CN110042182B - Automatic lead discharging device for blast furnace bottom - Google Patents
Automatic lead discharging device for blast furnace bottom Download PDFInfo
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- CN110042182B CN110042182B CN201910437236.4A CN201910437236A CN110042182B CN 110042182 B CN110042182 B CN 110042182B CN 201910437236 A CN201910437236 A CN 201910437236A CN 110042182 B CN110042182 B CN 110042182B
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- 238000007599 discharging Methods 0.000 title claims abstract description 88
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 79
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 40
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract 3
- 239000003507 refrigerant Substances 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 17
- 239000011449 brick Substances 0.000 abstract description 8
- 239000000428 dust Substances 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
Abstract
The invention relates to an automatic lead discharging device at the bottom of a blast furnace, which comprises a pressure nitrogen adjusting unit, a compressor unit, a temperature adjusting oven, a heat exchanger, a lead discharging part, an exhaust unit and an air pipe; the pressure nitrogen adjusting unit is used for providing a gas source for a circulating gas supply pipeline and discharging the gas from the gas discharging unit; the compressor unit is used for recycling nitrogen in the air supply pipeline and conveying heat energy; the temperature-adjusting oven is used for heating the inlet air flow; the heat exchanger is used for recovering heat energy of the return air flow and preheating the inlet air flow; the lead discharging component is used for melting solid lead through high-temperature hot air flow and collecting and discharging. The invention can continuously or intermittently operate, so that the lead deposited in the bottom bricks of the blast furnace can be accumulated and discharged, the problems of controllable discharge and collection of the deposited lead in the bottom of the blast furnace are solved, and the rising of the bottom of the blast furnace can be effectively prevented and the smoke harm of lead dust in a cast house can be reduced.
Description
Technical Field
The invention relates to the technical field of metallurgical equipment, in particular to an automatic lead discharging device for a blast furnace bottom.
Background
In the smelting production of the blast furnace, lead in the furnace is enriched because the raw fuel inevitably contains lead components. Lead has low melting point and high specific gravity, most of lead liquid can be deposited at the bottom of a hearth except for a very small part carried away by a gas flow, and part of mixed lead liquid flows out of a taphole together with molten iron, so that the problems of lead dust smoke harm and the like in the front of the hearth are caused. The lead liquid at the bottom of the furnace, or the lead dust and lead liquid at the iron notch and the air port can permeate and descend into the brick joint at the bottom of the furnace in various modes. As the discharge of lead outside the furnace is less, more and more lead is deposited, and finally, the phenomena of floating brick accidents and furnace bottom rising can be caused. Therefore, no matter what raw fuel is consumed by a blast furnace, the bottom lead emission should be considered. Particularly, some blast furnaces of long production ages and those in which a rise in the bottom of the furnace has occurred are more necessary to perform the lead-removing operation.
The method for discharging lead at the bottom of the blast furnace in the prior literature is to arrange lead discharging grooves in the bottom bricks, and the heat of the lead is utilized to flow out in liquid state. The method has the defects that the elevation of the lead tank is difficult to calculate, and the risk of molten iron leakage is too high; too low, the temperature of the lead liquid is insufficient, the sinking distance is insufficient, and the self-flowing lead discharging effect is poor.
Another passive lead discharging method is to drill holes in the furnace shell, and the holes are provided with liquid lead and self-flow; the solid lead is deposited, and the plug coke is heated by air. The method has obvious lead discharging effect, but has few lead discharging points, uncontrollable lead discharging operation, certain risk when the lead liquid flows out, single operation only, and no continuous lead discharging.
Therefore, it is necessary to design a lead discharging device with high safety, controllable lead discharging and wide points and multiple surfaces, which can continuously or intermittently operate so as to discharge deposited lead at the furnace bottom at any time, reduce the smoke harm of lead dust at the furnace front and prevent continuous deterioration of the rising accident of the furnace bottom.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to overcome the defects in the prior art, the invention provides an automatic lead discharging device at the bottom of a blast furnace, so as to smoothly discharge solid or liquid lead deposited in brick joints at the bottom of the blast furnace.
