Coal chemical powder material cleaning and recycling system

Abstract

The utility model relates to a coal chemical industry powder material cleaning recovery system belongs to coal chemical industry environmental protection technical field, including accident pulverized coal storage tank filter, accident pulverized coal storage tank filter is connected with negative pressure dust removal module, explosion -proof filter module, nitrogen regeneration module and near zero emission module, negative pressure dust removal module, explosion -proof filter module, nitrogen regeneration module and near zero emission module are independent of each other, the negative pressure dust removal module includes vacuum cleaning fan and distributed cleaning network. The utility model is used to solve the technical problem of low dust capture efficiency of the existing dust removal system.

Description

Technical Field

[0001] This utility model belongs to the field of coal chemical environmental protection technology, and specifically relates to a coal chemical powder material cleaning and recycling system. Background Technology

[0002] As a core area of ​​energy conversion, the coal chemical industry's powder material handling system undertakes key links such as coal crushing, conveying, and storage. Currently, the industry exhibits the following characteristics: 1) Large-scale production: Large-scale coal chemical projects have single-line processing capacities reaching thousands of tons. For example, the SE-Dongfang furnace gasification technology has achieved industrial application with a daily coal input of 1500 tons, resulting in a huge flow rate of powder materials. 2) Complex processes: Typical processes include coal grinding and drying, pressurized coal conveying, gasification reaction, and syngas washing, involving multiphase flow control and energy recovery.

[0003] The current powder material handling system in the coal chemical industry has the following technical defects: 1) Severe dust pollution: Traditional open sweeping results in PM2.5 concentration in the work area > 50 mg / m³. 3 It far exceeds the limit of ≤20mg / m³ in the "Integrated Emission Standard for Air Pollutants" (GB16297-1996). 3 1) Dust inhalation causes occupational diseases and endangers personnel health. 2) Significant safety hazards: Static electricity accumulation of coal dust can cause combustion and explosion accidents (minimum ignition energy <30mJ), with an industry accident rate as high as 0.8 times / 10,000 tons in recent years. 3) Significant resource waste: Due to impurities, the reuse rate of coal dust from accidents is less than 60%, resulting in annual losses exceeding 10,000 tons. 4) Difficult-to-control secondary pollution: Wet cleaning generates coal-containing wastewater (COD >2000mg / L), with treatment costs as high as 150 yuan / ton.

[0004] Chinese patent CN118594170A discloses a multi-scenario intelligent adaptive dust removal system. The system includes an air collection unit, a cyclone dust collector, a filter bag dust collection unit, an exhaust gas emission unit, a recovery unit, and a central control unit. The central control unit controls the air volume, negative pressure, and filtration area in real time. It uses retractable filter bags and high-efficiency filters, combined with a pulse backflushing module and a vibrating air cannon, to achieve dynamic adaptation and automated control. However, the system is a centralized air collection unit that relies on electric valves to control airflow, resulting in low dust collection efficiency. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a coal chemical powder material cleaning and recycling system to solve the technical problem of low dust collection efficiency in existing dust removal systems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a coal chemical powder material cleaning and recycling system, including an emergency pulverized coal storage tank filter. The emergency pulverized coal storage tank filter is connected to a negative pressure dust removal module, an explosion-proof filter module, a nitrogen regeneration module, and a near-zero emission module. The negative pressure dust removal module, the explosion-proof filter module, the nitrogen regeneration module, and the near-zero emission module are independent of each other. The negative pressure dust removal module includes a vacuum cleaning fan and a distributed cleaning network.

[0007] Preferably, the distributed cleaning network includes several quick-connect interfaces, each with one end connected to a dust collection point and the other end connected to the emergency pulverized coal storage tank filter; each quick-connect interface is equipped with a spring-loaded sealing plug and a filter. The spring-loaded sealing plug, as a key component of the material inlet, achieves automatic opening and closing through an elastic structure, remaining sealed when not in operation to prevent dust leakage; and opening during operation to allow pulverized coal to enter.

