A coke oven heat recovery heat shock resistant high rigidity gas collecting pipe

Abstract

The utility model discloses a kind of waste heat recovery coke oven heat shock resistance high rigidity gas collector, including gas pipe assembly and self-adapting support assembly. Gas pipe assembly adopts four-layer composite structure, inner layer is silicon carbide ceramic tube, resist high-temperature waste gas corrosion;Flexible graphite thermal stress buffer layer absorbs thermal stress, GH3030 alloy spiral spring constitutes metal support layer to provide rigidity and release thermal stress, nano aerogel felt layer realizes high-efficiency heat preservation. Ceramic tube inner wall is equipped with ultrasonic generator, can periodically remove dust coking. In self-adapting support assembly, support foot bottom pressure sensor real-time acquisition pressure data, after analysis by PLC control system, drive servo motor and hydraulic cylinder adjust support state, ensure that gas collector is horizontal. The gas collector is through material and structural innovation, effectively solve traditional gas collector heat shock, corrosion, dust and unstable problem of support, improve heat shock resistance performance and rigidity, reduce heat loss, reduce maintenance cost, guarantee coking production high-efficiency stable operation.

Description

Technical Field

[0001] This utility model relates to the technical field of coking production equipment, and in particular to a high-rigidity gas collecting pipe with thermal shock resistance for waste heat recovery coke ovens. Background Technology

[0002] In the coking production sector, the waste heat recovery coke oven gas collecting pipe is a key piece of equipment for transporting high-temperature waste gas and achieving efficient utilization of waste heat. Its performance directly affects the energy utilization rate and operational stability of the coke oven. With the increasing demands for energy conservation, emission reduction, and safe production in the coking industry, the development of gas collecting pipes with excellent thermal shock resistance, high rigidity, and efficient insulation capabilities has become a key research direction for the industry.

[0003] The prior art CN212199114U discloses a thermal shock resistant high-rigidity gas collecting pipe for waste heat recovery coke ovens. It adopts a tubular surface heat-resistant refractory layer formed by refractory bricks, a pipe shell is set on the outer periphery of the surface heat-resistant refractory layer, and ceramic fiber felt is laid on the pipe shell wall. At the same time, a corrugated shock-absorbing steel plate is set between the surface heat-resistant refractory layer and the ceramic fiber felt to form a heat-insulating cavity. The space between the shock-absorbing steel plate and the ceramic fiber felt is filled with a honeycomb ceramic layer. In addition, a pipe shell support plate and an outer pipe shell support rib are set below the pipe shell. By using a support plate with a specific angle and support ribs arranged along the radial direction, the aim is to improve the thermal shock resistance, heat preservation performance and overall support rigidity of the gas collecting pipe.

[0004] However, this existing technology still has many shortcomings. In terms of materials and structure, the surface-heated refractory layer constructed with refractory bricks has seams, allowing high-temperature exhaust gases to easily penetrate and erode the internal structure. After long-term use, these seams are prone to damage, affecting overall sealing and service life. While corrugated shock-absorbing steel plates can alleviate thermal stress to some extent, the difference in thermal expansion coefficients between the steel plates and other materials under extreme temperature changes can still lead to structural deformation or cracking. Regarding insulation performance, the insulation effect of ceramic fiber felt and honeycomb ceramic layers is limited, making it difficult to meet the demands of modern coking production for efficient waste heat recovery. Significant heat loss will lower the temperature of the flue gas entering the waste heat power generation boiler, resulting in energy waste. In terms of support structure, the fixed angle and layout of the pipe shell support plates and ribs cannot adaptively adjust to changes in stress during the actual operation of the gas collecting pipe. When the gas collecting pipe deforms unevenly due to thermal expansion or gravity, it is difficult to provide effective stable support, posing safety hazards such as pipe cracking and gas leakage. Therefore, there is an urgent need for a new technology for high-rigidity, thermal shock-resistant gas collecting pipes for waste heat recovery coke ovens to overcome the shortcomings of existing technologies and meet the growing demand for efficient, safe, and energy-saving production in the coking industry. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-rigidity gas collecting pipe for waste heat recovery coke ovens that is resistant to thermal shock.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-rigidity, thermal shock resistant gas collecting pipe for waste heat recovery coke ovens includes a gas pipe assembly and an adaptive support assembly. The innermost layer of the gas pipe assembly is a ceramic tube, the outer periphery of which is covered with a thermal stress buffer layer. The thermal stress buffer layer is covered with a metal support layer, and the metal support layer is covered with a nano-aerogel felt layer. The metal support layer consists of multiple GH3030 alloy helical springs arranged in an equidistant circular array around the thermal stress buffer layer. The adaptive support assembly includes four support seats located at the bottom of the gas pipe assembly. Each support seat has a hydraulic cylinder hinged to its bottom. The hydraulic rod at the bottom of the hydraulic cylinder is hinged to a support foot via a pin. Each support foot has a pressure sensor embedded at its bottom.

