Temperature regulation and control device for outlet gas of sulfur burning furnace

Abstract

The utility model discloses an outlet gas temperature regulation and control device of a sulfur burning furnace. The outlet gas temperature regulation and control device comprises a graded regulation and control valve body, a multi-point temperature measurement assembly and a uniform flow temperature control cavity, the graded regulation and control valve body, the multi-point temperature measurement assembly and the uniform flow temperature control cavity are connected in series step by step and are mounted on a furnace gas main pipe at the rear end of the sulfur burning furnace; through the synergistic effect of graded adjustment, multi-point monitoring and forced flow uniformizing, the problems that a traditional device is large in temperature fluctuation and uneven in mixing are solved, the regulation and control precision is improved, and the energy consumption and the maintenance cost of the sulfur acid making process are remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of inorganic chemical equipment technology, specifically to a temperature control device for high-temperature gas at the outlet of a sulfur incinerator in sulfuric acid production, which is particularly suitable for scenarios involving precise temperature control of high-temperature furnace gas (containing sulfur dioxide) between the sulfur incinerator and the converter. Background Technology

[0002] In the sulfur-to-acid production process, the high-temperature gas (approximately 950–1000°C) generated by the sulfur incinerator combustion needs to have its heat recovered by a waste heat boiler before entering the converter, where it is converted into sulfur trioxide through the action of a catalyst. The converter has strict requirements for the inlet gas temperature (usually it needs to be stable within a specific range, such as 400–450°C). If the temperature is too high, the catalyst activity will decrease, and if the temperature is too low, the reaction activation conditions cannot be met, both of which will reduce the conversion rate.

[0003] In existing technologies, a bypass pipe is typically installed between the sulfur incinerator and the waste heat boiler, with a temperature regulating valve on the bypass pipe. This allows for the introduction of some high-temperature gas that has not been cooled by the waste heat boiler, which is then mixed with the low-temperature gas from the waste heat boiler outlet to regulate the gas temperature entering the converter. However, the following problems exist in actual operation:

[0004] The control precision is significantly limited: a single-stage control structure cannot achieve precise step-by-step control of flow rate; the linear correlation between valve opening and actual flow rate is poor; and temperature fluctuations of more than ±15℃ are prone to occur in low-flow-rate control scenarios. Due to the lack of a graded control mechanism, it is impossible to match the corresponding adjustment amplitude according to different temperature deviation ranges, resulting in a lag in dynamic response.

[0005] Insufficient gas mixing uniformity: The high-temperature bypass gas and the low-temperature gas in the main pipeline mix only by natural convection, which easily leads to temperature stratification. The gas entering the converter has local temperature differences (up to 20°C or more), resulting in uneven reaction efficiency of the catalyst bed and affecting the overall conversion effect.

[0006] Insufficient wear resistance of components: High-temperature sulfur-containing gases cause severe erosion and corrosion to valve seals and valve plates. Single-stage valve plates are prone to deformation under long-term airflow impact, leading to valve jamming or leakage. At the same time, the traditional linkage structure between the valve stem and valve plate lacks stable guidance, which can easily exacerbate component wear due to radial misalignment, increasing the frequency of downtime maintenance.

[0007] Temperature measurement accuracy is limited: Traditional single-point temperature measurement can only reflect the local temperature of the pipeline and cannot capture the temperature distribution gradient of the cross section. It often leads to misjudgment of control due to local temperature measurement deviation. The lack of multi-point collaborative temperature measurement and intelligent feedback mechanism makes it difficult to achieve accurate adjustment based on the temperature field of the entire cross section.

[0008] Therefore, in order to address the problems of insufficient temperature control accuracy, uneven gas mixing, rapid component wear and poor temperature measurement representativeness in existing technologies, there is an urgent need for a new type of device that integrates a graded control valve body, a multi-point temperature measurement component and a uniform flow temperature control cavity. Through structural optimization, it can achieve stepped flow regulation, full-section temperature monitoring and forced gas uniform flow, thereby improving the stability of temperature control, enhancing the uniformity of mixing and extending the service life of the equipment. Summary of the Invention

[0009] To achieve the above objectives, this utility model provides a sulfur incinerator outlet gas temperature control device, the specific structure of which is as follows: it includes a staged control valve body, a multi-point temperature measuring component, and a uniform flow temperature control chamber; the staged control valve body, the multi-point temperature measuring component, and the uniform flow temperature control chamber are installed in series in stages on the furnace gas main pipe at the rear end of the sulfur incinerator.

