A highly reliable sulfuric acid production boiler

Abstract

The present invention discloses a highly reliable acid-making boiler, which relates to the technical field of acid-making boilers; specifically, it includes a furnace body. A flue exhaust duct is provided at the top of the furnace body, a slag receiving shell is provided at the bottom of the furnace body, and a hollowed-out frame is provided on the inner wall of the furnace body above the slag receiving shell. An air inlet duct and a door are respectively provided on both sides of the furnace body above the hollowed-out frame, and a water-cooled wall is provided on the inner wall of the top of the furnace body. On the one hand, by setting the fixing member as a combined fixing form of a fixing frame, a ferrule, and a bushing, on the basis of ensuring easy installation, disassembly, and stable fixing, the toughness of the bushing can be used to buffer the stress during the thermal expansion and contraction of the "U" tube. On the other hand, by providing a high-nickel alloy fusion welding coating on the outer wall of the evaporation tube, it can prevent acid erosion. At the same time, high-temperature resistant coatings are provided on the outer walls of the fixing frame and the ferrule to prevent thermal deformation. In addition, by providing an obtuse elbow, which is arranged at an obtuse angle, it can buffer the erosion of the heat exchange medium on the turning part and prevent tube explosion.

Description

Technical Field

[0001] The present invention relates to the technical field of acid-making boilers, and in particular to a highly reliable acid-making boiler. Background Art

[0002] The wet desulfurization process in the coking industry is to remove elemental paste sulfur and high-concentration desulfurized waste liquid from coke oven gas, and then use the incineration process to produce concentrated sulfuric acid. This not only solves the environmental protection problem of difficult treatment of desulfurized waste liquid, but also produces concentrated sulfuric acid products, bringing economic benefits to enterprises. It is a relatively advanced production process technology at present.

[0003] In the existing acid-making boilers, there are the following disadvantages:

[0004] 1. The water-cooled wall tubes in the boiler are all fixedly connected without allowance. When the tubes expand due to heat or contract due to cold, allowance compensation cannot be carried out, so that the stress after the tubes are deformed cannot be eliminated;

[0005] 2. Condensation may occur on the water-cooled wall in the boiler. Sulfuric acid will dissolve in the condensate to form a dilute sulfuric acid solution, and the dilute sulfuric acid solution will erode the tubes;

[0006] 3. The elbows of the water-cooled wall tubes adopt 90-degree elbows. When the heat exchange water flows through the elbows, the impact on the elbows is relatively large, and leakage is likely to occur at the elbows.

[0007] Therefore, the present invention proposes a highly reliable acid-making boiler. Summary of the Invention

[0008] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a highly reliable acid-making boiler.

[0009] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A highly reliable acid-making boiler, including a furnace body. An exhaust air duct is provided at the top of the furnace body, a slag receiving shell is provided at the bottom of the furnace body, and a hollowed-out rack is provided on the inner wall of the furnace body above the slag receiving shell. An air inlet duct and a door are respectively provided on both sides of the furnace body above the hollowed-out rack, and a water-cooled wall is provided on the inner wall of the top of the furnace body;

[0011] The water-cooled wall is composed of multiple groups of evaporation tubes fixed to the four inner walls of the furnace body through fixing parts. The tops of all the evaporation tubes are interconnected through a second manifold, and the bottoms of all the evaporation tubes are interconnected through a first manifold. A heat exchanger is connected between the first manifold and the second manifold, and a circulation pump is provided at the connection between the second manifold and the heat exchanger or at the connection between the first manifold and the heat exchanger;

[0012] The evaporation tube is composed of a plurality of "U" tubes connected by obtuse elbows;

[0013] Moreover, the outer walls of the "U" - shaped pipe and the obtuse - angle elbow are both sprayed with a high - nickel alloy fusion - welded coating;

[0014] The fixing member includes a fixing frame and a plurality of collars. The fixing frame is fixed to the inner wall of the furnace body, the collars are fixed to the other side of the fixing frame, and the "U" - shaped pipe is fixedly wrapped by a bushing between the inner walls of the fixing frame and the collars. The outer walls of the fixing frame and the collars are both sprayed with a high - temperature - resistant coating, and the bushing is made of ductile metal.

