Oxygen-rich combustion heat radiation baking device

Abstract

The invention relates to the technical field of baking, and discloses an oxygen-rich combustion heat radiation baking device which comprises a baking ladle, a ladle cover, a roaster and a flue gas circulation unit. The ladle cover covers the top opening of the baking ladle; a smoke outlet is formed in the ladle cover and is communicated with the interior of the baking ladle; the roaster comprises a heat radiation sleeve, and the heat radiation sleeve is fixed to the ladle cover, located in the roasting ladle and extends in the first direction; the first direction is a vertical direction; an air inlet of the smoke circulating unit is communicated with the smoke outlet, and an air outlet is communicated with the interior of the baking ladle; a combustion channel for fuel gas and oxygen is formed in the heat radiation sleeve, and smoke flows out of an outlet of the heat radiation sleeve, then sequentially flows through the interior of the baking ladle, the smoke outlet and the smoke circulation unit and enters the baking ladle again through the smoke circulation unit to circularly flow. According to the invention, the baking temperature can be quickly increased to the required level by only needing a small amount of fuel gas, the baking time is shortened, the heat utilization efficiency is improved, and zero emission of flue gas is realized.

Description

Technical Field

[0001] The invention relates to the technical field of baking, in particular to a multi-oxygen combustion heat radiation baking device. Background Art

[0002] In the steel industry, a core link of the steelmaking process involves ladle baking, tundish baking, alloy baking heating and scrap steel baking heating. The energy consumption level and baking heating effect of these processes have a direct impact on production efficiency and cost control. However, the traditional baking machine consumes significantly more gas during the combustion process, which not only increases energy costs, but also leads to a corresponding increase in smoke exhaust. What is more serious is that the high-temperature flue gas generated by the baking machine after combustion is directly discharged into the workshop without effective utilization, which not only wastes thermal energy resources, but also may have an adverse effect on the workshop environment. In addition, the baking temperature of traditional baking machines is generally low, which directly prolongs the time required for baking and reduces production efficiency. At the same time, since the baking temperature is difficult to meet the process requirements, it may affect the quality and stability of subsequent steelmaking processes. Summary of the invention

[0003] In view of this, the present invention provides an oxygen-combustion heat radiation baking device to solve the problems of large smoke exhaust volume, waste of heat energy resources and low production efficiency of traditional baking devices.

[0004] The present invention provides a multi-oxygen combustion heat radiation baking device, comprising a baking bag, a bag cover, a baking device and a smoke circulation unit; the baking bag is provided with an opening at the top; the bag cover is arranged at the top opening of the baking bag; and the bag cover is provided with a smoke exhaust port, which is connected to the interior of the baking bag; the baking device is fixed on the bag cover; the baking device comprises a heat radiation sleeve, which is fixed on the bag cover, is located in the baking bag, and extends along a first direction; the baking device is used to transport fuel gas and oxygen into the heat radiation sleeve; the outlet at the bottom of the heat radiation sleeve is connected to the interior of the baking bag; the first direction is a vertical direction; the air inlet of the smoke circulation unit is connected to the smoke exhaust port, and the air outlet is connected to the interior of the baking bag; wherein the interior of the heat radiation sleeve is a combustion channel for fuel gas and oxygen, and the smoke flows out from the outlet of the heat radiation sleeve, and then flows through the interior of the baking bag, the smoke exhaust port, and the smoke circulation unit in sequence, and enters the interior of the baking bag again by the smoke circulation unit for circulation.

[0005] Beneficial effects: The roaster transmits fuel gas and oxygen into the heat radiation sleeve, uses pure oxygen as a combustion aid to burn with fuel gas, and generates high-temperature flames and flue gas. The high-temperature flames and flue gas pass through the heat radiation sleeve that extends into the baking bag, and evenly heat the inside of the baking bag in the form of heat radiation. Since the heat radiation sleeve extends in the vertical direction, the back pressure in the baking bag is small, the high-temperature area of ​​the flame can extend to the bottom of the baking bag, and the flue gas stays in the baking bag for a long time, thereby making full use of the heat of the flue gas, reducing the heat loss carried away by the flue gas, and significantly reducing energy consumption. In addition, the flue gas returns from the bottom of the heat radiation sleeve to the upper part of the baking bag, and is reintroduced into the baking bag through the flue gas circulation unit for recycling, so that only a small amount of fuel gas is needed to quickly raise the baking temperature to the required level, which not only shortens the baking time, but also greatly improves the utilization efficiency of heat. At the same time, since pure oxygen is used as a combustion aid, the high-temperature flue gas generated during the combustion process is mainly high-purity carbon dioxide gas. In addition to part of the flue gas being recycled in the baking bag, the remaining high-purity carbon dioxide gas can be recycled and used in other industrial processes, thus achieving zero flue gas emissions, which not only reduces gas consumption, but also achieves clean utilization of gas, with significant energy-saving and emission-reduction effects, achieving the goal of low-carbon and zero emissions. The overall design optimizes the utilization efficiency of heat, reduces energy consumption, achieves efficient and uniform heating effects, and reduces pollution to the environment.