[0010] The inlet of the graded control valve body is connected in series with the main gas pipe of the waste heat boiler. The graded control valve body is equipped with a stepped adjustment structure: a primary adjustment zone and a secondary adjustment zone are arranged sequentially along the gas flow direction. The primary adjustment zone corresponds to the inlet of the valve pipe branch and is equipped with a main valve plate with a diameter adapted to the valve pipe branch. A secondary valve plate with a diameter of 1 / 2 of the valve pipe inner diameter is also provided. The main valve plate and the secondary valve plate are linked by the same valve stem. A main valve reversing mechanism and a secondary valve reversing mechanism are installed on the valve stem. The main valve reversing mechanism and the main valve plate are connected by a reversing gear. The secondary valve reversing mechanism and the secondary valve plate are connected by a reversing gear. The main valve reversing mechanism and the secondary valve reversing mechanism are connected by a screw, which is connected to a servo motor through a coupling.

[0011] The multi-point temperature measurement component is located downstream of the graded control valve body and includes multiple temperature measuring sleeves evenly distributed along the pipe circumference. The temperature measuring sleeves are connected to the inside of the pipe, and a high-temperature thermocouple is installed inside the sleeve. The thermocouple probes point into the inside of the pipe to detect the temperature inside the pipe. It also includes a temperature controller. The sensor input signal of the temperature controller is connected to the output signal of the high-temperature thermocouple inside the temperature measuring sleeve, and the temperature controller is connected to the servo motor controller of the graded control valve body through a signal line.

[0012] The uniform flow temperature control cavity is connected in series between the multi-point temperature measurement component and the converter. It includes a baffle plate seat, baffle plates, and a cavity. Multiple baffle plates are equidistantly distributed along the axis of the baffle plate seat, and adjacent baffle plates are arranged at equal angles along the circumference of the baffle plate seat axis.

[0013] As a preferred option, the secondary regulation zone is located 50-80mm downstream of the primary regulation zone, forming a height difference.

[0014] Furthermore, the axis of the temperature measuring sleeve forms a 30° angle with the main gas pipe of the furnace.

[0015] Furthermore, a turbulence structure is formed by welding the turbulence plate seat and the turbulence plate in the uniform flow temperature control cavity. The turbulence structure is welded to the inner wall of the cavity through the triangular spike tip on the turbulence plate seat; 6-8 turbulence plates are provided.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Improved temperature control accuracy: A stepped control structure is formed by the primary and secondary control zones within the valve body. The main valve plate and the auxiliary valve plate are linked through the same valve stem. With the coordinated action of the main valve switching mechanism and the auxiliary valve switching mechanism, fine-grained graded control of gas flow can be achieved. This effectively improves the problem of poor linearity between flow rate and opening degree in traditional single-stage control, significantly reduces temperature fluctuation amplitude, and ensures that the gas temperature entering the converter remains stable within the target range.

[0018] Enhancing gas temperature uniformity: Multiple turbulence vanes in the uniform flow temperature control cavity are equidistantly distributed along the vane seat axis and adjacent vanes are arranged at equal angles around the circumference, which can fully turbulent the gas and promote the uniform mixing of high-temperature and low-temperature gases. At the same time, the multi-point temperature measurement component performs full-section temperature detection through multiple temperature measuring sleeves evenly distributed along the pipe circumference, avoiding the limitations of single-point temperature measurement, providing comprehensive temperature information for precise control, and reducing the impact of local temperature differences in the gas on catalyst efficiency.

[0019] Improving component operational stability and lifespan: The adaptive design of the main valve plate and valve pipe branch in the graded control valve body, as well as the gear connection method of the related reversing mechanism, reduces the radial offset and wear of the valve plate and valve stem; the servo motor is connected to the reversing mechanism through the screw, ensuring stable transmission, reducing the occurrence of problems such as component jamming and leakage, reducing the frequency of downtime maintenance, and extending the overall service life of the device.

[0020] Intelligent linkage control is achieved: The temperature controller receives signals from the high-temperature thermocouples in the multi-point temperature measurement component and links with the servo motor controller of the graded control valve to form a closed-loop regulation system. It can automatically adjust the opening of the main and auxiliary valve plates according to the detected temperature changes, quickly respond to temperature fluctuations, and improve the automation level and timeliness of regulation. Attached Figure Description

[0021] For ease of explanation, this utility model is described in detail below with reference to the specific embodiments and accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall connection structure between the present invention and the furnace body;

[0023] Figure 2 This is a schematic diagram showing the connections between the components of this utility model.

[0024] Figure 3A schematic cross-sectional view of the graded control valve body;

[0025] Figure 4 This is a schematic diagram of the multi-point temperature measurement component.

[0026] Figure 5 This is a schematic diagram of the uniform flow temperature control cavity;

[0027] Figure 6 This is a schematic diagram of the turbulence structure;

[0028] Figure 7 This is a schematic diagram showing the circumferential distribution of the turbulence-dispersing plates in the uniform flow temperature control cavity.

