Calcium carbide furnace outlet waste heat recovery device

Abstract

The application discloses a calcium carbide furnace outlet waste heat recovery device, which comprises a grate cooling ring device sleeved outside a calcium carbide furnace, the grate cooling ring device is used for receiving liquid calcium carbide discharged from the calcium carbide furnace outlet and cooling, granulating and pushing forward the liquid calcium carbide, and a grate cooling discharge device is connected to the grate cooling ring device and used for discharging the granulated calcium carbide in the grate cooling ring device.

Description

Technical fields:

[0001] This invention relates to the field of waste heat recovery technology for calcium carbide furnaces, and more particularly to a waste heat recovery device for the outlet of a calcium carbide furnace. Background technology:

[0002] Calcium carbide was initially used for lighting and metal cutting and welding. With the advent of the process for producing calcium carbide ammonia, its applications were further expanded. Today, calcium carbide has even wider uses, becoming an important raw material for organic synthesis, steel desulfurization, and acetylene production. Especially in recent years, with the widespread application of acetylene in the chemical industry and the soaring international oil prices, calcium carbide-based acetylene has attracted considerable attention from the domestic and international chemical industries. For example, it is used as a basic raw material in the synthesis of polyvinyl chloride, as a raw material for the production of cyanide and urea, in the production of acetylene black, in steel desulfurization, as a catalyst, and in the production of non-ferrous metals, among other industries. Currently, my country has fully mastered the technology for large-scale, sealed calcium carbide production, where coke and calcium carbide are placed at 2200℃. Calcium carbide is smelted in an electric furnace to produce calcium carbide. After smelting, the calcium carbide is transferred from the furnace to a calcium carbide pot on a track trolley. The trolley is then pulled by a winch to a cooling workshop for cooling. The calcium carbide pot is then hoisted to the ground by an overhead crane to cool naturally. When the liquid calcium carbide forms a calcium carbide lump, the calcium carbide lump is demolded from the calcium carbide pot by an overhead crane. The empty calcium carbide pot is then hoisted back onto the track trolley by an overhead crane and used again for calcium carbide tapping. This process is repeated, and the entire process is complicated, involves many pieces of equipment, and has huge equipment and labor costs. The production efficiency is low. More importantly, the sensible heat of the calcium carbide in the calcium carbide pot is difficult to recover and reuse, resulting in a large heat loss. Moreover, the calcium carbide lump needs to be crushed by a crusher before it can be used for acetylene production, which increases the downstream production cost. Summary of the Invention:

[0003] The purpose of this invention is to provide a waste heat recovery device at the outlet of a calcium carbide furnace to solve the technical problems of difficulty in recovering and reusing waste heat during the calcium carbide tapping and cooling stages, as well as the numerous equipment, low production efficiency, and high production costs in the entire production process of calcium carbide cooling, demolding, and crushing.

[0004] The present invention relates to a waste heat recovery device for a calcium carbide furnace outlet, comprising a grate cooling ring device fitted outside the calcium carbide furnace. The grate cooling ring device receives liquid calcium carbide discharged from the calcium carbide furnace outlet and cools, granulates, and pushes the liquid calcium carbide forward. A grate cooling discharge device is connected to the grate cooling ring device for discharging the granulated calcium carbide from within the grate cooling ring device. Both the grate cooling ring device and the grate cooling discharge device are covered with a layer of calcium carbide blocks. Both the grate cooling ring device and the grate cooling discharge device are fixedly covered with a sealing cover plate. A waste heat recovery flue is connected to the sealing cover plate. A high-pressure blower is installed at the bottom of both the grate cooling ring device and the grate cooling discharge device.

[0005] Furthermore, there is a gap between the grate cooling ring device and the outer wall of the calcium carbide furnace, and the grate cooling ring device is connected to the calcium carbide furnace through a connecting column. The width of the gap is 10cm to 50cm.

[0006] Furthermore, the grate-type cooling ring device includes a cooling ring groove, in which a plurality of first fixed grate plates are fixedly installed. A first movable grate plate is provided between any two adjacent first fixed grate plates. The first movable grate plate is slidably connected to the inner wall of the cooling ring groove. The bottom surface of the first movable grate plate is slidably attached to the first fixed grate plate. The upper surface of the first movable grate plate is an inclined surface. The first movable grate plate is drivenly connected to a first driving device. The first driving device drives the first movable grate plate to reciprocate along the cooling ring groove.

[0007] Furthermore, the first driving device includes a driving ring, and a plurality of through slots are formed on the outer wall of the cooling ring groove. A sliding pin is installed on the first movable grate plate, the sliding pin is slidably connected to the through slots, the sliding pin is connected to the driving ring, the driving ring is slidably fitted outside the cooling ring groove, the driving ring is provided with meshing teeth, the meshing teeth mesh with half gears, the half gears are drivenly connected to the first motor, and a first compression spring is connected between the first fixed grate plate and the first movable grate plate.

