CN212133105U - Positive-pressure hot-air heat-accumulating type alloy baking device - Google Patents
Positive-pressure hot-air heat-accumulating type alloy baking device Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to a positive pressure hot air heat accumulating type alloy baking device in the field of energy conservation and consumption reduction, wherein a heat exchanger comprises a heat exchanger body, a heat exchanger inlet and a heat exchanger outlet; the outlet of the heat exchanger is provided with a plurality of groups, wherein the outlet of one group of heat exchanger is connected with the inlet of the positive pressure fan through a pipeline, and the outlet of the positive pressure fan is connected with the outlet of the furnace body through a pipeline and led to the air inlet of the bin body; a bypass outlet of the preheating bin body is connected with an inlet of the heat exchanger through a pipeline; the other group of heat exchange outlets are connected with an inlet of a combustion fan through a pipeline, an outlet of the combustion fan is connected with an inlet of the furnace body through a combustion pipeline, and the inlet of the furnace body is also connected with a fuel gas pipeline; air supply ports are also respectively arranged at the positions of the outlets of the heat exchangers; the utility model discloses a can carry out the reutilization to containing hot waste gas, work efficiency is high, can effectually utilize remaining heat, avoids the problem that combustion efficiency is low, can form the closed loop work of whole flow, reduces atmospheric pollution.
Description
Technical Field
The utility model relates to an energy saving and consumption reduction field particularly relates to an alloy baking equipment.
Background
The steel is the basic industry of national economy, under the situation of rapid development of national economy, the yield of crude steel in China is continuously improved in recent years, the annual yield of crude steel in China in 2014 reaches 8.23 hundred million tons, and the export reaches more than 8000 million tons, which is equivalent to the annual yield of crude steel in the United states. The alloy is an important raw material required in a steelmaking process, the moisture content in the alloy directly influences the quality of molten steel and the tapping temperature, and the alloy material is used after being baked, so that the baking is performed for removing moisture and reducing H in the molten steel, the temperature drop of the molten steel in the molten steel adding process can be reduced, and the increase of energy consumption is avoided. This requires that the alloy silo added with the alloy has the function of alloy baking. The alloy baking device commonly used at present is still relatively backward, a hole is arranged at the lower part of an alloy bin and is placed in the alloy bin, and high-temperature flame is used for directly baking the alloy. The baking device has the defects of large alloy temperature difference, nonuniform baking, insufficient gas combustion, serious environmental pollution and the like in the alloy bin, and is easy to extinguish and introduce potential safety hazards of gas leakage. If highly toxic gases such as converter gas, blast furnace gas and the like are used as combustion media, the safety problem is obvious, and more importantly, because the alloy is directly roasted by flame, the alloy material is heated unevenly, the temperature difference is large, the alloy material around the flame is easy to melt and agglomerate, so that the blanking is not smooth, and the alloy material far away from the flame cannot effectively exert heat, so that the moisture in the alloy material cannot be effectively removed.
Among the prior art, application number is 201320008196.X, application date is 2013.01.08's an alloy baking system, including the alloy baking feed bin, still including the hot-blast furnace of taking the nozzle assembly, the air distribution device of being connected with the hot-blast furnace, the air supply arrangement who is connected with the air distribution device to and arrange the annular radiator in the alloy baking feed bin in being connected with air supply arrangement, this utility model heat dissipation capacity is big, and waste heat utilization efficiency is not high moreover, is unfavorable for long-term large-scale using widely.
An iron alloy roasting apparatus and method of roasting having application number 201510501765.8, application date 2015.08.14, comprising: a high-level ferroalloy charging system and ferroalloy; a roaster and an iron alloy receiving hopper; the rail is connected with the high-level ferroalloy feeding system and the ferroalloy receiving hopper, and the ferroalloy roaster is arranged on one side of the rail between the high-level ferroalloy feeding system and the ferroalloy receiving hopper; the movable centralized bucket is controlled to run along the track: receiving materials at a high-position ferroalloy feeding system; after receiving the materials, driving the materials to the side of the iron alloy roaster to bake the iron alloy by the iron alloy roaster; after baking, the iron alloy is driven to an iron alloy receiving hopper to pour out the baked iron alloy; the utility model discloses a work efficiency is low, and work is unstable moreover, brings great trouble when using, the effect of energy saving and consumption reduction that plays that can not be better.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects, the utility model provides a malleation hot-blast heat accumulation formula alloy baking equipment, this utility model can carry out the reutilization to containing hot waste gas, and work efficiency is high, can effectually utilize remaining heat, avoids the problem that combustion efficiency is low, can form the closed loop work of whole flow, reduces atmospheric pollution.
In order to achieve the purpose, the utility model comprises a hot blast stove, a preheating bin and a heat exchanger which are matched with the hot blast stove; the hot blast stove comprises a stove body, a stove body inlet and a stove body outlet, wherein the preheating bin comprises a preheating bin body, and a waste gas outlet, a bypass outlet, a feeding port, a bin body air inlet and a discharge port which are respectively matched with the preheating bin body; the heat exchanger comprises a heat exchanger body, a heat exchanger inlet and a heat exchanger outlet; the outlet of the heat exchanger is provided with a plurality of groups, wherein the outlet of one group of heat exchanger is connected with the inlet of the positive pressure fan through a pipeline, and the outlet of the positive pressure fan is connected with the outlet of the furnace body through a pipeline and led to the air inlet of the bin body; a bypass outlet of the preheating bin body is connected with an inlet of the heat exchanger through a pipeline; the other group of heat exchange outlets are connected with an inlet of a combustion fan through a pipeline, an outlet of the combustion fan is connected with an inlet of the furnace body through a combustion pipeline, and the inlet of the furnace body is also connected with a fuel gas pipeline; and air supplementing ports are also respectively arranged at the positions of the outlets of the heat exchangers.
