A furnace rock wool production furnace body rising amount control device and method

Abstract

The application relates to a furnace rock wool production furnace body rising amount control device and method, wherein a control method comprises the following steps: 1) before furnace body temperature rising, a plurality of tension springs are arranged along the height direction outside the furnace body; 2) during furnace body temperature rising, when the furnace body rising amount is too large, the number of the arranged tension springs is increased; in steps 1) and 2), the arranged tension springs are pre-tightened. Through the arrangement of the tension springs outside the furnace body, the expansion of the furnace body can be inhibited by the spring tension force, the control of the furnace body rising amount is facilitated, and the number of power-off times can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of electric furnace rock wool production technology, specifically relating to a device and method for controlling the rise of the furnace body in electric furnace rock wool production. Background Technology

[0002] Rock wool is a new type of green insulation material widely used for building exterior wall insulation. It is prepared by melting raw materials into magma and then molding it. Currently, magma melting is done using an electric furnace. The furnace structure includes a furnace bottom, furnace body, and furnace cover. The furnace cover, fixed to the floor, is used to hold graphite electrodes. When the graphite electrodes are energized, they generate an electric arc to heat the raw materials inside the furnace. During magma melting, the furnace body expands along its height, causing it to rise.

[0003] Due to the inherent rise of the furnace body, a sufficiently large safety gap needs to be maintained between the furnace body and the furnace cover in the cold state. This gap affects the sealing and insulation effect between the furnace body and the furnace cover, increasing heat loss, especially in the later stages of heating when the furnace body temperature reaches 1500℃, resulting in significant heat loss. Under ideal process conditions, if the rise of the furnace body can be precisely controlled, the gap between the furnace body and the furnace cover will decrease during the later stages of heating, thus reducing this heat loss. However, in reality, the operating conditions fluctuate significantly in each heating cycle, making it difficult to control the rate and amount of furnace body rise.

[0004] In addition, the rise of the furnace body must be strictly controlled within a safe range. If the rise is too large and exceeds the reserved gap, the furnace body will impact the furnace cover and damage it. The current operating method is to control the rise of the furnace body by cutting off the power to control the heating rate when the rise is found to be too large. However, too many power outages will seriously affect production efficiency. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a device and method for controlling the rise of the furnace body in electric furnace rock wool production. The specific solution is as follows:

[0006] A method for controlling the rise of the furnace body in electric arc furnace rock wool production includes the following steps:

[0007] 1) Before the furnace body is heated, several tension springs are installed on the outside of the furnace body along the height direction;

[0008] 2) During the furnace heating process, if the furnace body rises too much, increase the number of tension springs.

[0009] In steps 1) and 2), the tension spring is pre-tightened.

[0010] Furthermore, determine the total number of tension springs used in one heating cycle of the furnace body; before the furnace body is heated, the number of tension springs set is 2 / 3 of the total number.

[0011] Furthermore, a tension spring is installed on a spring tensioning device, which includes a top plate and a bottom plate. The top plate is used to connect to the top of the furnace body, and the bottom plate is used to connect to the bottom of the furnace body. A pull plate is provided between the top plate and the bottom plate, and the pull plate is connected to the bottom plate by a suspension wire. The tension spring is connected between the pull plate and the top plate. An adjusting nut is provided at the bottom of the suspension wire, and the adjusting nut is used to adjust the preload of the tension spring.

[0012] As an improvement to the present invention, the present invention further provides a furnace body rise control device for electric furnace rock wool production, including a top plate, a bottom plate, and a tension spring. The top plate is used to connect to the top of the furnace body, and the bottom plate is used to connect to the bottom of the furnace body. A pull plate is provided between the top plate and the bottom plate, and the pull plate is connected to the bottom plate by a suspension wire. An adjusting nut is provided at the lower part of the suspension wire. The tension spring is connected between the pull plate and the top plate. The pull plate includes a main pull plate and a secondary pull plate. The secondary pull plate is hinged to the upper part of the main pull plate. The tension spring includes a main spring and a secondary spring. The main spring is connected between the main pull plate and the top plate, and the secondary spring is connected between the secondary pull plate and the top plate. A support plate is provided at one end of the main pull plate, and a jack is provided between the support plate and the secondary pull plate.