[0008] The above technical solution employs a composite structure consisting of a ceramic tube, a thermal stress buffer layer, a metal support layer, and a nano-aerogel felt layer. The silicon carbide ceramic tube directly resists the corrosion and thermal shock of high-temperature exhaust gases; the flexible graphite thermal stress buffer layer absorbs the thermal stress generated by the differences in the coefficients of thermal expansion of each layer; the metal support layer, composed of GH3030 alloy helical springs, provides both rigid support and releases thermal stress through elastic deformation; and the nano-aerogel felt layer achieves efficient heat preservation, reducing heat loss. The adaptive support component monitors the pressure at the support point of the gas collecting pipe in real time through a pressure sensor, and automatically adjusts the support state in conjunction with a hydraulic cylinder and a servo motor to ensure the gas collecting pipe is horizontal, reduce sagging deformation caused by gravity or thermal expansion, and improve stability.

[0009] Preferably, the ceramic tube is made of silicon carbide ceramic material.

[0010] Through the above technical solutions, ceramic tubes made of silicon carbide ceramic material have the characteristics of high melting point, high temperature resistance, and corrosion resistance, which can significantly improve the corrosion resistance and thermal shock resistance of the inner wall of the gas collecting pipe, extend the service life of the gas collecting pipe under harsh working conditions, and ensure long-term stable operation.

[0011] Preferably, the thermal stress buffer layer is made of flexible graphite material.

[0012] Through the above technical solution, the thermal stress buffer layer made of flexible graphite material, with its porous structure and flexibility, can effectively alleviate the thermal stress caused by the difference in thermal expansion coefficients between the ceramic tube and the metal support layer, avoid structural damage caused by thermal stress concentration, enhance the overall thermal shock resistance of the gas collection pipe, and improve structural reliability.

[0013] Furthermore, servo motors are fixed to the side walls of the support base, and the output shafts of the servo motors are connected to the hydraulic cylinders along the hinge point between the support base and the hydraulic cylinders.

[0014] The above technical solution involves a servo motor fixed to the side wall of the support base, which connects to the hinge shaft of the hydraulic cylinder to achieve precise adjustment of the hydraulic cylinder angle. When the pressure sensor detects abnormal pressure at the air collection pipe support point, the servo motor can respond quickly, cooperating with the hydraulic pump to adjust the extension and retraction of the hydraulic rod, allowing the air collection pipe to quickly return to a horizontal position. This effectively addresses minor deformations during the operation of the air collection pipe, improving the adjustment accuracy and response speed of the adaptive support component.

[0015] Furthermore, the inner wall of the ceramic tube is equipped with multiple ultrasonic generators.

[0016] The above technical solution involves multiple ultrasonic generators installed on the inner wall of the ceramic tube, which vibrate at a high frequency of 20-40kHz to loosen and remove contaminants such as ash and coke adhering to the inner wall. These contaminants are then discharged through the ash discharge port, achieving automatic cleaning of the inner wall of the gas collection pipe. This reduces the frequency of manual cleaning and maintenance costs, while also keeping the pipe unobstructed, reducing airflow resistance, and improving waste heat recovery efficiency.