[0006] In an optional embodiment, it further includes a moving mechanism and a control system; the moving mechanism is fixedly connected to the bag cover; the bag cover can be moved to a fixed position where the cover is arranged on the baking bag, and a separated position separated from the baking bag under the drive of the moving mechanism; the control system is communicatively connected to the baking machine; when the bag cover is in the fixed position, the control system controls the baking machine to start; when the bag cover is in the separated position, the control system controls the baking machine to shut down.

[0007] Beneficial effects: By setting up a moving mechanism, it is convenient to move the bag cover; by setting up a control system, when the bag cover is accurately covered on the baking bag, the control system immediately starts the baking machine for heating, and when the bag cover is separated from the baking bag, the control system will shut down the baking machine, thereby improving safety.

[0008] In an optional embodiment, the moving mechanism includes a slide rail, a translation module and a lifting module; the slide rail is arranged adjacent to the baking bag and extends along the second direction; the translation module is slidably arranged on the slide rail along the second direction; the lifting module is fixed to a side of the translation module close to the baking bag, and the bag cover is slidably arranged on the lifting module along the first direction; the second direction is perpendicular to the first direction.

[0009] Beneficial effects: A translation module is slidably arranged on the slide rail along the second direction, so that the translation module can move freely on the slide rail, thereby adjusting its position relative to the baking bag in the second direction; the lifting module is fixed on the side of the translation module close to the baking bag, ensuring that the lifting module can move synchronously with the movement of the translation module, so that the moving mechanism has high flexibility in both horizontal and vertical directions, and since the bag cover is slidably arranged on the lifting module along the first direction, the position and height of the bag cover relative to the baking bag can be conveniently adjusted. By combining the functions of the translation module and the lifting module, the entire system can achieve all-round and precise control of the bag cover position, providing great convenience and flexibility for the baking process.

[0010] In an optional embodiment, a first limit switch is provided on the lifting module, and the first limit switch is communicatively connected with the control system. When the bag cover is in a fixed position, the bag cover contacts the first limit switch, and the control system controls the baking machine to start.

[0011] Beneficial effects: By setting the first limit switch, the roaster is allowed to ignite and start only after the bag cover reaches its predetermined working position; an interlocking mechanism between the bag cover and the roaster is realized, thereby enhancing the safety of operation.

[0012] In an optional embodiment, a second limit switch is further provided on the lifting module, and the second limit switch is located above the first limit switch and is spaced apart from the first limit switch; the second limit switch is communicatively connected to the control system, and when the package cover contacts the second limit switch, the control system controls the translation module to move along the second direction to the side away from the baking package.

[0013] Beneficial effect: By setting the second limit switch, the mobile trolley can move the bag cover to the rear side of the bag only when the bag cover is lifted to the set position, thereby avoiding interference between the heat radiation sleeve and the baking bag.

[0014] In an optional embodiment, the roaster also includes a gas spray gun, an oxygen spray gun and an ignition gun; the gas spray gun is fixed on the side of the cover facing away from the baking bag, and is used to transport gas into the heat radiation sleeve; the oxygen spray gun is spaced apart from the gas spray gun, and is fixed on the side of the cover facing away from the baking bag, and is used to transport oxygen into the heat radiation sleeve; the ignition gun is spaced apart from the gas spray gun and the oxygen spray gun, and is fixed on the side of the cover facing away from the baking bag, and is used to ignite a mixture of gas and oxygen.

[0015] Beneficial effects: The gas is delivered through the gas spray gun, and the oxygen is delivered through the oxygen spray gun, ensuring that the gas and oxygen can be sprayed out separately and independently at high speed; the mixture of gas and oxygen is ignited by the ignition gun, thereby achieving an efficient and stable combustion process; this design not only improves the combustion efficiency, but also ensures the safety and controllability of the operation.

[0016] In an optional embodiment, it also includes a gas control unit and an oxygen control unit; the gas control unit is connected to the gas spray gun for supplying gas to the gas spray gun; the oxygen control unit is connected to the oxygen spray gun for supplying oxygen to the oxygen spray gun; the control system is communicatively connected to both the gas control unit and the oxygen control unit, and adjusts and controls the gas flow and oxygen flow according to a preset ratio of oxygen to gas.

[0017] Beneficial effect: The control system adjusts and controls the gas flow rate and oxygen flow rate according to the preset ratio of oxygen to gas, and dynamically adjusts the gas flow rate and oxygen flow rate, which not only ensures the precise control of the gas flow rate and oxygen flow rate, but also ensures the rapidity of response, thereby effectively avoiding the problem of unstable combustion caused by flow fluctuations.

[0018] In an optional embodiment, the gas control unit also includes a first pressure transmitter, which is used to detect the gas pressure and communicate with the control system. When the gas pressure exceeds a preset value, the control system controls the cutting off of the gas, oxygen and circulating flue gas supply.