The technical scheme adopted for solving the technical problems is as follows: an automatic lead discharging device at the bottom of a blast furnace comprises a pressure nitrogen adjusting unit, a compressor unit, a temperature adjusting oven, a heat exchanger, a lead discharging part and an exhaust unit which are connected through an air pipe.
The pressure nitrogen adjusting unit is used for providing a gas source for a circulating gas supply pipeline and discharging the gas from the gas discharging unit, the compressor unit realizes the cyclic utilization of nitrogen in the gas supply pipeline to convey heat energy, the temperature adjusting oven is used for heating the gas inlet flow, the heat exchanger is used for recovering heat energy of the gas return flow and preheating the gas inlet flow, and the lead discharging component is provided with a heat pipe which stretches into the bottom of the blast furnace, melts solid lead through high-temperature hot gas flow and collects and discharges.
The pressure nitrogen regulating unit comprises an air inlet interface, a small-flow manual valve, a small-flow rotameter, a large-flow manual valve and a large-flow rotameter; the small-flow manual valve and the small-flow rotameter are connected in series to form a small-flow regulating branch, and the large-flow manual valve and the large-flow rotameter are connected in series to form a large-flow regulating branch; the two regulating branches are connected in parallel to supply a nitrogen source to the medium inlet end of the heat exchanger.
The compressor unit comprises a compressor, an outlet one-way valve, an overflow manual valve, a compressor inlet pressure gauge, a compressor outlet pressure gauge and a compressor inlet temperature gauge; the outlet end of the compressor is connected with one end of an outlet one-way valve, and the other end of the outlet one-way valve is connected with the medium inlet end of the heat exchanger; the inlet end of the compressor is connected to the refrigerant outlet end of the heat exchanger; two ends of the overflow manual valve are communicated with an inlet and an outlet of the compressor; the compressor inlet pressure gauge is connected to the compressor inlet line, the compressor outlet pressure gauge is connected to the compressor outlet line, and the compressor inlet temperature gauge is connected to the compressor inlet line.
The temperature-adjusting oven is provided with a comb-shaped air pipe, the inlet end of the comb-shaped air pipe is connected with the medium outlet end of the heat exchanger, the outlet end of the comb-shaped air pipe is used as a heat supply air pipe to be connected to the lead discharging component, and the temperature of the temperature-adjusting oven is detected by an oven thermometer arranged on the outlet air pipe of the temperature-adjusting oven.
The medium inlet end of the heat exchanger is connected with the outlet end of the compressor, the medium outlet end is connected with the temperature adjusting oven, the refrigerant inlet end is connected with the muffler of the air supply pipeline, and the refrigerant outlet end is connected to the inlet end of the compressor.
The exhaust unit comprises a buffer tank, an exhaust one-way valve and an exhaust interface; one end of the buffer tank is connected to the inlet end of the compressor, the other end of the buffer tank is connected to one end of the exhaust one-way valve, the other end of the exhaust one-way valve is connected to the exhaust interface, and the exhaust interface is communicated with the atmosphere.
The lead discharging component consists of a furnace shell flange piece, a collecting pipe, a heat pipe, a lead discharging bent pipe, an air inlet pipe hand valve and an air outlet pipe hand valve; the furnace shell flange piece is fixed with the furnace shell of the blast furnace, one end of the collecting pipe is fixedly connected with the furnace shell flange piece, the other end of the collecting pipe is fixedly connected with the heat pipe, the lead-discharging bent pipe is fixed on the outer end face of the heat pipe, the heat pipe consists of a flange piece, a stainless steel U-shaped pipe, an air inlet elbow, an air outlet elbow, a temperature measuring hole short pipe and a lead-discharging hole short pipe, the temperature measuring hole short pipe and the lead-discharging hole short pipe are respectively fixedly connected at the vertical position of the front end face of the flange piece, the air inlet elbow and the air outlet elbow are respectively fixedly connected at the horizontal left and right sides of the front end face of the flange piece, the stainless steel U-shaped pipe is fixed on the rear end face of the flange piece and extends into the furnace bottom of the blast furnace, one end of the air inlet pipe hand valve is connected with the air outlet end of the temperature adjusting oven, and the other end of the air inlet pipe hand valve is connected with the air inlet elbow; one end of the exhaust pipe hand valve is connected with the exhaust elbow, and the other end of the exhaust pipe hand valve is connected to the refrigerant inlet end of the heat exchanger.
