A sealing explosion-proof device for a scraper conveyor for ash conveying in a smelting waste heat boiler

Abstract

This utility model discloses a sealing and explosion-proof device for a scraper conveyor for ash conveying in a smelting waste heat boiler. The device includes a scraper conveyor body, whose inlet is connected to the outlet of the waste heat boiler ash hopper via a rigid direct connection structure. Two sets of explosion vents are symmetrically distributed on the top of the waste heat boiler ash hopper. The rigid direct connection structure includes a flange with an annular groove on its edge. A high-temperature resistant sealing gasket is embedded in the annular groove. A pressure-sensing interlocking device is installed at each explosion vent. This utility model features a scientifically designed and rationally constructed structure with multiple tightly fitted sealing components, completely solving the problem of easy breakage and air leakage in flexible connections, and greatly improving the equipment's sealing performance. The pressure-sensing interlocking device detects pressure changes, triggering a relevant mechanism that causes the rupture disc to break, rapidly opening the quick-opening explosion-proof door and quickly releasing the pressure impact, ensuring production continuity and safety, and reducing economic losses caused by unplanned shutdowns.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment technology, and in particular to a sealing explosion-proof device for a scraper conveyor for ash conveying in a smelting waste heat boiler. Background Technology

[0002] In the field of metallurgical equipment, the ash conveying scraper of a smelting waste heat boiler plays a crucial role in transporting ash from the boiler. Currently, the smelting waste heat boiler and the ash conveying scraper mostly use a flexible connection, which has several drawbacks. First, the flexible connection is constantly exposed to high-temperature, corrosive flue gas, making it highly susceptible to corrosion and damage, leading to air leakage. This not only reduces the thermal efficiency of the waste heat boiler but also interferes with normal combustion conditions in the furnace, increasing energy consumption and pollutant emissions. Second, when fluctuations in the smelting furnace's operating conditions generate instantaneous positive pressure impacts, the flexible connection cannot withstand the pressure and is prone to rupture, causing high-temperature flue gas and dust leaks. This threatens the safety of on-site operators and may even trigger unplanned shutdowns, interrupting production and causing significant economic losses. Third, the original carbon steel casing has poor corrosion resistance and is rapidly damaged in high-temperature, highly corrosive environments, requiring frequent repairs and replacements, resulting in high maintenance costs and severely impacting the company's economic benefits and production efficiency. Therefore, we propose a sealing and explosion-proof device for the ash conveying scraper of a smelting waste heat boiler. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a sealing and explosion-proof device for the ash conveying scraper conveyor of a smelting waste heat boiler. This utility model solves the problems mentioned in the background section.

[0004] This utility model provides the following technical solution: a sealing explosion-proof device for a scraper conveyor for ash conveying in a smelting waste heat boiler, comprising a scraper conveyor body, wherein the feed inlet of the scraper conveyor body is connected to the discharge outlet of the waste heat boiler ash hopper through a rigid direct connection structure, wherein two sets of explosion relief ports are symmetrically distributed on the top of the waste heat boiler ash hopper, wherein the rigid direct connection structure includes a flange, and the edge of the flange is provided with an annular groove, wherein a high-temperature resistant sealing gasket is embedded in the annular groove, wherein a pressure sensing interlocking device is provided at the explosion relief port, and a quick-opening explosion-proof door is provided on the outside of the explosion relief port.

[0005] In the above scheme, the outer shell of the scraper conveyor body is a stainless steel shell, and the thickness of the stainless steel shell is ≥8mm.

[0006] In the above scheme, the inner surface of the scraper conveyor body is coated with a ceramic coating.

[0007] In the above scheme, the flange surface is provided with a graphite spiral wound sealing gasket.

[0008] In the above scheme, the quick-opening explosion-proof door is connected and cooperated through a hinge and a latch structure.

[0009] In the above scheme, the explosion vent area is ≥0.2m².

[0010] In the above scheme, a scraper drive shaft is provided inside the scraper conveyor body, and the surface of the scraper drive shaft is coated with a tungsten carbide wear-resistant layer.

[0011] The advantages and beneficial effects of this utility model are as follows: This utility model provides a sealing explosion-proof device for a scraper conveyor for ash conveying in a smelting waste heat boiler. It features an annular groove on the edge of a flange with a rigid direct connection structure, incorporating a high-temperature resistant sealing gasket. Simultaneously, a graphite spiral wound sealing gasket is provided on the flange surface. This multi-layered sealing structure tightly cooperates to completely solve the problem of easy damage and air leakage in flexible connections, greatly improving the equipment's sealing performance, effectively reducing energy waste and production interruptions caused by air leakage, and extending the equipment's continuous operation cycle. Two sets of explosion vents are symmetrically distributed at the top of the waste heat boiler ash hopper, in conjunction with a pressure-sensing interlocking device at the explosion vent and a quick-opening explosion-proof door on the outside. When the system pressure exceeds the set value, the pressure sensor interlock device detects the pressure change and triggers the relevant mechanism. The rupture disc breaks, and the quick-opening explosion-proof door opens rapidly, quickly releasing the pressure shock, ensuring production continuity and safety, and reducing economic losses caused by unplanned shutdowns. The scraper conveyor body is made of stainless steel with a ceramic coating on the inner surface. The dual corrosion-resistant design extends the corrosion resistance life of the scraper conveyor body. At the same time, the scraper drive shaft is coated with a tungsten carbide wear-resistant layer, effectively reducing wear. Attached Figure Description