[0013] Furthermore, the secondary pull plate is equipped with a locking nut for connecting with the main pull plate.

[0014] Furthermore, the number of main springs is twice the number of auxiliary springs.

[0015] Based on the improved furnace body rise control device of this invention, this invention provides another method for controlling the furnace body rise in electric arc furnace rock wool production, which includes the following steps:

[0016] 1) Before the furnace body is heated, fix the top plate and bottom plate to the furnace body, loosen the locking nut of the auxiliary pull plate, and apply preload to the tension spring by tightening the adjusting nut;

[0017] 2) During the furnace body heating process, when the furnace body rises to 3 / 4 of the set rise, start the jack to push the auxiliary pull plate to rotate and pre-tighten the auxiliary spring. When the auxiliary pull plate is pushed into place, use the lock nut to fix the auxiliary pull plate and the main pull plate in place.

[0018] This invention utilizes tension springs installed on the exterior of the furnace body to suppress furnace expansion through spring tension, thus facilitating control of furnace expansion and reducing the frequency of power outages. Furthermore, the improved technology employs a partial installation of tension springs before heating, with additional springs added later in the heating process based on the actual expansion. This enhances the accuracy of furnace expansion control, ensuring the expansion remains within a safe range while simultaneously improving the seal between the furnace body and the furnace lid, reducing heat loss. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the spring tensioning device in Example 1.

[0020] Figure 2 This is a schematic diagram of the furnace body rise control device in Example 2.

[0021] Figure 3 This is a top view of the pull plate in Example 2. Detailed Implementation

[0022] The present invention will now be clearly described in conjunction with specific embodiments. This description is merely illustrative and is not intended to limit the scope of the invention. Any modifications, equivalent substitutions, or improvements made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the scope of protection of the present invention.

[0023] Example

[0024] Example 1

[0025] A method for controlling the rise of the furnace body in electric arc furnace rock wool production includes the following steps:

[0026] 1) Before the furnace body is heated, several tension springs are installed on the outside of the furnace body along the height direction;

[0027] 2) During the furnace heating process, if the furnace body rises too much, increase the number of tension springs.

[0028] In steps 1) and 2), the tension springs are pre-tightened. In step 1), the total number of tension springs used in one heating cycle of the furnace body is determined based on experience; before the furnace body is heated, the number of tension springs set is 2 / 3 of the total number.

[0029] like Figure 1 As shown, a spring tensioning device for controlling the rise of the furnace body is used in this embodiment to install a tensioning spring. Its structure includes a top plate 1 and a bottom plate 2. The top plate 1 is used to connect to the top of the furnace body, and the bottom plate is used to connect to the bottom of the furnace body. A pull plate 3 is provided between the top plate and the bottom plate. The pull plate and the bottom plate are connected by a suspension wire 4. The tensioning spring 5 is connected between the pull plate and the top plate. An adjusting nut 6 is provided at the lower part of the suspension wire. The adjusting nut is used to adjust the preload of the tensioning spring.

[0030] Several fixed seats 7 are provided around the outer perimeter of the side wall of the furnace body, and the top plate and bottom plate can be connected to the fixed seats by bolts.

[0031] Taking a furnace body with a diameter of Φ4m as an example, the initial preload of each tension spring is 1.5 to 2T. Based on experience, a total of 30 tension springs are set up, which can control the rise of the furnace body within 20cm.

[0032] Before the improvement, all tension springs were installed before the furnace body was heated, and then power was applied. Before reaching 1000℃, the furnace body rose less than 10cm, resulting in a gap of about 20cm between the furnace body and the lid, leading to significant heat loss. After the improvement, 20 tension springs are installed and pre-tensioned before heating. When the temperature reaches 1000℃, the rise reaches 15cm, and the gap between the furnace body and lid is approximately 15cm. The remaining 10 tension springs are then installed and pre-tensioned, controlling the total rise to no more than 20cm. After the improvement, the power consumption per heating cycle can be reduced by 5-8%.

