, then automatically flows into the internal rotation sedimentation device for treatment and recycling, is discharged to the granulating water return tank after being used by a user, then enters the cooling tower for cooling, and then enters the granulating cold water tank after being cooled; a water outlet pipe of the internal rotation sedimentation device is provided with a first electric valve; a liquid level detection device is arranged in the outer cylinder of the internal rotation sedimentation device; a second electric valve is arranged in a slag discharge pipe of the internal rotation sedimentation device; the first electric valve, the second electric valve and the slag level detection device are all electrically connected with the electric cabinet; the internal rotation sedimentation device realizes automatic drainage adjustment through the interlocking control of the electric cabinet on the liquid level detection device and the first electric valve, and realizes automatic slag discharge through the interlocking control on the slag level detection device and the second electric valve.
The invention also provides a treatment process of the granulated circulating water in the granulated circulating water system suitable for the blast furnace granulated slag, which comprises the following steps:
s1, water in the granulation cold water pool flows into the inner cylinder through the water inlet pipe connector arranged at the upper part of the inner cylinder, and fluid is filled in the water inlet pipe through the water level pressure difference; the pipe diameter of the water inlet pipe is controlled to ensure that the flow velocity is in a preset range, and the water flow tangentially enters the inner cylinder for rotational flow;
s2, accelerating precipitation and sediment area precipitation through rotational flow, so that slag particles in water are precipitated in the sediment area, and automatic slag discharge is realized through linkage of a slag level detection device in the sediment area and an electric valve in a slag discharge pipe;
s3, discharging the supernatant in the outer cylinder to a water storage tank through a water outlet pipe arranged at the upper part of the outer cylinder, filling the water outlet pipe with fluid through water level pressure difference, controlling the pipe diameter of the water outlet pipe to enable the flow rate to be within a preset range, and realizing automatic drainage regulation through linkage of a liquid level detection device in the outer cylinder and an electric valve in the water outlet pipe.
Optionally, the inflow velocity of the inner cylinder is 2.5 m/s-4.0 m/s.
Optionally, the flow speed of the effluent of the outer cylinder is 1.0-2.0 m/s.
The invention has the beneficial effects that:
1. the granulated circulating water of the granulated circulating water system of the blast furnace granulated slag is purified and used for supplementing water to the system, so that the external water quantity entering the system is reduced, the water for the system is saved, and the sewage discharge of the system is reduced.
2. The water outlet pipe is designed to be L-shaped, so that the water quality of the water outlet pipe is improved, and the water outlet of the water outlet pipe is facilitated.
3. According to the invention, the water outlet of the water inlet pipe is tangent to the inner wall of the inner cylinder, so that water flows into the central cylinder along the tangential direction, the rotational flow of the water flow is reduced, smaller slag particles are precipitated rapidly under the rotational flow effect, and the purification efficiency of the granulated circulating water is improved.
4. According to the invention, the baffles are arranged in the circumferential direction of the inner cylinder, so that slag particles in the settling area are reduced from entering the upper area of the baffles, and the purification efficiency of the granulated circulating water is improved.
5. According to the invention, the side plate of the slag settling area is designed into an inclined shape with an included angle of not less than 60 degrees with the bottom, so that the slag in the granulating circulating water on the upper part of the baffle plate can sink along the side plate, and the purity of the granulating circulating water can be improved.
6. The automatic valve and the normally open manual valve are arranged in the water inlet pipe, the water outlet pipe and the slag discharge pipe, so that the safety of the system is improved, and the power-off maintenance of the system is facilitated.
7. According to the invention, the first electric valve is arranged on the water outlet pipe, and the liquid level meter interlocked with the first electric valve is arranged in the outer cylinder, so that the automatic control and discharge of the water outlet pipe are realized; the sediment is automatically discharged by arranging the sediment level meter in the sediment area and arranging a second electric valve linked with the sediment level meter in the sediment discharge pipe.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of a granulated circulating water system of blast furnace granulated slag according to the present invention;
FIG. 2 is a first schematic structural diagram of the internal rotation deposition apparatus of the present invention;
fig. 3 is a schematic structural diagram of the internal rotation sedimentation device of the present invention.