[0019] Beneficial effect: By setting the first pressure transmitter, when the gas is lower than the set value when the roaster is working, the first pressure transmitter sends an alarm signal to the control system, and the control system simultaneously cuts off the supply of gas, oxygen and circulating flue gas, and restarts the equipment after the fault is eliminated, thereby improving safety.

[0020] In an optional embodiment, the oxygen control unit also includes a second pressure transmitter, which is used to detect the oxygen pressure and is communicated with the control system. When the oxygen pressure exceeds a preset value, the control system controls the cutting off of the fuel gas, oxygen and circulating flue gas supply.

[0021] Beneficial effect: By setting up the second pressure transmitter, when the oxygen pressure is abnormal such as overpressure or underpressure, the second pressure transmitter will immediately send out an alarm signal, and the control system will respond quickly to cut off the supply of fuel gas, oxygen and circulating flue gas to prevent potential dangers. The system can only be restarted after ensuring that the fault has been completely eliminated, which improves safety.

[0022] In an optional implementation, the gas control unit further includes a gas leakage alarm, and the gas leakage alarm is used to detect gas leakage.

[0023] Beneficial effect: By setting up a gas leak alarm, when a gas leak occurs, the gas leak alarm will send out an alarm signal, so that relevant personnel can quickly take measures to eliminate the leak. After ensuring that the leak has been thoroughly dealt with, the equipment can be restarted, thereby improving the safety of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of the connection between the baking bag and the bag cover according to an embodiment of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a bag cover in a fixed position according to an embodiment of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a package cover in a separated position according to an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1. Baking bag; 2. Bag cover; 21. Smoke exhaust port; 3. Baking device; 31. Heat radiation sleeve; 32. Gas spray gun; 33. Oxygen spray gun; 34. Ignition gun; 35. Flame detector; 36. Circulating flue gas spray gun; 4. Flue gas circulation unit; 5. Moving mechanism; 51. Slide rail; 52. Translation module; 521. Moving trolley; 522. First telescopic cylinder; 53. Lifting module; 531. Steel bracket; 532. Second telescopic cylinder; 54. Connecting bracket; 6. Gas control unit; 7. Oxygen control unit. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0032] According to an embodiment of the present invention, on the one hand, a multi-oxygen combustion heat radiation baking device is provided, comprising a baking bag 1, a bag cover 2, a baking device 3 and a smoke circulation unit 4; the baking bag 1 is provided with an opening at the top; the bag cover 2 is provided at the top opening of the baking bag 1; and the bag cover 2 is provided with a smoke exhaust port 21, and the smoke exhaust port 21 is connected to the inside of the baking bag 1; the baking device 3 is fixed on the bag cover 2; the baking device 3 comprises a heat radiation sleeve 31, which is fixed on the bag cover 2, is located in the baking bag 1, and extends along a first direction; the baking device 3 is used to radiate the heat radiation to the baking bag 1 Gas and oxygen are transported in the sleeve 31; the outlet at the bottom of the heat radiation sleeve 31 is connected to the interior of the baking bag 1; the first direction is the vertical direction; the smoke circulation unit 4, the air inlet is connected to the smoke exhaust port 21, and the air outlet is connected to the interior of the baking bag 1; wherein the interior of the heat radiation sleeve 31 is a combustion channel for gas and oxygen, and the smoke flows out from the outlet of the heat radiation sleeve 31, and then flows through the interior of the baking bag 1, the smoke exhaust port 21, and the smoke circulation unit 4 in sequence, and enters the interior of the baking bag 1 again from the smoke circulation unit 4 for circulation.

[0033] The roaster 3 delivers fuel gas and oxygen into the heat radiation sleeve 31, uses pure oxygen as a combustion aid to burn with fuel gas, and generates high-temperature flames and flue gas. The high-temperature flames and flue gas pass through the heat radiation sleeve 31 extending into the baking bag 1, and evenly heat the inside of the baking bag 1 in the form of heat radiation. Since the heat radiation sleeve 31 extends in the vertical direction, the back pressure in the baking bag 1 is small, the high-temperature area of ​​the flame can extend to the bottom of the baking bag 1, and the flue gas stays in the baking bag 1 for a long time, thereby making full use of the heat of the flue gas, reducing the heat loss carried away by the flue gas, and significantly reducing energy consumption. In addition, the flue gas returns from the bottom of the heat radiation sleeve 31 to the upper part of the baking bag 1, and is reintroduced into the baking bag 1 through the flue gas circulation unit 4 for recycling, so that only a small amount of fuel gas is needed to quickly raise the baking temperature to the required level, which not only shortens the baking time, but also greatly improves the utilization efficiency of heat. At the same time, since pure oxygen is used as a combustion aid, the high-temperature flue gas generated during the combustion process is mainly high-purity carbon dioxide gas. In addition to part of the flue gas being recycled in the baking bag 1, the remaining high-purity carbon dioxide gas can be recycled and used in other industrial processes, thereby achieving zero flue gas emissions, which not only reduces gas consumption, but also achieves clean utilization of gas, with significant energy-saving and emission-reduction effects, achieving the goal of low-carbon and zero emissions. The overall design optimizes the utilization efficiency of heat, reduces energy consumption, achieves efficient and uniform heating effects, and reduces pollution to the environment.

