A compensation device for sintering flue and dust collection pipe

Abstract

This invention relates to a compensation device for a sintering flue and dust settling pipe, comprising a flue, a flue compensator, a fixed support, a moving trolley, a dust settling pipe, and a dust settling pipe compensator. The dust settling pipes are respectively installed below each air box on the sintering machine. A fixed point is set below the sintering machine. All dust settling pipes are connected to the flue. The flue is divided into several sections, each connected by a flue compensator. Several moving trolleys are installed at the bottom of the flue between the compensators. A fixed support is installed at the bottom of the flue. A dust settling pipe compensator is installed in the middle of the upper part of the dust settling pipe. The beneficial effects of this invention are: compensating for all deformations of the flue and dust settling pipe caused by changes in the internal medium temperature, reducing the air leakage rate of the sintering system, reducing the main sintering load, saving energy, and reducing sintering production costs.

Description

Technical Field

[0001] This invention relates to the field of compensation technology for large flues and dust collection pipes, and particularly to a compensation device for sintered large flues and dust collection pipes. Background Technology

[0002] The sintering flue is a pipe made of carbon steel, composed of sections of different sizes depending on the flue gas flow rate. Located below and parallel to the sintering machine, it is connected to the sintering machine's air box via a carbon steel dust collection pipe. During sintering operation, the machine expands due to heat, and the high-temperature flue gas generated simultaneously enters the flue through the dust collection pipe, causing both the dust collection pipe and the flue to expand as well. When the sintering machine stops operating, the machine, dust collection pipe, and flue naturally cool and contract. Currently, expansion joints are installed in the sintering machine itself, compensators are installed between the air box and the dust collection pipe, and expansion joints are installed in the flue to absorb the deformation caused by thermal expansion and contraction, protecting the equipment and pipes from damage.

[0003] Existing thermal expansion and contraction compensation technologies for main flues and dust collection pipes have several shortcomings, including: 1) Expansion joints in main flues cannot fully absorb the deformation of the pipes, causing damage and air leakage: The size of the expansion joints in main flues is limited. When the temperature of the medium inside the main flue (high-temperature flue gas or normal-temperature air) changes, the deformation caused by thermal expansion or contraction exceeds the size of the expansion joint, resulting in damage and air leakage. This leads to a higher air leakage rate in the sintering system, increased main exhaust load in sintering, energy waste, and increased sintering production costs; 2) Expansion compensators cannot fully absorb the accumulated deformation, causing damage and air leakage: Expansion compensators are located between the sintering machine wind box and the dust collection pipe, and their size is limited, resulting in insufficient compensation. When the temperature of the medium (high-temperature flue gas or normal-temperature air) changes, the sintering machine, dust collection pipe, and main flue all deform due to thermal expansion or contraction. Both ends of the expansion compensator deform accordingly, and the compensation amount of the expansion compensator located at the bottom of the wind box is difficult to meet the accumulated deformation. 3) The sintering machine has only one fixed point, while the main flue has multiple fixed points. The main flue cannot compensate for the displacement deformation, causing the deformation direction of the two ends of the compensator to be opposite at certain positions. The cumulative deformation is even greater, exceeding the compensation capacity of the compensator, causing damage to the compensator. Ultimately, this leads to an increase in the air leakage rate of the sintering system, an increase in the load of the main sintering exhaust, energy waste, and an increase in sintering production costs. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a compensation device for sintering flue and dust settling pipe. By segmenting the flue, a flue compensator is installed between each segment, and a large-compensation dust settling pipe compensator is installed on the dust settling pipe. This device compensates for all deformations of the flue and dust settling pipe caused by changes in the internal medium temperature. As a result, the air leakage rate of the sintering system is reduced, the main sintering load is lowered, energy is saved, and sintering production costs are reduced.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A compensation device for a sintering flue and dust collection pipe includes a flue, a flue compensator, a fixed support, a moving trolley, a dust collection pipe, and a dust collection pipe compensator. The dust collection pipes are respectively installed below each air box on the sintering machine. A fixed point is set below the sintering machine. All dust collection pipes are connected to the flue. The flue is divided into several sections, and each section is connected by a flue compensator. Several moving trolleys are installed at the bottom of the flue between the flue compensators. A fixed support is set at the bottom of the flue. A dust collection pipe compensator is installed in the middle of the upper part of the dust collection pipe.