[0008] Furthermore, ball bearings are provided between the drive ring and the cooling ring groove.

[0009] Furthermore, the sliding connection between the first movable grate plate and the cooling ring groove, the sliding connection between the first movable grate plate and the first fixed grate plate, and the sliding connection between the sliding pin and the through groove are all polished.

[0010] Furthermore, the grate-type cooling discharge device includes a cooling straight trough, in which a plurality of second fixed grates are fixedly installed. A second movable grates are provided between any two adjacent second fixed grates. The second movable grates are slidably connected to the inner wall of the cooling straight trough. The bottom surface of the second movable grates is slidably attached to the second fixed grates. The upper surface of the second movable grates is an inclined surface. The second fixed grates are driven by a second driving device, which drives the second movable grates to reciprocate linearly within the cooling straight trough.

[0011] Furthermore, the second drive device includes a camshaft and a connecting plate vertically mounted downwards at the bottom of the second movable grate. Any adjacent connecting plates are connected by a connecting rod. A spring plate is vertically connected downwards on the second fixed grate. A second compression spring is connected between the spring plate and the connecting plate. The working surface of the camshaft is in contact with the connecting plate. The camshaft is connected to a second electric motor for transmission.

[0012] Furthermore, the sliding connection between the second movable grate and the cooling straight groove, and the sliding connection between the second movable grate and the second fixed grate, are both polished.

[0013] Furthermore, corundum bricks are installed on the inner walls of the cooling ring groove and the cooling straight groove.

[0014] The beneficial effects of this invention are:

[0015] 1. This invention completely overturns the traditional design by designing a grate-type cooling ring device at the outlet of the calcium carbide furnace, which allows the liquid calcium carbide to be cooled in a concentrated manner within the cooling ring groove. This eliminates the need for traditional designs such as track trolleys, overhead cranes, calcium carbide pots, and cooling workshops, simplifying the process flow, significantly reducing equipment, and greatly lowering production costs.

[0016] 2. Liquid calcium carbide is cooled centrally in a cooling ring tank, making it easy to collect waste heat from the calcium carbide, thus truly realizing the recovery and reuse of waste heat from the calcium carbide and saving resources;

[0017] 3. The grate-type cooling ring device can cool liquid calcium carbide while granulating it, eliminating the demolding process and subsequent crushing process of calcium carbide products, greatly saving production costs and significantly improving the efficiency of raw tea production. Attached image description:

[0018] Figure 1 This is the front view of the present invention;

[0019] Figure 2 This is a top view of the present invention;

[0020] Figure 3 This is a perspective view of the present invention;

[0021] Figure 4 This is an internal cross-sectional perspective view of the three-dimensional diagram of the present invention;

[0022] Figure 5 for Figure 4 A magnified structural diagram of part A;

[0023] Figure 6 This is a perspective view of the cooling ring groove and cooling straight groove of the present invention;

[0024] Figure 7 This is a cross-sectional view of the grate-type cooling and discharging device of the present invention;

[0025] In the figure, 1 is a sealing cover plate, 2 is a high-pressure blower, 3 is a waste heat recovery flue, 4 is a first fixed grate plate, 5 is a first movable grate plate, 6 is a cooling ring groove, 7 is a cooling straight groove, 8 is a drive ring, 9 is a meshing tooth, 10 is a half gear, 11 is a first motor, 12 is a second motor, 13 is a second fixed grate plate, 14 is a second movable grate plate, 15 is a through groove, 16 is a connecting plate, 17 is a first compression spring, 18 is a sliding pin, 19 is a spring plate, 20 is a connecting rod, 21 is a camshaft, 23 is a second compression spring, 24 is a calcium carbide block material layer, 25 is a connecting column, and 26 is a calcium carbide furnace. Detailed implementation method:

[0026] Example 1

[0027] like Figure 1 and Figure 2 As shown, a waste heat recovery device for a calcium carbide furnace outlet includes a grate cooling ring device fitted around the calcium carbide furnace 26. The grate cooling ring device receives liquid calcium carbide discharged from the furnace outlet and cools, granulates, and pushes the liquid calcium carbide forward. A grate cooling discharge device is connected to the grate cooling ring device to discharge the granulated calcium carbide inside the grate cooling ring device. Calcium carbide block material layers 24 are laid on both the grate cooling ring device and the grate cooling discharge device. Sealing covers 1 are fixedly installed on both the grate cooling ring device and the grate cooling discharge device. A waste heat recovery flue 3 is connected to the sealing cover 1. High-pressure blowers 2 are installed at the bottom of both the grate cooling ring device and the grate cooling discharge device. The gas blown in by the high-pressure blowers 2 rapidly cools the liquid calcium carbide, and the heat exchanged gas is recovered and reused by the waste heat recovery flue 3.

