Soaking pit equipment with multiple burners, branch furnace chambers, mutual heating and smoke return circulation

Abstract

The utility model relates to soaking pit equipment with multiple burners, branch furnace chambers, mutual heating and smoke return circulation. The soaking pit equipment comprises a furnace body unit, a combustion unit, a sealing unit, a smoke exhaust unit and a control unit, the furnace body unit comprises a furnace cover and a furnace pit, and a common wall is arranged in the furnace pit and divides the furnace pit into a plurality of branch furnace chambers; the combustion unit comprises a burner, and the burner is arranged at the upper part of the end wall of each branch furnace chamber; the sealing unit comprises a soft seal and a hard seal; the device has the advantages that high-temperature flue gas is injected under pressure to be returned to a furnace for circulation, the high-temperature flue gas is burnt out for the second time, and therefore the back faces of steel ingots leaning against a wall are heated, the steel ingots in a furnace pit are evenly heated, the heat efficiency is improved, and the energy consumption is reduced. The steel ingot is heated on both sides of the female and male surfaces, the heating speed is high, the heat energy utilization rate is high, the heat efficiency is high, the labor intensity of workers is reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel rolling soaking equipment, in particular to a soaking furnace equipment with multiple burners, separate furnace chambers, mutual heating and attached smoke return circulation. Background Art

[0002] The soaking furnace is an important equipment used by steel mills to heat or soak steel ingots. It is mainly used for heating and soaking steel ingots before blanking or rolling. In today's new context of strategic development such as aerospace, marine development, national defense equipment, and energy security, the processing of some special steels, military steels and other products especially requires soaking furnaces. The existing soaking furnaces have highlighted their old technology and huge gaps in product quality, unit area output, operation automation, energy saving, environmental protection and many other aspects, and it is difficult to adapt to the digital layout of the modern steel rolling process industry.

[0003] The main shortcomings of the existing soaking furnace are as follows:

[0004] 1. High energy consumption: Due to the unreasonable furnace structure and combustion organization, the flue gas emission takes away a lot of heat energy, the low level of automation, the lack of precise air-fuel ratio control, the furnace cover is not tightly sealed, the furnace pressure is uncontrollable and other defects, the energy consumption is high. The several operations of flipping the positive and negative sides during the production process will lead to a large waste of heat energy.

[0005] 2. Low production capacity: When loading the furnace, the steel ingots can only stand and tilt against the furnace wall, and can only be placed along the side furnace wall. They cannot stand in the middle and are easy to stick to the steel when stacked, so the output per unit area is limited;

[0006] 3. Poor temperature uniformity: Single-sided heating, no heat supply to the back of the ingot, so to improve the temperature uniformity of the ingot, we can only rely on manual flipping of the positive and negative sides. The manual labor intensity is high, the risk is high, the thermal energy utilization rate is low, and the temperature uniformity of the ingot is particularly poor.

[0007] 4. Large oxidation burnout: The local high temperature of the burner flame causes large oxidation burnout, and the air-fuel ratio is out of control or uncontrollable, causing large oxidation burnout. The heating process of turning the positive and negative sides of the steel ingot during the high temperature process not only causes a huge heat loss during the uncovering process, but also greatly increases the oxidation burnout rate;

[0008] 5. High scrap rate of special steel products: Special steels such as high carbon steel, alloy steel, and military steel have low thermal conductivity. Under non-hot charging furnace conditions, thermal stress will be generated in the initial stage of steel ingot heating due to excessive temperature difference, which will eventually lead to rolling into scrap. The existing furnace type can never achieve hot charging production without sacrificing fuel.