[0008] Preferably, the explosion-proof filter module includes a double-layer filter bag structure, which is disposed inside the filter of the emergency pulverized coal storage tank.

[0009] Preferably, the double-layer filter bag structure includes a frame and a filter bag, the filter bag is sleeved on the outer surface of the frame, the outer layer material of the filter bag is antistatic polyester, and the inner layer material is PTFE gradient membrane.

[0010] Preferably, the nitrogen regeneration module includes a pulse backflushing unit, and the pulse backflushing system is connected to the top of the emergency pulverized coal storage tank filter via a pipeline.

[0011] Preferably, a differential pressure gauge is provided on the side of the filter of the emergency pulverized coal storage tank. The differential pressure gauge is connected to an intelligent control system for controlling the start and stop of the backflushing system based on the detected differential pressure signal.

[0012] Preferably, the near-zero emission module includes a double-layer electric flap valve, which is located at the bottom of the emergency pulverized coal storage tank filter.

[0013] Preferably, the bottom of the pulverized coal storage tank filter is provided with a discharge port, and the discharge port is provided with a plurality of atomizing nozzles.

[0014] Preferably, it also includes a screw conveyor, the inlet of which is connected to the bottom of the emergency pulverized coal storage tank filter.

[0015] Preferably, a rupture disc is provided on one side of the emergency pulverized coal storage tank filter. The rupture disc is located in the housing of the regasification chamber in the pulverized coal storage tank filter.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a coal chemical powder material cleaning and recycling system. The negative pressure dust removal module utilizes a vacuum cleaning fan to generate high negative pressure, providing power for dust extraction while simultaneously providing sufficient negative pressure and airflow to ensure effective dust extraction and long-distance transportation, preventing dust settling and accumulation within pipelines. A distributed cleaning network expands the effective dust extraction range, reduces dust diffusion opportunities, and achieves localized collection, curbing dust escape at its source. This invention uses a stable negative pressure provided by a fan, transmitted to each dust collection point through a distributed cleaning network; the scientifically laid-out distributed network ensures efficient utilization of the negative pressure generated by the fan, reducing pressure loss. The synergistic effect of both improves dust collection efficiency. The explosion-proof filter module achieves efficient filtration while ensuring safety. The nitrogen regeneration module uses pulsed airflow of inert nitrogen to remove dust adhering to the filter of the emergency coal storage tank, restoring its permeability. The near-zero emission module ensures that the collected material is not easily escaped during final discharge and transfer.

[0017] Furthermore, the distributed cleaning network's quick-connect interface allows the recycling system to flexibly connect to multiple dispersed dust-generating points within the workshop, expanding the capture range. Spring-loaded plugs ensure the interface remains sealed when not in use, preventing air leakage and maintaining stable negative pressure in the system. Filters at the interface can initially intercept large particles or sparks, protecting the downstream main filtration system and extending filter bag life.

[0018] Furthermore, in the double-layer filter bag structure, the frame provides mechanical support, preventing the filter bag from being sucked down or twisted, ensuring effective filtration area and airflow channels. The antistatic polyester outer layer dissipates static electricity generated by friction on the filter bag surface, greatly reducing the risk of spark discharge igniting explosive coal dust. The PTFE gradient membrane inner layer provides extremely high filtration accuracy. The PTFE (polytetrafluoroethylene) membrane has a dense surface, small and uniformly distributed pores, and can efficiently capture submicron-sized dust particles, ensuring high capture efficiency.

[0019] Furthermore, the pulse backflushing system can be used to clean filter bags. High-pressure pulses are released instantaneously, passing through the filter bag in reverse, causing it to expand and shake violently, thereby shaking off the dust cake adhering to the outer surface of the filter bag.