Reference numerals: the device comprises a cooling tower 1, a granulation cold water tank 2, a granulation water return tank 3, a water inlet pipe 4, an exhaust pipe 5, an internal rotation precipitation device 6, a water outlet pipe 7, an electric cabinet 8, a slag discharge pipe 9, a water storage tank 10, a rotary drum 11, a third manual valve 12, a third electric valve 13, a water temperature detection device 14, an outer cylinder 15, a liquid level detection device 16, an inner cylinder 17, a first manual valve 18, a first electric valve 19, a baffle 20, a through hole 21, a side plate 22, a slag level detection device 23, a slag precipitation area 24, a second electric valve 25 and a second manual valve 26.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 3, a granulated circulating water system of blast furnace granulated slag is a complete set of equipment, including an internal rotation sedimentation device 6 and its associated equipment and instruments; the internal rotation sedimentation device 6 is a steel closed cylinder and comprises an inner cylinder 17 and an outer cylinder 15 which are coaxial, the inner cylinder 17 is positioned inside the outer cylinder 15, the inner cylinder 17 is communicated with the outer cylinder 15 through a bottom opening, a baffle plate 20 is arranged on the outer side of the bottom of the inner cylinder 17, the baffle plate 20 and the bottom of the outer cylinder 17 enclose a sediment area 24, and a slag discharge pipe 9 is arranged at the bottom of the sediment area 24; the inner cylinder 17 is used for feeding water through the water inlet pipe 4, the outer cylinder 15 is used for discharging water through the water outlet pipe 7, the water feeding flow velocity of the inner cylinder 17 is 2.5-4.0 m/s, the water inlet of the water inlet pipe 4 is higher than the water outlet of the water inlet pipe 4, the gradient i of the water inlet pipe is 0.02-0.03 (the ratio of the height difference of two ends of the pipeline to the length of the pipeline), the water discharging flow velocity of the outer cylinder 15 is 1.0-2.0 m/s, and no gradient exists; the elevation of the water outlet of the water inlet pipe 4 tangent to the inner cylinder 17 is lower than the top plate (1.3-2.0) m of the device, the elevation of the water inlet pipe opening of the water outlet pipe 7 is higher than the elevation of the water inlet pipe 4 tangent to the inner cylinder 17 (0.5-1.0) m, the inlet water comes from the upper water in the granulating cold water tank 2 arranged at the lower part of the cooling tower 1, and the elevation of the top of the device is lower than the overflow water level of the granulating cold water tank 2. The water outlet of the water inlet pipe is tangent to the inner wall of the inner cylinder 17, so that water flows into the inner cylinder 17 along the tangential direction, the water flow whirls and descends and passes through the bottom opening, the inner through pipe 17 is communicated with the outer cylinder 15, smaller slag particles play a role of accelerating precipitation due to whirling and sink to the bottom of the tank, clear liquid is in the upper layer of the outer cylinder 15, the water outlet pipe is arranged on the outer cylinder 15, the slag settling area 24 is in an inverted cone shape, the included angle alpha between the side plate 22 of the slag settling area and the bottom of the slag settling area is not less than 60 degrees, the included angle between the baffle plate 20 arranged at the bottom of the inner cylinder 17 and the side plate 22 of the slag settling area 24 is 80 degrees, the baffle plate 20 arranged at the bottom of the inner cylinder 17 is provided with through holes 21, the diameter of the through holes 21 is 40mm and is uniformly distributed on the baffle plate 20, the distance between adjacent through holes 21 is 100mm, the distance between, an exhaust pipe 5 is arranged at the top of the outer cylinder 15 and communicated with the atmosphere, and the outlet height of the exhaust pipe 5 is higher than the highest water level (200-300) mm of the granulating cold water pool 2.
The internal rotation precipitation device is a steel device, and adopts steel plates including but not limited to common carbon steel plates, stainless steel plates and composite steel plates, wherein the thickness of the steel plates is 6-40 mm. The welding seam has no special requirement, and the current specification and standard are executed.
The water inlet pipe 4 is provided with a third manual valve 12 and a third electric valve 13, the water outlet pipe 7 is provided with a first manual valve 18 and a first electric valve 19, the slag discharge pipe 9 is provided with a second electric valve 25 and a second manual valve 26, the valve types include but are not limited to butterfly valves, ball valves and gate valves, and the manual valves are normally open valves.