[0017] Preferably, pressure sensors collect real-time contact pressure data between the support feet and the ground, and transmit analog signals to the PLC control system via shielded cables. The PLC control system has a built-in pressure analysis and adjustment program that compares the data collected by each pressure sensor with preset pressure thresholds and average values. When the pressure at a certain support point deviates from the average value by more than 10%, the PLC control system outputs a control signal to the servo motor on the side wall of the corresponding support base. The servo motor drives the output shaft to rotate according to the control signal, which in turn drives the hinge shaft of the hydraulic cylinder to rotate through the coupling, thereby adjusting the angle of the hydraulic cylinder. At the same time, the PLC control system sends a command to the hydraulic pump to adjust the extension and retraction of the hydraulic rod until the pressure at each support point is balanced. The ultrasonic generator on the inner wall of the ceramic tube is connected to an external controller. The external controller sends start and stop signals to the ultrasonic generator at preset periodic cleaning modes, causing the ultrasonic generator to generate high-frequency vibrations at a working frequency of 20-40kHz to remove contaminants from the inner wall of the ceramic tube.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model achieves multiple beneficial effects through innovative design. The composite gas pipe assembly, composed of a silicon carbide ceramic tube, a flexible graphite thermal stress buffer layer, a GH3030 alloy helical spring metal support layer, and a nano-aerogel felt layer, leverages the high-temperature and corrosion resistance of the ceramic, the rigid support and stress absorption of the spring, and the efficient heat insulation of the aerogel to improve the gas collecting pipe's thermal shock resistance, corrosion resistance, and waste heat recovery efficiency. Furthermore, by installing an ultrasonic generator on the inner wall of the ceramic tube, it automatically removes accumulated ash and coke, ensuring unobstructed flow within the pipe. In the adaptive support assembly, a pressure sensor monitors in real time, combined with the automatic adjustment of a servo motor and hydraulic cylinder, precisely controlling the horizontality of the gas collecting pipe and reducing sagging deformation. The overall solution effectively solves the problems of thermal shock, corrosion, ash accumulation, and unstable support in traditional gas collecting pipes, significantly improving service life and operational stability, while also offering advantages of high efficiency, energy saving, and low maintenance costs.

[0020] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a thermal shock resistant, high-rigidity gas collecting pipe for a waste heat recovery coke oven proposed in this utility model.

[0022] Figure 2 This is a side view of the end structure of a thermal shock resistant high-rigidity gas collecting pipe for a waste heat recovery coke oven proposed in this utility model.

[0023] Figure 3 This is a schematic diagram of the internal cross-sectional structure of a thermal shock resistant high-rigidity gas collecting pipe for a waste heat recovery coke oven proposed in this utility model.

[0024] Figure 4 This utility model proposes a high-rigidity, thermal shock-resistant gas collecting pipe for waste heat recovery coke ovens. Figure 3 Enlarged schematic diagram of a local structure at point A;

[0025] Figure 5 This is a schematic diagram of the adaptive support component structure of a thermal shock resistant high-rigidity gas collecting pipe for a waste heat recovery coke oven proposed in this utility model.

[0026] In the diagram: 1. Tracheal assembly; 101. Ceramic tube; 102. Thermal stress buffer layer; 103. Nano-aerogel felt layer; 104. Metal support layer; 2. Adaptive support assembly; 201. Support base; 202. Servo motor; 203. Hydraulic cylinder; 204. Support leg; 205. Pin; 3. Ultrasonic generator; 4. Pressure sensor. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1, referring to Figures 1 to 5

[0029] I. Specific Structure of Tracheal Component 1

[0030] like Figure 1 as well as Figure 3 As shown, the tracheal assembly 1 adopts a four-layer composite structure design, consisting of a ceramic tube 101, a thermal stress buffer layer 102, a metal support layer 104, and a nano-aerogel felt layer 103, from the inside out.

[0031] Ceramic tube 101: Made of silicon carbide ceramic material, formed by centrifugal casting, with a smooth inner wall and uniform thickness. The high-temperature resistance and corrosion resistance of silicon carbide ceramic directly cope with the scouring of high-temperature exhaust gas from the coke oven.

