Sulfur burning furnace device with double material inlets

Abstract

The invention discloses a sulfur burning furnace device with double material inlets. The sulfur burning furnace device comprises a sulfur burning furnace body with double material inlets, an air preheater, a sulfur crushing device and a sulfur melting kettle device, a flue gas outlet is formed in the middle of the double-material-inlet sulfur burning furnace body, a left liquid sulfur inlet and a right liquid sulfur inlet are formed in the two ends of the double-material-inlet sulfur burning furnace body respectively, and a primary air inlet set, an upper baffling retaining wall, a secondary air inlet set and a lower baffling retaining wall are sequentially and symmetrically arranged between the left liquid sulfur inlet and the flue gas outlet and between the right liquid sulfur inlet and the flue gas outlet. The air preheater is used for exchanging heat between high-temperature flue gas generated by the furnace body of the double-material-inlet sulfur burning furnace and normal-temperature air, and the sulfur melting kettle device melts solid sulfur powder into liquid sulfur by utilizing heat of medium-temperature flue gas; the sulfur crushing device is used for crushing solid sulfur into solid sulfur powder and conveying the solid sulfur powder to the sulfur powder feeding port. The device has the advantages of being high in combustion efficiency, good in heat transfer effect, compact in structure, high in productivity and the like, and flue gas waste heat cascade recovery is achieved.

Description

Technical Field

[0001] This invention belongs to the field of sulfur incineration furnace technology and relates to a dual-material inlet sulfur incineration furnace device. Background Technology

[0002] Sulfuric acid is one of the most important chemical products in the world today. It serves not only as a raw material for many chemical products but also has wide applications in other sectors of the national economy. There are three main methods for industrially producing sulfuric acid: sulfur production from sulfur, sulfur production from pyrite, and sulfur production from the recovery of flue gas from non-ferrous metal smelting. These three raw materials account for 98% of industrial sulfuric acid production, with sulfur production accounting for 44%, followed by smelting at 36.2%. Pyrite production, due to its complex process, long production time, and low heat recovery rate, has seen its share in my country's industrial sulfuric acid production gradually decline, reaching only 17.8%. Therefore, sulfur production is the primary source of sulfur in the industry and has many advantages. However, some equipment or methods in the sulfur production process have shortcomings, including the following:

[0003] (1) Most common sulfuric acid production equipment in industry currently has a single sulfur inlet and a single flue gas outlet, resulting in combustion dead zones and incomplete combustion, which leads to persistent combustion efficiency problems with little improvement. (2) When sulfur is burned in a sulfur incinerator, a large amount of flue gas is generated. The flue gas contains high heat. In the existing technology, the heat in the sulfur incineration flue gas is usually treated by spray cooling, etc. During the cooling process, the heat is lost for no reason, which is not conducive to energy conservation and environmental protection requirements and needs to be improved. (3) Crude sulfur contains inorganic salts, organic matter, moisture, ash, impurities and heavy metal elements. The presence of these impurities may affect the purity and quality of crude sulfur, thereby further affecting the effect of sulfuric acid production. (4) Sulfur combustion needs to be maintained in a reasonable temperature range to ensure the lowest energy consumption, reduce impurity generation and equipment safety. The temperature monitoring of existing equipment has some shortcomings and cannot accurately monitor the combustion temperature and flue gas temperature. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a dual-material inlet sulfur incinerator device.

[0005] Technical solution: The present invention provides a dual-material inlet sulfur incinerator, comprising a dual-material inlet sulfur incinerator body, an air preheater, a sulfur crushing device, and a sulfur melting kettle;

[0006] The dual-material inlet sulfur incinerator has a flue gas outlet in the middle of its furnace body. A left liquid sulfur inlet and a right liquid sulfur inlet are respectively located at both ends of the furnace body. A primary air inlet group, an upper baffle wall, a secondary air inlet group, and a lower baffle wall are symmetrically arranged between the left and right liquid sulfur inlets and the flue gas outlet. The primary air inlet group is used to introduce primary air at 270-300℃, and the secondary air inlet group is used to introduce ambient temperature air.