[0020] Furthermore, the differential pressure feedback from the differential pressure gauge directly reflects the degree of filter bag clogging. The recovery system automatically triggers backflushing based on the real-time differential pressure signal, which is superior to timed backflushing, avoiding unnecessary nitrogen consumption or increased system resistance caused by untimely dust removal, thus achieving a balance between energy saving and efficient operation.

[0021] Furthermore, the dual-layer electric flap valve plays a crucial sealing role during discharge. Its dual-valve design ensures that one valve closes while the other opens, maintaining a constant sealing barrier and significantly reducing the possibility of dust escaping during unloading. Furthermore, the atomizing nozzle sprays extremely fine water mist at the discharge port. The water mist particles encapsulate and wet the dust particles, causing them to increase in weight and agglomerate, thereby effectively suppressing dust generated during the unloading process.

[0022] Furthermore, screw conveyors provide a closed, continuous mechanical conveying method that safely transports collected powder materials to designated locations, avoiding the leakage and secondary pollution that may occur with traditional methods.

[0023] Furthermore, the rupture disc serves as a passive safety pressure relief mechanism. When the pressure inside the filter rises sharply due to an accident (such as combustion), the rupture disc will rupture first, quickly releasing the pressure and thus protecting the cleaning and recycling system from explosive damage. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the coal chemical powder material cleaning and recovery system of this utility model; Among them: 1-Emergency pulverized coal storage tank filter; 2-Quick interface; 3-Spring plug; 4-Filter; 5-Pulse backflushing system; 6-Vacuum cleaning fan; 7-Differential pressure gauge; 8-Rupture disc; 9-Double-layer electric flap valve; 10-Screw conveyor; 11-Atomizing nozzle; 12-Discharge port; 13-Manhole; 14-Double-layer filter bag. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Example 1 This embodiment provides a powder material cleaning and recycling system for a coal chemical production workshop, including an emergency coal storage tank filter 1, on which a negative pressure dust removal module, an explosion-proof filter module, a nitrogen regeneration module and a zero near-emission module are integrated and installed. The negative pressure dust removal module includes a vacuum cleaning fan 6 and a distributed cleaning network. The vacuum cleaning fan 6 uses a frequency-controlled Roots vacuum pump with a power of 55kW and a rated flow rate of 1500m³ / h. 3 / h, vacuum level up to -50kPa. Silencers are installed at both the inlet and outlet of the blower. The distributed cleaning network uses DN80 wear-resistant seamless steel pipes. Twenty quick-connect interfaces 2 are installed throughout the workshop, located at dust emission points such as belt conveyor transfer points, crusher outlets, and silo pressure relief ports. Each quick-connect interface 2 is equipped with a spring plug 3 and a stainless steel primary filter 4 to prevent air leakage and the intake of large foreign objects when not in use.

[0028] The top of the vacuum cleaning blower 6 is equipped with a vent valve, which is used to discharge the gas filtered by the coal powder storage tank filter 1 to the atmosphere.

[0029] Preferably, the spring in the spring plug 3 is a helical spring, and the spring plug 3 is provided with a cross baffle, which can physically block and intercept large particles of foreign matter, forming a double protection together with the filter 4, reducing the equipment failure rate.

[0030] More preferably, the vacuum cleaning fan 6 is a frequency converter with a power of 55kW and a flow rate of 1450-1550m³ / h. 3 / h. Variable frequency vacuum cleaning fans can automatically adjust their speed and power according to the actual system resistance or dust load: low-speed operation saves energy when dust generation is low; high-speed operation provides sufficient negative pressure when a large air volume is required. In a further preferred embodiment, the side of the emergency pulverized coal storage tank filter 1 is also provided with a manhole 13 for internal inspection and cleaning, such as entering the interior of the emergency pulverized coal storage tank filter 1 to check the blockage, damage or ash accumulation of the filter bag; it is also used for replacing parts: when the filter bag reaches the end of its service life or is damaged, it is replaced.