[0007] Furthermore, the large flue gas compensator is a bellows compensator.

[0008] Furthermore, the aforementioned large flue gas compensator adopts a flange sleeve compensator.

[0009] Furthermore, the dust collection pipe compensator is a corrugated pipe compensator.

[0010] Furthermore, the dust collection pipe compensator is a flange sleeve compensator.

[0011] Furthermore, the dust collection pipe compensator is a compensator with a large compensation capacity.

[0012] Furthermore, the horizontal position of the fixed bracket is the same as the horizontal position of the fixed point of the sintering machine.

[0013] Furthermore, the specific steps of the compensation method for the compensation device of the sintering flue and dust settling pipe are as follows:

[0014] S1. When the sintering machine is in operation, the high-temperature flue gas generated by sintering enters the dust collection pipe and the main flue through the air box under the sintering machine. The sintering machine, dust collection pipe and main flue are all heated and undergo thermal expansion. The sintering machine is equipped with expansion joints on both sides of the fixed point to eliminate the deformation caused by its own expansion. The main flue is set in sections, and a main flue compensator is set between each section. The main flue compensator has a large axial and radial compensation function and can absorb the deformation caused by the thermal expansion of the main flue. At the same time, the main flue compensator is equipped with a corrosion-resistant and wear-resistant coating or lining plate to ensure that the main flue compensator works normally and is not damaged when the flue gas passes through.

[0015] S2. A fixed support and multiple movable trolleys are installed below the main flue to ensure support for the main flue and the main flue compensator. The position of the fixed support is the same as the horizontal position of the fixed point of the sintering machine to ensure that the main flue and the sintering machine expand in the same direction when heated, resulting in deformation in the same direction.

[0016] S3. The mobile trolley consists of a support frame and moving wheels. The support frame is welded and fixed to the main flue. The moving wheels have axial and radial movement functions and can move freely to compensate for displacement deformation when the main flue compensator compensates for deformation.

[0017] S4. The upper end of the dust collection pipe is connected to the lower opening of the sintering machine's air box, and the lower end is connected to the upper part of the main flue, ensuring that the sintering flue gas enters the main flue from the sintering machine. A large-size dust collection pipe compensator with a large compensation capacity is installed in the middle and upper part of the dust collection pipe. It has a large axial and radial compensation function and can absorb the same-direction deformation caused by the thermal expansion of the main flue and the sintering machine. At the same time, the dust collection pipe compensator is equipped with a corrosion-resistant and wear-resistant coating or lining plate inside to ensure that the dust collection pipe compensator works normally and is not damaged when the flue gas passes through.

[0018] S5. When the sintering machine stops production, the sintering machine, dust collection pipe, and main flue will naturally cool and shrink in the ambient air. The resulting deformation will be absorbed by the expansion joint of the sintering machine body, the compensator of the sintering main flue, and the compensator of the dust collection pipe, respectively.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1) Multiple large flue compensators are installed in the large flue to completely absorb the deformation caused by thermal expansion and contraction, ensuring the integrity of the compensation device and reducing the air leakage rate of the sintering system: The fixed support and the mobile trolley serve as the large flue compensation device. When the large flue compensator is compensating for deformation, it can move freely to compensate for the displacement deformation, ensuring that all deformation caused by changes in the internal medium temperature (high temperature flue gas or normal temperature air) of the large flue is absorbed. This reduces the air leakage rate of the sintering system, lowers the load of the main sintering pump, saves energy, and reduces sintering production costs.

[0021] 2) The compensator below the wind box is removed, and a new large-size dust-falling pipe compensator with a large compensation capacity is added in the middle and upper part of the dust-falling pipe to increase the compensation capacity, meet the requirements of compensating for the accumulated deformation at various points, ensure that the dust-falling pipe compensator completely absorbs the accumulated deformation at various points, ensure the integrity of the compensation device, and reduce the air leakage rate of the sintering system.