[0009] 6. Environmental protection does not meet standards: The soaking furnace is a typical intermittent high-temperature furnace, with a furnace gas temperature of more than 1400°C and harmful gases seriously exceeding the standard;

[0010] 7. The level of automation is far behind. Summary of the invention

[0011] The utility model discloses a kind of hot-dip sintering furnace equipment, and the hot-dip sintering furnace equipment of the present invention is provided. The hot-dip sintering furnace equipment of the present invention has the advantages of high temperature, low calorific value, and good heat preservation, and has the advantages of low cost, low energy consumption, and good heat preservation, and has the advantages of low energy consumption, low calorific value, and good heat preservation, and has the advantages of low cost, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, low energy consumption, and good heat preservation, and has the advantages of low cost, low energy consumption, low energy consumption, high calorific value, and good heat preservation, and has the advantages of low cost, low energy consumption, high calorific value, high energy preservation, and good heat preservation, and has the advantages of low cost, low energy consumption, high calorific value, high

[0012] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0013] A soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke recirculation, including a furnace body unit, a combustion unit, a sealing unit, a smoke exhaust unit and a control unit; the furnace body unit includes a furnace cover and a furnace pit, the furnace pit is a box-type structure, a furnace cover is provided on the upper part of the furnace pit, and a common wall is provided in the furnace pit to divide the furnace pit into a number of separate furnace chambers; the combustion unit includes a burner and a medium pipeline and a valve, the burner is arranged on the upper part of the end wall of each separate furnace chamber, the burners are arranged in an interlaced manner facing each other, and the outside of the burner is connected to the medium pipeline and the valve; the sealing unit includes a furnace cover The fiber ropes arranged around are in contact with the fiber ropes arranged on the upper part of the furnace walls around to form a soft seal, and the sealing knives arranged around the furnace cover cooperate with the sand sealing grooves around the furnace walls to form a hard seal; the smoke exhaust unit includes a smoke exhaust port, a smoke channel, a smoke collecting chamber, an underground flue, a smoke exhaust fan, and a chimney. The smoke exhaust port is arranged at the lower part of the furnace wall of the separate furnace chamber and the lower part of both sides of the common wall. The smoke exhaust port is connected to the smoke channel. The smoke channel exits the furnace and is collected into the smoke collecting chamber. A compressed air nozzle is arranged on the top of the smoke collecting chamber to draw the high-temperature smoke back to the furnace for circulation, stirring the furnace gas and secondary combustion.

[0014] Furthermore, the smoke exhaust port is a variable cross-section smoke exhaust port with a larger smoke exhaust port on the side away from the smoke collecting chamber and a smaller smoke exhaust port on the side close to the smoke collecting chamber.

[0015] Furthermore, smoke passages are built into the lower parts of both sides of the common wall, and the smoke exhaust ports on both sides are respectively connected to the smoke passages on the same side.

[0016] Furthermore, the common wall is provided with through holes on both sides which are isolated from the smoke passage.

[0017] Furthermore, the common wall adopts special-shaped mother-and-child locking structure prefabricated blocks combined with locking bricks and high-strength round steel for locking and positioning. The special-shaped mother-and-child locking structure prefabricated blocks are welded and fixed with the reserved ends of the anchor hooks in the prefabricated blocks using high-strength round steel and anchors.

[0018] Furthermore, the high-strength round steel is embedded in the refractory wall in the form of a tie rod and is connected to the exterior wall steel structure column by fastening with nuts.

[0019] Furthermore, the high-strength round steel needs to be wrapped with a zirconium-containing fiber needle-punched blanket, sealed with tape, inserted into a PVC pipe and fixed before pouring construction.

[0020] Furthermore, the joint between the common wall and the end wall adopts an inlaid furnace structure.

[0021] Furthermore, the control unit is an automated control system for optimizing the heating process equipped in the entire soaking furnace equipment.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. Compared with traditional soaking furnaces, the same furnace area has increased production capacity:

[0024] When the furnace pit is divided into separate furnace chambers by a common wall for heating, the steel ingots can be placed back to back on both sides of the common wall, and the steel ingots can be placed around each separate furnace chamber. Then the whole furnace pit forms a double "O"-shaped or multiple "O"-shaped billet layout, thereby increasing the production capacity per unit area and taking advantage of the maximum furnace loading capacity.