[0007] The air preheater includes a high-temperature flue gas inlet and a high-temperature flue gas outlet, a normal-temperature air inlet and a primary air outlet. The high-temperature flue gas inlet is connected to the flue gas outlet, and the primary air outlet is connected to the primary air inlet assembly. The air preheater is used to exchange heat between the high-temperature flue gas generated by the dual-material inlet sulfur incinerator and the normal-temperature air, thereby reducing the temperature of the high-temperature flue gas (550-750℃) to form medium-temperature flue gas (400-500℃) and increasing the temperature of the normal-temperature air to form primary air (270-300℃).

[0008] The sulfur melting kettle device includes a medium-temperature flue gas inlet, a sulfur powder feed inlet, and a liquid sulfur discharge outlet. The medium-temperature flue gas inlet is connected to the high-temperature flue gas outlet, and the liquid sulfur discharge outlet is connected to the left and right liquid sulfur inlets. The sulfur melting kettle device uses the heat of the medium-temperature flue gas to melt solid sulfur powder into liquid sulfur.

[0009] The sulfur crushing device is used to crush solid sulfur into solid sulfur powder and convey it to the sulfur powder feed inlet.

[0010] Furthermore, an insulated settling box and a refined sulfur tank are provided between the liquid sulfur outlet and the liquid sulfur inlet. The insulated settling box is used to keep the liquid sulfur in a molten state and allow impurities to be discharged through natural sedimentation. Liquid sulfur with higher purity is then transported to the refined sulfur tank for storage.

[0011] Furthermore, the primary air inlet group includes several primary air inlets evenly distributed around the furnace body. The liquid sulfur inlet forms an angle of 12-17° with the primary air inlet. At this angle, the encounter time and mixing degree of the primary air and liquid sulfur are better, achieving a better combustion state.

[0012] Furthermore, a first thermocouple assembly is provided on the furnace wall where the angle between the liquid sulfur inlet and the primary air inlet intersects, and a second thermocouple is provided on the furnace wall near the flue gas outlet.

[0013] Furthermore, the first thermocouple group consists of four thermocouples, which are respectively located at the top, bottom, left, and right sides of the furnace body; the second thermocouple consists of one thermocouple, which is located on the upper wall of the furnace body.

[0014] Furthermore, the height of the upper and lower baffle walls is 3 / 4 of the furnace body diameter.

[0015] Furthermore, a liquid sulfur spray gun is provided at the liquid sulfur inlet.

[0016] Furthermore, induced draft fans are installed between the flue gas outlet and the high-temperature flue gas inlet, at the ambient air inlet, and between the high-temperature flue gas outlet and the medium-temperature flue gas inlet.

[0017] Furthermore, both the air preheater and the sulfur melting kettle are filled with sodium chloride thermally conductive salt as a thermally conductive medium, with a particle diameter of 2-5 mm and a bulk density of 0.8-1.2 g / cm³. 3 .

[0018] Furthermore, the sulfur melting kettle is equipped with a stirrer inside.