[0029] Explanation of markings in the diagram:

[0030] 1-Graded control valve body; 2-Multi-point temperature measurement component; 3-Flow uniform temperature control cavity; 4-Furnace gas main pipe; 6-Converter; 11-Main valve plate; 12-Subsidiary valve plate; 13-Valve stem; 14-Main valve reversing mechanism; 15-Subsidiary valve reversing mechanism; 16-Screw; 17-Servo motor; 18-Valve pipe branch pipe; 21-Temperature measuring sleeve; 22-Temperature controller; 31-Breakout plate seat; 32-Breakout plate; 33-Cavity; A-Primary regulation zone; B-Secondary regulation zone. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 7 As shown, a sulfur incinerator outlet gas temperature control device includes a graded control valve body 1, a multi-point temperature measuring component 2, and a uniform flow temperature control chamber 3; the graded control valve body 1, the multi-point temperature measuring component 2, and the uniform flow temperature control chamber 3 are connected in series along the gas flow direction to the furnace gas main pipe 4 at the rear end of the sulfur incinerator, forming a complete temperature control link.

[0033] like Figure 3 As shown, the inlet of the graded control valve body 1 is sealed to the main gas pipe 4 of the waste heat boiler. Internally, it adopts a stepped adjustment structure: a primary adjustment zone A and a secondary adjustment zone B are sequentially arranged along the gas flow direction. The secondary adjustment zone B is located 50-80mm downstream of the primary adjustment zone A, forming a height difference. Graded throttling is achieved through the stepped change in the flow channel cross-section. The primary adjustment zone A corresponds to the inlet position of the valve pipe branch pipe 18 and is equipped with a main valve plate 11 whose diameter matches the inner diameter of the valve pipe branch pipe 18. The secondary adjustment zone B has a built-in auxiliary valve plate 12 with a diameter equal to half the inner diameter of the valve pipe. The main valve plate 11 and the auxiliary valve plate 12 achieve linked adjustment through the same valve stem 13.

[0034] The multi-point temperature measurement assembly 2 is installed in the downstream pipeline of the graded control valve body 1. It consists of multiple temperature measuring sleeves 21 evenly distributed around the circumference of the main gas pipe 4 and a temperature controller 22. The axis of the temperature measuring sleeve 21 is inserted into the main gas pipe 4 at a 30° angle. A K-type high-temperature thermocouple (temperature range 0-1300℃) is encapsulated inside the sleeve, and the thermocouple probe extends to the center area of ​​the pipeline to obtain a representative temperature. The temperature controller 22 adopts PID regulation mode. Its input is connected in parallel with multiple sets of thermocouple signals, and its output is connected to the driver of the servo motor 17 through a shielded signal line to form a closed-loop control circuit.

[0035] The uniform flow temperature control cavity 3 is connected in series between the multi-point temperature measurement component 2 and the converter 6, and consists of a baffle plate seat 31, a baffle plate 32, and a cavity 33. Figures 5-7 As shown, the spoiler seat 31 and eight spoilers 32 are welded together using a high-temperature resistant alloy. Adjacent spoilers 32 are evenly spaced along the axis of the spoiler seat 31, forming a spiral spoiler channel. The entire spoiler structure is fixed to the inner wall of the cavity 33 by welding the triangular spikes at the end of the spoiler seat 31. The triangular spike design can disperse stress concentration and improve the structure's impact resistance.

[0036] Workflow Description:

[0037] Initial adjustment stage: The high-temperature gas (950-1000℃) from the sulfur incinerator outlet is cooled by the waste heat boiler and then enters the staged control valve body 1 through the main gas pipe 4. At this time, the temperature controller 22 presets the target temperature (400-450℃) at the inlet of the converter 6. The servo motor 17 drives the screw 16 to rotate according to the initial temperature difference. The opening of the main valve plate 11 and the auxiliary valve plate 12 are synchronously adjusted through the main valve reversing mechanism 14 and the auxiliary valve reversing mechanism 15: the main valve plate 11 controls the high-temperature bypass gas volume of the valve pipe branch pipe 18, and the auxiliary valve plate 12 adjusts the low-temperature gas volume of the main line to achieve initial temperature mixing.

[0038] Precise temperature control stage: The mixed gas enters the multi-point temperature sensing component 2. Thermocouples inside the temperature sensing sleeve 21 simultaneously detect the temperature at different locations on the pipe cross-section. The temperature controller 22 performs weighted averaging of the collected data. When the actual temperature deviates from the target temperature by more than ±5℃, the controller outputs an adjustment signal.