[0025] 2. Compared with the traditional soaking furnace wall heat carrier, it becomes a heat exchanger and heat storage body, with dual efficiency of heat transfer and waste heat utilization

[0026] The lower parts of all the furnace walls in the furnace pit are orderly built with smoke exhaust ports of different areas facing the furnace chamber, which are connected in series with the built-in flue in the furnace wall to form a high-temperature flue gas channel inside the furnace wall; similarly, the lower part of the common wall has smoke exhaust ports built in the furnace chamber on both sides, which are connected in series to form a double row of high-temperature flue gas channels in the wall, so that all the walls in the furnace body become "fire walls" for heat exchange. The "fire wall" exchanges heat with the steel ingots leaning against it, reduces the temperature difference between the positive and negative surfaces during the heating process of the steel ingots, shortens the heating time, and improves the heating efficiency. After steel is discharged, the residual temperature of the fire channel in the furnace wall remains, and the furnace wall becomes a heat storage body for maintaining the furnace temperature; therefore, the utility model invents a heat-carrying furnace wall, which is particularly helpful for smoothing the temperature change and balancing the temperature difference during the heating load adjustment process, and at the same time breaks through the traditional cold furnace charging conditions to form a hot charging condition with an initial temperature.

[0027] 3. Compared with traditional soaking furnaces, dual furnace chambers can be heated in the same furnace pit, and steel can be burned in reverse direction at low load.

[0028] The same furnace pit is divided into several sub-furnace chambers for heating by a common wall. The common wall is partially scientifically provided with through holes. The sub-furnace chambers can burn steel synchronously, or they can produce alternately and heat cyclically. When the load is low, the sub-furnace chambers can achieve reversal burning, which saves energy and reduces emissions.

[0029] 4. Compared with traditional soaking furnaces, the furnace temperature uniformity is greatly improved

[0030] Each sub-furnace chamber of the same furnace pit is heated by multiple burners. The burners are arranged at opposite end walls of each furnace chamber at opposite angles and tangentially to each other, and the burning is staggered along the length of the furnace chamber. Because variable-section flue openings are evenly distributed around the bottom of the furnace wall, the exhaust of the heat-matching furnace is balanced and not biased. The negative pressure exhaust guides the high-temperature exhaust gas fluid to swirl downward for heating. During the heating process, the tangential circular swirling flame swirl formed on the upper layer forms a stable and uniform temperature field downward. The heat-carrying furnace wall maintains the heat balance along the length of the furnace chamber while the swirl from top to bottom forms an isothermal section. The reasonable distance between the flame and the steel ingot is guaranteed in the furnace width direction, thereby effectively improving the uniformity of the furnace temperature, reducing the temperature difference of the steel ingot body, and ensuring that the heating uniformity value meets the standard.

[0031] 5. Compared with the traditional soaking furnace, the secondary sealing performance of the soft and hard seal is better

[0032] The soft seal formed between the fiber rope on the inner ring of the furnace cover and the fiber rope around the furnace mouth, and the hard seal between the sealing knife arranged on the outside of the furnace cover and the sand sealing groove on the outside of the furnace mouth, form a composite secondary sealing structure; the integrally cast flat furnace cover structure has a good service life, effectively forms a reasonable composite sealing barrier between the furnace cover and the furnace wall, greatly reduces heat dissipation loss; reduces high temperature damage to the furnace cover frame and the cover opener, and extends the service life of the furnace cover and the cover opener equipment.

[0033] 6. Compared with traditional soaking furnaces, waste heat utilization and smoke recycling are energy-saving, consumption-reducing and environmentally friendly.

[0034] In addition to recovering and reusing the waste heat of high-temperature flue gas through the air-to-gas heat exchanger, the high-temperature flue gas is recycled back to the furnace to assist the secondary combustion process, which not only saves energy, reduces emissions, and improves thermal energy utilization, but also helps to reduce the nitrogen oxide content in the exhaust gas and meet emission standards; and the induced return smoke circulation helps to stir the airflow in the furnace and promote furnace temperature balance.