[0015] Preferably: Both sides of the hollowed - out frame are rotatably connected with sliders through connecting shafts. The sliders are longitudinally slidably connected to the inner wall of the furnace body. A gear is fixed to the outer wall of the connecting shaft, and a tooth profile meshing with the gear is arranged on one inner wall of the furnace body.

[0016] Further: An intake fan is fixed to the inner wall of the air inlet duct, and a turbine is arranged at the bottom of the air inlet duct at the downstream position of the intake fan. An eccentric rod is fixed to the outer wall of the output shaft of the turbine. The other end of the eccentric rod is rotatably connected to a first connecting rod. The other end of the first connecting rod is rotatably connected to a sliding rod slidably matched with the side wall of the furnace body. The other end of the sliding rod is rotatably connected to the bottom of the hollowed - out frame.

[0017] On the basis of the foregoing solution: A housing is fixed to the side wall of the furnace body. A magnetic core is insulated and fixed to the inner wall of the housing. A primary coil and two secondary coils are respectively wound around the outer wall of the magnetic core. A set of power control components is arranged at each position of the housing corresponding to the secondary coils.

[0018] In a better solution of the foregoing solution: The power control component includes a telescopic device fixed to the side wall of the housing and a guiding block fixed to the telescopic end of the telescopic device. An electrode head is fixed to the side wall of the guiding block. The electrode head is in contact with and electrically conducts with the secondary coil. The two ends of the primary coil are connected to an external AC power supply.

[0019] As a further solution of the present invention: One end of one of the secondary coils and the electrode head cooperating with this secondary coil are respectively connected to the wiring terminals of the circulation pump.

[0020] Meanwhile, one end of the other secondary coil and the electrode head cooperating with this secondary coil are respectively connected to the wiring terminals of the intake fan.

[0021] As a preferred solution of the present invention: The telescopic device for controlling the power change of the circulation pump is a pneumatic telescopic rod, and the telescopic device for controlling the power change of the intake fan is an electromagnetic telescopic rod.

[0022] Meanwhile, a heat - sensitive pipe is fixed to the inner wall of the exhaust duct. One end of the heat - sensitive pipe is blocked, the other end of the heat - sensitive pipe is connected to the pneumatic cavity of the pneumatic telescopic rod, and a thermal expansion medium is filled in the heat - sensitive pipe;

[0023] The thermal expansion medium is a mixed gas of nitrogen dioxide and dinitrogen tetroxide.

[0024] As a more preferable solution of the present invention: A light emitter is clamped to the inner wall on one side of the exhaust duct, and a lens and a photoelectric conversion plate are respectively fixed to the inner wall on the other side of the exhaust duct symmetric to the light emitter. The output end of the photoelectric conversion plate is connected to the electromagnet of the electromagnetic telescopic rod.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. In the present invention, on the one hand, by setting the fixing member as a combined fixing form of a fixing frame, a ferrule, and a bushing, on the basis of ensuring easy installation, disassembly, and stable fixing, the toughness of the bushing can be used to buffer the stress during the thermal expansion and contraction of the "U" tube. On the other hand, by setting a high-nickel alloy fusion welding coating on the outer wall of the evaporation tube, it can prevent acid erosion. At the same time, high-temperature resistant coatings are provided on the outer walls of the fixing frame and the ferrule to prevent thermal deformation. In addition, by setting an obtuse elbow, which is arranged at an obtuse angle, it can buffer the erosion of the heat exchange medium on the turning point and prevent pipe explosion.

[0027] 2. In the present invention, by setting the hollow frame as a movable type, which can rotate and swing left and right and vibrate up and down at the same time, the contact area between the incinerated object and the air blown in by the intake fan can be increased, enhancing the sufficiency of combustion. Moreover, the left and right rotation and swing and the up and down vibration of the hollow frame are linked by gears and teeth. The left and right rotation and swing of the hollow frame are realized through components such as a turbine and a connecting rod II, and the power source is the intake fan. Thus, the power layout is reduced, the linkage is increased, and at the same time, when the combustion is insufficient, the function of simultaneously controlling the intake air volume and the movement frequency of the hollow frame can be achieved only by controlling the power of the intake fan, simplifying the control logic.

