A positive pressure hot air heat storage alloy baking device

Abstract

The present invention relates to a positive-pressure hot-air heat storage alloy baking device in the field of energy conservation and consumption reduction, wherein the heat exchanger comprises a heat exchanger body, a heat exchanger inlet and a heat exchanger outlet; the heat exchanger outlet is provided with several groups, wherein one group of heat exchanger outlets is connected with the inlet of a positive-pressure fan through a pipeline, the outlet of the positive-pressure fan is connected with the outlet of a furnace body through a pipeline and leads to the air inlet of a bin body; the bypass outlet of the preheating bin body is connected with the inlet of the heat exchanger through a pipeline; another group of heat exchanger outlets is connected with the inlet of a combustion-supporting fan through a pipeline, the outlet of the combustion-supporting fan is connected with the inlet of the furnace body through a combustion-supporting pipeline, and the inlet of the furnace body is also connected with a gas pipeline; air supply ports are respectively provided at the outlets of the heat exchanger; the invention can recycle the hot exhaust gas, has high working efficiency, can effectively utilize the residual heat, avoid the problem of low combustion efficiency, can form a closed-loop operation of the entire process, and reduce pollution to the atmosphere.

Description

Technical Field

[0001] The invention relates to the field of energy saving and consumption reduction, and in particular to an alloy baking device. Background Art

[0002] Steel is the basic industry of the national economy. With the rapid development of the national economy, my country's crude steel output has been increasing in recent years. In 2014, my country's annual crude steel output reached 823 million tons, and exports will reach more than 80 million tons, equivalent to the annual crude steel output of the United States. Alloy is an important raw material required in the steelmaking process. The moisture content in the alloy directly affects the quality of the molten steel and the tapping temperature. The alloy material is baked before use. On the one hand, the baking function is to remove moisture and reduce H in the molten steel. On the other hand, it can reduce the temperature drop of the molten steel during the addition of molten steel to avoid increasing energy consumption. Therefore, in recent years, the alloy baking process has been widely used in the steel smelting process, which plays an important role in improving the quality of finished steel products and reducing smelting costs. This requires that the alloy silo for adding alloys has the function of alloy baking. The commonly used alloy baking device is still relatively backward. The lower part of the alloy silo is opened and placed in the alloy silo, and the alloy is directly baked by high-temperature flame. Such a baking device leads to defects such as large temperature difference of alloy in alloy silo, uneven baking, incomplete gas combustion, serious environmental pollution, etc., and is prone to flameout, which introduces safety hazards of gas leakage. If highly toxic gases such as converter gas and blast furnace gas are used as combustion media, the safety problem becomes more prominent. More importantly, since the flame directly bakes the alloy, the alloy material is heated unevenly and the temperature difference is large. The alloy material around the flame is easy to melt and agglomerate, resulting in poor feeding, and the alloy material far away from the flame cannot be effectively heated, so the moisture in it cannot be effectively removed.

[0003] In the prior art, there is an alloy baking system with application number 201320008196.X and application date 2013.01.08, which includes an alloy baking silo, a hot air furnace with a burner assembly, an air distribution device connected to the hot air furnace, an air supply device connected to the air distribution device, and an annular radiator connected to the air supply device and placed in the alloy baking silo. The utility model has a large heat dissipation capacity and a low waste heat utilization efficiency, which is not conducive to long-term large-scale promotion and use.

[0004] A ferroalloy baking equipment and baking method with application number 2015101765.8 and application date 2015.08.14, comprising: a high-level ferroalloy feeding system, a ferroalloy; a baker and a ferroalloy receiving hopper; a track connecting the high-level ferroalloy feeding system and the ferroalloy receiving hopper, and a ferroalloy baker arranged on one side of the track between the high-level ferroalloy feeding system and the ferroalloy receiving hopper; a mobile concentrated bucket is controlled to travel along the track: receiving materials at the high-level ferroalloy feeding system; after receiving the materials, the mobile concentrated bucket travels to the ferroalloy baker side to bake the ferroalloy by the ferroalloy baker; after baking, the mobile concentrated bucket travels to the ferroalloy receiving hopper to pour out the baked ferroalloy; the invention has low working efficiency and unstable operation, which brings great troubles when used and cannot better achieve the effect of energy saving and consumption reduction. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention provides a positive-pressure hot air heat storage alloy baking device, which can recycle the hot exhaust gas, has high working efficiency, can effectively utilize the residual heat, avoid the problem of low combustion efficiency, and can form a closed-loop operation of the entire process to reduce pollution to the atmosphere.