[0034] In a specific implementation, the wall of the heat radiation sleeve 31 is a heat-resistant steel wall.

[0035] In a specific embodiment, in the first direction, the length of the heat radiation sleeve 31 is smaller than the depth of the baking package 1 , and the bottom of the heat radiation sleeve 31 is spaced apart from the bottom wall of the baking package 1 .

[0036] Specifically, nitrogen accounts for about 78% and oxygen accounts for about 21% in the air. In the traditional combustion process, nitrogen does not contribute to combustion, but absorbs a large amount of heat and is heated to the baking temperature, while generating nitrogen oxides. These heated nitrogen gases are eventually discharged from the baking bag 1 in the form of high-temperature flue gas, which not only causes a large amount of heat loss, but also emits a large amount of flue gas and pollutants, which has a negative impact on the environment. In contrast, the multi-oxygen combustion technology using pure oxygen combustion in this application can effectively avoid the ineffective heat absorption and emission of nitrogen in the air. Since pure oxygen combustion does not rely on nitrogen in the air, the amount of flue gas generated is significantly reduced, thereby greatly improving the radiation heat exchange efficiency and the effective utilization rate of fuel gas. In addition, since there is no large amount of nitrogen involved in the combustion, the amount of nitrogen oxides generated in the flue gas is also significantly reduced, which can save more than 50% of gas consumption and reduce carbon dioxide emissions by about 50%, achieving the dual effects of energy saving and emission reduction. By reducing ineffective heat loss and pollutant emissions, pure oxygen combustion not only improves energy utilization efficiency, but also significantly reduces the impact on the environment. It does not need to rely on blowers for combustion, so it can directly save the related costs of purchasing and maintaining blowers, further realizing economic cost savings.

[0037] Specifically, the traditional air-assisted combustion method uses ordinary air as a combustion aid, resulting in a large amount of smoke and a high back pressure inside the bag, and the gas inlet and smoke outlet are both on the side where the bag cover 2 is located. Affected by the rising buoyancy of the high-temperature smoke, the burning flame is difficult to penetrate into the bottom of the baking bag 1, but is directly discharged from the bag cover 2. This design causes the bottom temperature of the baking bag 1 to be low, while the upper temperature is too high, resulting in uneven baking temperature distribution, poor baking effect, and a large amount of heat waste. The design of the extended heat radiation sleeve 31 in the present application allows the high-temperature area to cover the bottom of the baking bag 1, while extending the residence time of the smoke in the baking bag 1, so that the upper, middle and lower parts of the baking bag 1 can be evenly heated, thereby ensuring a uniform distribution of baking temperature. This not only improves the baking effect, but also significantly improves the efficiency of heat utilization, avoiding the problem of heat waste in traditional methods.

[0038] Specifically, since the theoretical combustion temperature of the same fuel is not fixed, but is affected by the volume ratio of oxygen in the combustion air, as the volume ratio of oxygen in the combustion air increases, the theoretical combustion temperature of the fuel will also increase accordingly. In this application, by optimizing the combustion process, the theoretical combustion temperature of low calorific value fuel gas can be increased so that it can better meet the baking requirements. Therefore, the volume ratio of oxygen in the combustion air can be reasonably adjusted, and low calorific value fuel gas can be selected as the baking fuel to achieve the economical utilization of high calorific value fuel gas.

[0039] Specifically, the cover 2 is composed of a steel structure, a zirconium-containing refractory fiber assembly, an insulating plate, and a connecting device; and plays the role of heat preservation, installation, and fixing of the roaster 3.

[0040] In one embodiment, it also includes a moving mechanism 5 and a control system; the moving mechanism 5 is fixedly connected to the bag cover 2; the bag cover 2 can be moved to a fixed position where the cover is arranged on the baking bag 1, and a separated position separated from the baking bag 1 under the drive of the moving mechanism 5; the control system is communicatively connected with the baking machine 3; when the bag cover 2 is in the fixed position, the control system controls the baking machine 3 to start; when the bag cover 2 is in the separated position, the control system controls the baking machine 3 to shut down.

[0041] By setting up the moving mechanism 5, it is convenient to move the bag cover 2; by setting up the control system, when the bag cover 2 is accurately covered on the baking bag 1, the control system immediately starts the baking machine 3 for heating, and when the bag cover 2 is separated from the baking bag 1, the control system will turn off the baking machine 3, thereby improving safety.

[0042] Specifically, the cover 2 can be lifted or moved only after the roaster 3 is turned off and the flame is completely extinguished.