[0035] 7. Compared with traditional soaking furnaces, there is no need to flip the positive and negative sides during heating

[0036] The pressurized high-temperature flue gas is circulated back into the furnace, and the secondary combustion on the back of the ingot is equivalent to the heat provided by the burner on the back of the ingot at the furnace waist. Combined with the heat exchange between the high-temperature flue gas channel and the heat-carrying furnace wall, it is equivalent to heating the positive and negative sides of the ingot. There is no need to flip the positive and negative sides during the heating process, so there is no need to open the cover three times, which greatly reduces the heat loss caused by opening the cover, and greatly reduces the formation of iron oxide scale, improves the safety of operators and equipment, and increases the yield of steel ingots. It has fast heating speed, high thermal energy utilization rate, high thermal efficiency, and also increases the output per unit time, with the dual effects of energy saving and environmental protection.

[0037] 8. Combustion control

[0038] A soaking furnace with multiple burners, separate furnace chambers, interconnected heating and smoke recirculation is equipped with a complete automated control system for optimizing the heating process, ensuring a strict air-fuel ratio and reasonable furnace pressure control, etc., so as to minimize heat loss, maximize thermal efficiency and improve furnace temperature uniformity; it adopts practical, reliable and advanced electronic control and instrumentation equipment, fully meets the modern production process of safe production, environmental protection and pollution control, and can implement digital and intelligent operation, and can realize one-key steel burning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The utility model is a schematic diagram of the furnace structure of a soaking furnace equipped with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation.

[0040] Figure 2 The utility model is a cross-sectional schematic diagram of a furnace structure of a soaking furnace equipped with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation.

[0041] Figure 3 It is a schematic diagram of the furnace pit divided furnace chamber structure described in the utility model.

[0042] Figure 4 It is a schematic diagram of the distribution of materials in the furnace chamber described in the utility model.

[0043] Figure 5 This is a schematic diagram of material distribution in a furnace pit without a common wall according to the utility model.

[0044] Figure 6 This is a schematic diagram of the shared wall structure described in the utility model.

[0045] Figure 7 This is a schematic diagram of the decomposed structure of the common wall described in the present utility model.

[0046] Reference numerals:

[0047] 1-furnace pit; 2-furnace cover; 3-burner; 4-medium pipeline; 5-sand sealing groove; 6-sealing knife; 7-fiber rope; 8-steel ingot; 9-smoke channel; 10-smoke exhaust port; 11-through hole; 12-smoke return nozzle with compressed air nozzle; 13-common wall; 14-separation furnace chamber; 15-locking brick; 16-high-strength round steel; 17-anchor hook; 18-precast block one; 19-precast block two; 20-precast block three; 21-precast block four; 22-casting body; 23-smoke collection chamber. DETAILED DESCRIPTION

[0048] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0049] like Figure 1-Figure 5 As shown, the working principle of a heat-scalding furnace equipment with multiple burners, sub-furnace chambers, interconnected heating and smoke recirculation is as follows: the common wall 13 in the furnace pit 1 divides the furnace pit into several sub-furnace chambers 14. Since the common wall 13 can be used to load steel ingots 8 back to back, the production capacity is increased by more than 50%; the sub-furnace chambers 14 divided by the common wall 13 have greater hot melting strength than the original furnace pit, and the heating load is more concentrated; a plurality of burners 3 are arranged on the upper part of the two end walls in the length direction of each sub-furnace chamber 14 to spray and burn in a relatively tangential and staggered manner, and the heating of the steel ingot 8 is fully automatically and accurately controlled. The high-temperature flue gas generated by the combustion of the burner 3 fills the furnace chamber and forms a swirling airflow in the furnace chamber under the action of the negative pressure at the furnace bottom formed by the forced exhaust of the smoke exhaust fan, and enters the built-in smoke channel 9 in the furnace wall through the smoke exhaust ports 10 of unequal cross-sections at the furnace bottom. The high-temperature flue gas airflow in the continuously heated sub-furnace chambers 14 forms a continuous and uniform temperature field of equal cross-section, thereby improving the uniformity of the furnace temperature. The smoke exhaust ports 10 with different cross-sectional areas are arranged in the furnace At the lower part of the wall and behind the steel ingot 8, high-temperature flue gas enters the built-in flue gas channel 9 of the furnace wall from the exhaust port 10. The wall inside the furnace is heated by the high-temperature flue gas to form a "fire wall". The "fire wall" exchanges heat with the steel ingot 8, increases the temperature of the steel ingot 8, and reduces the heat required for traditional heating. The entire "fire wall" is also a heat storage body in the furnace, which plays a continuous insulation role for the inside of the furnace body, improves the initial heating temperature of the soaking furnace, reduces the heating temperature difference, and shortens the heating time; the high-temperature flue gas from the compressed air nozzle of the heat exchanger is induced by the return smoke nozzle 12 to circulate back into the furnace and forms secondary combustion and burning conditions on the back of the steel ingot 8 at the waist of the furnace, burns and heats on the back of the steel ingot 8, and the positive and negative sides of the steel ingot 8 are heated at the same time, so that the steel ingot 8 is heated evenly, the medium fuel is burned thoroughly, and the positive and negative sides do not need to be turned over during the heating process; the furnace cover is not opened, the heat energy is fully utilized and not lost, the heat loss is reduced, the iron oxide scale is reduced, the yield is high, the generation of nitrogen oxides is suppressed, and the flue gas is discharged up to the standard.