The matched instrument is that a liquid level detection device 16 is arranged in an outer cylinder 15, the numerical value of the liquid level detection device is displayed on a liquid crystal display screen of an electric control box 8 arranged in the device and is interlocked with an electric valve of a water outlet pipe, and when the liquid level is lower than a certain set liquid level, a first electric valve 19 in the water outlet pipe 7 is closed; the sediment zone 24 is provided with a sediment level detection device 23, the numerical value of which is displayed on a liquid crystal display screen of an electric cabinet 8 equipped in the device and is interlocked with a second electric valve 26 in the sediment discharge pipe 9, when the sediment level of the sediment zone 24 is lower than a certain set liquid level, the second electric valve 26 in the sediment discharge pipe 9 is closed, and when the sediment level is higher than the certain set liquid level, the second electric valve 26 in the sediment discharge pipe 9 is opened; the water inlet pipe 4 is provided with a water temperature detection device 14, and the numerical value of the water temperature detection device is displayed on a liquid crystal display screen of an electric control box 8 arranged on the device and is used for monitoring the water inlet index of the device. Wherein, the slag level detection device 23 is a liquid level meter, the slag level detection device 23 is a slag level meter, and the water temperature detection device 14 is a thermal resistor.
According to the invention, the first electric valve 19 is arranged on the water outlet pipe 7, and the liquid level meter interlocked with the first electric valve 19 is arranged in the outer cylinder 15, so that the automatic control and discharge of the water outlet pipe 7 are realized; the automatic discharge of the sediment is realized by arranging a sediment level meter in the sediment area 24 and arranging a second electric valve 25 linked with the sediment level meter in the sediment discharge pipe; through set up the manual valve that normally opens on each pipe, not only increased the security of equipment, still do benefit to the outage maintenance of equipment.
The granulating circulating water is purified by the internal rotation sedimentation device 6 and then is sent to a user by a water supply pump, the temperature of the granulating circulating water rises after the user uses the granulating circulating water, the granulating circulating water enters the granulating water return tank 3, the granulating water return tank is lifted by the granulating water return pump, the granulating circulating water enters the cooling tower 1 for cooling and then returns to the granulating cold water tank 2, and the upper water in the granulating cold water tank 2 automatically flows into the internal rotation sedimentation device 6 for treatment and recycling. The water in the granulating cold water tank 2 can flow into the granulating water return tank 3 after reaching the overflow water level.
The treatment process of the granulating circulating water in the granulating circulating water system of the blast furnace granulated slag comprises the following steps:
the upper water in the granulating cold water tank 2 enters the inner cylinder 17 through the water inlet pipe 4 and the inner wall of the inner cylinder 17 in the internal rotation precipitation device 6 in a tangent manner, slag in water is precipitated in a sediment area 24 through rotational flow and a sediment area 24 arranged at the bottom of the outer cylinder 15, then the slag in water enters the outer cylinder 15 through a through hole 21 of a baffle 20 arranged on the inner cylinder 17 and a gap between the baffle and a side plate 22, supernatant in the outer cylinder 15 enters the water storage tank 10 through the water outlet pipe 7, and the water in the water storage tank 10 can be used as cleaning pump source water of the rotary drum 11 or other water of the system. The remote monitoring and unmanned guard are realized by the interlocking of the liquid level detection device 16 arranged in the outer barrel 15 and the first electric valve 19 arranged in the water outlet pipe 7, the interlocking of the slag level detection device 23 arranged in the slag settling area 24 and the second electric valve 25 arranged in the slag discharge pipe 9, and the numerical value of the water temperature detection device 14 arranged in the water inlet pipe 4 as the monitoring of the water inlet index of the device. The precipitation treatment rate of the device can reach more than 80%.
The granulating and circulating water system for the blast furnace granulated slag does not need to supplement external water sources as water for a cleaning pump of the rotary drum 11 according to the traditional method except necessary water supplement of a water tank, can reduce the sewage discharge amount, even realize zero emission, realize the internal water balance of the system and achieve the purposes of water saving and environmental protection.
The purified water obtained by the treatment of the internal rotation precipitation device 6 can be used for, but not limited to, the water for a drum cleaning pump.
