A vertical annealing furnace waste heat recovery device for high-efficiency preheating of strip steel

Abstract

The utility model provides a vertical annealing furnace waste heat recovery device for strip steel high -efficient preheating relates to waste heat utilization technical field, including heat exchange storehouse, the top middle integral of heat exchange storehouse is provided with the air outlet pipe, the top of air outlet pipe is sealed with pressure sensor and temperature sensor, and the pipeline connection with solenoid valve A is provided to the outside of air outlet pipe, three groups of solenoid valve B are connected to the three branch roads between air outlet pipe and solenoid valve A, and the other end of solenoid valve A is provided with pipeline connection to the upper side of cooler, the other side below of cooler is provided with pipeline connection to the bottom of one side of heat exchange storehouse, and the branch connection with solenoid valve C is arranged in this pipeline, can switch between the two modes of basic water circulation and power output through the combination control of solenoid valve A and three groups of solenoid valve B, this not only realizes the step -by -step utilization to waste heat, converts the high temperature flue gas originally used for preheating into the mechanical energy that can drive generator, improves the flexibility and efficiency of energy recovery.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat utilization technology, and more specifically, it relates to a waste heat recovery device for a vertical annealing furnace used for efficient preheating of strip steel. Background Technology

[0002] The vertical annealing furnace for high-efficiency preheating of strip steel is the core equipment on the hot-dip galvanizing production line. It is mainly used to preheat, heat, homogenize, and cool strip steel to achieve recrystallization annealing and improve its mechanical properties. The flue gas after completing the heating task still has a high temperature of 400-600°C and is drawn out from the tail of the furnace to recover the waste heat for utilization.

[0003] Based on the above, the current preheating method mainly uses heating to create a steam engine-like structure for driving. The driving structure and direction are fixed, making it inconvenient to have multiple sets of selectable control adjustments and to circulate and reuse water to generate power. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a waste heat recovery device for a vertical annealing furnace used for efficient preheating of strip steel. This solves the problem mentioned in the background art that the existing preheating utilization methods mainly rely on heating to manufacture a steam engine-like structure for driving, with a fixed driving structure and direction, making it inconvenient to have multiple sets of selectable control adjustments and to circulate and reuse water to generate power.

[0005] The purpose and effectiveness of this utility model, a waste heat recovery device for a vertical annealing furnace used for efficient preheating of strip steel, are achieved by the following specific technical means: A waste heat recovery device for a vertical annealing furnace used for efficient preheating of strip steel includes a heat exchange chamber. An outlet pipe is integrally installed at the top center of the heat exchange chamber. A pressure sensor and a temperature sensor are sealed at the top of the outlet pipe. A pipe connects to a solenoid valve A. Three branches connect the outlet pipe and solenoid valve A to three sets of solenoid valves B. A pipe connects the other end of solenoid valve A to the upper side of a cooler. A pipe connects to the bottom of one side of the heat exchange chamber from the lower side of the cooler, with a branch connecting to a solenoid valve C. The heat exchange chamber has a cylindrical structure, with fins integrally arranged around its outer wall. An actuator is also included, with pipes on both sides connecting to the lower part of the solenoid valves B and the upper part of the cooler, respectively.

[0006] Furthermore, a one-way valve for water replenishment is connected and installed on one side of the cooler.

[0007] Furthermore, the top of the cooler is threaded with a threaded plug for venting.

[0008] Furthermore, a power shaft is rotatably mounted in the middle of the driver and a shaft seal is fixedly mounted on the outside of the power shaft, with the impeller located inside the driver; a fan is fixedly mounted on one end of the power shaft near the cooler.

[0009] Furthermore, the side of the cooler away from the driver has a grid-like groove structure; the side of the cooler closer to the driver has three circular through slots, and the fan is located in the circular through slots.

[0010] Furthermore, proximity sensors are fixedly installed on the side of the driver closest to the cooler; a trigger wheel is fixedly installed outside the power shaft, and a protruding structure is integrally installed outside the trigger wheel. The protruding structure can trigger the proximity sensors to count during rotation.

[0011] Compared with the prior art, the present invention has the following beneficial effects: By combining solenoid valve A and three sets of solenoid valves B, the system can flexibly switch between basic water circulation and power output modes. This not only enables the cascade utilization of waste heat, converting the high-temperature flue gas originally used for preheating into mechanical energy that can drive the generator, but also allows for the selection of some or all of the drives to work according to actual needs, thus improving the flexibility and efficiency of energy recovery.

[0012] With its compact structure, high integration, and excellent self-cooling effect, the device cleverly integrates the driver, cooler, and fan together. Each driver's power shaft directly drives a built-in fan, which faces the heat dissipation slot of the cooler, forming a highly efficient forced air cooling. This integrated design not only saves space and reduces external power requirements, but also ensures that the cooler is always maintained at a highly efficient condensation temperature, thereby guaranteeing the thermal efficiency of the entire circulation system.

