A safety pressure relief valve for preventing coal dust from floating on a bunker top

Abstract

The utility model discloses a kind of silo roof anti-dust safety relief valve, belong to pressure relief valve technical field, in the exhaust end connection filtering mechanism of pressure relief mechanism, the filtering mechanism is equipped with multistage filtering unit, dust collecting bin for collecting dust and with silo intercommunication's dust valve, the valve body is opened with by the pressure relief valve core control opening and closing's pressure relief passage, the inlet end of the filtering mechanism and the outlet end of the pressure relief passage are combined by fixedly connected mode, the filtering mechanism further includes a pulse backflush valve, the pulse backflush valve is arranged above the PTFE membrane filter bag, for dust cleaning to the PTFE membrane filter bag.The utility model solves the problem that existing pressure relief valve directly discharges dust-containing gas and causes pollution and material waste, with safe pressure relief and environmental protection dust removal integration, recyclable material, can real-time monitoring operating state, with the beneficial effect of high safety controllability.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief valve technology, and in particular to a safety pressure relief valve for preventing ash from rising from the top of a silo. Background Technology

[0002] Silos are widely used for storing powdery or granular materials such as cement, fly ash, and grain. During their daily operation, the air pressure inside the silo often fluctuates due to the loading and unloading of materials, temperature changes, or chemical reactions. When the internal pressure rises abnormally and exceeds the safe range that the silo structure can withstand, there is a risk of silo deformation or even physical explosion, posing a serious safety hazard.

[0003] To prevent such accidents, existing technology installs safety relief valves on the top of silos. These traditional safety relief valves automatically open when the internal pressure reaches a preset threshold, releasing high-pressure gas and thus protecting the silo structure. However, since the materials stored in silos are mostly powders, the high-speed gas released during the pressure relief process inevitably carries a large amount of material dust into the atmosphere. This not only directly causes the loss of valuable materials and reduces economic efficiency, but more seriously, it releases a large amount of dust pollutants into the surrounding environment, damaging air quality and failing to meet increasingly stringent environmental regulations. The design of existing pressure relief valves only solves the pressure safety problem, but ignores the ensuing environmental protection and material recovery issues.

[0004] Therefore, this utility model proposes a safety pressure relief valve for preventing ash from escaping from the top of a silo to overcome the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems in the existing technology, a silo top safety pressure relief valve directly discharges dust-containing gas into the atmosphere during pressure relief, which not only wastes materials but also pollutes the environment and has a relatively simple function, this utility model aims to provide a silo top anti-dust safety pressure relief valve with an improved structure that can effectively solve the above problems.

[0006] This utility model provides a safety pressure relief valve for preventing ash from rising from a silo top, comprising: a valve body, a pressure relief valve core slidably disposed within the valve body, and a pressure regulating spring; and a filter mechanism.

[0007] The filtration mechanism includes a dust collection chamber for collecting dust, and the bottom of the dust collection chamber is equipped with a ash discharge valve that communicates with the silo.

[0008] Furthermore, the valve body is provided with a pressure relief channel that is controlled to open and close by the pressure relief valve core, and the inlet end of the filter mechanism and the outlet end of the pressure relief channel are combined by a fixed connection.

[0009] Preferably, the filtration mechanism is provided with multi-stage filtration units.

[0010] Furthermore, the multi-stage filtration unit includes, from the inside out, a metal filter screen, a PTFE-coated filter bag, and an activated carbon adsorption layer along the airflow direction.

[0011] Preferably, the filtration mechanism further includes a pulse backflush valve, which is disposed above the PTFE membrane filter bag and is used to clean the PTFE membrane filter bag.

[0012] Preferably, the dust collection chamber has a funnel-shaped structure.

[0013] Preferably, the pressure relief mechanism further includes a pressure sensor located on the inner wall of the pressure relief channel for monitoring the air pressure inside the silo.

[0014] Preferably, the pressure relief mechanism further includes a limit switch, which is positioned to detect the displacement of the top end of the pressure relief valve core.

[0015] Preferably, the pressure relief mechanism further includes a manual adjustment rod connected to the pressure regulating spring for adjusting the pressure relief threshold of the pressure regulating spring.

[0016] This utility model has the following beneficial effects: 1. This utility model solves the problem of direct emission of dust-laden gas into the atmosphere when the pressure relief valve is activated, which causes serious dust pollution and material waste, by setting a filter mechanism at the exhaust end of the pressure relief mechanism. The filter mechanism is equipped with a filter unit, a dust collection bin and an ash discharge valve connected to the silo. This achieves the beneficial effect of integrating safe pressure relief and environmental dust removal, and can also recover materials and avoid waste.

[0017] 2. This utility model solves the problem of unclear working status and inability to be remotely monitored by adding a pressure sensor and limit switch to the pressure relief mechanism. It achieves the technical effect of real-time monitoring of the pressure inside the chamber and the opening and closing status of the valve, thereby improving the safety and controllability of the equipment operation.