[0033] Example 2

[0034] During the later stages of heating, as the furnace body rises, the preload force required for installing the tension springs needs to be significantly increased. Applying this preload force by tightening the adjusting nut is difficult and inefficient. This embodiment provides a furnace body rise control device for electric furnace rock wool production, which facilitates the later addition of tension springs. Figure 2 and Figure 3 Its structure includes a top plate 1, a bottom plate 2, and tension springs. The top plate is used to connect to the top of the furnace body, and the bottom plate is used to connect to the bottom of the furnace body. A pull plate is provided between the top plate and the bottom plate, and the pull plate and the bottom plate are connected by a lifting wire 4. An adjusting nut 6 is provided at the lower part of the lifting wire. The tension spring is connected between the pull plate and the top plate. The pull plate 3 includes a main pull plate 3a and a secondary pull plate 3b. The secondary pull plate is hinged to the upper part of the main pull plate. The tension spring includes a main spring 5a and a secondary spring 5b. The main spring is connected between the main pull plate and the top plate, and the secondary spring is connected between the secondary pull plate and the top plate. A support plate 8 is provided at one end of the main pull plate, and a jack 9 is provided between the support plate and the secondary pull plate. The secondary pull plate is provided with a locking nut 10 for connecting with the main pull plate. The number of main springs is twice the number of secondary springs. For example, each device is equipped with 4 main springs and 2 secondary springs.

[0035] The device in this embodiment includes the following steps during installation:

[0036] 1) Before the furnace body is heated, fix the top plate and bottom plate to the furnace body, loosen the locking nut of the auxiliary pull plate, and apply preload to the tension spring by tightening the adjusting nut;

[0037] 2) During the furnace body heating process, when the furnace body rises to 3 / 4 of the set rise, if the total rise is controlled within 20cm, when the rise reaches 15cm, start the jack to push the auxiliary pull plate to rotate and pre-tighten the auxiliary spring. When the auxiliary pull plate is pushed into place, use the lock nut to fix the auxiliary pull plate and the main pull plate in place.

Claims

1. A device for controlling the rise of an electric arc furnace rock wool production furnace body, comprising a top plate, a bottom plate, and a tension spring, wherein the top plate is connected to the top of the furnace body, the bottom plate is connected to the bottom of the furnace body, a pull plate is provided between the top plate and the bottom plate, the pull plate and the bottom plate are connected by a suspension wire, an adjusting nut is provided at the lower part of the suspension wire, and the tension spring is connected between the pull plate and the top plate, characterized in that: The pull plate includes a main pull plate and a secondary pull plate. The secondary pull plate is hinged to the upper part of the main pull plate. The tension spring includes a main spring and a secondary spring. The main spring is connected between the main pull plate and the top plate, and the secondary spring is connected between the secondary pull plate and the top plate. A support plate is provided at one end of the main pull plate, and a jack is provided between the support plate and the secondary pull plate. The secondary pull plate is provided with a locking nut for connecting with the main pull plate.

2. The electric furnace rock wool production furnace body rise control device according to claim 1, characterized in that: The number of main springs is twice the number of auxiliary springs.

3. A method for controlling the rise of the furnace body in electric furnace rock wool production, characterized in that, The electric furnace rock wool production furnace body rise control device as described in claim 2 is adopted, and includes the following steps: 1) Before the furnace body is heated, fix the top plate to the top of the furnace body and fix the bottom plate to the bottom of the furnace body. Loosen the locking nut of the auxiliary pull plate and apply preload to the main spring by tightening the adjusting nut. 2) During the furnace body heating process, when the furnace body rises to 3 / 4 of the set rise, start the jack to push the auxiliary pull plate to rotate and pre-tighten the auxiliary spring. When the auxiliary pull plate is pushed into place, use the lock nut to fix the auxiliary pull plate and the main pull plate in place.

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