[0013] Stable operation, safe and reliable, easy to maintain, and equipped with a complete monitoring and protection mechanism; core parameters can be monitored through pressure and temperature sensors; the speed of the power shaft is accurately fed back through proximity sensors and trigger wheel, which facilitates condition assessment and fault diagnosis. At the same time, the one-way valve realizes water replenishment, the threaded plug can be used for pressure leveling, and the solenoid valve C has the dual functions of water discharge during shutdown and emergency pressure relief, which significantly improves the operational stability, safety and convenience of daily maintenance of the equipment. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the axonal structure of this utility model.

[0016] Figure 3 This is a three-dimensional sectional view of the present invention.

[0017] Figure 4 This is a side view structural diagram of the present invention.

[0018] Figure 5 This is a utility model Figure 2 A magnified schematic diagram of the structure at point A in the diagram.

[0019] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Heat exchange chamber; 101. Air outlet pipe; 2. Solenoid valve A; 3. Solenoid valve B; 4. Cooler; 401. Check valve; 402. Threaded plug; 5. Actuator; 501. Power shaft; 502. Impeller; 503. Fan; 504. Proximity sensor; 505. Trigger wheel; 6. Solenoid valve C. Detailed Implementation

[0020] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0021] Example 1: As attached Figure 1 To be continued Figure 5 As shown: This utility model provides a waste heat recovery device for a vertical annealing furnace for efficient preheating of strip steel, including a heat exchange chamber 1. An exhaust pipe 101 is integrally installed in the middle of the top of the heat exchange chamber 1. A pressure sensor and a temperature sensor are sealed on the top of the exhaust pipe 101. A pipe is installed outside the exhaust pipe 101 and connected to a solenoid valve A2. Three branches are set between the exhaust pipe 101 and the solenoid valve A2 and connected to three sets of solenoid valves B3. The other end of the solenoid valve A2 is connected to the upper side of a cooler 4. A pipe is set below the other side of the cooler 4 and connected to the bottom of one side of the heat exchange chamber 1. A branch of this pipe is connected to a solenoid valve C6. The heat exchange chamber 1 is a cylindrical structure, and fins are integrally arranged around the outer wall of the cylindrical structure. An actuator 5 is installed on both sides of the actuator 5 and connected to the lower part of the solenoid valve B3 and the upper part of the cooler 4, respectively.

[0022] A one-way valve 401 for water replenishment is connected and installed on one side of the cooler 4.

[0023] The top of the cooler 4 is threaded with a threaded plug 402 for venting.

[0024] The driver 5 has a power shaft 501 rotatably mounted in the middle of the shaft seal, and an impeller 502 is fixedly mounted on the outside of the power shaft 501. The impeller 502 is located inside the driver 5. A fan 503 is fixedly mounted on one end of the power shaft 501 near the cooler 4.

[0025] The cooler 4 has a grid-like groove structure on the side away from the driver 5; the cooler 4 has three circular slots on the side closer to the driver 5, and the fan 503 is located in the circular slots.

[0026] Among them, a proximity sensor 504 is fixedly installed on the side of the driver 5 near the cooler 4; a trigger wheel 505 is fixedly installed on the outside of the power shaft 501, and a protruding structure is integrally provided on the outside of the trigger wheel 505. The protruding structure can trigger the proximity sensor 504 to count during rotation.

[0027] The heat exchange chamber 1 is connected to the flue of the annealing furnace. The preheating of the flue continuously heats the heat exchange chamber 1, and the heat is transferred to the water in the chamber, so that the water reaches the conditions for evaporation and continuously generates steam. Open solenoid valve A2 beforehand to ensure unobstructed steam flow; Steam generated in heat exchange chamber 1 is ejected from outlet pipe 101 and enters cooler 4 via solenoid valve A2; Steam circulates and condenses into liquid water in cooler 4, and finally flows back to heat exchange chamber 1 to complete the basic water circulation. Power mode switching operation Close solenoid valve A2 and open solenoid valve B3 to change the steam flow path and allow steam to enter the power generation stage. Steam drive and power output Steam enters the driver 5 through solenoid valve B3, impacting the internal impeller 502 to rotate; Impeller 502 drives power shaft 501 to rotate synchronously, providing power; By pre-connecting the power shaft 501 to a generator or other shaft drive equipment, waste heat power recovery and utilization can be achieved. During the rotation of the power shaft 501, the coaxially connected fan 503 rotates accordingly, generating airflow to quickly cool the cooler 4, ensuring the condensation effect of the cooler 4 and maintaining the system's heat exchange efficiency. When the impeller 502 rotates, it synchronously drives the trigger wheel 505 to rotate; the trigger wheel 505 cooperates with the proximity sensor 504 to monitor the speed of the impeller 502 (and the power shaft 501) in real time, which facilitates the monitoring of the system's operating status. Automatic water replenishment function Check valve 401 is connected to an external water source; when the water volume in the system decreases, the water source can be replenished through check valve 401 to maintain a stable water level.