[0039] When the temperature difference is greater than 5℃, the servo motor 17 rotates in the forward direction, the main valve plate 11 closes slightly (reducing high-temperature gas), and the auxiliary valve plate 12 opens wider (increasing low-temperature gas);

[0040] When the temperature difference is less than -5℃, the servo motor 17 rotates in the opposite direction, the main valve plate 11 opens wider and the auxiliary valve plate 12 closes less, and the adjustment response time is ≤2 seconds.

[0041] Uniform flow mixing stage: The regulated gas enters the uniform flow temperature control chamber 3, where it forms a strong turbulent state under the action of 8 spirally distributed baffles 32, allowing the gas to complete secondary mixing within the chamber 33 and eliminating local temperature gradients (temperature difference at the cross section after mixing ≤3℃). The gas at the final stable temperature enters the converter 6 through the outlet pipe, meeting the temperature requirements of the catalytic reaction.

[0042] Adaptive adjustment characteristics: When the system detects that the flow fluctuation in the furnace gas main pipe 4 exceeds 10%, the temperature controller 22 automatically switches the adjustment mode: When the flow rate is low (<50% of the rated flow rate), the auxiliary valve plate 12 takes the lead in adjustment (adjustment accuracy ±2℃); when the flow rate is high (≥50% of the rated flow rate), the main valve plate 11 and the auxiliary valve plate 12 adjust together to ensure the temperature control stability across the entire flow range.

[0043] This invention solves the problems of large temperature fluctuations and uneven mixing in traditional devices through the synergistic effect of graded adjustment, multi-point monitoring and forced uniform flow, improves the control precision and significantly reduces the energy consumption and maintenance costs of the sulfuric acid production process.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A device for regulating the outlet gas temperature of a sulfur incinerator, characterized in that, It includes a graded control valve body (1), a multi-point temperature measuring component (2), and a uniform flow temperature control cavity (3); the graded control valve body (1), the multi-point temperature measuring component (2), and the uniform flow temperature control cavity (3) are installed in series in stages on the furnace gas main pipe (4) at the rear end of the sulfur combustion furnace; The inlet of the graded control valve body (1) is connected in series with the main gas pipe (4) of the waste heat boiler. The graded control valve body (1) is provided with a stepped adjustment structure: a primary adjustment zone (A) and a secondary adjustment zone (B) are provided sequentially along the gas flow direction. The primary adjustment zone (A) corresponds to the inlet of the valve pipe branch (18) and is provided with a main valve plate (11) with a diameter adapted to the valve pipe branch (18); and a secondary valve plate (12) with a diameter of 1 / 2 of the valve pipe inner diameter is provided. The main valve plate (11) and the secondary valve plate (12) are connected by a series connection. The valve stem (13) is linked together; a main valve reversing mechanism (14) and a secondary valve reversing mechanism (15) are installed on the valve stem (13); the main valve reversing mechanism (14) and the main valve plate (11) are connected by a reversing gear; the secondary valve reversing mechanism (15) and the secondary valve plate (12) are connected by a reversing gear; the main valve reversing mechanism (14) and the secondary valve reversing mechanism (15) are connected by a connecting screw (16), and the connecting screw (16) is connected to a servo motor (17) through a coupling; The multi-point temperature measurement component (2) is located after the graded control valve body (1) and includes multiple temperature measuring sleeves (21) evenly distributed along the pipe circumference. The temperature measuring sleeves (21) are connected to the inside of the pipe. A high-temperature thermocouple is installed inside the sleeve, and the thermocouple probe points into the inside of the pipe to detect the temperature inside the pipe. It also includes a temperature controller (22). The sensor input signal of the temperature controller (22) is connected to the output signal of the high-temperature thermocouple inside the temperature measuring sleeve (21), and the temperature controller (22) is connected to the servo motor (17) controller of the graded control valve body (1) through a signal line. The uniform flow temperature control cavity (3) is connected in series between the multi-point temperature measurement component and the converter (6), including a baffle plate seat (31), baffle plates (32) and a cavity (33). Multiple baffle plates (32) are distributed at equal intervals along the axis of the baffle plate seat (31), and adjacent baffle plates (32) are arranged at equal angles along the circumference of the baffle plate seat (31).

2. The sulfur incinerator outlet gas temperature control device according to claim 1, characterized in that: The secondary regulation zone (B) is located 50-80mm downstream of the primary regulation zone (A), forming a height difference.

3. The sulfur incinerator outlet gas temperature control device according to claim 1, characterized in that: The axis of the temperature measuring sleeve (21) forms a 30° angle with the main gas pipe (4).

4. The sulfur incinerator outlet gas temperature control device according to claim 1, characterized in that: The turbulence structure is formed by welding the turbulence plate seat (31) and the turbulence plate (32) of the uniform flow temperature control cavity (3). The turbulence structure is welded to the inner wall of the cavity (33) through the triangular spike tip on the turbulence plate seat (31); the turbulence plate (32) is provided with 6-8 pieces.

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