Preferably, the furnace body is arranged in a cylindrical shape, the furnace body inlet is arranged on one side of the furnace body, the furnace body outlet is arranged on the other side of the furnace body, the furnace body comprises a furnace shell, furnace body refractory materials arranged in the furnace shell, and furnace body reinforcing ribs on the inner side of the furnace shell are uniformly welded; the furnace shell is provided with an explosion-proof valve and a temperature detection device in the furnace, the side surface of the furnace shell is provided with a manhole, and the bottom of the furnace shell is provided with a support frame; and side reinforcing ribs are also arranged on the two sides of the furnace shell in a matching way. The purpose of adopting this scheme is to ensure furnace body work safety, and combustion efficiency is high, is convenient for control and use.
Preferably, the furnace body inlet is provided with a plurality of groups, each group of furnace body inlet is correspondingly provided with a burner, the burner is provided with a flame detection device, each group of burners is correspondingly provided with an ignition device and a normally open fire device, and the included angle between the ignition device and the normally open fire device and the burner is 30-45 degrees; the gas pipeline is connected with a gas system and comprises a gas main pipeline and a plurality of groups of gas branch pipelines, and the gas main pipeline sequentially comprises a gas main pipe stop valve, a gas main pipe drain valve, a gas main pipe nitrogen purging interface, a gas main pipe pressure transmitter, a gas main pipe manual regulating valve and a gas main pipe pneumatic regulating valve; a gas branch check valve and a gas branch regulating valve are arranged on the gas branch pipeline; the combustion-supporting pipelines comprise a main combustion-supporting pipeline and a plurality of groups of combustion-supporting branch pipelines, and the plurality of groups of combustion-supporting branch pipelines are respectively provided with a combustion-supporting branch regulating valve; the combustion-supporting branch pipelines and the gas branch pipelines correspond to each other one by one and are introduced into the inlet of the furnace body through the burner; the scheme is adopted to ensure high combustion efficiency and good combustion effect and ensure higher safety; meanwhile, burnt hot air is quickly discharged and is used as positive pressure circulating air to participate in baking, but does not participate in the combustion process, so that the efficiency can be improved.
Preferably, the combustor comprises a gas shell and a gas pipeline, the combustion shell is arranged in a cylindrical shape, a furnace body inlet flange is arranged at the furnace body inlet in a matching manner, and the gas shell is connected with the furnace body inlet flange; the gas pipeline is introduced into the furnace body through the furnace body inlet flange, and guide vanes are further arranged between the outer wall of the gas pipeline and the inner wall of the furnace body inlet flange and are uniformly distributed in a spiral shape; the combustion-supporting branch pipeline is tangentially connected with the gas pipeline, and the gas branch pipeline is tangentially connected with the gas shell; the purpose of adopting this scheme is to ensure that the gas that gets into in the gas pipeline gets into the inside quick distribution of stove body and goes out, is convenient for burn.
Preferably, the preheating bin body comprises a preheating bin body, an upper conical barrel arranged on the preheating bin body, and a lower conical barrel arranged below the preheating bin body, wherein the lower conical barrel is provided with two layers, and the inner layer of the lower conical barrel is made of a thick stainless steel plate; the bin body air inlet comprises a bin body upper air inlet and a bin body lower air inlet, the bin body upper air inlet is communicated into the preheating bin body, the bin body lower air inlet is communicated into the lower cone barrel, and bin body inlet automatic adjusting valves, bin body inlet manual adjusting valves and bin body inlet temperature measuring devices are respectively arranged at the bin body upper air inlet and the bin body lower air inlet; the feeding port comprises a manual feeding port and a raw material bin automatic discharging port which are respectively arranged at the top of the upper conical barrel, and a pneumatic swing valve is arranged at the raw material bin automatic discharging port; the discharge port is arranged at the bottom of the lower cone barrel and is provided with a discharge valve in a matching way; the preheating bin body is supported by a bin body bracket; the waste gas outlet is connected with a waste gas pipeline through a corrugated compensation pipe, and a waste gas cutter bar gate valve, a waste gas pneumatic regulating valve and a waste gas temperature monitoring device are sequentially arranged on the waste gas pipeline in a matched manner; the bypass outlet is connected with the waste gas pipeline through a three-way pipeline, and a bypass cutter bar gate valve, a bypass pneumatic regulating valve and a bypass circulating air pressure monitoring device are also arranged at the bypass outlet in a matched manner; the aim of adopting the proposal is to ensure high working efficiency and reliable work of the preheating bin body.