The lead discharging parts are arranged on three layers of different heights of the blast furnace shell according to elevation distribution, wherein the stainless steel U-shaped pipe comprises a long heat pipe arranged on the middle layer of the furnace shell and a short heat pipe arranged on the upper layer and the lower layer of the furnace shell, each layer of the furnace shell is at least provided with four lead discharging parts, and the inlet ends and the outlet ends of the heat pipes of all the lead discharging parts are communicated through valves.
The air pipe is made of steel pipes, and the outer surface of the air pipe is coated with heat-insulating materials.
The beneficial effects of the invention are as follows: according to the invention, the lead discharging component is buried on the furnace shell, and high-temperature air flow with controllable temperature circulates in the furnace shell, so that lead deposited in the bottom brick of the blast furnace is accumulated and discharged; through reasonably distributing the multi-point lead discharging holes, the discharge of enriched lead in the furnace can be balanced, and the occurrence of malignant accidents such as rising of the furnace bottom, upwarp of the tuyere and the like caused by expansion of the volume in the cycle process of solidification and liquefaction when lead liquid is downwards permeated due to temperature change is prevented; the lead discharging operation can be orderly and controllably, safely and reliably controlled by adjusting the temperature of the circulating hot air flow.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is a process block diagram of the present invention.
Fig. 3 is a front view in central section of the lead removing member of the present invention after installation.
Fig. 4 is a top view of the assembled center section of the lead removing member of the present invention.
Fig. 5 is a schematic elevational view of the furnace shell flange member of the present invention.
Fig. 6 is a schematic left-hand view of the furnace shell flange member of the present invention.
Fig. 7 is a schematic right-hand view of the furnace shell flange member of the present invention.
Fig. 8 is a schematic view of the structure of the collecting pipe according to the present invention.
FIG. 9 is a schematic view of the small flange of the header of the present invention.
FIG. 10 is a schematic view of the large flange of the header of the present invention.
FIG. 11 is a schematic top view of a heat pipe according to the present invention.
FIG. 12 is a schematic diagram of the front view of a heat pipe according to the present invention.
FIG. 13 is a schematic diagram of a left-hand structure of a heat pipe according to the present invention.
Fig. 14 is a schematic right-view structure of the heat pipe according to the present invention.
In the figure: 101. the system comprises an air inlet interface, 102, a small flow manual valve, 103, a small flow rotameter, 104, a large flow manual valve, 105, a large flow rotameter, 106, a compressor outlet pressure gauge, 107, an outlet check valve, 108, a compressor, 109, a compressor inlet pressure gauge, 110, a buffer tank, 111, an exhaust check valve, 112, an exhaust interface, 113, an oven temperature gauge, 114, a temperature regulating oven, 115, an overflow manual valve, 116, a compressor inlet temperature gauge, 117, a gas pipe air return temperature gauge, 118, a heat exchanger, 119, a gas pipe, 120, an air inlet pipe hand valve, 121, a long heat pipe lead discharging component, 122, short heat pipe lead removal component, 123, exhaust pipe hand valve, 201, pressure nitrogen adjustment unit, 202, compressor unit, 203, exhaust unit, 204, lead removal component, 301, lead removal elbow, 302, heat pipe, 303, collection pipe, 304, furnace shell flange component, 305, furnace shell flange component, 402, furnace shell flange component short pipe, 501, collection pipe small flange, 502, collection pipe thick pipe, 503, collection pipe large flange, 504, collection pipe thin pipe, 601, heat pipe flange, 602, air inlet elbow, 603, temperature measurement hole short pipe, 604, lead removal hole short pipe, 605, exhaust elbow, 606, stainless steel U-pipe.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
The automatic lead discharging device at the bottom of the blast furnace as shown in fig. 1 comprises the following operation process flows: the Nitrogen Source (NS) is led in from the air inlet interface 101, the air source is formed by connecting a small-flow manual valve 102 and a small-flow rotameter 103 in series through two paths of parallel regulation branches, one is formed by connecting a large-flow manual valve 104 and a large-flow rotameter 105 in series, then the air source is led to the medium inlet end of a heat exchanger 118, is led out from the medium outlet end of the heat exchanger 118 after heat exchange, enters the inlet end of a temperature-regulating oven 114 through an air pipe 119, and the air pipe 119 absorbs heat of an electric heater in a comb-shaped arrangement in the temperature-regulating oven 114 and is led out to a blast furnace site from the outlet end of the temperature-regulating oven 114 to serve as a heat supply air pipe.