[0028] 3. In the present invention, based on the characteristic that the number of turns is linearly related to the output in electromagnetic induction, the power of the circulating pump and the electrode head can be correspondingly controlled by the telescopic device, so as to not only ensure the heat exchange efficiency and ensure that the temperature of the gas at the outlet of the exhaust duct is appropriate, but also ensure sufficient combustion.

[0029] 4. In the present invention, by setting a heat-sensitive tube, the expansion and contraction of the pneumatic telescopic rod are controlled by the thermal expansion and contraction of the heat-sensitive tube, and then the circulating power of the circulating pump is controlled, so as to realize the function of negatively feedback regulating the circulating heat exchange power according to the temperature of the exhaust duct. At the same time, a mixed gas of nitrogen dioxide and dinitrogen tetroxide is set in the heat-sensitive tube. When the temperature changes, in addition to its own thermal expansion and contraction, a chemical equilibrium shift will also occur, thereby increasing the sensitivity of control.

[0030] 5. In the present invention, by providing components such as a photoelectric conversion board, a lens, and a light emitter, and using the principle that whether combustion is sufficient is related to the color of the gas generated by combustion, the sufficiency of combustion is judged based on the photosensitive intensity of the photoelectric conversion board. At the same time, the expansion and contraction of the electromagnetic telescopic rod are controlled according to the magnitude of the output voltage of the photoelectric conversion board, achieving the functions of negative feedback regulation of the intake air volume and the vibration amplitude of the hollowing frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. is a schematic diagram of the overall structure of a highly reliable sulfuric acid production boiler proposed by the present invention;

[0032] Figure 2 FIG. is a schematic diagram of the water wall structure of a highly reliable sulfuric acid production boiler proposed by the present invention;

[0033] Figure 3 FIG. is a schematic diagram of the evaporation tube structure of a highly reliable sulfuric acid production boiler proposed by the present invention;

[0034] Figure 4 FIG. is a schematic diagram of a partial structure of the fixing part of a highly reliable sulfuric acid production boiler proposed by the present invention;

[0035] Figure 5 FIG. is a schematic diagram of the connection structure between the furnace body and the hollowing frame of a highly reliable sulfuric acid production boiler proposed by the present invention;

[0036] Figure 6 FIG. is a schematic diagram of the driving part structure of the hollowing frame of a highly reliable sulfuric acid production boiler proposed by the present invention;

[0037] Figure 7 FIG. is a schematic diagram of the connection shaft and the intake fan power control part structure of a highly reliable sulfuric acid production boiler proposed by the present invention;

[0038] Figure 8 FIG. is a schematic cross-sectional view of the exhaust air duct of a highly reliable sulfuric acid production boiler proposed by the present invention.

[0039] In the figure: 1, furnace body; 2, air inlet duct; 3, slag receiving shell; 4, door; 5, water wall; 6, exhaust air duct; 7, hollowing frame; 8, fixing part; 9, circulation pump; 10, heat exchanger; 11, first collecting pipe; 12, second collecting pipe; 13, evaporation tube; 14, obtuse elbow; 15, "U" tube; 16, fixing frame; 17, ferrule; 18, bushing; 19, connecting shaft; 20, slider; 21, tooth; 22, gear; 23, intake fan; 24, turbine; 25, eccentric rod; 26, first connecting rod; 27, sliding rod; 28, second connecting rod; 29, housing; 30, magnetic core; 31, guiding block; 32, electrode head; 33, secondary coil; 34, power control component; 35, primary coil; 36, heat sensing tube; 37, photoelectric conversion board; 38, lens; 39, light emitter; 40, expander. Detailed implementation manners

[0040] The technical solution of the present invention will be further described in detail below in conjunction with the specific implementation manners.