[0028] like Figure 3 As shown, there is a gap between the grate cooling ring device and the outer wall of the calcium carbide furnace 26. The grate cooling ring device is connected to the calcium carbide furnace through the connecting column 25. The width of the gap is 10cm to 50cm. An appropriate gap can prevent the high-temperature calcium carbide from burning the grate cooling ring device.

[0029] like Figures 3 to 5 As shown, the grate-type cooling ring device includes a cooling ring groove 6, in which a plurality of first fixed grate plates 4 are fixedly installed. A first movable grate plate 5 is provided between any two adjacent first fixed grate plates 4. The first movable grate plate 5 is slidably connected to the inner wall of the cooling ring groove 6. The bottom surface of the first movable grate plate 5 is slidably attached to the first fixed grate plate 4. The upper surface of the first movable grate plate 5 is an inclined surface. The first movable grate plate 5 is drivenly connected to a first driving device. The first driving device drives the first movable grate plate 5 to reciprocate along the cooling ring groove 6.

[0030] The grate-type cooling discharge device includes a cooling straight trough 7, within which a plurality of second fixed grate plates 13 are fixedly installed. A second movable grate plate 14 is provided between any two adjacent second fixed grate plates 13. The second movable grate plate 14 is slidably connected to the inner wall of the cooling straight trough 7, with its bottom surface slidably fitted against the second fixed grate plate 13. The upper surface of the second movable grate plate 14 is inclined. The second fixed grate plate 13 is connected to the second driving device. The second drive device drives the second movable grate 14 to reciprocate linearly within the cooling straight groove 7. The first movable grate 5 with an inclined surface can push the material forward. Since the first movable grate 5 and the first fixed grate 4 are arranged alternately, the calcium carbide material will also undergo vertical displacement. Therefore, the calcium carbide naturally forms granules or blocks during the cooling process. The movement principle of the second fixed grate 13 and the second movable grate 14 is the same as that of the first movable grate 5 and the first fixed grate 4.

[0031] Example 2:

[0032] Based on Example 1, various driving structures can be selected to drive the first movable grate plate 5 and the second movable grate plate 14 to reciprocate. Preferably, the present invention selects a half-tooth gear transmission structure to realize the reciprocating motion of the first movable grate plate 5, the specific structure of which is as follows: Figures 4 to 6 As shown, the first driving device includes a driving ring 8. Several through slots 15 are formed on the outer wall of the cooling ring groove 6. A sliding pin 18 is installed on the first movable grate 5, and the sliding pin 18 is slidably connected to the through slots 15 and connected to the driving ring 8. The driving ring 8 is slidably fitted outside the cooling ring groove 6. The driving ring 8 is provided with meshing teeth 9, which mesh with a half gear 10. The half gear 10 is connected to a first motor 11. A first compression spring 17 is connected between the first fixed grate 4 and the first movable grate 5. Ball bearings are provided between the driving ring 8 and the cooling ring groove 6. The ball bearings can effectively reduce transmission friction and improve the service life of the equipment.

[0033] In practical use, when the meshing teeth 9 mesh with the half gear 10, the drive ring 8 drives the first movable grate 5 to move forward. When the meshing teeth 9 and the half gear 10 do not mesh, the first compression spring 17 pulls the first movable grate 5 back, thereby realizing the reciprocating motion of the first movable grate 5.

[0034] To ensure smooth equipment operation and minimize noise, the sliding connection points between the first movable grate plate 5 and the cooling ring groove 6, the first movable grate plate 5 and the first fixed grate plate 4, and the sliding connection points between the sliding pin 18 and the through groove 15 are all polished.

[0035] As a preferred structure, the present invention selects a cam structure to realize the reciprocating linear motion of the second movable grate 14, the specific structure of which is as follows: Figure 7 As shown, the second driving device includes a camshaft 21 and a connecting plate 16 vertically mounted downwards at the bottom of the second movable grate 14. Any adjacent connecting plates 16 are connected by a connecting rod 20. A spring plate 19 is vertically connected downwards on the second fixed grate 13. A second compression spring 23 is connected between the spring plate 19 and the connecting plate 16. The working surface of the camshaft 21 is in contact with the connecting plate 16. The camshaft 21 is connected to the second motor 12 for transmission. In specific use, the camshaft 21 rotates to drive the second movable grate 14 to achieve reciprocating linear motion.

[0036] To ensure smooth equipment operation and minimize noise, the sliding connection between the second movable grate plate 14 and the cooling straight groove 7, as well as the sliding connection between the second movable grate plate 14 and the second fixed grate plate 13, are all polished.