[0006] To achieve the above-mentioned purpose, the present invention includes a hot blast furnace, a preheating bin and a heat exchanger arranged in conjunction with the hot blast furnace; the hot blast furnace includes a furnace body, a furnace body inlet and a furnace body outlet, the preheating bin includes a preheating bin body, an exhaust gas outlet, a bypass outlet, a feeding port, a bin body air inlet and a discharge port respectively arranged in conjunction with the preheating bin body; the heat exchanger includes a heat exchanger body, a heat exchanger inlet and a heat exchanger outlet; the heat exchanger outlet is provided with several groups, one group of heat exchanger outlets is connected to the inlet of a positive pressure fan through a pipeline, the outlet of the positive pressure fan is connected to the furnace body outlet through a pipeline and leads to the bin body air inlet; the bypass outlet of the preheating bin body is connected to the heat exchanger inlet through a pipeline; another group of heat exchanger outlets is connected to the inlet of a combustion-supporting fan through a pipeline, the outlet of the combustion-supporting fan is connected to the furnace body inlet through a combustion-supporting pipeline, and the furnace body inlet is also connected to a gas pipeline; air supply ports are also provided at the positions of the heat exchanger outlets.

[0007] Preferably, the furnace body is cylindrical, the furnace inlet is arranged on one side of the furnace body, the furnace outlet is arranged on the other side of the furnace body, the furnace body includes a furnace shell, a furnace refractory material arranged in the furnace shell, and furnace body reinforcement ribs are evenly welded inside the furnace shell; an explosion-proof valve and a furnace temperature detection device are arranged on the furnace shell, a manhole is arranged on the side of the furnace shell, and a support frame is arranged at the bottom of the furnace shell; side reinforcement ribs are also arranged on both sides of the furnace shell. The purpose of adopting this scheme is to ensure the safety of the furnace body, high combustion efficiency, and easy control and use.

[0008] Preferably, the furnace inlet is provided with several groups, each group of furnace 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 flame device, and the angle between the ignition device and the normally open flame device and the burner is between 30° and 45°; the gas pipeline is connected to the gas system, the gas pipeline includes a gas main pipeline and multiple groups of gas branch pipelines, the gas main pipeline sequentially includes a gas main shut-off valve, a gas main drain valve, a gas main nitrogen purge interface, a gas main pressure transmitter, a gas main manual regulating valve and a gas main gas dynamic regulating valve; a gas branch check valve and a gas branch regulating valve are installed on the gas branch pipeline; the combustion-supporting pipeline includes a combustion-supporting main pipeline and several groups of combustion-supporting branch pipelines, and several groups of combustion-supporting branch pipelines are respectively provided with combustion-supporting branch regulating valves; the combustion-supporting branch pipelines and the gas branch pipelines correspond to each other one by one and are introduced into the furnace body inlet through the burner; the purpose of adopting this scheme is to ensure high combustion efficiency and good combustion effect, while ensuring high safety; at the same time, the hot air that has been burned is quickly discharged, and it is used as positive pressure circulating air to participate in baking, but does not participate in the combustion process, which can improve efficiency.

[0009] Preferably, the burner includes a gas shell and a gas pipeline, the combustion shell is cylindrical, a furnace inlet flange is provided at the furnace inlet, and the gas shell and the furnace inlet flange are connected together; the gas pipeline is introduced into the furnace body through the furnace inlet flange, and guide vanes are provided between the outer wall of the gas pipeline and the inner wall of the furnace inlet flange, and the guide vanes are spirally evenly distributed; the combustion-supporting branch pipeline is tangentially connected to the gas pipeline, and the gas branch pipeline is tangentially connected to the gas shell; the purpose of adopting this scheme is to ensure that the gas entering the gas pipeline will only be quickly dissipated after entering the furnace body, so as to facilitate combustion.

[0010] Preferably, the preheating bin body includes a preheating bin body, an upper cone barrel arranged above the preheating bin body, and a lower cone barrel arranged below the preheating bin body, the lower cone barrel is provided with a double layer, and the inner layer of the lower cone barrel is made of a thick stainless steel plate; the bin body air inlet includes an upper bin body air inlet and a lower bin body air inlet, the upper bin body air inlet leads to the interior of the preheating bin body, and the lower bin body air inlet leads to the lower cone barrel, and the upper bin body air inlet and the lower bin body air inlet 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 includes a manual feeding port and a raw material bin automatic unloading port respectively provided at the top of the upper cone barrel The automatic unloading port of the raw material bin is provided with a pneumatic swing valve; the discharge port is provided at the bottom of the lower cone barrel and is provided with a discharge valve; the preheating bin body is supported by a bin body bracket; the exhaust gas outlet is connected to the exhaust gas pipe through a corrugated compensation pipe, and the exhaust gas pipe is provided with an exhaust gas knife rod gate valve, an exhaust gas pneumatic regulating valve and an exhaust gas temperature monitoring device in sequence; the bypass outlet is connected to the exhaust gas pipe through a three-way pipe, and the bypass outlet is also provided with a bypass knife rod gate valve, a bypass pneumatic regulating valve and a bypass circulating air pressure monitoring device; the purpose of adopting this scheme is to ensure that the preheating bin body works efficiently and reliably.