When the hot air supply pipe is connected to each of the long heat pipe lead discharging part 121 and the short heat pipe lead discharging part 122, an air inlet pipe hand valve 120 is installed by opening a hole in the hot air supply pipe. The air flow outlet of each lead discharging component 204 is connected with an exhaust pipe hand valve 123, then is connected to an air return pipe through an opening, the air return pipe is led to the refrigerant inlet end of the heat exchanger 118, then is led out from the refrigerant outlet end of the heat exchanger 118 to the inlet of the buffer tank 110, the outlet of the buffer tank 110 is connected with an exhaust check valve 111, and then is led to the exhaust interface 112, so that nitrogen is discharged to the atmosphere.
In the process flow, the compressor 108 circularly compresses the nitrogen flowing in the air pipe 119, the inlet end of the compressor 108 is connected with the refrigerant outlet end of the heat exchanger 118, the outlet end of the compressor is connected with the medium inlet end of the heat exchanger 118 through the outlet check valve 107, and when the compressor 108 operates, the large-flow manual valve 104 can be closed, and the small-flow manual valve 102 is only used for adjusting to a certain opening degree so as to supplement the dissipation of the nitrogen in the circulation pipeline.
Meanwhile, an overflow manual valve 115 is connected in parallel between the inlet end and the outlet end of the compressor 108, the load supply capacity of the compressor 108 is adjusted through the opening degree of the overflow manual valve 115, and when the compressor 108 does not operate, the system can be subjected to heat-carrying circulation by adjusting the opening degree of the large-flow manual valve 104 and using more air source nitrogen.
In addition, a compressor inlet pressure gauge 109 and a compressor inlet temperature gauge 116 are provided at the inlet end of the compressor 108, and a compressor outlet pressure gauge 106 is provided at the outlet end of the compressor 118; an oven thermometer 113 is provided on the outlet air pipe of the temperature adjusting oven 114, and an air pipe return air thermometer 117 is provided on the air pipe of the refrigerant inlet end of the heat exchanger 118.
Referring to fig. 2, a simple process block diagram of the present invention is shown, in which a pressure nitrogen adjusting unit 201 is responsible for supplying nitrogen to a system, a compressor unit 202 is responsible for circulating nitrogen in a system air pipe, an exhaust unit 203 is responsible for exhausting redundant nitrogen in the system air pipe to the atmosphere, a heat exchanger 118 is used for recovering residual heat of a return air flow, the heat exchanger 118 comprises two channels and four interfaces, a medium channel comprises an inlet end AI and an outlet end AO, a refrigerant channel comprises an inlet end BI and an outlet end BO, nitrogen is supplied at a low circulation temperature in the medium channel, and returned nitrogen at a high circulation temperature in the refrigerant channel exchanges heat with each other. The low-temperature nitrogen flows in from the medium inlet end of the heat exchanger 118, flows out from the medium outlet end after being preheated, enters the temperature-adjusting oven 114 for secondary heating, is heated to the target temperature set by the electric heater, is supplied to the heat pipe 302 component in the on-site lead discharging component 204, has higher temperature of the return air nitrogen flow of the lead discharging component 204, is led to the refrigerant inlet end of the heat exchanger 118, has reduced temperature after heat exchange, is led out from the refrigerant outlet end of the heat exchanger 118, and enters the compressor inlet of the compressor unit 202 or is discharged to the atmosphere from the exhaust unit 203.