[0043] In one embodiment, the moving mechanism 5 includes a slide rail 51, a translation module 52 and a lifting module 53; the slide rail 51 is arranged adjacent to the baking bag 1 and extends along the second direction; the translation module 52 is slidably arranged on the slide rail 51 along the second direction; the lifting module 53 is fixed to a side of the translation module 52 close to the baking bag 1, and the bag cover 2 is slidably arranged on the lifting module 53 along the first direction; the second direction is perpendicular to the first direction.

[0044] A translation module 52 is slidably arranged on the slide rail 51 along the second direction, so that the translation module 52 can move freely on the slide rail 51, thereby adjusting its position relative to the baking bag 1 in the second direction; the lifting module 53 is fixed on the side of the translation module 52 close to the baking bag 1, ensuring that the lifting module 53 can move synchronously with the movement of the translation module 52, so that the moving mechanism 5 has high flexibility in both horizontal and vertical directions. Since the bag cover 2 is slidably arranged on the lifting module 53 along the first direction, the position and height of the bag cover 2 relative to the baking bag 1 can be conveniently adjusted. By combining the functions of the translation module 52 and the lifting module 53, the entire system can achieve all-round and precise control of the position of the bag cover 2, providing great convenience and flexibility for the baking process.

[0045] In a specific embodiment, the translation module 52 includes a moving trolley 521, a first hydraulic station and a first telescopic cylinder 522; the first telescopic cylinder 522 is connected to the first hydraulic station; the first telescopic cylinder 522 extends along the second direction, and the moving trolley 521 is fixedly connected to the telescopic end of the first telescopic cylinder 522. The lifting module 53 includes a steel bracket 531, a second hydraulic station and a second telescopic cylinder 532; the second telescopic cylinder 532 is connected to the second hydraulic station; the second telescopic cylinder 532 is arranged on a side of the steel bracket 531 close to the baking bag 1 and extends along the first direction, and the bag cover 2 is fixedly connected to the telescopic end of the second telescopic cylinder 532.

[0046] In one embodiment, a first limit switch is provided on the lifting module 53, and the first limit switch is communicated with the control system. When the bag cover 2 is in a fixed position, the bag cover 2 contacts the first limit switch, and the control system controls the roaster 3 to start.

[0047] By setting the first limit switch, the roaster 3 is allowed to ignite and start only after the bag cover 2 reaches its predetermined working position; an interlocking mechanism between the bag cover 2 and the roaster 3 is realized, thereby enhancing the safety of operation.

[0048] Specifically, when the bag cover 2 is lowered to the fixed position, the first limit switch is triggered. At this time, the control system receives a signal from the first limit switch, confirms that the bag cover 2 has reached the correct position, and then the control system controls the roaster 3 to start.

[0049] In one embodiment, a second limit switch is further provided on the lifting module 53, and the second limit switch is located above the first limit switch and is spaced apart from the first limit switch; the second limit switch is communicated with the control system, and when the bag cover 2 contacts the second limit switch, the control system controls the translation module 52 to move along the second direction to the side away from the baking bag 1.

[0050] By setting the second limit switch, it is achieved that only when the bag cover 2 is lifted to the set position, the moving trolley 521 can move the bag cover 2 to the rear side of the bag, avoiding interference between the heat radiation sleeve 31 and the baking bag 1.

[0051] Specifically, when the bag cover 2 is lifted to the set position, the second limit switch is triggered. At this time, the moving trolley 521 receives the signal from the second limit switch and confirms that the bag cover 2 has reached the correct position. Then the translation module 52 is started and performs the operation of moving the bag cover 2 to the rear side of the bag; this not only ensures the accuracy of the operation, but also greatly improves the safety and efficiency of the entire process.

[0052] In a specific embodiment, the first limit switch and the second limit switch are both arranged on the steel bracket 531, and a connecting bracket 54 is arranged on the bag cover 2, which is connected to the telescopic end of the second telescopic oil cylinder 532, and the connecting bracket 54 is slidably connected to the steel bracket 531; when the baking bag 1 is in place, the translation module 52 translates the bag cover 2 to the upper part of the baking bag 1, and then the lifting module 53 moves the bag cover 2 downward until the cover is arranged on the baking bag 1, at which time the heat radiation sleeve 31 is located inside the baking bag 1, the connecting bracket 54 contacts the first limit switch, and the control system controls the baking device 3 to start baking and burning; after baking is completed, the control system controls the baking device 3 to close, and then the lifting module 53 rises until the heat radiation sleeve 31 is moved out of the baking bag 1, and then the connecting bracket 54 contacts the second limit switch, at which time the translation module 52 translates the bag cover 2 to the rear of the bag, and finally the overhead crane moves the baking bag 1 away.

[0053] In a specific embodiment, in the first direction, the distance between the first limit switch and the second limit switch is greater than the length of the heat radiation sleeve 31 .