[0041] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0042] Embodiment 1, a highly reliable acid-making boiler, as Figures 1-8 shown, includes a furnace body 1. A flue duct 6 is arranged at the top of the furnace body 1, a slag receiving shell 3 is arranged at the bottom of the furnace body 1, and a hollowed-out rack 7 is arranged on the inner wall of the furnace body 1 above the slag receiving shell 3. An air inlet duct 2 and a door 4 are respectively arranged on both sides of the furnace body 1 above the hollowed-out rack 7, and a water-cooled wall 5 is arranged on the inner wall of the top of the furnace body 1.

[0043] When in use, open the door 4, place the combustibles on the hollowed-out rack 7, then close the door 4 after ignition, and then blow air through the air inlet duct 2 to ensure the oxygen required for combustion. The waste gas generated by combustion is heat-exchanged and cooled through the water-cooled wall 5 and then discharged through the flue duct 6. Then, the waste gas can be processed subsequently to make acid. Since preparing sulfuric acid from sulfur oxides in the combustion waste gas belongs to the prior art process and no creative work has been done in this embodiment, it will not be elaborated here.

[0044] The water-cooled wall 5 is composed of multiple evaporation tubes 13 fixed to the four inner walls of the furnace body 1 through fixing members 8. The tops of all the evaporation tubes 13 are interconnected through a second manifold 12, and the bottoms of all the evaporation tubes 13 are interconnected through a first manifold 11. A heat exchanger 10 is connected between the first manifold 11 and the second manifold 12, and a circulation pump 9 is arranged at the connection between the second manifold 12 and the heat exchanger 10 or at the connection between the first manifold 11 and the heat exchanger 10.

[0045] In this embodiment, no specific type of the heat exchanger 10 is limited. It can adopt a plate fin heat exchanger, which dissipates heat into the air and cannot form energy recovery. At the same time, it can also adopt a double-flow shell-and-tube heat exchanger, which uses the heat exchange of two flow channels to exchange the heat of the heat exchange medium in the first manifold 11, the second manifold 12, and the evaporation tubes 13 to another flow channel. The heat exchange medium in the other flow channel can be water, etc., and the heat recovery is realized by heating the water.

[0046] The evaporation tube 13 is composed of multiple "U" tubes 15 connected through obtuse elbows 14. In this embodiment, the turning angle of the obtuse elbow 14 is preferably 135 degrees.

[0047] Both the outer walls of the "U" - shaped pipe 15 and the obtuse - angled elbow 14 are sprayed with a high - nickel alloy fusion - welded coating.

[0048] The fixing member 8 includes a fixing frame 16 and a plurality of collars 17. The fixing frame 16 is fixed to the inner wall of the furnace body 1, and the collars 17 are fixed to the other side of the fixing frame 16. The inner walls of the fixing frame 16 and the collars 17 are wrapped and fixed with the "U" - shaped pipe 15 through a bushing 18. The outer walls of the fixing frame 16 and the collars 17 are both sprayed with a high - temperature - resistant coating, and the bushing 18 is made of ductile metal.

[0049] In this device, on the one hand, by setting the fixing member 8 as a combined fixing form of a fixing frame 16, collars 17, and a bushing 18, on the basis of ensuring easy installation, disassembly, and stable fixing, the ductility of the bushing 18 can be used to buffer the stress during the thermal expansion and contraction of the "U" - shaped pipe 15. On the other hand, by setting a high - nickel alloy fusion - welded coating on the outer wall of the evaporation pipe 13, it can prevent acid erosion. At the same time, high - temperature - resistant coatings are provided on the outer walls of the fixing frame 16 and the collars 17 to prevent thermal deformation. In addition, by setting the obtuse - angled elbow 14, which is arranged at an obtuse angle, it can buffer the erosion of the heat - exchange medium on the turning part and prevent pipe explosion.

[0050] To solve the problem of combustion sufficiency, as Figure 5 shown, both sides of the hollow frame 7 are rotatably connected to sliders 20 through connecting shafts 19. The sliders 20 are longitudinally slidably connected to the inner wall of the furnace body 1. A gear 22 is fixed to the outer wall of the connecting shaft 19, and a tooth 21 meshing with the gear 22 is provided on one side inner wall of the furnace body 1.