Referring to fig. 3 and 4, a central sectional view of the lead removing member 204 is shown after being mounted on the blast furnace body, wherein the lead removing member comprises a furnace shell flange 304, a collecting pipe 303, a heat pipe 302, a lead removing elbow 301, an air inlet pipe hand valve 120 and an air outlet pipe hand valve 123.
The short pipe of the furnace shell flange member 304 is inserted and welded in the hole on the furnace shell 305, the collecting pipe 303 is fixedly connected with the flange of the furnace shell flange member 304 through a flange plate with heat insulation measures, and when the collecting pipe 303 is installed, heat insulation materials need to be filled in the short pipe of the furnace shell flange member 304 in advance so as to prevent lead liquid from penetrating and communicating the collecting pipe 303 and the furnace shell flange member 304, thereby radiating heat from the furnace shell 305. The collecting pipe 303 comprises a large flange, a small flange, a thick short pipe and a thin short pipe, wherein the thin pipe is welded on one side of the large flange, the large flange is connected with the furnace shell flange 304, the thin pipe is positioned at the center of the short pipe of the furnace shell flange 304, and when heat insulation measures are taken, lead liquid flows out from the thin pipe and cannot contact with the furnace shell 305 and the furnace shell flange 304. The other side of the large flange of the collecting pipe 303 is welded with a thick short pipe, the other side of the thick short pipe is welded with a small flange, and the thick short pipe can serve as a small storage tank for lead liquid. The heat pipe 302 mainly comprises a small flange and a pipe fitting, four flow holes are formed in the flange, a reserved pipe of a temperature measuring element is welded on the upper side of each vertical hole (see fig. 3), a short pipe 604 of a lead discharging hole is welded on the lower side of each vertical hole, a stainless steel U-shaped pipe 606 is welded on one end of each horizontal hole (see fig. 4), and an air inlet bent pipe 602 and an air outlet bent pipe 605 are welded on the other end of each horizontal hole.
Fig. 5 to 7 show schematic structural views of the furnace shell flange 304. The furnace shell flange 304 consists of a DN100 flange piece and a DN100 steel pipe with a length of 20 cm. Furnace shell flange member flange 401 is centrally apertured and furnace shell flange member stub 402 is plug welded. 6 bolt holes with the diameter of 22 mm are formed in the flange, and M14 bolts are matched. The M14 bolt is matched with a heat insulation sleeve, a heat insulation gasket and a non-standard metal pad, and the flange is additionally matched with the heat insulation gasket with the thickness of more than 4 mm.
Fig. 8 to 10 are schematic structural views of the collection tube 303. The collection tube 303 consists of a large DN100 flange, a small DN80 flange, a thin DN25 steel tube 24 cm long, and a thick DN80 steel tube 10 cm long. The center of the large flange 503 of the collecting pipe is provided with a hole, and a thin collecting pipe 504 is inserted and welded. The other side of the large collecting pipe flange 503 is welded with a large collecting pipe 502, the other side of the large collecting pipe 502 is inserted and welded with a small collecting pipe flange 501, and 4M 14 bolt holes are formed in the small collecting pipe flange 501.
Fig. 11 to 14 show schematic structural diagrams of the heat pipe 302. The heat pipe 302 is composed of a heat pipe flange 601 of DN80, a stainless steel U-shaped pipe 606 with an outer diameter of 8 mm, a DN15 air inlet elbow 602, a DN15 air outlet elbow 605, a DN15 temperature measuring hole short pipe 603 and a DN15 lead discharging hole short pipe 604. Four holes are uniformly distributed on the circumference of the radius 26 mm of the heat pipe flange 601, the diameters of two vertical holes are 15 mm, one of the diameters of two horizontal holes is 9 mm, and the other is 3 mm. A temperature measuring hole short pipe 603 is inserted and welded in an upper hole of one side of the heat pipe flange 601, which is perpendicular to two holes and is used for connecting a temperature measuring element, and the heat pipe flange is sealed by a plug when not measuring temperature; a lower hole plug welding lead discharging hole short pipe 604 of the two vertical holes is used for connecting the lead discharging bent pipe 301; the two horizontal holes are respectively welded with an air inlet elbow 602 and an air outlet elbow 605 at the side of a lead discharge short pipe 604, the other side of the heat pipe flange 601 is welded with a stainless steel U-shaped pipe 606, the stainless steel U-shaped pipe 606 is divided into two types in length, namely a long heat pipe and a short heat pipe, the length of the long heat pipe is about 2 meters, and the length of the short heat pipe is about 1 meter; the lead discharging bent pipe 301 is a DN15 bent pipe with a U-shaped loop, one end of the lead discharging bent pipe 301 is in threaded connection with a lead discharging hole short pipe 604, the other end of the lead discharging bent pipe 301 is provided with a conical nozzle, and when the lead discharging bent pipe 301 is installed, the nozzle is arranged downwards, and the diameter of a nozzle opening is 2 mm; one end of the air inlet pipe hand valve 120 is connected with a heat supply air pipe, and the other end is connected with an air inlet elbow 602 of the heat pipe 302; one end of the exhaust pipe hand valve 123 is connected with an exhaust elbow 605 of the heat pipe 302, and the other end is connected with an air return pipe.