[0019] Beneficial Effects: Compared with the prior art, the present invention has the following significant advantages: 1. The dual-inlet sulfur incinerator of the present invention has the following advantages: First, it can ensure a stable supply of liquid sulfur, enabling the liquid sulfur to burn fully in the incinerator and improving combustion efficiency; Second, it enhances heat transfer: The combination and relative position structure of the upper and lower baffle walls and the secondary air inlet group inside the sulfur incinerator can strengthen the mixing of air and liquid sulfur atomized particles, further promoting the combustion and heat transfer process. Third, the dual-inlet structure of the present invention is compact, occupies a small area, and is convenient for layout and use in factories and other places. Fourth, the dual-inlet structure improves the problem of combustion dead zones and uneven heating in the sulfur incinerator. The two air inlets (symmetrically arranged) can introduce airflow from different directions. This significantly expands the effective coverage range of the airflow, allowing more areas, especially corners and edges that are difficult to cover with a single inlet, to obtain a relatively sufficient air supply and flow disturbance, greatly reducing the blank areas in the airflow distribution. As a result, the combustion efficiency of the dual-inlet sulfur incinerator is more than 20% higher than that of the traditional single-inlet sulfur incinerator under the same operating conditions. Furthermore, the dual liquid sulfur inlet design can process more liquid sulfur simultaneously, thus increasing the capacity of the sulfur incinerator and meeting the needs of large-scale production.

[0020] 2. Molten liquid sulfur flows into an insulated settling tank for stratified sedimentation, with impurities discharged from the bottom. Refined sulfur is then piped to the dual-spray guns of the sulfur incinerator. The liquid sulfur and preheated primary air are thoroughly mixed and combusted in the turbulent flow formed by the baffle wall. Precise temperature control of the secondary air maintains the flue gas outlet temperature at 550-750℃. Thermocouples installed in the upper, lower, left, and right sides of the combustion zone monitor the temperature in real time and automatically adjust the sulfur and air flow rates to ensure combustion efficiency. This method significantly improves combustion efficiency by more than 20%, achieves cascaded recovery of flue gas waste heat (preheated combustion air + molten sulfur heating), and simultaneously increases the specific surface area of ​​sulfur through crushing and separates impurities through settling, ensuring sulfur purity and system stability.

[0021] 3. The sulfur crushing device crushes solid sulfur into solid sulfur powder, which can significantly reduce the volume of the solid, making it easier for subsequent storage, transportation and melting. Crushing also increases the specific surface area of ​​the solid, making the melting process faster and more efficient. The crushed solid sulfur powder is more uniform, which helps to obtain more consistent melting products.

[0022] 4. The sulfur melting kettle is equipped with a central stirring rod, which is continuously rotated and stirred by a motor, so that the heat is quickly and evenly absorbed by the solid sulfur and melted into a liquid state, which greatly improves the melting efficiency. Attached Figure Description

[0023] Figure 1 This is a complete system diagram of the present invention.

[0024] Figure 2 This is a schematic diagram of the sulfur incineration furnace structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the air preheater structure of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the heat-insulated settling box and the refined sulfur tank of the present invention.

[0027] Figure 5 This is a schematic diagram of the sulfur melting kettle structure of the present invention.

[0028] Figure 6 This is a schematic diagram of the transmission device of the present invention.

[0029] Figure 7 This is a schematic diagram of the sulfur crusher device of the present invention.

[0030] Figure 8 This is a cross-sectional view showing the thermocouple installation positions at the combustion temperature and flue gas temperature of the present invention.