[0051] An air inlet fan 23 is fixed to the inner wall of the air inlet duct 2. A turbine 24 is provided at the bottom of the air inlet duct 2 at the downstream position of the air inlet fan 23. An eccentric rod 25 is fixed to the outer wall of the output shaft of the turbine 24. The other end of the eccentric rod 25 is rotatably connected to a first connecting rod 26. The other end of the first connecting rod 26 is rotatably connected to a sliding rod 27 slidably fitted to the side wall of the furnace body 1. The other end of the sliding rod 27 is rotatably connected to a second connecting rod 28. The other end of the second connecting rod 28 is rotatably connected to the bottom of the hollow frame 7.

[0052] When the air inlet fan 23 is started, it can blow air into the furnace body 1, thus inputting oxygen. At the same time, the turbine 24 will rotate the output shaft due to air flow, thereby driving the eccentric rod 25 to rotate. The rotation of the eccentric rod 25 can drive the sliding rod 27 to reciprocate through the first connecting rod 26, and then drive the hollow frame 7 to reciprocally rotate through the second connecting rod 28. When the hollow frame 7 reciprocally rotates, it drives the gear 22 to reciprocally rotate through the connecting shaft 19, and then drives the slider 20 to reciprocally move up and down through the gear 22 and the tooth 21, thereby driving the hollow frame 7 to reciprocally vibrate up and down.

[0053] During the actual incineration process, the combustion sufficiency of the incinerated material depends on the oxygen concentration and the contact area between oxygen and the incinerated material. In this device, by setting the hollow frame 7 as movable, which can rotate and swing left and right and vibrate up and down at the same time, the contact area between the incinerated material and the air blown in by the intake fan 23 can be made larger, increasing the combustion sufficiency. Moreover, the left-right rotation and swing and the up-down vibration of the hollow frame 7 are linked through the gear 22 and the tooth 21. The left-right rotation and swing of the hollow frame 7 are realized through components such as the turbine 24 and the connecting rod two 28. The power source is the intake fan 23. Thus, the power layout is reduced, the linkage is increased, and at the same time, when the combustion is insufficient, the function of controlling the intake air volume and the movement frequency of the hollow frame 7 can be achieved only by controlling the power of the intake fan 23, simplifying the control logic.

[0054] To solve the power control problem, as Figure 7 shown, a housing 29 is fixed to the side wall of the furnace body 1. A magnetic core 30 is insulatingly fixed to the inner wall of the housing 29. A primary coil 35 and two secondary coils 33 are respectively wound around the outer wall of the magnetic core 30. A set of power control components 34 is provided at each position of the housing 29 where the secondary coil 33 is located.

[0055] The power control component 34 includes a telescopic device 40 fixed to the side wall of the housing 29 and a guide block 31 fixed to the telescopic end of the telescopic device 40. An electrode head 32 is fixed to the side wall of the guide block 31. The electrode head 32 is in contact with and electrically conducts with the secondary coil 33.

[0056] One end of one of the secondary coils 33 and the electrode head 32 cooperating with this secondary coil 33 are respectively connected to the connection terminals of the circulation pump 9; one end of the other secondary coil 33 and the electrode head 32 cooperating with this secondary coil 33 are respectively connected to the connection terminals of the intake fan 23. Both ends of the primary coil 35 are connected to an external AC power supply.

[0057] When an AC voltage is applied to the primary coil 35, an alternating frequency magnetic field will appear in the magnetic core 30, so that an induced voltage is generated in the secondary coil 33. The induced voltages of the two secondary coils 33 supply power to the circulation pump 9 and the intake fan 23 respectively. And when the input of the primary coil 35 remains unchanged, the movement of the electrode head 32 will cause the number of turns of the secondary coil 33 connected to be changed, so that the number of turns of the output of the secondary coil 33 is changed. Specifically, the logic of the circulation pump 9 and the intake fan 23 is as follows:

[0058] When the temperature at the outlet of the exhaust air duct 6 is on the high side, it indicates that the heat exchange efficiency of the evaporation pipe 13 is relatively low. At this time, the electrode head 32 can be moved through the expander 40 to increase the number of turns of the secondary coil 33 connected to the circulation pump 9, so that the input power of the circulation pump 9 increases, and the circulation rate of the heat exchange medium in the first manifold 11, the second manifold 12, the evaporation pipe 13, and the heat exchanger 10 speeds up, increasing the heat exchange efficiency, and vice versa.