Preferably, the preheating bin body is integrally arranged in a cylindrical shape, and a cyclone interlayer is arranged on the preheating bin body; the cyclone interlayer comprises an inner side wall, an outer side wall and spiral ventilating vanes arranged between the inner side wall and the outer side wall, and the spiral ventilating vanes are spirally distributed between the inner side wall and the outer side wall from top to bottom to form a cyclone flow channel; the outer side wall is the outer wall of the preheating bin body, and the inner side is made of stainless steel meshes; the upper air inlet of the bin body is arranged on the position, close to the upper conical barrel, of the preheating bin body, and the outer side wall of the bin body is also provided with a heat insulation material in a matched mode; the purpose of adopting this scheme is to ensure that the alloy to be roasted entering from the upper part can be heated instantly, improve the thermal efficiency, simultaneously ensure that the bottom part can not be damaged, and improve the usability of the equipment.
Preferably, the upper air inlet of the bin body is tangentially connected with the outer side wall, and the spiral ventilating blade of the cyclone flow channel is arranged along the flow direction of the upper air inlet of the bin body and gradually rotates downwards to extend; the spiral ventilating vanes are arranged in two layers side by side; the purpose of adopting this scheme is to ensure that hot-blast can form the whirlwind through spiral ventilation blade and enter the preheating internal of storehouse and carry out the stoving of heating fast to the alloy.
Preferably, the heat exchanger is a regenerative heat exchanger, and the inlets of the heat exchangers on the regenerative heat exchanger are provided with one group, and the outlets of the heat exchangers are provided with two groups; two groups of air supply openings are also arranged corresponding to the outlets of the two groups of heat exchangers; the air supplementing opening is respectively provided with an air volume pneumatic regulating valve and an air volume manual regulating valve, and the outlets of the two groups of heat exchangers are also provided with an outlet pressure monitoring device and an outlet temperature monitoring device in a matching way; the purpose of adopting this scheme is to ensure that heat accumulation formula heat exchanger heat exchange efficiency is high, is convenient for carry out the regulation of the amount of wind moreover, ensures inside safety, prevents simultaneously that the heat from concentrating on positive pressure fan, reduces positive pressure fan's life, can preheat combustion-supporting wind and can improve the combustion efficiency of combustor again.
Preferably, a pipeline connected with an outlet of the positive pressure fan and a pipeline connected with an outlet of the furnace body are provided with tangential joints, the pipeline connected with the outlet of the furnace body is a hot air main pipeline, a hot air lower pipeline is tangentially arranged at the rear section of the tangential joint of the hot air main pipeline and is connected with a lower air inlet of the bin body, and the hot air main pipeline finally enters a hot air upper pipeline through a reducer pipe and is connected with an upper air inlet of the bin body; the diameter of the hot air main pipeline is directly larger than that of the hot air upper pipeline, and the diameter ratio of the hot air upper pipeline to the hot air lower pipeline is 1.8-3: 1; the purpose of adopting this scheme is to adopt the mode of drawing to penetrate into preheating the internal of storehouse with producing hot-blast to toast the upper portion and the lower part of preheating the storehouse respectively, ensure moreover that preheating the storehouse upper portion toasts the temperature and is higher than the lower part toasts the temperature.
Preferably, the inlet and the outlet of the positive pressure fan, and the inlet and the outlet of the combustion-supporting fan are respectively provided with a corrugated compensation pipe; the purpose of adopting this scheme is that the dimensional change that causes such as the thermal expansion and cold contraction of the pipeline, pipe, container convenient absorption line, pipe, container.
The utility model comprises a gas system, a positive pressure system, a circulation system and a hot blast stove combustion-supporting air system;
the gas enters the gas main pipeline through the gas main pipeline stop valve and respectively enters the corresponding gas pipelines from the plurality of groups of gas branch pipelines, and the combustion-supporting gas enters the plurality of groups of combustion-supporting branch pipelines from the combustion-supporting main pipeline and respectively enters the corresponding gas shells;
combustion-supporting gas is pushed by a combustion-supporting fan and forms cyclone through guide vanes, enters the furnace body and is fully mixed with coal gas entering the gas pipeline and sprayed into the furnace body;
after the ignition device and the normally open fire device are ignited, the normally open fire state is kept, and the included angle between the ignition device and the combustor is kept between 30 and 45 degrees, so that the mixed gas is continuously ignited and is fully combusted;
a positive pressure system:
hot air generated after the furnace body burns is injected and pressurized to 8-15Kpa by a positive pressure fan, then enters a hot air main pipeline from a furnace body outlet, one path of hot air enters a preheating bin body through an upper bin body air inlet, and the other path of hot air enters a lower cone barrel through a lower bin body air inlet;
at the moment, a feeding port arranged at the upper conical barrel of the preheating bin body can be used for feeding, and ferrosilicon and ferromanganese alloy are used as raw materials for feeding and baking; controlling the alloy preheating temperature within 600 ℃, wherein each bin is not less than 4t, and the baking time is 30-45 min;
the preheating bin body adopts the form of an upper cone barrel, a preheating bin body and a lower cone barrel, so that the air quantity and the air pressure at the preheating bin body and the lower cone barrel can be independently controlled during control; ensuring that the air pressure of a pipeline at an air inlet on the bin body is 6-12 Kpa and the air inlet temperature is about 750-950 ℃;
in the process that hot air enters the cylindrical preheating bin body through the air inlet on the bin body, the hot air passes through the cyclone interlayer, the hot air entering the cyclone interlayer accounts for 45% -55% of the total hot air quantity and enters the preheating bin body through the inner side wall when entering the cyclone flow channel, so that the temperature of materials entering the feeding port is rapidly increased, and the rest hot air flows along the spiral ventilation blades and gradually enters the preheating bin body to bake descending materials;
the alloy to be baked finally falls into the lower cone barrel, the other path of hot air enters the lower cone barrel through the lower air inlet of the bin body to bake the alloy with irregular shape, and the hot air can flow in the gap between adjacent alloys to prevent the alloys from being bonded together in the baking process; the ratio of hot air passing through the upper air inlet of the bin body to the upper air inlet of the bin body is 1.8-3: 1;
discharging the baked alloy from a discharge valve through a discharge hole in sequence, and extracting preheated hot air from a bypass outlet by a positive pressure fan by using the pressure of-8 to-12 Kpa at an inlet of the positive pressure fan while discharging, wherein the temperature of the extracted hot air is between 450 and 550 ℃;
meanwhile, the waste gas outlet can be connected into a secondary dust removal main pipe, so that the phenomenon that hot air overflows to pollute the working environment is avoided;
a circulating system:
the positive pressure fan extracts preheated hot air from a bypass outlet by using the pressure of minus 8 to minus 12Kpa at the inlet of the positive pressure fan, and the hot air enters the heat accumulating type heat exchanger for sufficient heat exchange and is respectively discharged from the outlets of the two heat exchangers;
the positive pressure fan mixes air from one outlet of the heat accumulating type heat exchanger as circulating air with hot air from the outlet of the furnace body and participates in the alloy baking process again, and meanwhile air can be supplemented through the air supplementing port corresponding to the outlet of the heat accumulating type heat exchanger.