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram: 1. Scraper conveyor body; 2. Feed inlet; 3. Rigid direct connection mechanism; 4. Waste heat boiler ash hopper; 5. Discharge outlet; 6. Explosion relief port; 7. Annular groove; 8. High temperature resistant sealing gasket; 9. Pressure sensor interlock device; 10. Quick-opening explosion-proof door; 11. Flange. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0017] like Figure 1-2 As shown, this utility model is a sealing and explosion-proof device for a scraper conveyor for ash conveying in a smelting waste heat boiler. It includes a scraper conveyor body 1, whose inlet 2 is connected to the outlet 5 of the waste heat boiler ash hopper 4 via a rigid direct connection structure 3. This rigid direct connection structure 3 replaces the traditional easily damaged flexible connection, avoiding system air leakage caused by soft connection damage and improving the equipment's sealing performance. The rigid direct connection structure 3 includes a flange 11, with an annular groove 7 on its edge. A high-temperature resistant sealing gasket 8 is embedded in the annular groove 7. The cooperation between the annular groove 7 and the high-temperature resistant sealing gasket 8 further enhances the sealing performance of the rigid connection, enabling the connection to maintain a stable sealing effect for a long time in high-temperature and high-dust environments, thus solving the problem of sealing failure and improving the continuous operation cycle of the equipment. Two sets of explosion vents 6 are symmetrically distributed on the top of the waste heat boiler ash hopper 4. A pressure sensing interlocking device 9 is installed at each explosion vent 6, and a quick-opening explosion-proof door 10 is installed on the outside of each explosion vent 6. When the operating conditions of the smelting furnace fluctuate and generate instantaneous positive pressure impact, the pressure sensing interlock device 9 monitors the pressure change at the explosion relief port 6 in real time. When the pressure reaches the set value, the rupture disc breaks, and the quick-opening explosion-proof door 10 opens rapidly to release the pressure quickly, avoiding the connection structure from being broken due to excessive pressure, preventing unplanned furnace shutdown accidents, ensuring production safety and continuity, and correspondingly solving the problem of prominent safety hazards.

[0018] In the above solution, the outer shell of the scraper conveyor body 1 is made of stainless steel, and the thickness of the stainless steel shell is ≥8mm. Stainless steel has good corrosion resistance, and the thicker shell further enhances its structural strength and corrosion resistance, effectively coping with high temperature and high corrosive working environments, extending the service life of the scraper conveyor body 1, reducing maintenance costs, and correspondingly solving the problems of poor corrosion resistance and high maintenance costs of the original shell.

[0019] In the above scheme, the inner surface of the scraper conveyor body 1 is coated with a ceramic coating. The ceramic coating has the characteristics of high temperature resistance, corrosion resistance and wear resistance. Combined with the stainless steel shell, it further enhances the resistance of the scraper conveyor body 1 to high temperature, high dust and corrosive substances, protects the internal structure of the shell, extends the overall service life of the equipment, reduces the frequency of maintenance, and correspondingly improves the corrosion resistance of the equipment.

[0020] In the above scheme, the surface of the flange 11 is provided with a graphite spiral wound gasket. The graphite spiral wound gasket has good high temperature resistance, corrosion resistance and sealing performance. It cooperates with the high temperature resistant gasket 8 in the annular groove 7 to form a double sealing structure, which further improves the sealing effect of the rigid direct connection structure 3, ensures that the system will not leak during operation, and correspondingly enhances the sealing performance of the equipment.

[0021] In the above scheme, the quick-opening explosion-proof door 10 is connected and coordinated through a hinge and latch structure. This special connection structure allows the quick-opening explosion-proof door 10 to be securely closed by the latch under normal working conditions, ensuring the equipment's airtightness; when an explosion occurs, under pressure, the hinge engages to allow the explosion-proof door to open quickly, providing a channel for pressure release without being damaged by pressure impact, ensuring the smooth progress of the explosion release process, and correspondingly enhancing the equipment's explosion-proof capability.

[0022] In the above scheme, the explosion vent 6 has an explosion vent area of ​​≥0.2m². Sufficient explosion vent area ensures that pressure can be released quickly and effectively when the system pressure is too high, avoiding the inability to release pressure in time due to insufficient explosion vent area, thereby ensuring the safety of equipment and personnel and correspondingly improving the explosion-proof performance of the equipment.