[0059] When incomplete combustion occurs, the electrode head 32 can be moved through another expander 40 at this time to increase the number of turns of the secondary coil 33 connected to the intake fan 23, so that the power of the intake fan 23 increases, the intake air volume increases and the vibration frequency of the hollow frame 7 increases, so as to increase the combustion efficiency, and vice versa.

[0060] With this device, based on the characteristic that the number of turns is linearly related to the output based on electromagnetic induction, the expander 40 can be used to correspondingly control the power of the circulation pump 9 and the electrode head 32, so as to not only ensure the heat exchange efficiency and ensure that the temperature of the gas at the outlet of the exhaust air duct 6 is appropriate, but also ensure complete combustion.

[0061] When this embodiment is in use, on the one hand, by setting the fixing member 8 as a combined fixing form of a fixing frame 16, a ferrule 17, and a bushing 18, it can not only ensure easy installation, disassembly, and stable fixing, but also utilize the toughness of the bushing 18 to buffer the stress during the thermal expansion and contraction of the "U" tube 15. On the other hand, by setting a high-nickel alloy fusion welding coating on the outer wall of the evaporation tube 13, it can prevent acid erosion. At the same time, high-temperature resistant coatings are provided on the outer walls of the fixing frame 16 and the ferrule 17 to prevent thermal deformation. In addition, by setting an obtuse elbow 14, which is arranged at an obtuse angle, it can buffer the erosion of the heat exchange medium on the turning point and prevent tube explosion. When the intake fan 23 starts, it can blow air into the furnace body 1 to input oxygen. At the same time, the turbine 24 will cause the output shaft to rotate due to air flow, thereby driving the eccentric rod 25 to rotate. The rotation of the eccentric rod 25 can drive the slide rod 27 to reciprocate through the first connecting rod 26, and then drive the hollow frame 7 to rotate reciprocally through the second connecting rod 28. When the hollow frame 7 rotates reciprocally, it drives the gear 22 to rotate reciprocally through the connecting shaft 19, and then drives the slider 20 to reciprocate up and down through the gear 22 and the teeth 21, thereby driving the hollow frame 7 to vibrate up and down reciprocally. And when an alternating voltage is applied to the primary coil 35, an alternating frequency magnetic field will appear in the magnetic core 30, thereby generating an induced voltage in the secondary coil 33. The induced voltages of the two secondary coils 33 supply power to the circulation pump 9 and the intake fan 23 respectively. And when the input of the primary coil 35 remains unchanged, the movement of the electrode head 32 will cause the number of turns of the secondary coil 33 connected to change, thereby changing the number of output turns of the secondary coil 33. Specifically, the logic of the circulation pump 9 and the intake fan 23 is as follows: When the temperature at the outlet of the exhaust duct 6 is on the high side, it means that the heat exchange efficiency of the evaporation tube 13 is relatively low. At this time, the electrode head 32 can be moved through the expander 40 to increase the number of turns of the secondary coil 33 connected to the circulation pump 9, thereby increasing the input power of the circulation pump 9. The circulation rate of the heat exchange medium in the first manifold 11, the second manifold 12, the evaporation tube 13, and the heat exchanger 10 is accelerated, increasing the heat exchange efficiency, and vice versa. When the combustion is insufficient, at this time, the electrode head 32 can be moved through another expander 40 to increase the number of turns of the secondary coil 33 connected to the intake fan 23, thereby increasing the power of the intake fan 23, increasing the intake air volume and at the same time increasing the vibration frequency of the hollow frame 7 to increase the combustion efficiency, and vice versa.