A combustion-supporting air system of the hot blast stove;
the combustion-supporting fan sucks air from the other outlet of the heat accumulating type heat exchanger into a combustion-supporting main pipeline and enters the furnace body for supporting combustion, the air is used as combustion-supporting air required by preheating combustion of the hot blast stove, air can be supplemented through an air supplement port corresponding to the outlet of the hot blast stove, the narrowed reducer pipes are adopted at the combustion-supporting main pipeline and the combustion-supporting pipeline, the pressure of the combustion-supporting air can be increased, and the air is further sprayed into the furnace body.
Drawings
To facilitate understanding by those skilled in the art, the present invention will be further described with reference to the accompanying drawings:
fig. 1 is a three-dimensional perspective view of the present invention viewed from the front obliquely above.
Fig. 2 is a three-dimensional perspective view of the present invention as seen from the rear obliquely above.
Fig. 3 is a partial three-dimensional perspective view of the preheating bin body with the outer wall removed.
FIG. 4 is a three-dimensional view of the whole and the inside of the furnace body.
Fig. 5 is a side three-dimensional perspective view of the present invention.
Fig. 6 is an enlarged view of fig. 5 at the point marked a.
Fig. 7 is a flowchart of the present invention.
Wherein, 1 hot-blast furnace, 2 heat exchangers, 3 preheating bins, 4 furnace inlets, 5 furnace outlets, 6 waste gas outlets, 7 bypass outlets, 8 manual feeding ports, 9 automatic feed ports of raw material bins, 10 discharge ports, 11 discharge valves, 12 combustion-supporting fans, 13 upper inlet ports of bin bodies, 14 lower inlet ports of bin bodies, 15 regenerative heat exchangers, 16 heat exchanger outlets, 17 air supplementing ports, 18 corrugated compensation pipes, 19 explosion-proof valves, 20 positive pressure fans, 21 furnace bodies, 22 supporting racks, 23 manholes, 24 main combustion-supporting pipelines, 25 branch combustion pipelines, 26 heat exchanger inlets, 27 main gas pipelines, 28 branch gas pipelines, 29 reinforcing ribs, 30 refractory materials, 31 lower cone buckets, 32 preheating bin bodies, 33 upper cone buckets, 34 inner side walls, 35 spiral ventilating blades, 36 ignition devices, 37 outer side walls, 38 gas pipelines, 39 guide blades, 40 shells, 41 furnace shells, 42 interlayers of cyclone cyclones, 43 normal open fire devices, 44 cyclone flow channels, 45 tangential joints, 46 hot air main pipelines, 47 hot air upper pipelines, 48 hot air lower pipelines, 49 preheating cabin bodies and 50 gas main pipeline nitrogen purging interfaces.
Detailed Description
As shown in fig. 1-7, in order to achieve the above purpose, the utility model comprises a hot blast stove 1, a preheating bin 3 and a heat exchanger 2 which are arranged in cooperation with the hot blast stove 1; the hot blast stove 1 comprises a stove body 21, a stove body inlet 4 and a stove body outlet 5, and the preheating bin 3 comprises a preheating bin body 32, a waste gas outlet 6, a bypass outlet 7, a feeding port, a bin body air inlet and a discharge port 10 which are respectively matched with the preheating bin body 32; the heat exchanger 2 comprises a heat exchanger body, a heat exchanger inlet 26 and a heat exchanger outlet 16; the heat exchanger outlets 16 are provided with a plurality of groups, wherein one group of heat exchanger outlets 16 are connected with the inlet of the positive pressure fan 20 through a pipeline, and the outlet of the positive pressure fan 20 is connected with the furnace body outlet 5 through a pipeline and led to the bin body air inlet; the bypass outlet 7 of the preheating bin body 32 is connected with the heat exchanger inlet 26 through a pipeline; the other group of heat exchange outlets are connected with the inlet of a combustion fan 12 through a pipeline, the outlet of the combustion fan 12 is connected with a furnace body inlet 4 through a combustion pipeline, and the furnace body inlet 4 is also connected with a fuel gas pipeline 38; and air supplementing ports 17 are also respectively arranged at the positions of the heat exchanger outlets 16.