When high-temperature nitrogen is flowed into the stainless steel U-shaped pipe 606, lead liquid flows into the thick pipe of the collecting pipe 303 along the stainless steel U-shaped pipe 606 to accumulate, and when the temperature of the lead-discharging bent pipe 301 connected with the lead-discharging hole short pipe 604 exceeds the melting point of lead, the lead liquid is discharged outwards from the lead-discharging bent pipe 301.
When the lead discharging device works, nitrogen is selected as a working medium so as to improve explosion-proof safety measures. The compressor 108 is cycled as a nitrogen-saving operation mode, and nitrogen is additionally continuously supplied through the small-flow rotameter 103 when the compressor 108 is operated so as to prevent negative pressure from sucking air; when the compressor 108 fails and cannot operate, nitrogen is continuously supplied through the high-flow rotameter 105 so as to ensure continuous heat supply; when the flow rate of the compressor 108 is larger than the flow rate of all parts of the device, the overflow manual valve 115 is used for adjusting the return air temperature, and when the flow rate of the compressor 108 is insufficient, the pressure nitrogen adjusting unit 201 is used for increasing the nitrogen supply; excess nitrogen overflows into the air from the air line connector slit and the exhaust unit 203; the nitrogen flow and overflow manual valve 115 are adjusted to maintain the supply line at a positive pressure and the return line temperature within the allowable range of the compressor 108.
The temperature-adjusting oven 114 has two operation modes when in operation: 1. the lead liquid is collected in a low-temperature cycle, at the moment, the temperature is set at about 350 ℃, solid lead is blocked in the nozzle of the lead discharging bent pipe 301 due to insufficient heat conduction, and the heat pipe 302 slowly melts and adsorbs the lead in the brick joint at the bottom of the furnace in the low-temperature cycle and fills the space where the heat pipe 302 is positioned; 2. periodically and circularly discharging lead liquid at high temperature, wherein the temperature is set at about 450 ℃, a container is hung below the lead discharging elbow 301, part of water is contained, the temperature of the lead discharging elbow 301 is increased to be higher than the melting point of lead by high-temperature conduction or an additional heating method, at the moment, when the pressure in a blast furnace permeates through a brick joint, the lead liquid flows out from a nozzle of the lead discharging elbow 301, water is cooled in the container, and lead wires are automatically formed when the lead liquid quantity is large; after the lead liquid is discharged, the heat supply is stopped for a period of time, the lead discharging bent pipe 301 is naturally cooled, residual lead left in the nozzle and the lead discharging bent pipe 301 is solidified, a lead discharging channel is blocked, and then a low-temperature circulation lead liquid collecting mode is continuously carried out.
According to the invention, a plurality of holes are drilled at proper heights and point positions below the hearth part of the blast furnace, the lead discharging part 204 is buried, the lead discharging part 204 comprises a circulating air pipe, and high-temperature nitrogen flow with controllable circulating temperature is circulated, so that solid molten lead in the furnace is melted and accumulated to the lead discharging part 204, and is discharged and collected from the lead discharging holes at regular intervals.