[0062] Embodiment 2, a highly reliable sulfuric acid boiler, as Figures 1-8 shown, to solve the problem of adaptive negative feedback power control; the following improvements are made on the basis of Embodiment 1 in this embodiment: The expander 40 that controls the power change of the circulation pump 9 is a pneumatic telescopic rod, and the expander 40 that controls the power change of the intake fan 23 is an electromagnetic telescopic rod.

[0063] The inner wall of the exhaust air duct 6 is fixedly provided with a heat-sensitive pipe 36. One end of the heat-sensitive pipe 36 is blocked, and the other end of the heat-sensitive pipe 36 is connected to the pneumatic cavity of the pneumatic telescopic rod. Moreover, a thermal expansion medium is filled inside the heat-sensitive pipe 36.

[0064] The thermal expansion medium is a mixed gas of nitrogen dioxide and dinitrogen tetroxide.

[0065] On one inner wall of the exhaust air duct 6, a light emitter 39 is clamped. On the other inner wall of the exhaust air duct 6 symmetrical to the light emitter 39, a lens 38 and a photoelectric conversion plate 37 are respectively fixed. The output end of the photoelectric conversion plate 37 is connected to the electromagnet of the electromagnetic telescopic rod.

[0066] When in use in this embodiment, when the temperature of the gas at the outlet of the exhaust air duct 6 is on the high side, the thermal expansion medium will expand relatively when heated, so that the pressure in the pneumatic cavity of the expander 40 increases, causing the telescopic end of the expander 40 to move, increasing the number of turns of the secondary coil 33 of the control circulation pump 9 connected, and vice versa. When the combustion is insufficient, the gas generated by the combustion will be doped with particles to become "black smoke", thus blocking the light emitted by the light emitter 39, reducing the light intensity received by the photoelectric conversion plate 37, and reducing the voltage at the output end of the photoelectric conversion plate 37. As a result, the telescopic end of the expander 40 of the electromagnetic telescopic rod moves, increasing the number of turns of the secondary coil 33 of the control intake fan 23 connected, and vice versa.

[0067] In this device, by arranging the heat-sensitive pipe 36, using the thermal expansion and contraction of the heat-sensitive pipe 36 to control the expansion and contraction of the pneumatic telescopic rod and then control the circulation power of the circulation pump 9, the function of negative feedback regulating the circulation heat exchange power according to the temperature of the exhaust air duct 6 can be realized. At the same time, a mixed gas of nitrogen dioxide and dinitrogen tetroxide is arranged inside the heat-sensitive pipe 36. When the temperature changes, in addition to its own thermal expansion and contraction, a chemical equilibrium shift will also occur, thereby increasing the sensitivity of the control.

[0068] In this device, by arranging components such as the photoelectric conversion plate 37, the lens 38, and the light emitter 39, using the principle that whether the combustion is sufficient is related to the color of the gas generated by the combustion, the photoelectric conversion plate 37 is used to judge whether the combustion is sufficient according to the photosensitive intensity, and at the same time, the expansion and contraction of the electromagnetic telescopic rod are controlled according to the magnitude of the output voltage of the photoelectric conversion plate 37, achieving the function of negative feedback regulating the intake air volume and the vibration amplitude of the hollow frame 7.