[0018] 3. This utility model, by adopting a multi-stage filtration unit consisting of a metal filter screen, a membrane filter bag, and an activated carbon adsorption layer, and in conjunction with a pulse backflush valve for automatic dust removal, solves the problems of low efficiency, easy clogging, and inconvenient maintenance of a single filtration method, and achieves the beneficial effects of thorough filtration and purification, stable and reliable operation, and high degree of automation. Attached Figure Description

[0019] Figure 1 This is a perspective view of the front side of the silo for a silo top anti-ash safety pressure relief valve proposed in this utility model.

[0020] Legend: 1. Silo; 2. Pressure relief mechanism; 201. Valve body; 202. Pressure relief valve core; 203. Pressure regulating spring; 204. Limit switch; 205. Manual adjustment rod; 206. Pressure sensor; 207. Pressure relief channel; 3. Filtration mechanism; 301. Metal filter screen; 302. PTFE membrane filter bag; 303. Activated carbon adsorption layer; 304. Pulse backflush valve; 305. Dust collection bin; 306. Ash discharge valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0022] Example: Please refer to Figure 1 This utility model provides a silo top dust-proof safety pressure relief valve, which aims to solve the problem of pollution and material waste caused by the direct discharge of dust-containing gas during pressure relief in the prior art.

[0023] like Figure 1 As shown, the silo top anti-ash-out safety pressure relief valve includes a pressure relief mechanism 2 and a valve body 201 fixedly connected below the pressure relief mechanism 2. The pressure relief mechanism 2 is used to release gas when the pressure inside the silo 1 rises abnormally, while the valve body 201 serves as the basic structure of the pressure relief mechanism 2 and also provides a connection interface with the silo 1.

[0024] To solve the above-mentioned technical problems, the technical solution of this embodiment is that a silo top anti-ash safety pressure relief valve further includes a filter mechanism 3, and the filter mechanism 3 and the aforementioned pressure relief mechanism 2 form a specific structural cooperation and connection relationship.

[0025] Please refer to the following carefully. Figure 1 The structure will be described in detail below: The inlet end of the filter mechanism 3 is fixedly connected to the outlet end of the pressure relief channel 207 of the pressure relief mechanism 2. The filter mechanism 3 is equipped with a multi-stage filter unit. The multi-stage filter unit includes a metal filter screen 301, a PTFE membrane filter bag 302 and an activated carbon adsorption layer 303 in sequence from the inside to the outside along the direction of airflow. A dust collection bin 305 for collecting dust is also fixedly connected below the multi-stage filter unit. The dust collection bin 305 is preferably funnel-shaped to facilitate the collection of dust. A dust discharge valve 306 is installed at the bottom outlet of the dust collection bin 305. The outlet of the dust discharge valve 306 is connected to the inside of the silo 1.

[0026] Meanwhile, a pulse backflush valve 304 is installed inside the filtration mechanism 3, above the PTFE membrane filter bag 302, for cleaning the PTFE membrane filter bag 302. This integrated structure, which combines multi-stage filtration, pulse cleaning, and dust return, ensures that the high-pressure dust-laden gas released from the silo 1 is efficiently purified before emission, and the intercepted dust can be automatically collected and returned to the silo 1, achieving zero pollution and zero material loss during the safe pressure relief process.

[0027] Based on the above embodiments, the present invention may further include the following preferred technical solutions: As a preferred embodiment, in order to achieve efficient interception of dust and gas purification in exhaust gas, please refer to... Figure 1 The filter mechanism 3 is equipped with a multi-stage filtration unit, which is the filtration structure of this utility model. Further, the multi-stage filtration unit includes, from the inside to the outside, a metal filter screen 301, a PTFE membrane filter bag 302 and an activated carbon adsorption layer 303 along the direction of airflow. The metal filter screen 301 is used to initially intercept larger dust particles, the PTFE membrane filter bag 302 is used to efficiently filter fine dust, and the activated carbon adsorption layer 303 is used to adsorb odors or harmful gas components in the gas, ensuring that the discharged gas is clean and unpolluted.

[0028] As another preferred embodiment, in order to ensure that the filter unit can operate efficiently for a long time and realize automatic dust recovery, the filter mechanism 3 also includes a pulse backflush valve 304. The pulse backflush valve 304 is disposed above the clean air side of the PTFE membrane filter bag 302 and is used to spray high-pressure airflow onto the PTFE membrane filter bag 302 at a set cycle or according to the differential pressure signal, so that the dust attached to the surface of the filter bag falls off to the dust collection chamber 305 below.

[0029] As another preferred embodiment, for convenient centralized collection and smooth return of dust, please refer to... Figure 1The dust collection chamber 305 is designed as a funnel-shaped structure, with its bottom opening connected to the inlet end of the ash discharge valve 306. This shape design allows the dust to naturally gather and be guided to the ash discharge valve 306 by gravity.