[0037] Because the inner walls of the cooling ring groove 6 and the cooling straight groove 7 are in direct contact with liquid calcium carbide, corundum bricks are installed on the inner walls of the cooling ring groove 6 and the cooling straight groove 7 to prevent them from being burned.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste heat recovery device for the outlet of a calcium carbide furnace, characterized in that: It includes a grate cooling ring device fitted outside the calcium carbide furnace (26), which is used to receive liquid calcium carbide discharged from the outlet of the calcium carbide furnace and cool, granulate and push the liquid calcium carbide forward. A grate cooling discharge device is connected to the grate cooling ring device, which is used to discharge the granulated calcium carbide in the grate cooling ring device. A layer of calcium carbide blocks (24) is laid on both the grate cooling ring device and the grate cooling discharge device. A sealing cover plate (1) is fixedly covered on both the grate cooling ring device and the grate cooling discharge device. A waste heat recovery flue (3) is connected to the sealing cover plate (1). High-pressure blowers (2) are installed at the bottom of each device; the grate-type cooling ring device includes a cooling ring groove (6), and several first fixed grate plates (4) are fixedly installed in the cooling ring groove (6). A first movable grate plate (5) is provided between any two adjacent first fixed grate plates (4). The first movable grate plate (5) is slidably connected to the inner wall of the cooling ring groove (6). The bottom surface of the first movable grate plate (5) is slidably attached to the first fixed grate plate (4). The upper surface of the first movable grate plate (5) is an inclined surface. The first movable grate plate (5) is connected to a first driving device. The first driving device drives the first movable grate plate (5) to reciprocate along the cooling ring groove (6).

2. The waste heat recovery device at the outlet of a calcium carbide furnace according to claim 1, characterized in that: There is a gap between the grate cooling ring device and the outer wall of the calcium carbide furnace (26). The grate cooling ring device is connected to the calcium carbide furnace through a connecting column (25). The width of the gap is 10cm to 50cm.

3. The waste heat recovery device at the outlet of a calcium carbide furnace according to claim 1, characterized in that: The first driving device includes a driving ring (8), and a plurality of through slots (15) are provided on the outer wall of the cooling ring groove (6). A sliding pin (18) is installed on the first movable grate plate (5). The sliding pin (18) is slidably connected to the through slot (15). The sliding pin (18) is connected to the driving ring (8). The driving ring (8) is slidably fitted outside the cooling ring groove (6). The driving ring (8) is provided with meshing teeth (9). The meshing teeth (9) mesh with half gears (10). The half gears (10) are connected to the first motor (11) for transmission. A first compression spring (17) is connected between the first fixed grate plate (4) and the first movable grate plate (5).

4. The waste heat recovery device at the outlet of a calcium carbide furnace according to claim 3, characterized in that: A ball bearing is provided between the drive ring (8) and the cooling ring groove (6).

5. The waste heat recovery device at the outlet of a calcium carbide furnace according to claim 4, characterized in that: Polishing is performed at the sliding connection between the first movable grate plate (5) and the cooling ring groove (6), the sliding connection between the first movable grate plate (5) and the first fixed grate plate (4), and the sliding connection between the sliding pin (18) and the through groove (15).

6. The waste heat recovery device at the outlet of a calcium carbide furnace according to claim 3, characterized in that: The grate-type cooling discharge device includes a cooling straight trough (7), in which several second fixed grate plates (13) are fixedly installed. A second movable grate plate (14) is provided between any two adjacent second fixed grate plates (13). The second movable grate plate (14) is slidably connected to the inner wall of the cooling straight trough (7). The bottom surface of the second movable grate plate (14) is slidably attached to the second fixed grate plate (13). The upper surface of the second movable grate plate (14) is an inclined surface. The second fixed grate plate (13) is connected to a second driving device. The second driving device drives the second movable grate plate (14) to reciprocate linearly in the cooling straight trough (7).

7. The waste heat recovery device at the outlet of a calcium carbide furnace according to claim 6, characterized in that: The second drive device includes a camshaft (21) and a connecting plate (16) mounted vertically downward at the bottom of the second movable grate (14). Any adjacent connecting plates (16) are connected by a connecting rod (20). A spring plate (19) is vertically connected downward on the second fixed grate (13). A second compression spring (23) is connected between the spring plate (19) and the connecting plate (16). The working surface of the camshaft (21) is in contact with the connecting plate (16). The camshaft (21) is connected to the second motor (12) for transmission.

8. The waste heat recovery device at the outlet of a calcium carbide furnace according to claim 6, characterized in that: The sliding connection between the second movable grate plate (14) and the cooling straight groove (7), and the sliding connection between the second movable grate plate (14) and the second fixed grate plate (13) are all polished.

9. A waste heat recovery device for a calcium carbide furnace outlet according to claim 6, characterized in that: Corundum bricks are installed on the inner walls of the cooling ring groove (6) and the cooling straight groove (7).

Images