[0054] In one embodiment, the roaster 3 also includes a gas spray gun 32, an oxygen spray gun 33 and an ignition gun 34; the gas spray gun 32 is fixed on the side of the bag cover 2 away from the baking bag, and is used to transport gas into the heat radiation sleeve 31; the oxygen spray gun 33 is spaced apart from the gas spray gun 32, and is fixed on the side of the bag cover 2 away from the baking bag, and is used to transport oxygen into the heat radiation sleeve 31; the ignition gun 34 is spaced apart from the gas spray gun 32 and the oxygen spray gun 33, and is fixed on the side of the bag cover 2 away from the baking bag, and is used to ignite a mixture of gas and oxygen.

[0055] The gas is delivered through the gas spray gun 32, and the oxygen is delivered through the oxygen spray gun 33, ensuring that the gas and oxygen can be sprayed out separately and independently at high speed; the mixture of gas and oxygen is ignited by the ignition gun 34, thereby achieving an efficient and stable combustion process; this design not only improves the combustion efficiency, but also ensures the safety and controllability of the operation.

[0056] Specifically, since pure oxygen is used as a combustion aid, the combustion aid no longer contains nitrogen, and the concentration and partial pressure of triatomic gases in the flame and flue gas are significantly increased. According to gas radiation theory, only triatomic and polyatomic gases have strong radiation capabilities, so the radiation capacity of flue gas is greatly improved.

[0057] Specifically, the oxyfuel combustion using pure oxygen as the combustion aid adopts a diffuse flameless combustion mode, and the effective high temperature zone of the flame has the characteristics of sufficient rigidity and large volume, which can fully stir the smoke in the baking bag 1, thereby achieving uniform distribution of the baking temperature. This uniform temperature distribution not only improves the baking effect, but also effectively prolongs the service life of the lining of the baking bag 1.

[0058] In a specific embodiment, the ignition gun 34 is an automatic ignition gun 34 that adopts a tail premixing ignition method. The gas and the combustion aid are premixed at the tail of the ignition gun 34, and then ignited by a spark plug. The burning gas is sprayed through the barrel to the front of the ignition gun 34 to ignite the main fuel of the roaster 3. The ignition gun 34 is also equipped with a flame detector 35 for real-time monitoring and judging whether the ignition is successful. The tail premixing ignition type automatic ignition gun 34 effectively solves the problems of high failure rate and difficulty in stable operation of the traditional end ignition ignition gun 34 in a high temperature environment. Therefore, when using the tail premixing ignition type automatic ignition gun 34, the roaster 3 no longer needs to be set with a long open flame, which not only simplifies the system structure, but also significantly reduces the consumption of gas and improves the overall energy efficiency.

[0059] Specifically, a burner brick is installed at the center of the cover 2 for fixing the gas spray gun 32 , the oxygen spray gun 33 , the heat radiation sleeve 31 , the ignition gun 34 and the flame detector 35 .

[0060] In one embodiment, it also includes a gas control unit 6 and an oxygen control unit 7; the gas control unit 6 is connected to the gas spray gun 32, and is used to supply gas to the gas spray gun 32; the oxygen control unit 7 is connected to the oxygen spray gun 33, and is used to supply oxygen to the oxygen spray gun 33; the control system is communicatively connected to both the gas control unit 6 and the oxygen control unit 7, and adjusts and controls the gas flow rate and the oxygen flow rate according to a preset ratio of oxygen to gas.

[0061] The control system adjusts and controls the gas flow and oxygen flow according to the preset ratio of oxygen to gas, and dynamically adjusts the gas flow and oxygen flow, which not only ensures the precise control of the gas flow and oxygen flow, but also ensures the rapidity of response, thereby effectively avoiding the problem of unstable combustion caused by flow fluctuations.

[0062] In a specific implementation, a proportional control method of flow measurement closed-loop control is adopted, and oxygen and fuel gas are supplied in a precise ratio.

[0063] Specifically, when ordinary air is used to assist combustion, the combustion air flow rate is large, the pipe diameter is thick, and the speed and accuracy of the regulating valve are not ideal. When oxygen is used to assist combustion, the flow meter pipe diameter is greatly reduced, the oxygen-fuel ratio is sensitively adjusted, and only a small amount of oxygen is needed for complete mixing. Therefore, the oxygen and fuel gas can be accurately proportioned to reduce fuel gas waste.

[0064] In one embodiment, the gas control unit 6 also includes a first pressure transmitter, which is used to detect the gas pressure and communicate with the control system. When the gas pressure exceeds a preset value, the control system controls the cutting off of the gas, oxygen and circulating flue gas supply.

[0065] By setting the first pressure transmitter, when the fuel gas is lower than the set value when the roaster 3 is working, the first pressure transmitter sends an alarm signal to the control system, and the control system simultaneously cuts off the fuel gas, oxygen and circulating flue gas supply, and restarts the equipment after the fault is eliminated, thereby improving safety.