The furnace body 21 is arranged in a cylindrical shape, the furnace body inlet 4 is arranged on one side of the furnace body 21, the furnace body outlet 5 is arranged on the other side of the furnace body 21, the furnace body 21 respectively comprises a furnace shell 41, furnace body refractory materials 30 arranged in the furnace shell 41, and furnace body reinforcing ribs 29 uniformly welded on the inner side of the furnace shell 41; the furnace shell 41 is provided with an explosion-proof valve 19 and a furnace temperature detection device, the side surface of the furnace shell 41 is provided with a manhole 23, and the bottom of the furnace shell 41 is provided with a support frame 22; the two sides of the furnace shell 41 are also provided with side reinforcing ribs in a matching way.
The furnace body inlet 4 is provided with a plurality of groups, each group of furnace body inlet 4 is correspondingly provided with a burner, the burner is provided with a flame detection device, each group of burners is correspondingly provided with an ignition device 36 and a normally open fire device 43, and the included angle between the ignition device 36 and the normally open fire device 43 and the burner is 30-45 degrees; the gas pipeline 38 is connected with a gas system, the gas pipeline 38 comprises a gas main pipeline 27 and a plurality of groups of gas branch pipelines 28, and the gas main pipeline 27 sequentially comprises a gas main pipeline stop valve, a gas main pipeline drain valve, a gas main pipeline nitrogen purging interface, a gas main pipeline pressure transmitter, a gas main pipeline manual regulating valve and a gas main pipeline pneumatic regulating valve; the gas branch pipeline 28 is provided with a gas branch check valve and a gas branch regulating valve; the combustion-supporting pipelines comprise a combustion-supporting main pipeline 24 and a plurality of groups of combustion-supporting branch pipelines 25, and combustion-supporting branch regulating valves are respectively arranged on the groups of combustion-supporting branch pipelines 25; the combustion-supporting branch pipelines 25 and the gas branch pipelines 28 correspond to each other one by one and are introduced into the furnace body inlet 4 through the burner;
the combustor comprises a gas shell 40 and a gas pipeline 38, the combustion shell is arranged in a cylindrical shape, a furnace body inlet flange is arranged at a furnace body inlet 4 in a matching mode, and the gas shell 40 is connected with the furnace body inlet flange; the gas pipeline 38 is introduced into the furnace body 21 through the furnace body inlet flange, and guide vanes 39 are further arranged between the outer wall of the gas pipeline 38 and the inner wall of the furnace body inlet flange, and the guide vanes 39 are uniformly distributed in a spiral shape; the combustion-supporting branch pipeline 25 is tangentially connected with a gas pipeline 38, and the gas branch pipeline 28 is tangentially connected with a gas shell 40;
the preheating bin body 32 comprises a preheating bin body 49, an upper conical barrel 33 arranged on the preheating bin body 49, and a lower conical barrel 31 arranged below the preheating bin body 49, wherein the lower conical barrel 31 is provided with two layers, and the inner layer of the lower conical barrel 31 is made of a thick stainless steel plate; the bin body air inlet comprises a bin body upper air inlet 13 and a bin body lower air inlet 14, the bin body upper air inlet 13 is communicated into the preheating bin body 49, the bin body lower air inlet 14 is communicated into the lower cone barrel 31, and the bin body upper air inlet 13 and the bin body lower air inlet 14 are respectively provided with a bin body inlet automatic regulating valve, a bin body inlet manual regulating valve and a bin body inlet temperature measuring device; the feeding port comprises an artificial feeding port 8 and a raw material bin automatic feed opening 9 which are respectively arranged at the top of the upper conical barrel 33, and a pneumatic swing valve is arranged at the raw material bin automatic feed opening 9; the discharge hole 10 is arranged at the bottom of the lower cone barrel 31 and is provided with a discharge valve 11 in a matching way; the preheating bin body 32 is supported by a bin body bracket; the waste gas outlet 6 is connected with a waste gas pipeline through a corrugated compensation pipe 18, and a waste gas cutter bar gate valve, a waste gas pneumatic regulating valve and a waste gas temperature monitoring device are sequentially arranged on the waste gas pipeline in a matched manner; the bypass outlet 7 is connected with the waste gas pipeline through a three-way pipeline, and a bypass cutter bar gate valve, a bypass pneumatic regulating valve and a bypass circulating air pressure monitoring device are also arranged at the bypass outlet 7 in a matched manner;
the preheating bin body 49 is integrally arranged in a cylindrical shape, and a cyclone interlayer 42 is arranged on the preheating bin body 49; the cyclone interlayer 42 comprises an inner side wall 34, an outer side wall 37 and a spiral ventilating vane 35 arranged between the inner side wall 34 and the outer side wall, wherein the spiral ventilating vane 35 is spirally distributed between the inner side wall 34 and the outer side wall 37 from top to bottom and forms a cyclone flow channel 44; the outer side wall 37 is the outer wall of the preheating bin body 49, and the inner side is made of stainless steel meshes; the bin body upper air inlet 13 is arranged on the preheating bin body 49 and close to the upper conical barrel 33, and the outer side wall 37 is also provided with a heat insulation material in a matching way;
the upper bin air inlet 13 is tangentially connected with the outer side wall 37, and the spiral ventilating blade 35 of the cyclone flow channel 44 is arranged along the flow direction of the upper bin air inlet 13 and gradually extends downwards in a rotating manner; the spiral ventilating vanes 35 are arranged in two layers side by side;