[0031] Drawing number explanation: 1. Left liquid sulfur spray gun; 2. Right liquid sulfur spray gun; 3. Left primary air inlet group; 4. Right primary air inlet group; 5. Left first thermocouple group; 6. Right third thermocouple group; 7. Left upper baffle wall; 8. Left lower baffle wall; 9. Right upper baffle wall; 10. Right lower baffle wall; 11. Left second thermocouple group; 12. Right fourth thermocouple group; 13. Left secondary air inlet group; 14. Right secondary air inlet group. Group 15, Fixed base group; 16, Flue gas outlet; 17, High-temperature flue gas outlet pipe; 18, No. 1 induced draft fan; 19, High-temperature flue gas inlet pipe; 20, Insulated wall; 21, High-temperature flue gas outlet pipe; 22, No. 2 induced draft fan; 23, Medium-temperature flue gas inlet pipe; 24, Medium-temperature flue gas outlet pipe; 25, Outer protective cover; 26, Inner wall of sulfur melting kettle; 27, Rotary motor; 28, Sulfur powder feed inlet; 29, Stirring rod; 30, ... 31. Fixed frame; 32. Electric motor; 33. Rotor; 34. Hammer blades; 35. Protective cover; 36. Drive belt; 37. Feed hopper; 38. Valve; 39. Liquid sulfur discharge pipe; 40. Insulated wall; 41. Impurity discharge pipe; 42. Refined sulfur discharge pipe; 43. Insulated wall; 44. No. 1 switch valve; 45. No. 2 switch valve; 46. No. 3 induced draft fan; 47. Dual-inlet sulfur incinerator body; 48. Air preheater; 49. Ambient temperature air inlet pipe; 50. Primary air preparation pipe; 51. Internal heat exchange pipe; 52. Internal rotary pipe; 53. Sulfur melting kettle device; 54. Sulfur crushing device; 55. Discharge port; 56. Gate; 57. Insulated settling box; 58. Fixed base; 59. Conveying device; 60. Conveyor belt; 61. Upper support roller group; 62. Lower support roller group; 63. Frame; 64. Tensioning device; 65. Drive roller; 66. Metering pump. Detailed Implementation

[0032] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0033] like Figure 1 As shown, this embodiment of a novel dual-inlet sulfur incinerator includes a dual-inlet sulfur incinerator body 46, flue gas duct, air preheater 47, sulfur crushing device 53, sulfur melting kettle device 52, heat preservation box 56, refined sulfur tank, induced draft fan 22 and other devices.

[0034] like Figure 2As shown, in this embodiment, the dual-material inlet sulfur incinerator body 46 mainly consists of a left-end liquid sulfur spray gun 1, a left-end primary air inlet group 3, a left-end first thermocouple group 5, a left-end second thermocouple group 11, a left-end upper baffle wall 7, a left-end lower baffle wall 8, a left-end secondary air inlet group 13, a right-end liquid sulfur spray gun 2, a right-end primary air inlet group 4, a right-end third thermocouple group 6, a right-end fourth thermocouple group 12, a right-end upper baffle wall 9, a right-end lower baffle wall 10, a right-end secondary air inlet group 14, a fixed base 15, and a flue gas outlet 16. It includes two liquid sulfur inlets on the left and right sides, eight primary air inlets, four baffle walls, sixteen secondary air inlets, and one flue gas outlet. High-temperature air enters the sulfur incinerator through eight primary air inlets, with the primary air temperature around 270℃. After the air completely fills the furnace, liquid sulfur fuel is injected into the furnace through sulfur injection guns at both ends. The liquid sulfur vaporizes upon contact with the high-temperature primary air, turning into gaseous sulfur, which then rapidly reacts with the air for combustion. The mixture of high-temperature air and gaseous sulfur creates turbulent flow within the furnace after passing through internal baffle walls, resulting in more uniform mixing and more complete sulfur combustion. The left secondary air inlet group 13 consists of eight inlets located between the left upper baffle wall 7 and the left lower baffle wall 8, evenly distributed around the furnace. The right secondary air inlet group 14 is configured similarly. At room temperature air enters the dual-material inlet sulfur incinerator furnace body 46 through the secondary air inlet group. The flue gas generated during combustion is cooled to within 550-750℃ by the secondary air and then discharged through the flue gas outlet 16 at the upper middle part of the dual-material inlet sulfur incinerator furnace body 46. The height of each of the four baffle walls (including the upper baffle wall 7 on the left, the lower baffle wall 8 on the left, the upper baffle wall 9 on the right, and the lower baffle wall 10 on the right) is 3 / 4 of the furnace body diameter.