[0050] like Figure 1-Figure 5As shown, a soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke recirculation includes a furnace body unit, a combustion unit, a sealing unit, a smoke exhaust unit, a control unit and other parts. The furnace body unit includes a furnace pit 1 and a furnace cover 2; the furnace pit 1 is a box-type structure, including a refractory furnace bottom with an external steel structure enclosure and surrounding furnace walls, a common wall 13 is arranged in the furnace pit 1, and the furnace pit 1 is divided into a plurality of separate furnace chambers 14. The upper part of the furnace pit 1 is equipped with a furnace cover 2 to cover the furnace pit 1, and the furnace cover 2 is composed of an integral steel structure frame and a refractory material lining, and the lining adopts a composite structure of an integrally cast refractory layer and a backing high-aluminum fiber needle-punched blanket insulation layer; the combustion unit includes a burner 3, a medium pipeline 4 and valves, etc., the burner 3 is arranged on the upper part of the end wall of each sub-furnace chamber 14, the burners 3 are arranged in a staggered manner facing each other, the outside of the burner 3 is connected to the medium pipeline 4 and the valve, the burner 3 uses a flame modulation and pulse dual-purpose burner with low nitrogen combustion, has the functions of automatic ignition and flame monitoring, and can transmit data remotely to the control unit; the sealing unit includes a fiber rope 7 arranged in the lining around the furnace cover 2 and a fiber rope 7 inlaid on the upper part of the furnace wall around the furnace pit 1. The inner and outer rings of the fiber rope 7 are in contact to form a soft seal, and the sealing knife 6 is arranged around the furnace cover 2 and the sand sealing groove 5 around the outside of the furnace wall forms a hard seal of the sand sealing structure, and the soft seal and hard seal of the furnace cover 2 and the furnace pit 1 at the furnace mouth are composed of a secondary seal to prevent the furnace gas from overflowing ; The smoke exhaust unit includes a smoke exhaust port 10, a smoke channel 9, a smoke collecting chamber 23, an underground flue, a smoke exhaust fan, a chimney, etc. The smoke exhaust port 10 is arranged at the lower part of the furnace wall of the sub-furnace chamber 14 and the lower part of both sides of the common wall 13. The high-temperature smoke from each smoke exhaust port 10 is collected in the smoke channel 9 built by the side wall and the lower part of the common wall 13. Under the suction of the smoke exhaust fan, the high-temperature smoke in the furnace pit 1 enters the lower smoke exhaust port 10 and then enters the connected smoke channel 9 built into the furnace wall and the common wall 13, turning the furnace wall into a "fire wall". The "fire wall" is equivalent to a heat carrier that performs radiation heat transfer on the steel ingot 8. The high-temperature smoke is discharged from the furnace through the smoke channel 9 in the furnace wall and enters the smoke collecting chamber 23. The high-temperature smoke is collected at the outlet When the chamber 23 is gathered, it is decelerated due to the sudden expansion of the cross-section. The high-temperature flue gas is drawn back to the furnace for circulation by the return smoke nozzle 12 with a compressed air nozzle from the hot air heat exchanger arranged on the top of the smoke collecting chamber 23, thereby realizing the function of stirring the flue gas in the furnace and performing secondary combustion at the furnace waist. The return smoke nozzle 12 with a compressed air nozzle is also equivalent to the burner of the secondary combustion at the furnace waist, which sprays and burns the back of the steel ingot 8. The front and back sides of the steel ingot 8 are heated evenly, which not only eliminates the process of opening the furnace cover three times to turn over the steel ingot 8 for reheating during the heating process, but also the return circulation of the high-temperature flue gas stirs the furnace gas, increases the combustion intensity, and makes the furnace temperature more uniform. At the same time, the dilute oxygen reduces the generation of nitrogen oxides, which saves energy and reduces emissions, and meets environmental emission standards.