[0011] Preferably, the preheating bin body is cylindrical as a whole, and a cyclone interlayer is arranged on the preheating bin body; the cyclone interlayer includes an inner wall, an outer wall and spiral ventilation blades arranged between the inner wall and the outer wall, and the spiral ventilation blades are spirally distributed between the inner wall and the outer wall from top to bottom to form a cyclone flow channel; the outer wall is the outer wall of the preheating bin body, and the inner side is made of stainless steel mesh; the air inlet on the bin body is arranged at a position on the preheating bin body close to the upper cone barrel, and the outer wall is also cooperated with a thermal insulation material; the purpose of adopting this scheme is to ensure that the alloy to be baked entering from the top can be heated instantly, thereby improving thermal efficiency, while ensuring that the bottom will not be damaged, thereby improving the availability of the equipment.

[0012] Preferably, the air inlet on the bin body is tangentially connected to the outer wall, and the spiral ventilation blades of the cyclone flow channel are arranged along the flow direction of the air inlet on the bin body and gradually rotate and extend downward; the spiral ventilation blades are arranged in two layers side by side; the purpose of adopting this scheme is to ensure that hot air can form a cyclone through the spiral ventilation blades and enter the interior of the preheating bin body to quickly heat and bake the alloy.

[0013] Preferably, the heat exchanger is a heat storage heat exchanger, and the heat storage heat exchanger has one group of heat exchanger inlets and two groups of heat exchanger outlets; the air supply ports are also provided with two groups corresponding to the two groups of heat exchanger outlets; the air supply ports are respectively provided with air volume pneumatic regulating valves and air volume manual regulating valves, and the two groups of heat exchanger outlets are also provided with outlet pressure monitoring devices and outlet temperature monitoring devices; the purpose of adopting this scheme is to ensure the high heat exchange efficiency of the heat storage heat exchanger, and to facilitate the adjustment of the air volume to ensure internal safety, while preventing heat from being concentrated on the positive pressure fan, reducing the service life of the positive pressure fan, and can preheat the combustion-supporting air and improve the combustion efficiency of the burner.

[0014] Preferably, a tangential connection is provided between the pipeline connected to the outlet of the positive pressure blower and the pipeline connected to the outlet of the furnace body, the pipeline connected to the outlet of the furnace body is a hot air main pipeline, a hot air lower pipeline is tangentially provided at the rear section of the hot air main pipeline at the tangential connection and is connected to the lower air inlet of the bin body, the hot air main pipeline finally enters the hot air upper pipeline through a reducer and is connected to the upper air inlet of the bin body; the diameter of the hot air main pipeline is larger than the diameter of the hot air upper pipeline, and the ratio of the diameter of the hot air upper pipeline to the diameter of the hot air lower pipeline is 1.8-3:1; the purpose of adopting this scheme is to introduce the generated hot air into the preheating bin body in an induced manner, and bake the upper and lower parts of the preheating bin body respectively, and ensure that the baking temperature of the upper part of the preheating bin body is higher than the baking temperature of the lower part.

[0015] Preferably, corrugated compensation pipes are respectively provided at the inlet and outlet of the positive pressure fan and the inlet and outlet of the combustion-supporting fan; the purpose of adopting this solution is to facilitate the absorption of dimensional changes of pipelines, ducts, containers, etc. caused by thermal expansion and contraction.

[0016] When the present invention is working, it includes a fuel gas system, a positive pressure system, a circulation system and a hot blast furnace combustion-supporting air system;

[0017] The coal gas enters the gas main line through the gas main stop valve and enters the corresponding gas pipelines from multiple groups of gas branch pipelines respectively. The combustion-supporting gas enters the multiple groups of combustion-supporting branch pipelines from the combustion-supporting main line and enters the corresponding gas casings respectively.

[0018] The combustion-supporting gas is pushed by the combustion-supporting fan and passes through the guide vanes to form a cyclone and enter the furnace body, where it is fully mixed with the coal gas coming from the gas pipeline and sprayed into the furnace body;

[0019] After the ignition device and the constant flame device are ignited, they will maintain a constant flame state and keep the angle with the burner between 30° and 45° to ensure that the mixed gas is continuously ignited and fully burned;

[0020] Positive pressure system:

[0021] The hot air generated after the combustion of the furnace body is pressurized to 8-15Kpa by the positive pressure fan, and then enters the hot air main line from the furnace body outlet. One path of hot air enters the preheating bin through the upper air inlet of the bin body, and the other path of hot air enters the lower cone barrel through the lower air inlet of the bin body.

[0022] At this time, the feeding port set at the upper cone barrel of the preheating bin can be used for feeding, and the raw materials fed and baked are ferrosilicon and ferromanganese alloys; the alloy preheating temperature is controlled in the range of 600℃, each bin has no less than 4t, and the baking time is 30~45min;

[0023] The preheating bin body is in the form of an upper cone barrel, a preheating bin body and a lower cone barrel, so that the air volume and air pressure at the preheating bin body and the lower cone barrel can be controlled separately during control; ensure that the pipe air pressure at the air inlet on the bin body is 6~12Kpa, and the air inlet temperature is about 7~9℃;

[0024] When the hot air enters the cylindrical preheating bin through the air inlet on the bin, it will pass through the cyclone interlayer. The hot air entering the cyclone interlayer accounts for 45%-55% of the total hot air. When entering the cyclone flow channel, it enters the preheating bin through the inner wall, so that the material entering the feeding port is quickly heated up. The remaining hot air flows along the spiral ventilation blades and gradually enters the preheating bin to bake the descending material.