[0031] The explosion-proof filter module includes a double-layer filter bag structure, which is installed inside the emergency pulverized coal storage tank filter 1. The double-layer filter bag structure contains a total of 48 filter bags. Each filter bag is supported by a stainless steel frame, and the filter bag itself has a double-layer composite structure: the outer layer is 550g / m³. 2It is made of antistatic polyester needle-punched felt; the inner layer is covered with an ePTFE (expanded polytetrafluoroethylene) gradient membrane, with a filtration accuracy of up to 0.1μm, ensuring ultra-high efficiency filtration.

[0032] The nitrogen regeneration module includes a pulse backflushing system 5, consisting of a gas storage tank (0.5m). 3 It consists of a pulse valve (submerged type), a blowpipe, and a nitrogen source (nitrogen from the plant's pipeline network, pressure 0.5-0.7MPa). The backflush pipeline is connected to each blowpipe at the top of the emergency pulverized coal storage tank filter 1. An intelligent differential pressure gauge 7 is installed on the side wall of the emergency pulverized coal storage tank filter 1 to monitor the pressure difference inside and outside the filter bag in real time.

[0033] The near-zero emission module includes a double-layer electric flap valve 9, which is located at the bottom conical discharge port 12 of the emergency pulverized coal storage tank filter 1; the double-layer electric flap valve is a pneumatic actuator and has a position switch.

[0034] A shaftless screw conveyor 10 is connected below the discharge port 12 to convey the collected dust in a sealed manner to the ton bag baler or return conveyor belt.

[0035] Six ultrasonic atomizing nozzles 11 are evenly distributed around the inside of the discharge port 12, which can spray micron-level water mist onto the falling dust.

[0036] A rupture disc 8 is installed on the side of the filter 1 of the pulverized coal storage tank as a safety explosion relief device; the burst pressure of the rupture disc 8 is 0.1 MPa.

[0037] All modules are centrally controlled by a PLC intelligent control system. The system integrates a touch screen that can display parameters such as pressure, differential pressure, fan frequency, and valve status in real time, and realize automatic interlock control.

[0038] The working principle of this utility model is as follows: The coal chemical powder material cleaning and recovery system utilizes the high negative pressure generated by the vacuum cleaning fan 6 to draw dust such as pulverized coal and urea scattered on equipment surfaces, the ground, and in the air into the system pipeline through the suction ports of the distributed cleaning network. The dust-laden airflow enters the emergency pulverized coal storage tank filter 1, and after high-efficiency filtration by the double-layer filter bag structure 14, the dust is trapped on the outer surface of the filter bags. The purified air is discharged into the atmosphere by the fan, achieving near-zero emissions. As the dust layer on the filter bag surface thickens, when the differential pressure gauge 7 detects that the resistance has increased to the set value, the PLC automatically starts the nitrogen pulse backflushing system 5 to clean the filter bags. The collected dust is discharged through the double-layer flap valve 9 and the screw conveyor 10, during which the atomizing nozzle 11 is opened to suppress dust. The entire process is closed and automatic, effectively solving the problems of fugitive dust emissions, low recovery efficiency, and safety hazards. This utility model's coal chemical powder material clean recovery system is applied to a 1.8 million tons / year coal-to-olefins project: Cleaning phase: Vacuum cleaning fan 6 is started and set to a frequency of 40Hz and a vacuum degree of -0.08MPa. Each floor operates synchronously with a flow rate of 18±2m / s. Filter regeneration stage: When the real-time system differential pressure ΔP fed back by differential pressure gauge 7 reaches 1.2 kPa, the pulse backflush system 5 is triggered; Environmental emission stage: When the material level in the pulverized coal storage tank filter 1 reaches 80% or the operator manually starts the pulverization procedure, the screw conveyor 10 starts. The speed of the screw conveyor 10 is 12 rpm and the noise is <75dB. The lower flap valve of the double-layer electric flap valve 9 opens after a 3-second delay, simultaneously activating the atomizing nozzle 11, and then opening the upper flap valve. The water consumption of the atomizing nozzle 11 is <0.5L / kg pulverized coal.