[0051] like Figure 1As shown, further, the smoke exhaust port 10 is arranged around the lower part of the furnace pit side wall, and the variable cross-section smoke exhaust port 10 is designed to maintain stable, balanced and non-biased smoke exhaust in the furnace; the smoke exhaust port on the side away from the smoke collecting chamber 23 is large, and the smoke exhaust port on the side close to the smoke collecting chamber 23 gradually shrinks.

[0052] like Figure 2-Figure 3 As shown, further, the common wall 13 has built-in smoke channels 9 at the lower part on both sides, and the variable-section smoke exhaust ports 10 on both sides of the lower part of the common wall 13 are arranged at intervals and each is connected to the smoke channels 9 built-in in the furnace wall on this side, while the double smoke channels 9 are not connected.

[0053] Furthermore, above the double-row built-in smoke passages 9 at the lower part of both sides of the common wall 13, and between the smoke exhaust ports 10, a number of square through holes 11 are arranged staggered with the smoke exhaust ports. They are isolated from the smoke passages 9, transversely penetrate the common wall 13 and do not affect the structural strength of the common wall 13. These through holes 11 enable heat to flow between the sub-furnace chambers 14, thereby achieving synchronous steel burning between the sub-furnace chambers 14, and also alternate production and cyclic heating; when the load is low, reversing steel burning can be achieved between the sub-furnace chambers 14, which saves energy and reduces emissions.

[0054] like Figure 6-Figure 7 As shown, further, the common wall 13 adopts prefabricated blocks with special-shaped and parent-child locking structures as the main body of masonry, and is combined with locking bricks 15, high-strength round steel 16, anchor hooks 17, etc. to jointly lock and bind the masonry, and the reserved ends of the high-strength round steel 16, anchor hooks 17 and the anchors in the prefabricated blocks have been welded and fixed after eliminating the influence of expansion factors; the prefabricated blocks 18, 19, 20 and 21 of the common wall are connected with special-shaped parent-child structures, which are positioned by locking bricks 15, and anchor hooks 17 are set in the prefabricated blocks 3 20, 4 21 and the cast body 22 to be welded and fixed with anchors.

[0055] like Figure 2-Figure 3 , Figure 6-Figure 7 As shown, further, the high-strength round steel 16 is arranged in a diamond shape, buried in the refractory wall in a non-contact tie rod-shaped manner, and connected to the exterior wall steel structure column by nuts.

[0056] Furthermore, the round steel 16 needs to be wrapped with a zirconium-containing fiber needle-punched blanket and sealed with tape, then inserted into a PVC pipe for fixing before wall pouring, to ensure the isolation between the high-temperature environment in the furnace and the high-strength round steel 16 body. The round steel 16 is wrapped with a zirconium-containing fiber needle-punched blanket and separated from the refractory material to prevent it from being damaged by high temperature. The high-strength round steel 16 is integrated and anchored to the steel structure column of the furnace, with a compact and firm structure, which innovatively realizes the application of a shared wall structure in the middle of a high-temperature furnace without water cooling or air cooling.