[0022] 3) The original multiple fixed points of the main flue were eliminated, and only one fixed support was set up at the same horizontal position as the fixed point of the sintering machine. The positions of the main flue compensator and the moving trolley were reasonably arranged so that the deformation direction on both sides of the fixed point of the sintering machine and the main flue is the same. The two ends of the dust collection pipe compensation device are also subjected to deformation in the same direction, which reduces the cumulative deformation, ensures that the compensation device is not damaged, reduces the air leakage rate of the sintering system, reduces the load of the main sintering exhaust, saves energy, and reduces the sintering production cost. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the compensation device structure for a sintering flue and dust collection pipe according to the present invention.

[0024] In the diagram: 1. Main flue; 2. Main flue compensator; 3. Fixed bracket; 4. Mobile trolley; 5. Dust settling pipe; 6. Dust settling pipe compensator; 7. Sintering machine; 8. Wind box; 9. Fixed point; 10. Air; 11. Flue gas. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0026] like Figure 1 As shown, the working principle of a compensation device for a sintering flue and dust settling pipe is as follows: When sintering production or shutdown occurs, the sintering machine 7, dust settling pipe 5, and flue 1 undergo thermal expansion and contraction deformation due to changes in the internal medium temperature (high-temperature flue gas or normal-temperature air). By setting a flue compensator 2, a fixed bracket 3, and a moving trolley 4 on the flue 1 and arranging their positions appropriately, the deformation generated by the flue is completely absorbed. At the same time, the original compensator of the dust settling pipe 5 is removed, and a new large-size dust settling pipe compensator 6 is added to increase the compensation amount. Its position is adjusted from below the wind box 8 to the upper part of the dust settling pipe 5 to completely absorb the accumulated deformation from various places. This ensures that the main body of the flue 1 and dust settling pipe 5 and the corresponding compensation device are not damaged, the air leakage rate of the sintering system is reduced, the main sintering exhaust load is reduced, energy is saved, and sintering production costs are reduced.

[0027] [Example 1] As follows Figure 1 As shown, a compensation device for a sintering flue and dust collection pipe includes a flue 1, a flue compensator 2, a fixed support 3, a moving trolley 4, a dust collection pipe 5, and a dust collection pipe compensator 6. The dust collection pipes 5 are respectively installed below each air box 8 on the sintering machine 7. A fixed point 9 is set below the sintering machine 7. All dust collection pipes 5 are connected to the flue 1. The flue 1 is divided into several sections, and each section of the flue 1 is connected by a flue compensator 2. Several moving trolleys 4 are set at the bottom of the flue 1 between the flue compensators 2. A fixed support 3 is set at the bottom of the flue 1. The horizontal position of the fixed support 3 is the same as the horizontal position of the fixed point 9 of the sintering machine. A dust collection pipe compensator 6 is set in the middle of the upper part of the dust collection pipe 5. The flue compensator 2 is a corrugated pipe compensator, and the dust collection pipe compensator 6 is a large-size corrugated pipe compensator.

[0028] [Example 2] As shown Figure 1As shown, a compensation device for a sintering flue and dust collection pipe includes a flue 1, a flue compensator 2, a fixed support 3, a moving trolley 4, a dust collection pipe 5, and a dust collection pipe compensator 6. The dust collection pipes 5 are respectively installed below each air box 8 on the sintering machine 7. A fixed point 9 is set below the sintering machine 7. All dust collection pipes 5 are connected to the flue 1. The flue 1 is divided into several sections, and each section of the flue 1 is connected by a flue compensator 2. Several moving trolleys 4 are set at the bottom of the flue 1 between the flue compensators 2. A fixed support 3 is set at the bottom of the flue 1. The horizontal position of the fixed support 3 is the same as the horizontal position of the fixed point 9 of the sintering machine. A dust collection pipe compensator 6 is set in the middle of the upper part of the dust collection pipe 5. The flue compensator 2 is a corrugated pipe compensator, and the dust collection pipe compensator 6 is a large-size compensation flange sleeve compensator.