the heat exchanger 2 is a regenerative heat exchanger 15, a group of heat exchanger inlets 26 on the regenerative heat exchanger 15 is provided, and two groups of heat exchanger outlets 16 are provided; two groups of air supply ports 17 are also arranged corresponding to the two groups of heat exchanger outlets 16; an air quantity pneumatic regulating valve and an air quantity manual regulating valve are respectively arranged at the air supply port 17, and an outlet pressure monitoring device and an outlet temperature monitoring device are also arranged at the outlets 16 of the two groups of heat exchangers in a matched manner;
a pipeline connected with an outlet of the positive pressure fan 20 and a pipeline connected with a furnace body outlet 5 are provided with a tangential connecting part 45, the pipeline connected with the furnace body outlet 5 is a hot air main pipeline 46, a hot air lower pipeline 48 is tangentially arranged at the rear section of the tangential connecting part 45 of the hot air main pipeline 46 and is connected with a lower bin body air inlet 14, and the hot air main pipeline 46 finally enters a hot air upper pipeline 47 through a reducer pipe and is connected with an upper bin body air inlet 13; the diameter of the hot air main pipeline 46 is directly larger than that of the hot air upper pipeline 47, and the diameter ratio of the hot air upper pipeline 47 to that of the hot air lower pipeline 48 is 1.8-3: 1;
the inlet and the outlet of the positive pressure fan 20, and the inlet and the outlet of the combustion-supporting fan 12 are respectively provided with a corrugated compensation pipe 18;
the utility model comprises a gas system, a positive pressure system, a circulation system and a combustion-supporting air system of the hot blast stove 1;
the gas enters the gas main pipeline 27 through the gas main pipeline stop valve and respectively enters the corresponding gas pipelines 38 from the multiple groups of gas branch pipelines 28, and the combustion-supporting gas enters the multiple groups of combustion-supporting branch pipelines 25 from the combustion-supporting main pipeline 24 and respectively enters the corresponding gas shells 40;
combustion-supporting gas is pushed by the combustion-supporting fan 12 and forms a cyclone through the guide vanes 39 to enter the furnace body 21, and the cyclone is fully mixed with coal gas entering the gas pipeline 38 and is sprayed into the furnace body 21;
after the ignition device 36 and the normally open fire device 43 are ignited, the normally open fire state is kept, and the included angle between the normally open fire state and the combustor is kept between 30 and 45 degrees, so that the mixed gas is continuously ignited and is fully combusted;
a positive pressure system:
hot air generated after the furnace body 21 burns is injected and pressurized to 8-15Kpa by the positive pressure fan 20, then enters a hot air main pipeline 46 from a furnace body outlet 5, one path of hot air enters a preheating bin body 49 through a bin body upper air inlet 13, and the other path of hot air enters a lower cone barrel 31 through a bin body lower air inlet 14;
at the moment, a feeding port arranged at the upper conical barrel 33 of the preheating bin body 49 can be used for feeding, and the raw materials for feeding and baking are ferrosilicon and ferromanganese; controlling the alloy preheating temperature within 600 ℃, wherein each bin is not less than 4t, and the baking time is 30-45 min;
the preheating bin body 32 adopts the form of an upper cone bucket 33, a preheating bin body 49 and a lower cone bucket 31, so that the air volume and the air pressure at the preheating bin body 49 and the lower cone bucket 31 can be independently controlled in the control process; ensuring that the air pressure of a pipeline at an upper air inlet 13 of the bin body is 6-12 Kpa and the inlet air temperature is about 750-950 ℃;
in the process that hot air enters the cylindrical preheating bin body 49 through the upper bin body air inlet 13, the hot air passes through the cyclone interlayer 42, the hot air entering the cyclone interlayer 42 accounts for 45% -55% of the total hot air volume, enters the preheating bin body 49 through the inner side wall 34 when entering the cyclone flow channel 44, so that the temperature of materials entering from the feed opening is rapidly increased, and the rest hot air flows along the spiral ventilation blades 35 and gradually enters the preheating bin body 49 to bake the descending materials;
the alloy to be baked finally falls into the lower cone barrel 31, the other path of hot air enters the lower cone barrel 31 through the bin body lower air inlet 14 to bake the alloy with irregular shape, and the hot air can flow in the gap between adjacent alloys, so that the alloys are prevented from being bonded together in the baking process; the ratio of hot air passing through the bin body upper air inlet 13 to hot air passing through the bin body upper air inlet 13 is 1.8-3: 1;
the baked alloy is sequentially discharged from a discharge valve 11 through a discharge hole 10, and when the alloy is discharged, preheated hot air is drawn out from a bypass outlet 7 by a positive pressure fan 20 under the pressure of-8 to-12 Kpa at an inlet of the positive pressure fan, and the temperature of the drawn hot air is between 450 and 550 ℃;
meanwhile, the waste gas outlet 6 can be connected into a secondary dust removal main pipe, so that hot air is prevented from overflowing to pollute the working environment;
a circulating system:
the positive pressure fan 20 extracts preheated hot air from the bypass outlet 7 by using the pressure of-8 to-12 Kpa at the inlet, and the hot air enters the heat accumulating type heat exchanger 15 for sufficient heat exchange and respectively comes out from the outlets 16 of the two heat exchangers;
the positive pressure fan 20 mixes the air from one of the outlets of the heat accumulating type heat exchanger 15 as circulating air with the hot air from the outlet 5 of the furnace body and participates in the alloy baking process again, and meanwhile, the air can be supplemented through the air supplementing port 17 corresponding to the outlet.