In order to save energy consumption, the lead discharging component 204 can be used for supplying heat or absorbing heat, and the extracted heat can be supplied to other low-temperature lead discharging components 204 again through circulation of air flow, so that a part of electricity consumption can be saved when electric energy is used for assisting heat.
The lead discharging component 204 can be in a state of slowly collecting lead liquid or rapidly discharging lead outwards by adjusting the temperature of the circulating air flow, so that the lead discharging of the furnace bottom is automatically controllable.
The air flow is circulated through the compressor 108 and the electric auxiliary heat is added on the air supply side, and the heat energy is recovered by the heat exchanger on the air return side, so that the energy utilization rate of the device is maximized.
The recycle gas stream is nitrogen to prevent the leakage of the lead removal member 204, and air circulation is used to present an explosion hazard. Also, nitrogen is typically the pressure source, and when the compressor 108 is not operating, external heat may also be continuously supplied to the lead removal member 204 by increasing the flow of nitrogen.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (5)
1. An automatic lead discharging device at the bottom of a blast furnace is characterized in that: the device comprises a pressure nitrogen adjusting unit, a compressor unit, a temperature adjusting oven, a heat exchanger, a lead discharging component and an exhaust unit, wherein the pressure nitrogen adjusting unit is connected with the air pipe, the pressure nitrogen adjusting unit is used for providing an air source for a circulating air supply pipeline and discharging the air source from the exhaust unit, the compressor unit is used for realizing the recycling of nitrogen in the air supply pipeline to convey heat energy, the temperature adjusting oven is used for heating an air inlet air flow, the heat exchanger is used for recycling heat energy of the air return air flow and preheating the air inlet air flow, and the lead discharging component is provided with a heat pipe which stretches into the bottom of a blast furnace, melts solid lead through high-temperature hot air flow and collects and discharges;
the compressor unit comprises a compressor, an outlet one-way valve, an overflow manual valve, a compressor inlet pressure gauge, a compressor outlet pressure gauge and a compressor inlet temperature gauge; the outlet end of the compressor is connected with one end of an outlet one-way valve, and the other end of the outlet one-way valve is connected with the medium inlet end of the heat exchanger; the inlet end of the compressor is connected to the refrigerant outlet end of the heat exchanger; two ends of the overflow manual valve are communicated with an inlet and an outlet of the compressor; the compressor inlet pressure gauge is connected to the compressor inlet pipeline, the compressor outlet pressure gauge is connected to the compressor outlet pipeline, and the compressor inlet temperature gauge is connected to the compressor inlet pipeline;
the temperature-adjusting oven is provided with a comb-shaped air pipe, the inlet end of the comb-shaped air pipe is connected with the medium outlet end of the heat exchanger, the outlet end of the comb-shaped air pipe is used as a heat supply air pipe to be connected to the lead discharging component, and the temperature of the temperature-adjusting oven is detected by an oven thermometer arranged on the air pipe at the outlet of the temperature-adjusting oven;
the medium inlet end of the heat exchanger is connected with the outlet end of the compressor, the medium outlet end is connected with the temperature adjusting oven, the refrigerant inlet end is connected with the muffler of the air supply pipeline, and the refrigerant outlet end is connected to the inlet end of the compressor.
2. The automatic lead discharging device for the bottom of a blast furnace according to claim 1, wherein: the pressure nitrogen regulating unit comprises an air inlet interface, a small-flow manual valve, a small-flow rotameter, a large-flow manual valve and a large-flow rotameter; the small-flow manual valve and the small-flow rotameter are connected in series to form a small-flow regulating branch, and the large-flow manual valve and the large-flow rotameter are connected in series to form a large-flow regulating branch; the two regulating branches are connected in parallel to supply a nitrogen source to the medium inlet end of the heat exchanger.
3. The automatic lead discharging device for the bottom of a blast furnace according to claim 1, wherein: the exhaust unit comprises a buffer tank, an exhaust one-way valve and an exhaust interface; one end of the buffer tank is connected to the inlet end of the compressor, the other end of the buffer tank is connected to one end of the exhaust one-way valve, the other end of the exhaust one-way valve is connected to the exhaust interface, and the exhaust interface is communicated with the atmosphere.