[0032] Thermal stress buffer layer 102: Made of flexible graphite material, the 1-2mm thick graphite felt is tightly bonded to the outer periphery of the ceramic tube 101 using a high-temperature resistant adhesive. The porous structure and flexibility of the graphite felt can effectively absorb the thermal stress generated by the difference in thermal expansion coefficients between the ceramic tube and the metal support layer.

[0033] Metal support layer 104: Consists of multiple GH3030 alloy helical springs fixed to the outer periphery of the thermal stress buffer layer 102 in an equidistant circular array. The helical springs have a pitch of 20-30 mm and a spring wire diameter of 5-8 mm. The two ends of the springs are fixed to the annular positioning bosses of the ceramic tube (not shown in the figure) by high-temperature welding. The high-temperature strength of GH3030 alloy and the elastic deformation capability of the helical structure provide both rigid support and release thermal stress through the slight expansion and contraction of the springs.

[0034] Nano-aerogel felt layer 103: A nano-aerogel felt with a thickness of 5-10mm is used to cover the outside of the metal support layer 104 in an overlapping manner, and is tied and fixed with high-temperature resistant fiber rope at intervals of 50-100mm to form a high-efficiency heat insulation layer.

[0035] like Figure 2As shown, 8-12 ultrasonic generators 3 are evenly distributed in a ring array on the inner wall of the ceramic tube 101, with an axial spacing of 300-500 mm between adjacent ultrasonic generators. The ultrasonic generators are connected to an external controller (not shown in the figure) via high-temperature resistant wires and an outer ceramic insulating sleeve. The controller can be set to a periodic cleaning mode. When the ultrasonic generators are working, the high-frequency vibrations loosen and remove contaminants such as accumulated dust and coke adhering to the inner wall. The removed material is discharged through a conical ash discharge port (not shown in the figure, diameter 50-80 mm) at the bottom of the air tube assembly.

[0036] II. Specific Construction of Adaptive Support Component 2

[0037] like Figure 3 as well as Figure 5 As shown, the adaptive support assembly 2 includes four support seats 201, symmetrically fixed to the bottom of the air tube assembly 1. A servo motor 202 is fixed to the side wall of each support seat 201 by bolts. The output shaft of the servo motor is connected to the hinge shaft of the hydraulic cylinder 203 through a coupling, so as to realize the precise adjustment of the angle of the hydraulic cylinder.

[0038] Hydraulic cylinder 203: The end of the hydraulic rod is hinged to the support leg 204 via a pin 205. The bottom of the support leg 204 has a groove, in which the pressure sensor 4 is embedded and sealed with high-temperature resistant sealant to prevent high-temperature dust from entering.

[0039] Control Logic: Pressure sensor 4 collects the contact pressure between the support foot and the ground in real time, and the signal is transmitted to the PLC control system (not shown in the figure) through a shielded cable. When the pressure at a certain support point deviates from the average value by more than 10%, the PLC controls the corresponding servo motor to adjust the angle of the hydraulic cylinder, and at the same time drives the hydraulic pump to adjust the extension and retraction of the hydraulic rod until the pressure at each support point is balanced, ensuring that the horizontal error of the air pipe assembly is ≤1mm / m.

[0040] The servo motor (202) is a high-temperature resistant servo motor, and the motor housing is equipped with heat dissipation fins to enhance heat dissipation performance in high-temperature environments.

[0041] The bottom surface of the support legs is made of 204 stainless steel with anti-slip texture to increase friction with the ground and prevent the support structure from sliding.

[0042] The hinge point between the hydraulic cylinder 203 and the support base 201 uses a self-lubricating bearing to reduce wear on the hinge and ensure long-term reliable rotation.

[0043] III. Overall Assembly and Work Process

[0044] First, the ultrasonic generator 3 on the inner wall of the ceramic tube 101 is fixed with a high-temperature resistant adhesive, and the wire is led out from the pre-reserved wire hole in the ceramic tube.