[0035] The dual-material inlet sulfur incinerator body 46 of this embodiment has the following advantages: First, the dual liquid sulfur inlet design ensures a stable supply of liquid sulfur, enabling it to burn fully within the incinerator and improving combustion efficiency. Second, the relative positions of the internal baffle walls and secondary air inlets enhance the mixing of air and liquid sulfur atomized particles, further promoting combustion and heat transfer. Third, the compact dual-inlet structure design occupies a small area, facilitating its placement and use in factories and other locations. Fourth, under the same operating conditions, this dual-material inlet sulfur incinerator improves the problems of combustion dead zones and uneven heating within the incinerator, increasing combustion efficiency by more than 20% compared to traditional single-inlet sulfur incinerators. Furthermore, the dual liquid sulfur inlet design can process more liquid sulfur simultaneously, thus increasing the incinerator's capacity and meeting the needs of large-scale production.

[0036] like Figure 3As shown, in this embodiment, the air preheater 47 mainly consists of an insulated wall 20, a high-temperature flue gas inlet pipe 19, a high-temperature flue gas outlet pipe 21, a normal temperature air inlet pipe 48, a primary air preparation pipe 49, an internal heat exchange pipe 50, and an induced draft fan 45. One end of the high-temperature flue gas outlet pipe 17 is connected to the flue gas outlet 16 of the sulfur incinerator, and the other end is connected to the inlet of the No. 1 induced draft fan 18. The outlet of the No. 1 induced draft fan 18 is connected to the hot end inlet of the air preheater 47 through the high-temperature flue gas inlet pipe 19. The high-temperature flue gas (around 650°C) is drawn out of the sulfur incinerator and sent to the air preheater 47 by the rotation of the No. 1 induced draft fan 18. The high-temperature flue gas enters from the lower right, spirals upward inside, and then flows out from the upper left. After the high-temperature flue gas flows out of the air preheater 47, the medium-temperature flue gas with a temperature of around 450°C, that is, the high-temperature flue gas becomes medium-temperature flue gas after passing through the internal heat exchange pipe 50, and then flows out from the high-temperature flue gas outlet pipe 21. The medium-temperature flue gas is then driven by the No. 2 induced draft fan 22 and guided to the sulfur melting kettle device 52. Natural air enters from the upper left, spirals to the right inside, and flows out from the lower right outlet. That is, ambient temperature air flows in from the ambient temperature air inlet pipe 48 and is heated to the temperature required for primary air (about 250°C) in the air preheater 47 before being sent into the primary air inlet group (including the left primary air inlet group 3 and the right primary air inlet group 4) from the primary air preparation pipe 49.

[0037] The air preheater 47 is filled with finely granulated sodium chloride thermally conductive salt. High-temperature flue gas transfers heat to the internal sodium chloride thermally conductive salt medium. After the sodium chloride thermally conductive salt is heated, it transfers the heat to the primary air through the primary air preparation duct 49, raising the primary air temperature from atmospheric temperature to approximately 250°C, the temperature required by the sulfur incinerator. After the high-temperature flue gas exits through the air heat exchanger 47, its temperature is approximately 450°C; this is referred to as medium-temperature flue gas. Because the two ducts are arranged in a counter-current manner, the heat from the high-temperature flue gas can be transferred to the natural air to the maximum extent, bringing it to the temperature required for the primary air inlet.

[0038] like Figure 4 As shown, in this embodiment, the sulfur melting kettle device 52 mainly consists of a second induced draft fan 22, a medium-temperature flue gas inlet pipe 23, an outer protective cover 25, an internal rotating pipe 51, an inner wall of the sulfur melting kettle 26, a rotary motor 27, a stirring rod 29, a sulfur powder inlet 28, a liquid sulfur outlet pipe 38, a valve 37, and a medium-temperature flue gas outlet pipe 29. The medium-temperature flue gas flows out from the outlet of the air preheater 47 and is then driven by the second induced draft fan 22 to the sulfur melting kettle device 52. It flows from the bottom up, encircling the outside of the kettle body, and is discharged from the top for use in the subsequent acid production process. The outside of the sulfur melting kettle body is sealed by an outer protective cover 25, which is filled with a heat-conducting medium, sodium chloride thermally conductive salt, to cover the internal rotating pipe 51. The sodium chloride thermally conductive salt has a particle diameter of 2-5 mm and a bulk density of 0.8-1.2 g / cm³.3 The sodium chloride thermally conductive salt exchanges heat with the medium-temperature flue gas, raising its temperature and maintaining the temperature in the sulfur melting kettle above the melting point of sulfur (113℃), i.e., 130-150℃. However, excessively high temperatures are avoided to prevent sulfur decomposition or other chemical reactions. Heat is transferred to the solid sulfur powder particles inside the kettle through the outer wall, and the central stirring rod 29, driven by the rotary motor 27, continuously rotates and stirs the mixture. This ensures that the heat is quickly and evenly absorbed by the solid sulfur, melting it into a liquid state and greatly improving melting efficiency.