[0039] Running result: Dust collection capacity decreased from 325 tons / year to 28 tons / year, and wastewater generation decreased from 0.8 m³ / year. 3 / t decreased to 0.15m 3 / t, saving 150 tons of standard coal per year.

[0040] The atomizing nozzle is connected to a PLC controller, which is configured based on ΔP=0.023Q. 2 The +1.12t+0.56 model adjusts the speed of the vacuum cleaning fan. When the material level reaches 80%, the double-layer electric flap valve 9 is triggered. In the above model, ΔP is the real-time system pressure difference, reflecting the resistance of the dust collector filter bag or pipeline, and is a key indicator for judging the timing of dust removal. Q is the gas volume flow rate, the amount of gas flowing through the dust removal system. An increase in flow rate will significantly increase the pressure difference. t is the running time or temperature variable. If it is the running time, it represents the gradual blockage caused by dust accumulation in the filter bag. If it is the temperature, it is related to the change in gas viscosity. The constant term is the basic resistance of the system. The initial resistance of the equipment, such as pipeline friction and initial pressure loss of the filter bag, is related to the equipment structure.

[0041] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A clean recovery system for coal chemical powder materials, characterized in that, It includes an emergency pulverized coal storage tank filter (1), which is connected to a negative pressure dust removal module, an explosion-proof filter module, a nitrogen regeneration module and a near-zero emission module. The negative pressure dust removal module, the explosion-proof filter module, the nitrogen regeneration module and the near-zero emission module are independent of each other. The negative pressure dust removal module includes a vacuum cleaning fan (6) and a distributed cleaning network.

2. The coal chemical powder material cleaning and recovery system according to claim 1, characterized in that, The distributed cleaning network includes several quick interfaces (2), one end of each quick interface (2) is connected to a dust collection point, and the other end is connected to the filter (1) of the emergency coal storage tank; each quick interface (2) is provided with a spring plug (3) and a filter (4).

3. The coal chemical powder material cleaning and recovery system according to claim 1, characterized in that, The explosion-proof filter module includes a double-layer filter bag structure (14), which is installed inside the emergency pulverized coal storage tank filter (1).

4. The coal chemical powder material cleaning and recovery system according to claim 3, characterized in that, The double-layer filter bag structure (14) includes a keel and a filter bag. The filter bag is fitted on the outer surface of the keel. The outer layer material of the filter bag is antistatic polyester, and the inner layer material is PTFE gradient membrane.

5. The coal chemical powder material cleaning and recovery system according to claim 1, characterized in that, The nitrogen regeneration module includes a pulse backflushing system (5), which is connected to the top of the emergency pulverized coal storage tank filter (1) via a pipeline.

6. The coal chemical powder material cleaning and recovery system according to claim 5, characterized in that, A differential pressure gauge (7) is provided on the side of the filter (1) of the pulverized coal storage tank in the accident. The differential pressure gauge (7) is connected to an intelligent control system and is used to control the start and stop of the pulse backflushing system (5) according to the detected differential pressure signal.

7. The coal chemical powder material cleaning and recovery system according to claim 1, characterized in that, The near-zero emission module includes a double-layer electric flap valve (9), which is located at the bottom of the emergency pulverized coal storage tank filter (1).

8. The coal chemical powder material cleaning and recovery system according to claim 1, characterized in that, The bottom of the pulverized coal storage tank filter (1) is provided with a discharge port (12), and a number of atomizing nozzles (11) are provided on the discharge port (12).

9. A coal chemical powder material cleaning and recovery system according to claim 1, characterized in that, It also includes a screw conveyor (10), the inlet of which is connected to the bottom of the emergency pulverized coal storage tank filter (1).

10. A coal chemical powder material cleaning and recovery system according to claim 1, characterized in that, The filter (1) of the pulverized coal storage tank in the accident is provided with a rupture disc (8) on one side.

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