[0023] In the above scheme, a scraper drive shaft is provided inside the scraper conveyor body 1, and the surface of the scraper drive shaft is coated with a tungsten carbide wear-resistant layer. Tungsten carbide has extremely high hardness and wear resistance. When sprayed on the surface of the scraper drive shaft, it can effectively reduce the wear of the drive shaft during operation, improve the service life and reliability of the drive shaft, reduce the maintenance and replacement costs required due to drive shaft wear, and correspondingly extend the service life of the drive shaft and reduce equipment maintenance costs.

[0024] Working principle:

[0025] In this type of sealing and explosion-proof device for the ash conveying scraper conveyor of a smelting waste heat boiler, the rigid direct connection structure 3 plays a crucial sealing role during equipment operation. The flange 11 securely connects the feed inlet 2 of the scraper conveyor body 1 to the discharge outlet 5 of the waste heat boiler ash hopper 4 via welding or high-strength bolts. A high-temperature resistant sealing gasket 8 is embedded in the annular groove 7 on the edge of the flange 11. During flange connection, the sealing gasket is compressed, filling the tiny gaps between the flanges. Simultaneously, the graphite spiral wound sealing gasket on the surface of the flange 11 further enhances the sealing effect. This double-sealing structure effectively prevents high-temperature corrosive flue gas from leaking from the connection point, achieving efficient sealing of the system and avoiding the impact of air leakage on the thermal efficiency and combustion conditions of the waste heat boiler.

[0026] When the operating conditions of the smelting furnace fluctuate and the pressure inside the system increases, the symmetrically distributed explosion vents 6 at the top of the waste heat boiler ash hopper 4 begin to function. The pressure sensing interlock device 9 at the explosion vent 6 monitors the pressure changes in real time. When the pressure reaches the set explosion vent pressure of 0.15-0.25MPa, the pressure sensing interlock device 9 triggers a signal, and the aluminum rupture disc breaks. At this time, the quick-opening explosion-proof door 10 opens rapidly under the action of internal pressure through a special hinge and locking structure. The explosion vent 6 provides an explosion vent area of ​​≥0.2m², allowing the high-pressure gas and dust in the system to be discharged quickly, releasing the pressure shock, preventing excessive pressure from damaging the equipment, avoiding unplanned furnace shutdown accidents, and ensuring the safe and stable operation of the entire system.

[0027] The main body of the scraper conveyor 1 is made of stainless steel with a thickness of ≥8mm, which has excellent corrosion resistance and can withstand the erosion of high-temperature and highly corrosive flue gas. Meanwhile, the ceramic coating on the inner surface of the shell further enhances its resistance to corrosive substances and reduces internal corrosion. The tungsten carbide wear-resistant layer sprayed on the surface of the scraper drive shaft, with its extremely high hardness and wear resistance, effectively reduces friction and wear between the scraper drive shaft and materials such as ash during operation, extends the service life of the drive shaft, reduces the frequency of equipment maintenance and replacement, and lowers the company's production costs.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing and explosion-proof device for a scraper conveyor for ash conveying in a smelting waste heat boiler, comprising a scraper conveyor body (1), characterized in that: The feed inlet (2) of the scraper conveyor body (1) is connected to the discharge outlet (5) of the waste heat boiler ash hopper (4) through a rigid direct connection structure (3). Two sets of explosion relief ports (6) are symmetrically distributed on the top of the waste heat boiler ash hopper (4). The rigid direct connection structure (3) includes a flange (11), and the edge of the flange (11) is provided with an annular groove (7). A high-temperature resistant sealing gasket (8) is embedded in the annular groove (7). A pressure sensing interlocking device (9) is provided at the explosion relief port (6). A quick-opening explosion-proof door (10) is provided on the outside of the explosion relief port (6).

2. The sealing explosion-proof device for the ash conveying scraper conveyor of a smelting waste heat boiler according to claim 1, characterized in that: The outer shell of the scraper conveyor body (1) is a stainless steel shell, and the thickness of the stainless steel shell is ≥8mm.

3. The sealing explosion-proof device for the ash conveying scraper conveyor of a smelting waste heat boiler according to claim 1, characterized in that: The inner surface of the scraper body (1) is coated with a ceramic coating.

4. The sealing explosion-proof device for the ash conveying scraper conveyor of a smelting waste heat boiler according to claim 1, characterized in that: The flange (11) is provided with a graphite spiral wound gasket.

5. The sealing explosion-proof device for the ash conveying scraper conveyor of a smelting waste heat boiler according to claim 1, characterized in that: The quick-opening explosion-proof door (10) is connected and coordinated by hinges and a latch structure.

6. The sealing explosion-proof device for the ash conveying scraper conveyor of a smelting waste heat boiler according to claim 1, characterized in that, The explosion vent (6) has an explosion vent area of ​​≥0.2m².

7. The sealing explosion-proof device for the ash conveying scraper conveyor of a smelting waste heat boiler according to claim 1, characterized in that: The scraper conveyor body (1) is provided with a scraper drive shaft, and the surface of the scraper drive shaft is coated with a tungsten carbide wear-resistant layer.

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