[0066] In one embodiment, the oxygen control unit 7 further includes a second pressure transmitter, which is used to detect the oxygen pressure and is communicated with the control system. When the oxygen pressure exceeds a preset value, the control system controls the cutting off of the supply of fuel gas, oxygen and circulating flue gas.

[0067] By setting up a second pressure transmitter, when the oxygen pressure is abnormal such as overpressure or underpressure, the second pressure transmitter will immediately send out an alarm signal, and the control system will respond quickly to cut off the supply of fuel gas, oxygen and circulating flue gas to prevent potential dangers. The system can only be restarted after ensuring that the fault has been completely eliminated, which improves safety.

[0068] In one embodiment, the gas control unit 6 further includes a gas leakage alarm, which is used to detect gas leakage.

[0069] By setting up a gas leak alarm, when a gas leak occurs, the gas leak alarm will send out an alarm signal, so that relevant personnel can quickly take measures to eliminate the leak. After ensuring that the leak has been thoroughly dealt with, the equipment can be restarted, thereby improving the safety of the production process.

[0070] In a specific implementation, the gas control unit 6 is composed of a filter, a first manual valve, a gas shut-off valve, a blind plate valve, a gas flow meter, a gas flow regulating valve, an ignition branch and a gas branch; the control system receives the gas flow data from the gas flow meter, and controls the valve opening of the gas flow regulating valve according to the gas flow data, thereby realizing the regulation of the gas flow.

[0071] In a specific implementation, the gas branch pipeline and the first manual valve, the gas shut-off valve, the blind plate valve, the gas flow regulating valve, the ignition branch pipeline and other structures in the gas control unit 6 are all provided with gas leakage alarms.

[0072] In a specific implementation, the oxygen control unit 7 is composed of an oxygen shut-off valve, an oxygen flow regulating valve, an oxygen flow meter, an oxygen pressure regulating valve, a first thermal resistor, a second manual valve, etc.; the control system receives the oxygen flow data from the oxygen flow meter, and controls the valve opening of the oxygen flow regulating valve according to the oxygen flow data, thereby realizing the regulation of the gas flow.

[0073] In a specific embodiment, the oxygen control unit 7 also includes an oxygen pipeline, which is made of stainless steel. The oxygen pipeline and its accessories are degreased and deoiled, and are designed and manufactured in strict accordance with the specifications of the oxygen pipeline. The oxygen pipeline is equipped with anti-static facilities to ensure safe use.

[0074] In a specific implementation, the flue gas circulation unit 4 is composed of a high-temperature circulation fan, a flue gas flow regulating valve, a flue gas flow meter, a third pressure transmitter, a second thermal resistor, a third manual valve, etc.; the control system receives the flue gas flow data from the flue gas flow meter, and controls the valve opening of the flue gas flow regulating valve according to the flue gas flow data, thereby realizing the regulation of the flue gas flow.

[0075] Specifically, the present application has two operating modes: manual and automatic. In manual mode, the operator can directly adjust the gas flow, oxygen flow and circulating flue gas volume through the first manual valve, the second manual valve and the third manual valve; in automatic mode, the control system relies on the proportional-integral-differential (PID) control strategy to achieve precise flow control. In automatic mode, once the gas flow parameters are set, the oxygen flow will automatically track and adjust according to the preset ratio, and all flow control parameters can be flexibly adjusted through an intuitive human-machine interface.

[0076] In a specific embodiment, the roaster 3 further comprises a circulating fume lance 36 , which is connected to the outlet of the fume circulation unit 4 , is fixed to the side of the bag cover 2 facing away from the baking bag 1 , and is connected to the interior of the baking bag 1 .

[0077] In a specific implementation, both the gas shut-off valve and the oxygen shut-off valve are connected to the control system for communication, so that the control system can quickly cut off the gas and oxygen supply.

[0078] Preferably, the roaster 3 adopts program control to intelligently and automatically adjust the operating parameters. The roaster 3 is provided with a thermocouple temperature detection and adjustment system. The maximum baking temperature can be set by the temperature detection instrument arranged on the bag cover 2. The temperature is automatically increased according to the temperature curve, and the baking and heat preservation are automatically performed. When the temperature is low, the gas supply is automatically increased, and when the temperature is high, the gas supply is automatically reduced.

[0079] Preferably, the control system consists of a programmable logic controller, which cooperates with intelligent instruments and various valves to form a complete control system. The system integrates multiple functional modules such as thermocouple temperature detection and regulation system, gas flow detection and regulation system, oxygen flow regulation and detection system, circulating flue gas flow detection and regulation system, safety protection and fault alarm system, and air / fuel ratio setting system. The operator can select manual or automatic operation mode according to actual needs on the human-machine interface on the operation box on the side of the machine. The operation of completing the control process is realized through a programmable logic controller, and the flow signal and pressure signal are transmitted to the programmable logic controller using 4-20mA. All instrument signals such as pressure, flow, valve opening and fire detection signal enter the programmable logic controller system for programming and configuration.