[0029] [Example 3] As shown Figure 1 As shown, a compensation device for a sintering flue and dust collection pipe includes a flue 1, a flue compensator 2, a fixed support 3, a moving trolley 4, a dust collection pipe 5, and a dust collection pipe compensator 6. The dust collection pipes 5 are respectively installed below each air box 8 on the sintering machine 7. A fixed point 9 is set below the sintering machine 7. All dust collection pipes 5 are connected to the flue 1. The flue 1 is divided into several sections, and each section of the flue 1 is connected by a flue compensator 2. Several moving trolleys 4 are set at the bottom of the flue 1 between the flue compensators 2. A fixed support 3 is set at the bottom of the flue 1. The horizontal position of the fixed support 3 is the same as the horizontal position of the fixed point 9 of the sintering machine. A dust collection pipe compensator 6 is set in the middle of the upper part of the dust collection pipe 5. The flue compensator 2 is a flange sleeve compensator, and the dust collection pipe compensator 6 is a large-size corrugated pipe compensator.

[0030] [Example 4] As follows Figure 1 As shown, a compensation device for a sintering flue and dust collection pipe includes a flue 1, a flue compensator 2, a fixed support 3, a moving trolley 4, a dust collection pipe 5, and a dust collection pipe compensator 6. The dust collection pipes 5 are respectively installed below each air box 8 on the sintering machine 7. A fixed point 9 is set below the sintering machine 7. All dust collection pipes 5 are connected to the flue 1. The flue 1 is divided into several sections, and each section of the flue 1 is connected by a flue compensator 2. Several moving trolleys 4 are set at the bottom of the flue between the flue compensators 2. A fixed support 3 is set at the bottom of the flue 1. The horizontal position of the fixed support 3 is the same as the horizontal position of the fixed point 9 of the sintering machine. A dust collection pipe compensator 6 is set in the middle of the upper part of the dust collection pipe 5. The flue compensator 2 is a flange sleeve compensator, and the dust collection pipe compensator 6 is a large-size compensation flange sleeve compensator.

[0031] The specific steps of the compensation method for the compensation devices of the sintering flue and dust settling pipe described in Examples 1-4 are as follows:

[0032] S1. When the sintering machine is in operation, the high-temperature flue gas 11 generated by sintering enters the dust collection pipe 5 and the interior of the main flue 1 through the air box 8 under the sintering machine 7. The sintering machine 7, the dust collection pipe 5, and the main flue 1 are all heated and undergo thermal expansion. The sintering machine 7 is provided with expansion joints on both sides of the fixed point 9, which can eliminate the deformation caused by its own expansion. The main flue 1 is set in sections, and a main flue compensator 2 is set between each section of the main flue 1. The main flue compensator 2 has a large axial and radial compensation function, which can absorb the deformation caused by the thermal expansion of the main flue 1. At the same time, the main flue compensator 2 is provided with a corrosion-resistant and wear-resistant coating or lining plate inside to ensure that the main flue compensator 2 works normally and is not damaged when the flue gas 11 passes through.

[0033] S2. A fixed support 3 and multiple moving trolleys 4 are installed below the main flue 1 to ensure the support of the main flue 1 and the main flue compensator 2. The position of the fixed support 3 is the same as the horizontal position of the fixed point 9 of the sintering machine 7, so as to ensure that the main flue 1 and the sintering machine 7 expand in the same direction when heated and expand, and generate the same deformation amount.

[0034] S3. The mobile trolley 4 consists of a support frame and moving wheels. The support frame is welded and fixed to the main flue 1. The moving wheels have axial and radial movement functions and can move freely to compensate for displacement deformation when the main flue compensator 2 compensates for deformation.

[0035] S4. The upper end of the dust collection pipe 5 is connected to the lower opening of the air box 8 of the sintering machine 7, and the lower end is connected to the upper part of the main flue 1, ensuring that the sintering flue gas 11 enters the main flue 1 from the sintering machine 7. A large-size dust collection pipe compensator 6 with a large compensation capacity is installed in the middle and upper part of the dust collection pipe 5. It has a large axial and radial compensation function and can absorb the same direction deformation caused by the thermal expansion of the main flue 1 and the sintering machine 7. At the same time, the dust collection pipe compensator 6 is equipped with a corrosion-resistant and wear-resistant coating or lining plate inside to ensure that the dust collection pipe compensator 6 works normally and is not damaged when the flue gas 1 passes through.