[0025] The alloy to be baked finally falls into the lower cone barrel, and another hot air enters the lower cone barrel through the lower air inlet of the bin body to bake the alloys with irregular shapes. The hot air can flow in the gaps between adjacent alloys to prevent the alloys from sticking together during baking. The ratio of hot air passing through the upper air inlet of the bin body and the upper air inlet of the bin body is 1.8-3:1.

[0026] The baked alloy is then discharged from the discharge valve through the discharge port in turn. While discharging, the positive pressure fan uses the -8~-12Kpa pressure at its inlet to extract the preheated hot air from the bypass outlet. The temperature of the extracted hot air is between 4℃ and 5℃.

[0027] At the same time, the exhaust gas outlet can be connected to the secondary dust removal main pipe to prevent hot air from overflowing and polluting the working environment;

[0028] Circulatory system:

[0029] The positive pressure fan uses the -8~-12Kpa pressure at its inlet to extract the preheated hot air from the bypass outlet, and enters the heat storage heat exchanger for sufficient heat exchange, and comes out from the two heat exchanger outlets respectively;

[0030] The positive pressure fan uses the air from one of the outlets of the heat storage heat exchanger as circulating air to mix with the hot air from the furnace outlet and participate in the alloy baking process again. At the same time, it can also provide air supply through the corresponding air supply port at its outlet.

[0031] Hot blast stove combustion air system;

[0032] The combustion-supporting fan draws the air from the other outlet of the heat storage heat exchanger into the combustion-supporting main line and into the furnace body for combustion support, and uses it as the combustion-supporting air required for preheating the hot blast furnace for combustion. At the same time, it can provide air supply through the air supply port corresponding to its outlet. The use of narrowed reducers at the combustion-supporting main line and the combustion-supporting pipeline can increase the pressure of the combustion-supporting air and ensure that it is sprayed farther into the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings:

[0034] Figure 1 It is a three-dimensional stereogram of the present invention viewed from the front and obliquely above.

[0035] Figure 2 It is a three-dimensional stereogram of the present invention viewed from the rear and obliquely above.

[0036] Figure 3 This is a partial three-dimensional image of the preheating chamber body without the outer wall.

[0037] Figure 4 It is a three-dimensional picture of the furnace body as a whole and its interior.

[0038] Figure 5 It is a side three-dimensional stereogram of the present invention.

[0039] Figure 6 for Figure 5 Enlarged view of the area marked A.

[0040] Figure 7 It is the work flow chart of the present invention.

[0041] Among them, 1 hot blast furnace, 2 heat exchanger, 3 preheating bin, 4 furnace inlet, 5 furnace outlet, 6 exhaust gas outlet, 7 bypass outlet, 8 manual feeding port, 9 automatic unloading port of raw material bin, 10 discharge port, 11 discharge valve, 12 combustion-supporting fan, 13 upper air inlet of bin, 14 lower air inlet of bin, 15 regenerative heat exchanger, 16 heat exchanger outlet, 17 air supply port, 18 corrugated compensation pipe, 19 explosion-proof valve, 20 positive pressure fan, 21 furnace body, 22 support frame, 23 manhole, 24 combustion-supporting main pipeline, 25 auxiliary fuel branch pipeline, 26 heat exchanger inlet, 27 gas main pipeline, 28 gas branch pipeline, 29 reinforcement ribs, 30 refractory material, 31 lower cone barrel, 32 preheating bin body, 33 upper cone barrel, 34 inner wall, 35 spiral ventilation blades, 36 ignition device, 37 outer wall, 38 gas pipeline, 39 guide blades, 40 gas shell, 41 furnace shell, 42 cyclone interlayer, 43 constant open flame device, 44 cyclone flow channel, 45 tangential connection, 46 hot air main pipeline, 47 hot air upper pipeline, 48 hot air lower pipeline. DETAILED DESCRIPTION

[0042] like Figure 1-7 As shown, in order to achieve the above-mentioned purpose, the present invention includes a hot blast furnace 1, a preheating bin 3 and a heat exchanger 2 arranged in cooperation with the hot blast furnace 1; the hot blast furnace 1 includes a furnace body 21, a furnace body inlet 4, and a furnace body outlet 5; the preheating bin 3 includes a preheating bin body 32, an exhaust gas outlet 6, a bypass outlet 7, a feeding port, a bin body air inlet and a discharge port 10 respectively arranged in cooperation with the preheating bin body 32; the heat exchanger 2 includes a heat exchanger body, a heat exchanger inlet 26 and a heat exchanger outlet 16; the heat exchanger outlet 16 is provided with a plurality of groups, wherein One group of heat exchanger outlets 16 are connected to the inlet of the positive pressure fan 20 through a pipeline, and the outlet of the positive pressure fan 20 is connected to the furnace body outlet 5 through a pipeline and leads to the air inlet of the bin body; the bypass outlet 7 of the preheating bin body 32 is connected to the heat exchanger inlet 26 through a pipeline; another group of heat exchanger outlets are connected to the inlet of the combustion-supporting fan 12 through a pipeline, and the outlet of the combustion-supporting fan 12 is connected to the furnace body inlet 4 through a combustion-supporting pipeline, and the furnace body inlet 4 is also connected to the gas pipeline 38; the positions of the heat exchanger outlets 16 are also provided with air supply ports 17.