[0080] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An oxygen combustion heat radiation baking device, characterized in that: include: A baking bag (1) having an opening at the top; A bag cover (2) is arranged at the top opening of the baking bag (1); the bag cover (2) is provided with a smoke exhaust port (21), and the smoke exhaust port (21) is connected to the interior of the baking bag (1); A roaster (3) is fixed on the bag cover (2); the roaster (3) comprises a heat radiation sleeve (31), the heat radiation sleeve (31) is fixed on the bag cover (2), is located in the baking bag (1), and extends along a first direction; the roaster (3) is used to transport fuel gas and oxygen into the heat radiation sleeve (31); an outlet at the bottom of the heat radiation sleeve (31) is connected to the interior of the baking bag (1); the first direction is a vertical direction; A smoke circulation unit (4), the air inlet of which is connected to the smoke exhaust port (21), and the air outlet of which is connected to the interior of the baking bag (1); The interior of the heat radiation sleeve (31) is a combustion channel for fuel gas and oxygen, and the smoke flows out from the outlet of the heat radiation sleeve (31), then flows through the interior of the baking bag (1), the smoke exhaust port (21), and the smoke circulation unit (4) in sequence, and then enters the interior of the baking bag (1) again from the smoke circulation unit (4) to circulate.

2. The multi-oxygen combustion heat radiation baking device according to claim 1, characterized in that: Also includes: A moving mechanism (5) is fixedly connected to the bag cover (2); the bag cover (2) has a fixed position where it is moved to the baking bag (1) under the drive of the moving mechanism (5), and a separation position where it is separated from the baking bag (1); A control system is connected to the roaster (3) in communication; when the bag cover (2) is in the fixed position, the control system controls the roaster (3) to start; when the bag cover (2) is in the separated position, the control system controls the roaster (3) to shut down.

3. The multi-oxygen combustion heat radiation baking device according to claim 2, characterized in that: The moving mechanism (5) comprises: A slide rail (51) is disposed adjacent to the baking bag (1) and extends along a second direction; A translation module (52) is slidably arranged on the slide rail (51) along a second direction; A lifting module (53) is fixed on a side of the translation module (52) close to the baking bag (1); the bag cover (2) is slidably arranged on the lifting module (53) along the first direction; and the second direction is perpendicular to the first direction.

4. The multi-oxygen combustion heat radiation baking device according to claim 3, characterized in that: The lifting module (53) is provided with a first limit switch, and the first limit switch is in communication connection with the control system. When the bag cover (2) is in the fixed position, the bag cover (2) contacts the first limit switch, and the control system controls the roaster (3) to start.

5. The multi-oxygen combustion heat radiation baking device according to claim 4, characterized in that: The lifting module (53) is also provided with a second limit switch, which is located above the first limit switch and spaced apart from the first limit switch; the second limit switch is communicatively connected with the control system, and when the bag cover (2) contacts the second limit switch, the control system controls the translation module (52) to move along the second direction to the side away from the baking bag (1).

6. The multi-oxygen combustion heat radiation baking device according to any one of claims 2 to 5, characterized in that: The roaster (3) further comprises: A gas spray gun (32), fixed on a side of the bag cover (2) away from the baking bag, and used for delivering gas into the heat radiation sleeve (31); an oxygen spray gun (33) arranged at a distance from the gas spray gun (32), fixed on a side of the bag cover (2) away from the baking bag, and used for delivering oxygen into the heat radiation sleeve (31); The ignition gun (34) is arranged at intervals from the gas spray gun (32) and the oxygen spray gun (33), fixed on the side of the bag cover (2) away from the baking bag, and is used to ignite a mixture of gas and oxygen.

7. The multi-oxygen combustion heat radiation baking device according to claim 6, characterized in that: Also includes: a gas control unit (6), connected to the gas spray gun (32) and used for supplying gas to the gas spray gun (32); an oxygen control unit (7), connected to the oxygen spray gun (33) and used for supplying oxygen to the oxygen spray gun (33); The control system is in communication connection with both the gas control unit (6) and the oxygen control unit (7), and adjusts and controls the gas flow rate and oxygen flow rate according to a preset ratio of oxygen to gas.

8. The multi-oxygen combustion heat radiation baking device according to claim 7, characterized in that: The gas control unit (6) also includes a first pressure transmitter, which is used to detect the gas pressure and is connected to the control system for communication. When the gas pressure exceeds a preset value, the control system controls the cutting off of the gas, oxygen and circulating flue gas supply.

9. The multi-oxygen combustion heat radiation baking device according to claim 7, characterized in that: The oxygen control unit (7) further comprises a second pressure transmitter, which is used to detect the oxygen pressure and is in communication connection with the control system. When the oxygen pressure exceeds a preset value, the control system controls to cut off the supply of fuel gas, oxygen and circulating flue gas.

10. The multi-oxygen combustion heat radiation baking device according to claim 7, characterized in that: The gas control unit (6) also includes a gas leakage alarm, which is used to detect gas leakage.

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