[0039] Sodium chloride thermal conductive salt: Its main component is sodium chloride. This thermal conductive salt has high thermal conductivity, which can quickly absorb the heat in high-temperature flue gas and transfer it to room-temperature air and sulfur powder, thereby improving the working efficiency of the equipment; low toxicity: It does not contain harmful substances, is non-toxic and harmless to the human body, and can ensure the safety of use; good stability: It has good chemical stability, with a melting point as high as 800℃ or above. Even at the working temperature of 650℃ high-temperature outlet flue gas in a sulfur incinerator, it is not easy to deteriorate or corrode, and has a long service life.

[0040] like Figure 5 As shown, the insulated settling tank 56 mainly consists of a liquid sulfur inlet pipe 38, an insulated wall 39, an impurity discharge pipe 40, a refined sulfur outlet pipe 41, an insulated wall 42, a fixed base 57, a first-stage valve 43, and a second-stage valve 44. Liquid sulfur settles at the bottom of the sulfur melting kettle 52 under its own gravity, and then flows into the insulated settling tank 56 through the bottom valve 37 and the liquid sulfur discharge pipe 38. Inside the insulated settling tank 56, the sulfur remains in a molten state and naturally settles after a period of settling, with heavier impurities settling to the bottom. Impurities at the bottom are discharged through the lower right outlet via the impurity discharge pipe 40, while higher-purity liquid sulfur is transported to the refined sulfur tank for temporary storage through the higher left outlet via the refined sulfur outlet pipe 41. The flow rate of the bottom pipes is controlled by the first-stage valve 43 and the second-stage valve 44. The refined sulfur tank can temporarily store liquid sulfur, and the metering pump can be adjusted according to the needs of the sulfur incinerator to meet the dosage of liquid sulfur injected into the incinerator.

[0041] like Figure 6 , 7As shown, the sulfur crusher device 53 in this embodiment mainly consists of a feeding hopper 36, a gate 55, hammers 33, a rotor 32, a discharge port 54, a transmission belt 35, a fixed frame 30, and a motor 31. The conveying device 58 mainly consists of a conveyor belt 59, an upper support roller group 60, a lower support roller group 61, a frame 62, a tensioning device 63, and a drive roller 64. To facilitate the sulfur melting process in the sulfur melting kettle device 52, solid sulfur is fed into the feeding hopper 36. The opening and closing degree of the gate 55 can be controlled as needed. The solid sulfur falls into the crusher and is crushed into granular powder after colliding with the high-speed rotating hammer blades 33. It is discharged from the discharge port 54 and falls onto the conveyor belt 59, which transports it to the top of the sulfur melting kettle device 52. Under the action of gravity, it falls into the kettle from the sulfur powder inlet 28 at the top of the sulfur melting kettle device 52. In this way, the granular powder sulfur is more easily rotated by the central agitator in the sulfur melting kettle device 52, resulting in a larger contact area with the wall, i.e., a larger heating area and faster melting. The hammer blades 33 of the sulfur crusher device 53 are made of high manganese steel, and the crusher speed is 3000 rpm. Crushing solid sulfur using the sulfur crusher device 53 before melting has the following advantages: Reduced volume: Crushing significantly reduces the volume of the solid, facilitating subsequent storage, transportation, and melting. Increased melting efficiency: Crushing increases the specific surface area of ​​the solid, making the melting process faster and more efficient. Improved melting quality: Crushed solid particles are more uniform, contributing to a more consistent molten product.