[0043] 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, and the furnace body outlet 5 is arranged on the other side of the furnace body 21. The furnace body 21 includes a furnace shell 41, a furnace body refractory material 30 arranged in the furnace shell 41, and a furnace body reinforcement rib 29 evenly welded on the inner side of the furnace shell 41; an explosion-proof valve 19 and a furnace temperature detection device are arranged on the furnace shell 41, a manhole 23 is arranged on the side of the furnace shell 41, and a supporting frame 22 is arranged at the bottom of the furnace shell 41; side reinforcement ribs are also arranged on both sides of the furnace shell 41.

[0044] The furnace inlet 4 is provided with several groups, each group of furnace inlet 4 is provided with a corresponding burner, the burner is provided with a flame detection device, each group of burners is provided with an ignition device 36 and a constant flame device 43, and the angle between the ignition device 36 and the constant flame device 43 and the burner is between 30° and 45°; the gas pipeline 38 is connected to the gas system, the gas pipeline 38 includes a gas main pipeline 27 and multiple groups of gas branch pipelines 28, and the gas main pipeline 27 includes a gas main shut-off valve in turn. , gas main drain valve, gas main nitrogen purge interface, gas main pressure transmitter, gas main manual regulating valve and gas main pneumatic regulating valve; the gas branch pipe check valve and gas branch regulating valve are installed on the gas branch pipe 28; the combustion-supporting pipeline includes a combustion-supporting main pipe 24 and several groups of combustion-supporting branch pipes 25, and the several groups of combustion-supporting branch pipes 25 are respectively provided with combustion-supporting branch regulating valves; the combustion-supporting branch pipes 25 and the gas branch pipes 28 correspond to each other one by one and are introduced into the furnace body inlet 4 through the burner;

[0045] The burner includes a gas shell 40 and a gas pipeline 38. The combustion shell is cylindrical. A furnace inlet flange is provided at the furnace inlet 4. The gas shell 40 and the furnace inlet flange are connected together. The gas pipeline 38 is introduced into the furnace body 21 through the furnace inlet flange. A guide vane 39 is provided between the outer wall of the gas pipeline 38 and the inner wall of the furnace inlet flange. The guide vanes 39 are evenly distributed in a spiral shape. The combustion-supporting branch pipeline 25 is tangentially connected to the gas pipeline 38, and the gas branch pipeline 28 is tangentially connected to the gas shell 40.

[0046] The preheating bin body 32 includes a preheating bin body, an upper cone barrel 33 arranged on the preheating bin body, and a lower cone barrel 31 arranged below the preheating bin body. The lower cone barrel 31 is provided with a double layer, and the inner layer of the lower cone barrel 31 is made of thick stainless steel plate; the bin body air inlet includes an upper bin body air inlet 13 and a lower bin body air inlet 14, the upper bin body air inlet 13 leads to the interior of the preheating bin body, and the lower bin body air inlet 14 leads to the lower cone barrel 31, and the upper bin body air inlet 13 and the lower bin body 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 includes a plurality of air inlets respectively provided at the top of the upper cone barrel 33 and the lower cone barrel 33. The manual feeding port 8 of the upper part and the automatic unloading port 9 of the raw material bin are provided, and the automatic unloading port 9 of the raw material bin is provided with a pneumatic swing valve; the discharge port 10 is provided at the bottom of the lower cone barrel 31 and is provided with a discharge valve 11; the preheating bin body 32 is supported by a bin body bracket; the exhaust gas outlet 6 is connected to the exhaust gas pipeline through a corrugated compensation pipe 18, and the exhaust gas pipeline is provided with an exhaust gas knife rod gate valve, an exhaust gas pneumatic regulating valve and an exhaust gas temperature monitoring device in sequence; the bypass outlet 7 is connected to the exhaust gas pipeline through a three-way pipeline, and the bypass outlet 7 is also provided with a bypass knife rod gate valve, a bypass pneumatic regulating valve and a bypass circulating air pressure monitoring device;