4. The automatic lead discharging device for the bottom of a blast furnace according to claim 1, wherein: the lead discharging component consists of a furnace shell flange piece, a collecting pipe, a heat pipe, a lead discharging bent pipe, an air inlet pipe hand valve and an air outlet pipe hand valve; the furnace shell flange piece is fixed with the furnace shell of the blast furnace, one end of the collecting pipe is fixedly connected with the furnace shell flange piece, the other end of the collecting pipe is fixedly connected with the heat pipe, the lead-discharging bent pipe is fixed on the outer end face of the heat pipe, the heat pipe consists of a flange piece, a stainless steel U-shaped pipe, an air inlet elbow, an air outlet elbow, a temperature measuring hole short pipe and a lead-discharging hole short pipe, the temperature measuring hole short pipe and the lead-discharging hole short pipe are respectively fixedly connected at the vertical position of the front end face of the flange piece, the air inlet elbow and the air outlet elbow are respectively fixedly connected at the horizontal left and right sides of the front end face of the flange piece, the stainless steel U-shaped pipe is fixed on the rear end face of the flange piece and extends into the furnace bottom of the blast furnace, one end of the air inlet pipe hand valve is connected with the air outlet end of the temperature adjusting oven, and the other end of the air inlet pipe hand valve is connected with the air inlet elbow; one end of the exhaust pipe hand valve is connected with the exhaust elbow, and the other end of the exhaust pipe hand valve is connected to the refrigerant inlet end of the heat exchanger.
5. The automatic lead discharging device for the bottom of a blast furnace according to claim 1, wherein: the air pipe is made of steel pipes, and the outer surface of the air pipe is coated with heat-insulating materials.
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| CN201910437236.4A CN110042182B (en) | 2019-05-24 | 2019-05-24 | Automatic lead discharging device for blast furnace bottom |
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| CN110042182B true CN110042182B (en) | 2023-12-26 |
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| JP2001208318A (en) * | 1996-09-20 | 2001-08-03 | Sumitomo Metal Ind Ltd | Gasification melting furnace for waste and therefor |
| CN201785415U (en) * | 2010-09-03 | 2011-04-06 | 石欣 | Automatic lead discharging device |
| CN201793602U (en) * | 2010-09-17 | 2011-04-13 | 唐利中 | Novel fully-closed lead discharge tank for blast-furnace bottom |
| CN104401736A (en) * | 2014-10-20 | 2015-03-11 | 无锡红旗除尘设备有限公司 | Lead powder and nitrogen gas closed-cycle static-pressure dense-phase sectional boosting pneumatic conveying system |
| CN208427714U (en) * | 2018-06-30 | 2019-01-25 | 中国船舶重工集团衡远科技有限公司 | Lead acid accumulator plate grid continuous casting cover half |
| CN209906817U (en) * | 2019-05-24 | 2020-01-07 | 中天钢铁集团有限公司 | Automatic lead discharging device at bottom of blast furnace |
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2019
- 2019-05-24 CN CN201910437236.4A patent/CN110042182B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001208318A (en) * | 1996-09-20 | 2001-08-03 | Sumitomo Metal Ind Ltd | Gasification melting furnace for waste and therefor |
| CN201785415U (en) * | 2010-09-03 | 2011-04-06 | 石欣 | Automatic lead discharging device |
| CN201793602U (en) * | 2010-09-17 | 2011-04-13 | 唐利中 | Novel fully-closed lead discharge tank for blast-furnace bottom |
| CN104401736A (en) * | 2014-10-20 | 2015-03-11 | 无锡红旗除尘设备有限公司 | Lead powder and nitrogen gas closed-cycle static-pressure dense-phase sectional boosting pneumatic conveying system |
| CN208427714U (en) * | 2018-06-30 | 2019-01-25 | 中国船舶重工集团衡远科技有限公司 | Lead acid accumulator plate grid continuous casting cover half |
| CN209906817U (en) * | 2019-05-24 | 2020-01-07 | 中天钢铁集团有限公司 | Automatic lead discharging device at bottom of blast furnace |
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| CN110042182A (en) | 2019-07-23 |
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