[0045] A flexible graphite thermal stress buffer layer 102 is adhered to the outer periphery of the ceramic tube, ensuring no air bubbles or wrinkles. After the adhesive cures, GH3030 alloy helical springs are welded to the outer periphery of the buffer layer in an equidistant circular array. A nano-aerogel felt layer 103 is then wrapped around the tube and secured with fiber rope to form a complete air tube assembly 1.

[0046] Four support bases 201 are welded to the bottom of the air pipe assembly, and servo motor 202, hydraulic cylinder 203 and support foot 204 are installed. Pressure sensor 4 is connected to PLC control system through wires.

[0047] Workflow principle:

[0048] Normal operation: When high-temperature exhaust gas passes through ceramic tube 101, silicon carbide ceramic resists corrosion and thermal shock, GH3030 alloy helical spring supports the tube body and absorbs thermal stress, and nano aerogel felt layer reduces heat loss.

[0049] Adaptive adjustment: Pressure sensor 4 monitors the pressure at each support point in real time. When the gas collection pipe undergoes slight deformation due to gravity or thermal expansion, such as a sag of >3mm, the PLC controls the servo motor to adjust the angle of the hydraulic cylinder, and the hydraulic rod extends and retracts to compensate for the height difference, ensuring that the pipe is level.

[0050] Self-cleaning process: The controller starts the ultrasonic generator 3 according to the preset cycle. The high-frequency vibration of 20-40kHz removes the contaminants on the inner wall. The detached material is discharged through the ash discharge port to maintain the unobstructed flow in the pipeline.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A thermal shock resistant, high-rigidity gas collecting pipe for a waste heat recovery coke oven, comprising a gas pipe assembly (1) and an adaptive support assembly (2), characterized in that, The innermost layer of the tracheal assembly (1) is a ceramic tube (101), the outer periphery of which is covered by a thermal stress buffer layer (102), the outer periphery of which is covered by a metal support layer (104), the outer periphery of which is covered by a nano aerogel felt layer (103), the outer periphery of which is covered by a multiple GH3030 alloy helical springs arranged in an equidistant circular array on the outer periphery of the thermal stress buffer layer (102), the adaptive support assembly (2) includes four support seats (201) located at the bottom of the tracheal assembly (1), each support seat (201) is hinged to a hydraulic cylinder (203), the end of the hydraulic rod at the bottom of the hydraulic cylinder (203) is hinged to a support foot (204) via a pin (205), and each support foot (204) is embedded with a pressure sensor (4).

2. The high-rigidity, thermal shock resistant gas collecting pipe for waste heat recovery coke oven according to claim 1, characterized in that, The ceramic tube (101) is made of silicon carbide ceramic material.

3. The thermal shock resistant high-rigidity gas collecting pipe for waste heat recovery coke oven according to claim 1, characterized in that, The thermal stress buffer layer (102) is made of flexible graphite material.

4. The thermal shock resistant high-rigidity gas collecting pipe for waste heat recovery coke oven according to claim 1, characterized in that, Servo motors (202) are fixed to the side walls of the support base (201), and the output shafts of the servo motors (202) are connected to the hydraulic cylinders (203) along the hinge point between the support base (201) and the hydraulic cylinders (203).

5. The thermal shock resistant high-rigidity gas collecting pipe for waste heat recovery coke oven according to claim 4, characterized in that, The inner wall of the ceramic tube (101) is provided with multiple ultrasonic generators (3).

6. The thermal shock resistant high-rigidity gas collecting pipe for waste heat recovery coke oven according to claim 1, characterized in that, The pressure sensor (4) collects the contact pressure data between the support foot (204) and the ground in real time, and transmits the analog signal to the PLC control system through the shielded cable; the ultrasonic generator (3) on the inner wall of the ceramic tube (101) is connected to the external controller. The external controller sends start and stop signals to the ultrasonic generator (3) at regular intervals according to the preset periodic cleaning mode, so that the ultrasonic generator (3) generates high-frequency vibration at a working frequency of 20-40kHz to remove contaminants from the inner wall of the ceramic tube (101).

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