[0057] Furthermore, the control unit is an automated control system for optimizing the heating process equipped with the entire equalizing furnace equipment, which can ensure strict and accurate air-fuel ratio combustion control and reasonable furnace pressure control, and adopts practical, reliable and advanced electronic control and instrumentation equipment to meet the modern production processes of safe production, environmental protection and pollution control, and can realize the one-key steel burning function. The logic programming of the main combustion air excess coefficient of the multi-burner 3 is less than 1.0 to control the combustion in the upper furnace of the furnace to form a reducing atmosphere, and distribute the excess fuel gas and the hot air released by the heat exchanger (stirring of flue gas reflux air flow) for secondary combustion and burnout at the waist of the furnace to even out the furnace temperature and prevent high-temperature oxidation of steel ingots. The combustion control adopts automatic control mode, with local and remote operation functions, meeting the safety interlocking protection, rapid cut-off, automatic cut-off protection and all safety and fault alarm functions.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

[0059] The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0060] [Example 1]

[0061] like Figure 1-Figure 7 As shown, the furnace pit 1 is divided into two separate furnace chambers 14 by a common wall 13. Steel ingots 8 are placed in the separate furnace chambers 14. The steel ingots 8 can be placed back to back on both sides of the common wall 13. The furnace pit with the common wall 13 can hold 16 steel ingots.

[0062] The burner 3 is connected to the medium pipeline 4 and the valve. The medium pipeline 4 is an air, gas pipeline and a purge, venting pipeline, etc. When the burner 3 is ignited, the air and gas are automatically mixed and sprayed in the furnace chamber for combustion.

[0063] The high-temperature flue gas after combustion enters the flue gas channel 9 built into the furnace wall through the smoke exhaust port 10 under the suction force formed by the mechanical exhaust of the smoke exhaust fan. The smoke channel 9 sends the high-temperature flue gas into the smoke collecting chamber 23. The high-temperature flue gas in the smoke collecting chamber 23 is injected back into the furnace through the pressurized hot air nozzle to form a flue gas circulation, stir the furnace gas, and perform secondary combustion and burnout at the waist of the furnace to achieve heating of the back of the steel ingot; most of the high-temperature flue gas is recovered by double preheating of the air and gas heat exchanger through the underground flue, and is discharged from the chimney after the heat energy is utilized; due to the high temperature of the flue gas in a typical intermittent high-temperature furnace, the heat exchange tube of the high-temperature section of the heat exchanger is made of 310 heat-resistant steel, and the heat exchange tube of the low-temperature section is made of 304 aluminized and 20# steel aluminized.

[0064] A flue gas passage 9 is provided inside the common wall and the surrounding furnace walls, and high-temperature flue gas flows in the flue gas passage 9. The common wall 13 and the surrounding furnace walls become a "fire wall". The "fire wall" becomes a heat exchanger during the heating of the steel ingot and exchanges heat with the steel ingot to heat the steel ingot. The heat stored inside the "fire wall" is equivalent to a heat storage body, which can effectively maintain the furnace temperature during heating and shutdown, reduce the heating time, and make the temperature change smooth and the heating balanced, effectively changing the traditional cold charging production conditions and creating hot charging production conditions with initial temperature.

[0065] [Example 2]

[0066] like Figure 1-Figure 7 As shown, the furnace pit 1 is divided into two separate furnace chambers by a common wall 13. Ingots 8 are placed in the separate furnace chambers. Ingots 8 can be placed back to back on both sides of the common wall 13. The furnace pit with the common wall 13 can hold 16 ingots. Figure 5 As shown, the furnace pit without the common wall 13 has a capacity of 12 steel ingots.

[0067] The burner 3 is connected to the medium pipeline 4, which is a pure oxygen pipeline, a gas pipeline, a purge and venting pipeline and related valves. When the burner 3 is ignited, pure oxygen and gas are mixed at a reasonable oxygen-fuel ratio given by automatic control and sprayed and burned in the furnace chamber.

[0068] The high-temperature flue gas after combustion enters the flue gas channel 9 through the smoke exhaust port, and the smoke channel 9 sends the high-temperature flue gas into the smoke collecting chamber 23. The high-temperature flue gas in the smoke collecting chamber 23 is injected back into the furnace through the high-pressure oxygen nozzle to form a flue gas circulation, stir the furnace gas and burn the embers for the second time at the waist of the furnace to achieve heating of the back of the steel ingot; most of the remaining high-temperature flue gas is preheated and recycled by the smoke pipe through the gas heat exchanger and then discharged from the chimney.