Compared with the prior art, the invention forms a complete set of granulating circulating water system of the blast furnace granulated slag, realizes water balance in the granulating circulating water system of the blast furnace granulated slag through the organic combination of the internal rotation sedimentation device 6, the matched equipment and the instrument, and achieves the purposes of water saving and environmental protection.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. An internal rotation precipitation device is characterized in that: the device comprises a closed outer cylinder and an inner cylinder arranged on the inner side of the outer cylinder, wherein the inner cylinder is communicated with the outer cylinder through an opening at the bottom of the inner cylinder;
the bottom of the inner cylinder is provided with an outward extending baffle, a sediment area is defined by the baffle and a side plate at the lower part of the outer cylinder, and the bottom of the sediment area is provided with a slag discharge pipe;
the upper part of the inner barrel is provided with a water inlet pipe, the upper part of the outer barrel is provided with a water outlet pipe, and a water inlet of the water outlet pipe is positioned above a water outlet of the water outlet pipe; along the axial direction of the outer barrel, the water outlet of the water inlet pipe is positioned between the water inlet and the water outlet of the water outlet pipe;
and the top of the outer barrel is provided with an exhaust pipe communicated with the atmosphere.
2. An internal rotation sedimentation device according to claim 1, wherein: the water inlet of the water outlet pipe is funnel-shaped.
3. An internal rotation sedimentation device according to claim 1, wherein: the water outlet of the water inlet pipe is 1.3-2.0 m lower than the top of the outer cylinder.
4. An internal rotation sedimentation device according to claim 1, wherein: the water inlet pipe is tangent to the inner wall of the inner barrel.
5. An internal rotation sedimentation device according to claim 1, wherein: the sediment area is in an inverted cone shape, and the included angle alpha between the side plate of the sediment area and the bottom of the sediment area is more than or equal to 60 degrees.
6. An internal rotation sedimentation device according to claim 1, wherein: the baffle is provided with a plurality of through holes.
7. An internal rotation sedimentation device according to claim 1, wherein: the included angle beta between the baffle and the side plate of the sediment area is 80 degrees.
8. An internal rotation sedimentation device according to claim 1, wherein: and a gap of 100mm-150mm is reserved between the lower edge of the baffle and the side plate of the sediment area.
9. The utility model provides a circulating water system that granulates of blast furnace grain slag, includes cooling tower, pelletization cold water pond, pelletization return water pond, tank and electric cabinet, its characterized in that: further comprising an internal rotation precipitation device according to any one of claims 1 to 8;
a water inlet pipe of the internal rotation sedimentation device is communicated with the granulation cold water tank, the top of the internal rotation sedimentation device is lower than the overflow water level of the granulation cold water tank, and a water outlet pipe of the internal rotation sedimentation device is connected to a user;
the granulating cold water tank is positioned below the cooling tower, granulating circulating water of blast furnace granulated slag firstly enters the granulating cold water tank through the cooling tower, then automatically flows into the internal rotation sedimentation device for treatment and recycling, is discharged to the granulating water return tank after being used by a user, then enters the cooling tower for cooling, and then enters the granulating cold water tank after being cooled;
a water outlet pipe of the internal rotation sedimentation device is provided with a first electric valve;
a liquid level detection device is arranged in the outer cylinder of the internal rotation sedimentation device;
a second electric valve is arranged in a slag discharge pipe of the internal rotation sedimentation device;
the first electric valve, the second electric valve and the slag level detection device are all electrically connected with the electric cabinet; the internal rotation sedimentation device realizes automatic drainage adjustment through the interlocking control of the electric cabinet on the liquid level detection device and the first electric valve, and realizes automatic slag discharge through the interlocking control on the slag level detection device and the second electric valve.
10. A process for treating granulated circulating water in a granulated circulating water system of blast furnace granulated slag according to claim 9, comprising the steps of:
s1, water in the granulation cold water pool flows into the inner cylinder through the water inlet pipe connector arranged at the upper part of the inner cylinder, and fluid is filled in the water inlet pipe through the water level pressure difference; the pipe diameter of the water inlet pipe is controlled to ensure that the flow velocity is in a preset range, and the water flow tangentially enters the inner cylinder for rotational flow;
s2, accelerating precipitation and sediment area precipitation through rotational flow, so that slag particles in water are precipitated in the sediment area, and automatic slag discharge is realized through linkage of a slag level detection device in the sediment area and an electric valve in a slag discharge pipe;
s3, discharging the supernatant in the outer cylinder to a water storage tank through a water outlet pipe arranged at the upper part of the outer cylinder, filling the water outlet pipe with fluid through water level pressure difference, controlling the pipe diameter of the water outlet pipe to enable the flow rate to be within a preset range, and realizing automatic drainage regulation through linkage of a liquid level detection device in the outer cylinder and an electric valve in the water outlet pipe.
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