[0069] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A highly reliable sulfuric acid boiler, characterized in that, It includes a furnace body (1). An exhaust air duct (6) is provided at the top of the furnace body (1). A slag receiving shell (3) is provided at the bottom of the furnace body (1). A hollowed-out rack (7) is provided on the inner wall of the furnace body (1) above the slag receiving shell (3). An air inlet duct (2) and a door (4) are respectively provided on both sides of the furnace body (1) above the hollowed-out rack (7). A water-cooled wall (5) is provided on the inner wall of the top of the furnace body (1); The water-cooled wall (5) is composed of multiple evaporation tubes (13) fixed to the inner walls at four places of the furnace body (1) through fixing parts (8). The tops of all the evaporation tubes (13) are interconnected through a second manifold pipe (12). The bottoms of all the evaporation tubes (13) are interconnected through a first manifold pipe (11). A heat exchanger (10) is connected between the first manifold pipe (11) and the second manifold pipe (12). A circulation pump (9) is provided at the connection between the second manifold pipe (12) and the heat exchanger (10) or at the connection between the first manifold pipe (11) and the heat exchanger (10); The evaporation tube (13) is composed of multiple "U" tubes (15) connected through obtuse elbows (14); And high-nickel alloy fusion welding coatings are sprayed on the outer walls of the "U" tubes (15) and the obtuse elbows (14); The fixing part (8) includes a fixing frame (16) and multiple hoop collars (17). The fixing frame (16) is fixed to the inner wall of the furnace body (1). The hoop collars (17) are fixed to the other side of the fixing frame (16). The "U" tube (15) is fixedly wrapped between the inner walls of the fixing frame (16) and the hoop collars (17) through a bushing (18). High-temperature resistant coatings are sprayed on the outer walls of the fixing frame (16) and the hoop collars (17). The bushing (18) is made of ductile metal; Sliders (20) are rotatably connected to both sides of the hollowed-out rack (7) through connecting shafts (19). The sliders (20) are longitudinally slidably connected to the inner wall of the furnace body (1). A gear (22) is fixed to the outer wall of the connecting shaft (19). Teeth (21) meshing with the gear (22) are provided on one side inner wall of the furnace body (1); An air intake fan (23) is fixed to the inner wall of the air inlet duct (2). A turbine (24) is provided at the bottom of the air inlet duct (2) at the downstream position of the air intake fan (23). An eccentric rod (25) is fixed to the outer wall of the output shaft of the turbine (24). The other end of the eccentric rod (25) is rotatably connected to a first connecting rod (26). The other end of the first connecting rod (26) is rotatably connected to a sliding rod (27) slidably fitted to the side wall of the furnace body (1). The other end of the sliding rod (27) is rotatably connected to a second connecting rod (28). The other end of the second connecting rod (28) is rotatably connected to the bottom of the hollowed-out rack (7); A shell (29) is fixed to the side wall of the furnace body (1). A magnetic core (30) is insulated and fixed to the inner wall of the shell (29). A primary coil (35) and two secondary coils (33) are respectively wound around the outer wall of the magnetic core (30). A set of power control components (34) is provided at each position of the shell (29) where the secondary coil (33) is located; The power control component (34) includes a telescopic device (40) fixed to the side wall of the housing (29) and a guide block (31) fixed to the telescopic end of the telescopic device (40). An electrode head (32) is fixed to the side wall of the guide block (31). The electrode head (32) is in contact with and electrically connected to the secondary coil (33). Both ends of the primary coil (35) are connected to an external AC power supply; The telescopic device (40) for controlling the power change of the circulation pump (9) is a pneumatic telescopic rod, and the telescopic device (40) for controlling the power change of the intake fan (23) is an electromagnetic telescopic rod; A light emitter (39) is clamped to the inner wall on one side of the exhaust duct (6). A lens (38) and a photoelectric conversion board (37) are respectively fixed to the inner wall on the other side of the exhaust duct (6) symmetric to the light emitter (39). The output end of the photoelectric conversion board (37) is connected to the electromagnet of the electromagnetic telescopic rod.

2. The highly reliable acid-making boiler according to claim 1, characterized in that, One end of one of the secondary coils (33) and the electrode head (32) cooperating with the secondary coil (33) are respectively connected to the wiring terminals of the circulation pump (9).

3. A highly reliable acid-making boiler according to claim 1, characterized in that, One end of the other secondary coil (33) and the electrode head (32) cooperating with the secondary coil (33) are respectively connected to the wiring terminals of the intake fan (23).

4. A highly reliable acid-making boiler according to claim 1, characterized in that, A heat-sensitive pipe (36) is fixed to the inner wall of the exhaust duct (6). One end of the heat-sensitive pipe (36) is blocked. The other end of the heat-sensitive pipe (36) is connected to the pneumatic chamber of the pneumatic telescopic rod, and a thermal expansion medium is filled in the heat-sensitive pipe (36); The thermal expansion medium is a mixed gas of nitrogen dioxide and dinitrogen tetroxide.

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