[0047] The preheating bin body is cylindrical in shape as a whole, and a cyclone interlayer 42 is arranged on the preheating bin body; the cyclone interlayer 42 includes an inner wall 34, an outer wall 37 and spiral ventilation blades 35 arranged between the inner wall 34 and the outer wall, and the spiral ventilation blades 35 are spirally distributed between the inner wall 34 and the outer wall 37 from top to bottom and form a cyclone flow channel 44; the outer wall 37 is the outer wall of the preheating bin body, and the inner side is made of stainless steel mesh; the upper air inlet 13 of the bin body is arranged on the preheating bin body near the upper cone barrel 33, and the outer wall 37 is also provided with a heat preservation material;

[0048] The air inlet 13 on the silo body is tangentially connected to the outer wall 37, and the spiral ventilation blades 35 of the cyclone flow channel 44 are arranged along the flow direction of the air inlet 13 on the silo body and gradually extend downward in a rotating manner; the spiral ventilation blades 35 are arranged side by side in two layers;

[0049] The heat exchanger 2 is a heat storage heat exchanger 15, and the heat exchanger inlet 26 on the heat storage heat exchanger 15 is provided with one group, and the heat exchanger outlet 16 is provided with two groups; the air supply port 17 is also provided with two groups corresponding to the two groups of heat exchanger outlets 16; the air supply port 17 is respectively provided with an air volume pneumatic regulating valve and an air volume manual regulating valve, and the two groups of heat exchanger outlets 16 are also provided with an outlet pressure monitoring device and an outlet temperature monitoring device;

[0050] The pipeline connected to the outlet of the positive pressure fan 20 and the pipeline connected to the furnace body outlet 5 are provided with a tangential connection 45, and the pipeline connected to the furnace body outlet 5 is a hot air main pipeline 46, and the hot air main pipeline 46 is tangentially provided with a hot air lower pipeline 48 at the rear section of the tangential connection 45 and connected to the lower air inlet 14 of the warehouse body, and the hot air main pipeline 46 finally enters the hot air upper pipeline 47 through a reducer and is connected to the upper air inlet 13 of the warehouse body; the diameter of the hot air main pipeline 46 is larger than the diameter of the hot air upper pipeline 47, and the ratio of the diameter of the hot air upper pipeline 47 to the diameter of the hot air lower pipeline 48 is 1.8-3:1;

[0051] The inlet and outlet of the positive pressure fan 20 and the inlet and outlet of the combustion-supporting fan 12 are respectively provided with a corrugated compensation pipe 18;

[0052] When the present invention is working, it includes a fuel gas system, a positive pressure system, a circulation system and a combustion-supporting air system of a hot blast furnace 1;

[0053] The coal gas enters the gas main line 27 through the gas main stop valve and enters the corresponding gas pipelines 38 from the multiple gas branch pipelines 28. The combustion-supporting gas enters the multiple combustion-supporting branch pipelines 25 from the combustion-supporting main line 24 and enters the corresponding gas housings 40.

[0054] The combustion-supporting gas is pushed by the combustion-supporting fan 12 and passes through the guide vanes 39 to form a cyclone and enter the furnace body 21. The gas is fully mixed with the coal gas from the gas pipeline 38 and sprayed into the furnace body 21.

[0055] After the ignition device 36 and the constant flame device 43 are ignited, they maintain a constant flame state and maintain an angle of 30°-45° with the burner to ensure that the mixed gas is continuously ignited and fully burned;

[0056] Positive pressure system:

[0057] The hot air generated by the combustion of the furnace body 21 is pressurized to 8-15Kpa by the positive pressure fan 20, and then enters the hot air main line 46 from the furnace body outlet 5. One path of hot air enters the preheating bin through the upper air inlet 13 of the bin body, and the other path of hot air enters the lower cone barrel 31 through the lower air inlet 14 of the bin body.

[0058] At this time, the feeding port set at the upper cone barrel 33 of the preheating bin can be used for feeding, and the raw materials fed and baked are ferrosilicon and ferromanganese alloys; the alloy preheating temperature is controlled in the range of 600°C, each bin material is not less than 4t, and the baking time is 30~45min;

[0059] The preheating bin body 32 is in the form of an upper cone barrel 33, a preheating bin body and a lower cone barrel 31, so that the air volume and air pressure at the preheating bin body and the lower cone barrel 31 can be controlled separately during control; ensuring that the pipeline air pressure at the air inlet 13 on the bin body is 6~12Kpa, and the air inlet temperature is about 7~9℃;

[0060] When the hot air enters the cylindrical preheating bin through the air inlet 13 on the bin, it passes through the cyclone interlayer 42. The hot air entering the cyclone interlayer 42 accounts for 45%-55% of the total hot air. When entering the cyclone flow channel 44, it enters the preheating bin through the inner wall 34, so that the material entering the feeding port is quickly heated. In addition, the remaining hot air flows along the spiral ventilation blades 35 and gradually enters the preheating bin to bake the descending material.

[0061] The alloy to be baked finally falls into the lower cone barrel 31, and another hot air enters the lower cone barrel 31 through the lower air inlet 14 of the bin body to bake the alloys with irregular shapes. The hot air can flow in the gaps between adjacent alloys to prevent the alloys from sticking together during baking. The ratio of hot air through the upper air inlet 13 of the bin body to the upper air inlet 13 of the bin body is 1.8-3:1.