[0069] The common wall 13 and the surrounding furnace walls are internally provided with a flue gas passage 9, in which high-temperature flue gas flows, and the common wall and the surrounding furnace walls become a "fire wall". The "fire wall" becomes a heat exchanger during the heating of the steel ingot and exchanges heat with the steel ingot to heat the steel ingot. The "fire wall" stores heat energy inside and becomes a heat storage body. The furnace temperature can be continuously maintained during the heating and shutdown periods, and the heating time can be reduced, so that the temperature change is smooth and the temperature difference is balanced during the heating process. At the same time, it changes the traditional cold charging production effect and creates hot charging production conditions with the initial temperature.

Claims

1. A soaking furnace with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation, characterized in that: It includes a furnace body unit, a combustion unit, a sealing unit, a smoke exhaust unit and a control unit; the furnace body unit includes a furnace cover and a furnace pit, the furnace pit is a box-type structure, a furnace cover is arranged on the upper part of the furnace pit, and a common wall is arranged in the furnace pit to divide the furnace pit into several furnace chambers; the combustion unit includes a burner and a medium pipeline and a valve, the burner is arranged on the upper part of the end wall of each furnace chamber, the burners are arranged facing each other and staggered, and the outside of the burner is connected to the medium pipeline and the valve; the sealing unit includes a fiber rope arranged around the furnace cover and a fiber rope arranged around the furnace wall The fiber rope arranged on the upper part forms a soft seal, and the sealing knives arranged around the furnace cover cooperate with the sand sealing grooves around the furnace wall to form a hard seal; the smoke exhaust unit includes a smoke exhaust port, a smoke channel, a smoke collecting chamber, an underground flue, a smoke exhaust fan, and a chimney. The smoke exhaust port is arranged at the lower part of the furnace wall of the separate furnace chamber and the lower part of both sides of the common wall. The smoke exhaust port is connected to the smoke channel. The smoke channel exits the furnace and is collected into the smoke collecting chamber. A compressed air nozzle is arranged on the top of the smoke collecting chamber to draw the high-temperature smoke back to the furnace for circulation, stirring the furnace gas and secondary combustion.

2. A soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation according to claim 1, characterized in that: The smoke exhaust port is a variable cross-section smoke exhaust port with a larger smoke exhaust port on the side away from the smoke collecting chamber and a smaller smoke exhaust port on the side close to the smoke collecting chamber.

3. A soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation according to claim 1, characterized in that: The lower parts of both sides of the common wall are built with smoke passages, and the smoke exhaust ports on both sides are respectively connected with the smoke passages on the same side.

4. A soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation according to claim 1, characterized in that: The common wall is provided with through holes on both sides which are isolated from the smoke passage.

5. The soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation according to claim 1 is characterized in that: The common wall adopts special-shaped mother-and-child locking structure prefabricated blocks combined with locking bricks and high-strength round steel for locking and positioning. The mother-and-child special-shaped locking structure prefabricated blocks are welded and fixed with the reserved ends of the anchor hooks in the prefabricated blocks using high-strength round steel and anchor pieces.

6. A soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation according to claim 5, characterized in that: The high-strength round steel is embedded in the refractory wall in the form of a tie bar and is connected to the exterior wall steel structure column by fastening with nuts.

7. A soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation according to claim 5, characterized in that: The high-strength round steel needs to be wrapped with a zirconium-containing fiber needle-punched blanket, sealed with tape, inserted into a PVC pipe and fixed before pouring construction.

8. The soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation according to claim 1 is characterized in that: The joint between the common wall and the end wall adopts an inlaid furnace structure.

9. A soaking furnace equipment with multiple burners, separate furnace chambers, interconnected heating and smoke return circulation according to claim 1, characterized in that: The control unit is an automated control system for optimizing the heating process that is equipped on the entire soaking furnace equipment.

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