The hot blast stove 1 is a combustion-supporting air system;
the combustion-supporting fan 12 sucks air from the other outlet of the heat accumulating type heat exchanger 15 into the combustion-supporting main pipeline 24 and enters the furnace body 21 for supporting combustion, the air is used as combustion-supporting air required by the combustion of the preheating hot blast stove 1, air can be supplemented through the air supplementing opening 17 corresponding to the outlet of the air supplementing fan, the narrowed diameter-variable pipe is adopted at the combustion-supporting main pipeline 24 and the combustion-supporting pipeline, the pressure of the combustion-supporting air can be increased, and the air can be further sprayed into the furnace body 21.
After the completion, nitrogen is introduced into the gas main pipe nitrogen purging interface 50 for nitrogen purging, residual gas in the furnace body 21 is blown out and enters the hot air main pipeline 46 from the furnace body outlet 5, and enters the hot air lower pipeline 48 and the hot upper pipeline 47 through the hot air main pipeline 46 respectively, and finally is discharged from the waste gas outlet 6, so that the whole purging process is completed, and the poisoning of cleaning personnel is avoided.
In the working process, because the hot air generated in the furnace body 21 participates in the combustion once, the hot air is not suitable for participating in the combustion process as the combustion-supporting air again; the system directly takes the air as positive pressure circulating air to participate in the baking process, but does not participate in the combustion process, so that the overall combustion efficiency of the hot blast stove 1 is not reduced, the residual heat of the hot blast stove is efficiently utilized, and the reduction of the combustion efficiency is avoided; and the temperature of the circulating air in the pipeline can be reduced by preheating the combustion-supporting air through the heat accumulating type heat exchanger 15, so that the heat is prevented from being concentrated on the positive pressure fan 20 to reduce the service life of the positive pressure fan 20, and the combustion efficiency of the combustor of the hot blast stove 1 can be improved while the combustion-supporting air is preheated.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications should be considered as the protection scope of the present invention.
Claims (10)
1. A positive-pressure hot-air heat accumulating type alloy baking device is characterized by comprising a hot-blast stove, a preheating bin and a heat exchanger, wherein the preheating bin and the heat exchanger are matched with the hot-blast stove; the hot blast stove comprises a stove body, a stove body inlet and a stove body outlet, wherein the preheating bin comprises a preheating bin body, and a waste gas outlet, a bypass outlet, a feeding port, a bin body air inlet and a discharge port which are respectively matched with the preheating bin body; the heat exchanger comprises a heat exchanger body, a heat exchanger inlet and a heat exchanger outlet; the outlet of the heat exchanger is provided with a plurality of groups, wherein the outlet of one group of heat exchanger is connected with the inlet of the positive pressure fan through a pipeline, and the outlet of the positive pressure fan is connected with the outlet of the furnace body through a pipeline and led to the air inlet of the bin body; a bypass outlet of the preheating bin body is connected with an inlet of the heat exchanger through a pipeline; the other group of heat exchange outlets are connected with an inlet of a combustion fan through a pipeline, an outlet of the combustion fan is connected with an inlet of the furnace body through a combustion pipeline, and the inlet of the furnace body is also connected with a fuel gas pipeline; and air supplementing ports are also respectively arranged at the positions of the outlets of the heat exchangers.
2. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 1, wherein: the furnace body is arranged in a cylindrical shape, the furnace body inlet is arranged on one side of the furnace body, the furnace body outlet is arranged on the other side of the furnace body, the furnace body comprises a furnace shell, furnace body refractory materials arranged in the furnace shell and furnace body reinforcing ribs uniformly welded on the inner side of the furnace shell; the furnace shell is provided with an explosion-proof valve and a temperature detection device in the furnace, the side surface of the furnace shell is provided with a manhole, and the bottom of the furnace shell is provided with a support frame; and side reinforcing ribs are also arranged on the two sides of the furnace shell in a matching way.
3. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 1, wherein: the furnace body inlet is provided with a plurality of groups, each group of furnace body inlet is correspondingly provided with a burner, the burner is provided with a flame detection device, each group of burners is correspondingly provided with an ignition device and a normally open fire device, and the included angle between the ignition device and the normally open fire device and the burner is 30-45 degrees; the gas pipeline is connected with a gas system and comprises a gas main pipeline and a plurality of groups of gas branch pipelines, and the gas main pipeline sequentially comprises a gas main pipe stop valve, a gas main pipe drain valve, a gas main pipe nitrogen purging interface, a gas main pipe pressure transmitter, a gas main pipe manual regulating valve and a gas main pipe pneumatic regulating valve; a gas branch check valve and a gas branch regulating valve are arranged on the gas branch pipeline; the combustion-supporting pipelines comprise a main combustion-supporting pipeline and a plurality of groups of combustion-supporting branch pipelines, and the plurality of groups of combustion-supporting branch pipelines are respectively provided with a combustion-supporting branch regulating valve; the combustion-supporting branch pipelines and the gas branch pipelines correspond to each other one by one and are introduced into the inlet of the furnace body through the burner.
4. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 3, wherein: the combustor comprises a gas shell and a gas pipeline, the combustion shell is arranged in a cylindrical shape, a furnace body inlet flange is arranged at the furnace body inlet in a matching mode, and the gas shell is connected with the furnace body inlet flange; the gas pipeline is introduced into the furnace body through the furnace body inlet flange, and guide vanes are further arranged between the outer wall of the gas pipeline and the inner wall of the furnace body inlet flange and are uniformly distributed in a spiral shape; the combustion-supporting branch pipeline is tangentially connected with the gas pipeline, and the gas branch pipeline is tangentially connected with the gas shell.
5. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 1, wherein: the preheating bin body comprises a preheating bin body, an upper conical barrel arranged on the preheating bin body, and a lower conical barrel arranged below the preheating bin body, wherein the lower conical barrel is provided with two layers, and the inner layer of the lower conical barrel is made of a thick stainless steel plate; the bin body air inlet comprises a bin body upper air inlet and a bin body lower air inlet, the bin body upper air inlet is communicated into the preheating bin body, the bin body lower air inlet is communicated into the lower cone barrel, and bin body inlet automatic adjusting valves, bin body inlet manual adjusting valves and bin body inlet temperature measuring devices are respectively arranged at the bin body upper air inlet and the bin body lower air inlet; the feeding port comprises a manual feeding port and a raw material bin automatic discharging port which are respectively arranged at the top of the upper conical barrel, and a pneumatic swing valve is arranged at the raw material bin automatic discharging port; the discharge port is arranged at the bottom of the lower cone barrel and is provided with a discharge valve in a matching way; the preheating bin body is supported by a bin body bracket; the waste gas outlet is connected with a waste gas pipeline through a corrugated compensation pipe, and a waste gas cutter bar gate valve, a waste gas pneumatic regulating valve and a waste gas temperature monitoring device are sequentially arranged on the waste gas pipeline in a matched manner; the bypass outlet is connected with the waste gas pipeline through a three-way pipeline, and a bypass cutter bar gate valve, a bypass pneumatic regulating valve and a bypass circulating air pressure monitoring device are further arranged at the bypass outlet in a matched mode.
6. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 5, wherein: the preheating bin body is integrally arranged in a cylindrical shape, and a cyclone interlayer is arranged on the preheating bin body; the cyclone interlayer comprises an inner side wall, an outer side wall and spiral ventilating vanes arranged between the inner side wall and the outer side wall, and the spiral ventilating vanes are spirally distributed between the inner side wall and the outer side wall from top to bottom to form a cyclone flow channel; the outer side wall is the outer wall of the preheating bin body, and the inner side is made of stainless steel meshes; an air inlet on the bin body is formed in the position, close to the upper conical barrel, of the preheating bin body, and a heat-insulating material is further arranged on the outer side wall in a matched mode.
7. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 6, wherein: the upper air inlet of the bin body is tangentially connected with the outer side wall, and the spiral ventilating blade of the cyclone flow channel is arranged along the flow direction of the upper air inlet of the bin body and gradually rotates downwards to extend; the spiral ventilating vanes are arranged in two layers side by side.
8. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 1, wherein: the heat exchanger is a heat accumulating type heat exchanger, a group of heat exchanger inlets on the heat accumulating type heat exchanger is arranged, and two groups of heat exchanger outlets are arranged; two groups of air supply openings are also arranged corresponding to the outlets of the two groups of heat exchangers; the air supplementing opening is respectively provided with an air volume pneumatic regulating valve and an air volume manual regulating valve, and the outlets of the two groups of heat exchangers are also provided with an outlet pressure monitoring device and an outlet temperature monitoring device in a matching manner.
9. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 1, wherein: a pipeline connected with an outlet of the positive pressure fan and a pipeline connected with an outlet of the furnace body are provided with tangential joints, the pipeline connected with the outlet of the furnace body is a hot air main pipeline, a hot air lower pipeline is tangentially arranged at the rear section of the tangential joint of the hot air main pipeline and is connected with a lower air inlet of the bin body, and the hot air main pipeline finally enters a hot air upper pipeline through a reducer pipe and is connected with an upper air inlet of the bin body; the diameter of the hot air main pipeline is directly larger than that of the hot air upper pipeline, and the diameter ratio of the hot air upper pipeline to the hot air lower pipeline is 1.8-3: 1.
10. The positive-pressure hot-air heat accumulating type alloy baking device according to claim 1, wherein: and the inlet and the outlet of the positive pressure fan, and the inlet and the outlet of the combustion-supporting fan are respectively provided with a corrugated compensation pipe.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115682655A (en) * | 2022-10-27 | 2023-02-03 | 扬州斯科迪冶金设备有限公司 | Technological process of combined baking and blanking device for silicon, chromium and manganese alloy materials |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115682655A (en) * | 2022-10-27 | 2023-02-03 | 扬州斯科迪冶金设备有限公司 | Technological process of combined baking and blanking device for silicon, chromium and manganese alloy materials |
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