[0042] like Figure 8As shown, in this embodiment, the liquid sulfur inlet and the primary air inlet form a 17° angle. Thermocouples (including one set of thermocouples 5 on the left and three sets of thermocouples 6 on the right) are installed on the wall near the intersection of the angles of the liquid sulfur inlet and the primary air inlet to monitor the combustion temperature in real time, ensuring that the combustion temperature is within a reasonable range of 800-1050℃. If the temperature is found to be too high or too low, the mass flow rate and temperature of the inlet liquid sulfur and primary air can be adjusted accordingly. This maintains the combustion zone within the optimal combustion temperature range, thereby maintaining the highest combustion efficiency and preventing incomplete combustion of liquid sulfur, which would lead to a sharp increase in wear on internal components. This thermocouple arrangement and position allows for the collection of temperatures from four regions (up, down, left, and right), providing a more comprehensive and accurate reflection of the temperature in the liquid sulfur combustion zone. It also enables timely detection of abnormalities in the operation of the sulfur incinerator, allowing for early intervention, extending the equipment's operating cycle, and reducing equipment losses. Thermocouples have many advantages in temperature monitoring, such as high measurement accuracy: thermocouples can directly contact the substance being measured, thus sensing the temperature more accurately and providing high-precision measurement results. Wide temperature range: Thermocouples can adapt to different temperature environments, with a typical measurement range of -200 to 1300℃, thus meeting the needs of various application scenarios. Simple construction and easy to use: Thermocouples are usually composed of two different metal wires, with a simple structure that is easy to maintain and operate. Furthermore, the output signal of a thermocouple is an electric potential, requiring no external power supply during measurement, making it convenient to use. Good stability: Thermocouples are made of precious metals, thus possessing excellent stability and repeatability, maintaining measurement accuracy over long periods. Facilitates long-distance and multi-point measurements: The electrical signal output by a thermocouple can be easily transmitted and recorded, making it suitable for long-distance and multi-point measurement scenarios. Fast response speed: Thermocouples can quickly sense temperature changes and respond accordingly. Due to structural design, the flue gas mixes with secondary air, cools, and then passes above the lower baffle wall. Therefore, installing a thermocouple (including two sets of thermocouples 11 on the left and four sets of thermocouples 12 on the right) on the upper wall near the flue gas outlet 16 allows for real-time monitoring of the outlet flue gas temperature, ensuring it remains within a reasonable range of 550–750℃. If the temperature is too high or too low, the mass flow rate of the secondary air inlet can be adjusted accordingly. Excessive outlet flue gas temperature leads to reduced boiler thermal efficiency and energy waste. It can also cause thermal fatigue damage to components such as the tail heating surfaces, shortening equipment lifespan. Furthermore, it increases the concentration of pollutants such as nitrogen oxides, exacerbating environmental pollution and potentially triggering secondary combustion in the tail flue. Conversely, excessively low outlet flue gas temperature results in decreased boiler efficiency and underutilized heat. It may also increase the levels of pollutants such as carbon dioxide and nitrogen oxides in the flue gas, further aggravating environmental pollution. Therefore, real-time monitoring of the outlet flue gas temperature using thermocouples at this location helps to rationally control the inlet mass flow rate of the secondary air to regulate the outlet flue gas temperature, ensuring normal equipment operation and meeting environmental protection requirements.