[0028] Pressure leveling operation Opening the threaded plug 402 on the equipment can release excess pressure in the system or balance the internal and external air pressure, preventing abnormal pressure from affecting the operation of the equipment. Example 2: Shutdown water drain function When the equipment needs to be shut down for maintenance, opening solenoid valve C6 can drain the water accumulated in heat exchange chamber 1 and pipelines, facilitating subsequent maintenance. Solenoid valve C6 can be used as an explosion-proof valve: when abnormal high pressure or water vapor mixture accumulates in the system, opening solenoid valve C6 can quickly release the water vapor mixture and reduce safety risks. Solenoid valve C6 needs to be pre-connected to a water tank or similar container for recycling to ensure that the discharged water (or water vapor mixture) is collected and to avoid waste or environmental pollution.

[0029] The specific usage and function of this embodiment are as follows: In this invention, during use, the heat exchange chamber 1 is connected to the chimney of the annealing furnace, and preheating is used to continuously heat the heat exchange chamber 1; after the heat exchange chamber 1 is heated, the water inside is heated to the point of evaporation, and evaporation continues. The evaporated water is sprayed out from the steam outlet pipe 101; the solenoid valve A2 is opened in advance so that the steam can pass through the solenoid valve A2 and enter the cooler 4, circulate and condense into water and then flow back to the heat exchange chamber 1 to complete the cycle. When using preheating to generate power, close solenoid valve A2 and open solenoid valve B3. Steam passes through solenoid valve B3 and driver 5 and returns to heat exchange chamber 1 to complete the cycle. During this period, the steam drives impeller 502 to rotate, which in turn drives power shaft 501 to rotate and provide power. By pre-connecting power shaft 501 to generator or other shaft drive equipment, waste heat can be utilized. During the rotation of the power shaft 501, the fan 503 rotates, generating a heat dissipation effect, which enables the cooler 4 to cool down quickly and ensure the condensation effect; When the impeller 502 rotates, the trigger wheel 505 rotates synchronously, which, together with the proximity sensor 504, can be used to monitor the rotation speed. The one-way valve 401 is connected to a water source. When the water volume decreases, it can be replenished through the one-way valve 401. For example, a water pump can be used to input pure water through the one-way valve 401 into the water circuit. During this process, the pressure can be leveled by opening the threaded plug 402. Solenoid valve C6 can be opened to release water during shutdown maintenance or as an explosion-proof valve to discharge water vapor mixtures; solenoid valve C6 is pre-connected to a water tank or similar container for recycling.

Claims

1. A waste heat recovery device for a vertical annealing furnace used for efficient preheating of strip steel, comprising: A heat exchange chamber (1) is provided with an integrated air outlet pipe (101) at the top center. A pressure sensor and a temperature sensor are sealed at the top of the air outlet pipe (101). A pipe is provided outside the air outlet pipe (101) and connected to a solenoid valve A (2). The air outlet pipe (101) and the solenoid valve A (2) are provided with three branches connected to three sets of solenoid valves B (3). The other end of the solenoid valve A (2) is provided with a pipe connected to the upper side of a cooler (4). The other side of the cooler (4) is provided with a pipe connected to the bottom side of a heat exchange chamber (1). A branch is provided in the pipe and connected to a solenoid valve C (6). The heat exchange chamber (1) is a cylindrical structure. The outer wall of the cylindrical structure is integrally surrounded by fins. The driver (5) has pipes on its upper sides connected to the lower part of the solenoid valve B (3) and the upper part of the cooler (4).

2. The waste heat recovery device for a vertical annealing furnace for high-efficiency preheating of strip steel as described in claim 1, characterized in that: A one-way valve (401) for water replenishment is connected to the lower side of one side of the cooler (4).

3. The waste heat recovery device for a vertical annealing furnace for high-efficiency preheating of strip steel as described in claim 1, characterized in that: The top of the cooler (4) is threaded with a threaded plug (402) for venting.

4. The waste heat recovery device for a vertical annealing furnace for high-efficiency preheating of strip steel as described in claim 1, characterized in that: The driver (5) has a power shaft (501) rotatably mounted on the middle of the shaft seal. An impeller (502) is fixedly mounted on the outside of the power shaft (501) and is located inside the driver (5). A fan (503) is fixedly mounted on one end of the power shaft (501) near the cooler (4).

5. The waste heat recovery device for a vertical annealing furnace for high-efficiency preheating of strip steel as described in claim 1, characterized in that: The cooler (4) has a grid-like groove structure on the side away from the driver (5); the cooler (4) has three circular slots on the side near the driver (5), and the fan (503) is located in the circular slot.

6. The waste heat recovery device for a vertical annealing furnace for high-efficiency preheating of strip steel as described in claim 1, characterized in that: The driver (5) is fixedly equipped with a proximity sensor (504) on the side near the cooler (4); a trigger wheel (505) is fixedly installed on the outside of the power shaft (501), and a protrusion structure is integrally provided on the outside of the trigger wheel (505). The protrusion structure can trigger the proximity sensor (504) to count during rotation.

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