[0062] The alloy after baking is then discharged from the discharge valve 11 through the discharge port 10. During the discharge, the positive pressure blower 20 uses the pressure of -8~-12Kpa at its inlet to extract the preheated hot air from the bypass outlet 7. The temperature of the extracted hot air is between 4℃ and 5℃.

[0063] At the same time, the exhaust gas outlet 6 can be connected to the secondary dust removal main pipe to prevent hot air from overflowing and polluting the working environment;

[0064] Circulatory system:

[0065] The positive pressure fan 20 uses the pressure of -8~-12Kpa at its inlet to extract the preheated hot air from the bypass outlet 7, and enters the heat storage heat exchanger 15 for sufficient heat exchange, and comes out from the two heat exchanger outlets 16 respectively;

[0066] The positive pressure fan 20 mixes the air from one of the outlets of the heat storage heat exchanger 15 as circulating air with the hot air from the furnace outlet 5 and participates in the alloy baking process again. At the same time, it can also provide air supply through the corresponding air supply port 17 at its outlet.

[0067] Hot blast furnace 1 combustion air system;

[0068] The combustion-supporting fan 12 draws the air from the other outlet of the heat storage heat exchanger 15 into the combustion-supporting main line 24 and enters into the furnace body 21 for combustion, and uses it as the combustion-supporting air required for preheating the hot blast furnace 1 for combustion. At the same time, it can be replenished with air through the air replenishment port 17 corresponding to its outlet. The use of narrowed reducers at the combustion-supporting main line 24 and the combustion-supporting pipeline can increase the pressure of the combustion-supporting air and ensure that it is sprayed farther into the furnace body 21.

[0069] After completion, nitrogen is connected to the nitrogen purge interface of the gas main pipe for nitrogen purge, and the residual gas inside the furnace body 21 is blown out and enters the hot air main pipe 46 from the furnace body outlet 5, and enters the hot air lower pipe 48 and the hot air upper pipe 47 through the hot air main pipe 46 respectively, and is finally discharged from the exhaust gas outlet 6 to complete the entire purge process, thereby avoiding poisoning of the cleaning personnel.

[0070] During the above working process, because the hot air generated in the furnace body 21 has participated in the combustion once, it is not suitable to participate in the combustion process as combustion-supporting air again; the present system directly uses it as positive-pressure circulating air to participate in the baking process, but does not participate in the combustion process, so it will not reduce the overall combustion efficiency of the hot blast furnace 1, while efficiently utilizing its residual heat and avoiding the reduction of combustion efficiency; and the temperature drop of the circulating air in the pipeline can preheat the combustion-supporting air through the heat storage heat exchanger 15, preventing heat from being concentrated in the positive-pressure fan 20 and reducing the service life of the positive-pressure fan 20, while preheating the combustion-supporting air, the combustion efficiency of the burner of the hot blast furnace 1 can be improved.