[0030] As another preferred embodiment, in order to monitor the pressure state inside the silo 1 in real time and provide feedback signals to the control system, the pressure relief mechanism 2 also includes a pressure sensor 206, which is disposed on the lower inner wall of the pressure relief channel 207 and can accurately sense changes in the air pressure inside the silo.

[0031] In another preferred embodiment, in order to accurately detect the operating state of the pressure relief valve core 202 and feed it back to the external control system, the pressure relief mechanism 2 also includes a limit switch 204. The limit switch 204 is located above the top of the pressure relief valve core 202. When the pressure relief valve core 202 moves upward to a preset position, the limit switch 204 is triggered, indicating that the pressure relief channel 207 has been opened.

[0032] As a specific implementation method, in order to facilitate manual adjustment of the pressure threshold for pressure relief according to the actual working conditions, the pressure relief mechanism 2 also includes a manual adjustment rod 205. The manual adjustment rod 205 is connected to the upper end of the pressure regulating spring 203. The pre-compression amount of the pressure regulating spring 203 can be changed by the manual adjustment rod 205, thereby setting different pressure relief starting pressures.

[0033] Working principle: Pressure is relieved through pressure relief mechanism 2. When the air pressure in silo 1 exceeds the threshold, the airflow pushes the pressure relief valve core 202 to move inside the valve body 201 and compress the pressure regulating spring 203, opening the pressure relief channel 207 to achieve air release and pressure relief. The manual adjustment rod 205 is used to adjust the pressure relief threshold of the pressure regulating spring 203. The limit switch 204 is located at the top of the pressure relief valve core 202 to detect whether the pressure relief valve core 202 is activated and whether the pressure relief channel 207 is in a connected state, and feeds back to the external control system. The pressure sensor 206 is located on the inner wall of the lower end of the pressure relief channel 207 to monitor the air pressure in the silo in real time and feeds back to the external control system, thereby achieving accurate pressure control. The exhaust gas is filtered by the filtration mechanism 3, which consists of a metal filter screen 301, a PTFE membrane filter bag 302, and an activated carbon adsorption layer 303 from the inside out. This three-layer structure works together to intercept dust in the depressurized airflow. The dust collection chamber 305 is funnel-shaped and fixed below the multi-stage filtration unit, connected to the depressurization channel 207. It collects the dust intercepted by the filtration unit. When clogged, the pulse backflush valve 304 is activated to blow the dust adhering to the filter bag surface into the dust collection chamber 305. A ash discharge valve 306 is located at the bottom of the dust collection chamber 305 and connects to the inside of the chamber. It automatically opens after cleaning, returning the collected dust to the silo 1 to avoid material waste.

Claims

1. A silo top dust-proof safety pressure relief valve, installed on the top of a silo (1), comprising a pressure relief mechanism (2), the pressure relief mechanism (2) comprising a valve body (201), a pressure relief valve core (202) slidably disposed within the valve body (201), and a pressure regulating spring (203) for keeping the pressure relief valve core (202) in a closed state, wherein the valve body (201) is provided with a pressure relief channel (207) controlled by the pressure relief valve core (202), characterized in that... ； The silo top anti-dust safety pressure relief valve also includes a filter mechanism (3). The inlet end of the filter mechanism (3) is fixedly connected to the outlet end of the pressure relief channel (207). The filter mechanism (3) is provided with a dust collection bin (305) for collecting dust. The bottom of the dust collection bin (305) is provided with a dust discharge valve (306) that communicates with the silo (1).

2. The silo top anti-ash-out safety pressure relief valve according to claim 1, characterized in that, The filtration mechanism (3) is equipped with a multi-stage filtration unit.

3. The silo top anti-ash-out safety pressure relief valve according to claim 2, characterized in that, The multi-stage filtration unit includes, from the inside to the outside along the airflow direction, a metal filter screen (301), a PTFE membrane filter bag (302), and an activated carbon adsorption layer (303).

4. A silo top anti-ash-out safety pressure relief valve according to claim 3, characterized in that, The filtration mechanism (3) also includes a pulse backflush valve (304), which is located above the PTFE membrane filter bag (302) and is used to clean the PTFE membrane filter bag (302).

5. A silo top anti-ash-out safety pressure relief valve according to claim 1, characterized in that, The dust collection chamber (305) has a funnel-shaped structure.

6. A silo top anti-ash-out safety pressure relief valve according to claim 1, characterized in that, The pressure relief mechanism (2) also includes a pressure sensor (206), which is located on the inner wall of the pressure relief channel (207) and is used to monitor the air pressure inside the silo (1).

7. A silo top anti-ash-out safety pressure relief valve according to claim 1, characterized in that, The pressure relief mechanism (2) also includes a limit switch (204), which is positioned to detect the displacement of the top of the pressure relief valve core (202).

8. A silo top anti-ash-out safety pressure relief valve according to claim 1, characterized in that, The pressure relief mechanism (2) also includes a manual adjustment rod (205), which is connected to the pressure regulating spring (203) and is used to adjust the pressure relief threshold of the pressure regulating spring (203).

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