Claims

1. A dual-material inlet sulfur incinerator, characterized in that, This includes a dual-material inlet sulfur incinerator body, an air preheater, a sulfur crushing device, and a sulfur melting kettle. The dual-material inlet sulfur incinerator has a flue gas outlet in the middle of its furnace body. A left liquid sulfur inlet and a right liquid sulfur inlet are respectively located at both ends of the furnace body. A primary air inlet group, an upper baffle wall, a secondary air inlet group, and a lower baffle wall are symmetrically arranged between the left and right liquid sulfur inlets and the flue gas outlet. The primary air inlet group is used to introduce primary air at 270-300℃, and the secondary air inlet group is used to introduce ambient temperature air. The air preheater includes a high-temperature flue gas inlet and a high-temperature flue gas outlet, a normal-temperature air inlet and a primary air outlet. The high-temperature flue gas inlet is connected to the flue gas outlet, and the primary air outlet is connected to the primary air inlet assembly. The air preheater is used to exchange heat between the high-temperature flue gas generated by the dual-material inlet sulfur incinerator and the normal-temperature air, thereby reducing the temperature of the high-temperature flue gas (550-750℃) to form medium-temperature flue gas (400-500℃) and increasing the temperature of the normal-temperature air to form primary air (270-300℃). The sulfur melting kettle device includes a medium-temperature flue gas inlet, a sulfur powder feed inlet, and a liquid sulfur discharge outlet. The medium-temperature flue gas inlet is connected to the high-temperature flue gas outlet, and the liquid sulfur discharge outlet is connected to the left and right liquid sulfur inlets. The sulfur melting kettle device uses the heat of the medium-temperature flue gas to melt solid sulfur powder into liquid sulfur. The sulfur crushing device is used to crush solid sulfur into solid sulfur powder and convey it to the sulfur powder feed inlet.

2. The dual-material inlet sulfur incinerator device according to claim 1, characterized in that, A heat-insulated settling box and a refined sulfur tank are also provided between the liquid sulfur discharge outlet and the liquid sulfur inlet. The heat-insulated settling box is used to keep the liquid sulfur in a molten state and allow impurities to be discharged through natural sedimentation. Liquid sulfur with higher purity is then transported to the refined sulfur tank for storage.

3. The dual-material inlet sulfur incinerator device according to claim 1, characterized in that, The primary air inlet group includes several primary air inlets evenly distributed around the furnace body, and the liquid sulfur inlet forms an angle of 12-17° with the primary air inlet.

4. The dual-material inlet sulfur incinerator device according to claim 3, characterized in that, A first thermocouple assembly is installed on the furnace wall where the angle between the liquid sulfur inlet and the primary air inlet intersects, and a second thermocouple is installed on the furnace wall near the flue gas outlet.

5. The dual-material inlet sulfur incinerator device according to claim 4, characterized in that, The first thermocouple group consists of four thermocouples, which are respectively located at the top, bottom, left, and right sides of the furnace body; the second thermocouple consists of one thermocouple, which is located on the upper wall of the furnace body.

6. The dual-material inlet sulfur incinerator according to claim 1, characterized in that, The height of the upper and lower baffle walls is 3 / 4 of the furnace body diameter.

7. The dual-material inlet sulfur incinerator according to claim 1, characterized in that, A liquid sulfur spray gun is installed at the liquid sulfur inlet.

8. The dual-material inlet sulfur incinerator device according to claim 1, characterized in that, An induced draft fan is installed between the flue gas outlet and the high-temperature flue gas inlet, at the ambient air inlet, and between the high-temperature flue gas outlet and the medium-temperature flue gas inlet.

9. The dual-material inlet sulfur incinerator according to claim 1, characterized in that, Both the air preheater and the sulfur melting kettle are filled with sodium chloride thermally conductive salt as the thermally conductive medium, with a particle diameter of 2-5 mm and a bulk density of 0.8-1.2 g / cm³. 3 .

10. The dual-material inlet sulfur incinerator according to claim 1, characterized in that, The sulfur melting kettle is equipped with an agitator inside.

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