[0071] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A positive pressure hot air heat storage alloy baking device, characterized in that: It comprises a hot blast furnace, a preheating bin and a heat exchanger arranged in cooperation with the hot blast furnace; the hot blast furnace comprises a furnace body, a furnace body inlet and a furnace body outlet, the preheating bin comprises a preheating bin body, an exhaust gas outlet, a bypass outlet, a feeding port, a bin body air inlet and a discharge port respectively arranged in cooperation with the preheating bin body; the heat exchanger comprises a heat exchanger body, a heat exchanger inlet and a heat exchanger outlet; the heat exchanger outlet is provided with several groups, one group of heat exchanger outlets is connected with the inlet of a positive pressure fan through a pipeline, the outlet of the positive pressure fan is connected with the furnace body outlet through a pipeline and leads to the bin body air inlet; the bypass outlet of the preheating bin body is connected with the heat exchanger inlet through a pipeline; another group of heat exchanger outlets is connected with the inlet of a combustion-supporting fan through a pipeline, the outlet of the combustion-supporting fan is connected with the furnace body inlet through a combustion-supporting pipeline, and the furnace body inlet is also connected with a gas pipeline; air supply ports are also respectively arranged at the positions of the heat exchanger outlets; The furnace body inlet is provided with several 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 flame device, and the angle between the ignition device and the normally open flame device and the burner is between 30°-45°; the gas pipeline is connected to the gas system, the gas pipeline includes a gas main pipeline and multiple groups of gas branch pipelines, the gas main pipeline includes a gas main stop valve, a gas main drain valve, a gas main nitrogen purge interface, a gas main pressure transmitter, a gas main manual regulating valve and a gas main pneumatic regulating valve in sequence; a gas branch check valve and a gas branch regulating valve are installed on the gas branch pipeline; the combustion-supporting pipeline includes a combustion-supporting main pipeline and several groups of combustion-supporting branch pipelines, and combustion-supporting branch regulating valves are respectively provided on several groups of combustion-supporting branch pipelines; the combustion-supporting branch pipelines correspond to the gas branch pipelines one by one and are passed into the furnace body inlet through the burner; The burner comprises a gas shell and a gas pipeline. The combustion shell is cylindrical. A furnace inlet flange is provided at the furnace inlet. The gas shell and the furnace inlet flange are connected together. The gas pipeline is introduced into the furnace body through the furnace inlet flange. A guide vane is provided between the outer wall of the gas pipeline and the inner wall of the furnace inlet flange. The guide vanes are evenly distributed in a spiral shape. The combustion-supporting branch pipeline is tangentially connected to the gas pipeline, and the gas branch pipeline is tangentially connected to the gas shell. The preheating bin body comprises a preheating bin body, an upper cone barrel arranged on the preheating bin body, and a lower cone barrel arranged below the preheating bin body, wherein the lower cone barrel is provided with a double layer, and the inner layer of the lower cone barrel is made of a thick stainless steel plate; the bin body air inlet comprises an upper bin body air inlet and a lower bin body air inlet, wherein the upper bin body air inlet leads to the interior of the preheating bin body, and the lower bin body air inlet leads to the lower cone barrel, wherein the upper bin body air inlet and the lower bin body air inlet 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 a manual feeding port respectively provided at the top of the upper cone barrel and a feeding port respectively provided at the top of the upper cone barrel. The material port and the automatic material discharge port of the raw material bin are provided with a pneumatic swing valve; the material discharge port is provided at the bottom of the lower cone barrel and is provided with a discharge valve; the preheating bin body is supported by a bin body bracket; the exhaust gas outlet is connected to the exhaust gas pipeline through a corrugated compensation pipe, and the exhaust gas pipeline is provided with an exhaust gas knife rod gate valve, an exhaust gas pneumatic regulating valve and an exhaust gas temperature monitoring device in sequence; the bypass outlet is connected to the exhaust gas pipeline through a three-way pipe, and the bypass outlet is also provided with a bypass knife rod gate valve, a bypass pneumatic regulating valve and a bypass circulating air pressure monitoring device; The preheating bin body is generally cylindrical, and a cyclone interlayer is arranged on the preheating bin body; the cyclone interlayer comprises an inner wall, an outer wall and spiral ventilation blades arranged between the inner wall and the outer wall, and the spiral ventilation blades are spirally distributed between the inner wall and the outer wall from top to bottom and form a cyclone flow channel; the outer wall is the outer wall of the preheating bin body, and the inner side is made of stainless steel mesh; the air inlet on the bin body is arranged on the preheating bin body near the upper cone barrel, and the outer wall is also provided with thermal insulation material.

2. A positive pressure hot air heat storage alloy baking device according to claim 1, characterized in that: 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 includes a furnace shell, a furnace body refractory material arranged in the furnace shell, and furnace body reinforcement ribs on the inner side of the furnace shell are evenly welded; an explosion-proof valve and a furnace temperature detection device are arranged on the furnace shell, a manhole is arranged on the side of the furnace shell, and a supporting frame is arranged at the bottom of the furnace shell; side reinforcement ribs are also arranged on both sides of the furnace shell.

3. The positive pressure hot air heat storage alloy baking device according to claim 1, characterized in that: The air inlet on the bin body is tangentially connected to the outer side wall, and the spiral ventilation blades of the cyclone flow channel are arranged along the flow direction of the air inlet on the bin body and gradually rotate and extend downward; the spiral ventilation blades are arranged in two layers side by side.

4. The positive pressure hot air heat storage alloy baking device according to claim 1, characterized in that: The heat exchanger is a heat storage type heat exchanger, and one group of heat exchanger inlets and two groups of heat exchanger outlets are arranged on the heat storage type heat exchanger; two groups of air supply ports are also arranged corresponding to the two groups of heat exchanger outlets; the air supply ports are respectively provided with air volume pneumatic regulating valves and air volume manual regulating valves, and the two groups of heat exchanger outlets are also provided with outlet pressure monitoring devices and outlet temperature monitoring devices.

5. The positive pressure hot air heat storage alloy baking device according to claim 1, characterized in that: A tangential connection is provided between the pipeline connected to the outlet of the positive pressure blower and the pipeline connected to the outlet of the furnace body; the pipeline connected to the outlet of the furnace body is a hot air main pipeline; a hot air lower pipeline is tangentially provided on the rear section of the hot air main pipeline at the tangential connection and is connected to the lower air inlet of the bin body; the hot air main pipeline finally enters the hot air upper pipeline through a reducer and is connected to the upper air inlet of the bin body; the diameter of the hot air main pipeline is larger than the diameter of the hot air upper pipeline, and the ratio of the diameter of the hot air upper pipeline to the diameter of the hot air lower pipeline is 1.8-3:

1.

6. The positive pressure hot air heat storage alloy baking device according to claim 1, characterized in that: The inlet and outlet of the positive pressure fan and the inlet and outlet of the combustion-supporting fan are respectively provided with corrugated compensation pipes.

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