[0036] S5. When the sintering machine stops production, the sintering machine 7, dust collection pipe 5, and main flue 1 are naturally cooled in ambient air 10 and undergo cold shrinkage deformation. The resulting deformation is absorbed by the expansion joint of the sintering machine 1 body, the main flue compensator 2, and the dust collection pipe compensator 6, respectively.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A compensation device for a sintering flue and dust settling pipe, comprising a flue, a flue compensator, a fixed support, a moving trolley, dust settling pipes, and a dust settling pipe compensator, wherein the dust settling pipes are respectively installed below each air box on the sintering machine, a fixed point is provided below the sintering machine, and all dust settling pipes are connected to the flue, characterized in that, The main flue is divided into several sections, and each section is connected by a main flue compensator. Several mobile trolleys are installed at the bottom of the main flue between the main flue compensators. A fixed support is installed at the bottom of the main flue. A dust-suppressing pipe compensator is installed in the middle of the upper part of the dust-suppressing pipe.

2. The compensation device for a sintering flue and dust settling pipe according to claim 1, characterized in that, The large flue compensator mentioned above is a corrugated pipe compensator.

3. The compensation device for a sintering flue and dust settling pipe according to claim 1, characterized in that, The aforementioned large flue gas compensator adopts a flange sleeve compensator.

4. The compensation device for a sintering flue and dust settling pipe according to claim 1, characterized in that, The dust collection pipe compensator mentioned above is a corrugated pipe compensator.

5. The compensation device for a sintering flue and dust settling pipe according to claim 1, characterized in that, The dust collection pipe compensator mentioned above is a flange sleeve compensator.

6. A compensation device for a sintering flue and dust settling pipe according to claim 1, 4, or 5, characterized in that, The dust collection pipe compensator mentioned above is a compensator with a large compensation capacity.

7. The compensation device for a sintering flue and dust settling pipe according to claim 1, characterized in that, The horizontal position of the fixed bracket is the same as the horizontal position of the fixed point of the sintering machine.

8. The compensation method for the compensation device of a sintering flue and dust settling pipe according to claim 1, characterized in that, The specific steps of the compensation method for the compensation device of the sintering flue and dust settling pipe are as follows: S1. When the sintering machine is in operation, the high-temperature flue gas generated by sintering enters the dust collection pipe and the main flue through the air box under the sintering machine. The sintering machine, dust collection pipe and main flue are all heated and undergo thermal expansion. The sintering machine is equipped with expansion joints on both sides of the fixed point to eliminate the deformation caused by its own expansion. The main flue is set in sections, and a main flue compensator is set between each section. The main flue compensator has a large axial and radial compensation function and can absorb the deformation caused by the thermal expansion of the main flue. At the same time, the main flue compensator is equipped with a corrosion-resistant and wear-resistant coating or lining plate to ensure that the main flue compensator works normally and is not damaged when the flue gas passes through. S2. A fixed support and multiple mobile trolleys are installed below the main flue to ensure the support of the main flue and the main flue compensator. The position of the fixed support is the same as the horizontal position of the fixed point of the sintering machine to ensure that the main flue and the sintering machine expand in the same direction when heated and expand, and generate the same deformation amount. S3. The mobile trolley consists of a support frame and moving wheels. The support frame is welded and fixed to the main flue. The moving wheels have axial and radial movement functions and can move freely to compensate for displacement deformation when the main flue compensator compensates for deformation. S4. The upper end of the dust collection pipe is connected to the lower opening of the sintering machine's air box, and the lower end is connected to the upper part of the main flue, ensuring that the sintering flue gas enters the main flue from the sintering machine. A large-size dust collection pipe compensator with a large compensation capacity is installed in the middle and upper part of the dust collection pipe. It has a large axial and radial compensation function and can absorb the same-direction deformation caused by the thermal expansion of the main flue and the sintering machine. At the same time, the dust collection pipe compensator is equipped with a corrosion-resistant and wear-resistant coating or lining plate inside to ensure that the dust collection pipe compensator works normally and is not damaged when the flue gas passes through. S5. When the sintering machine stops production, the sintering machine, dust collection pipe, and main flue will naturally cool and shrink in the ambient air. The resulting deformation will be absorbed by the expansion joint of the sintering machine body, the compensator of the sintering main flue, and the compensator of the dust collection pipe, respectively.

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