A fly ash and silica dust collection system

Abstract

The utility model discloses a fly ash and silica dust collecting system, including fly ash storehouse, silica dust storehouse, cyclone separator, dust remover, fan, the fly ash storehouse is passed to the first pipeline intercommunication with silica dust, cyclone separator, dust remover, fan set in fly ash storehouse top, the air inlet of cyclone separator is connected with the exhaust port of fly ash storehouse through the second pipeline, the discharge pipe of cyclone separator is connected with fly ash storehouse, the gas outlet of cyclone separator is connected with the air inlet of dust remover through the third pipeline, the gas outlet of dust remover is connected with the air inlet of fan through the fourth pipeline, the air outlet of fan is connected with the return air inlet of silica dust storehouse through the fifth pipeline, the utility model discloses dust collecting effect is good, and system operation energy consumption is low, and the operation stability is good, can realize to fly ash and silica dust recycling, and recovery efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of dust collection technology for fly ash and silicon powder silos, and in particular to a dust collection system for fly ash and silicon powder. Background Technology

[0002] Currently, fly ash and silica fume treatment generally employ separate silo and independent dust collection systems. Fly ash silos require a cyclone separator, bag filter, and high-pressure fan (typically ≥90kW). Silica fume silos, due to their finer dust particle size (d50=0.1-0.3μm), require an additional high-efficiency cartridge dust collector (≥75kW). When both systems operate in parallel, the total power consumption of the fans reaches 165kW, but the effective dust collection power is only 115kW, resulting in a power waste rate as high as 30.3% (due to equipment redundancy and air pressure mismatch). Furthermore, fly ash typically has a moisture content of 5-8% (typical for coal-fired power plants), and humid gases from the fly ash silo can intrude into the silica fume silo through traditional direct-connection ducts. After absorbing moisture, the silica fume undergoes a hydration reaction, forming hard clumps. This causes the thickness of the clumps at the bottom of the silica fume silo to increase by an average of 15cm per month, requiring manual cleaning during system shutdown. The hardness of the clumps reaches Mohs 4, and the cleaning process damages the silo wall coating. Existing technologies directly discharge or landfill the silicon powder collected by dust collectors, resulting in two major wastes: loss of high-value-added resources. The market price of silicon powder is about 2,000-5,000 yuan / ton. A medium-sized ferrosilicon plant emits more than 800 tons per year, resulting in economic losses of 1.6-4 million yuan per year. Silicon powder can be used as an active admixture in fly ash-based building materials (such as geopolymers) to increase compressive strength by more than 30%, but the existing system has not built a recycling channel. Utility Model Content

[0003] This invention provides a dust collection system for fly ash and silicon powder, which solves the problems of high energy consumption, easy blockage of dust collection pipes, large amount of resource waste, and poor dust collection effect of traditional fly ash and silicon powder raw material silo dust removal equipment.

[0004] This utility model provides a dust collection system for fly ash and silicon powder, including a fly ash silo, a silicon powder silo, a cyclone separator, a dust collector, and a fan. The fly ash silo and silicon powder are connected through a first pipe. The cyclone separator, dust collector, and fan are installed on the top of the fly ash silo. The air inlet of the cyclone separator is connected to the air outlet of the fly ash silo through a second pipe. The discharge pipe of the cyclone separator is connected to the fly ash silo. The air outlet of the cyclone separator is connected to the air inlet of the dust collector through a third pipe. The air outlet of the dust collector is connected to the air inlet of the fan through a fourth pipe. The air outlet of the fan is connected to the return air outlet of the silicon powder silo through a fifth pipe.

[0005] In the above technical solution, preferably, the fifth pipe is connected to the silicon powder storage via a seventh pipe.

[0006] In the above technical solution, preferably, the first pipe is inverted V-shaped.

[0007] In the above technical solution, preferably, differential pressure transmitters are installed at the top of both the fly ash silo and the silicon powder silo.

[0008] In the above technical solution, preferably, a hot air blower is installed on the top of the fly ash silo, and the air outlet of the hot air blower is connected to the first pipe through a sixth pipe.

[0009] In the above technical solution, preferably, pneumatic control valves are installed on the unloading pipe of the cyclone separator, the discharge pipe of the dust collector, and the seventh pipe.

[0010] In the above technical solution, preferably, a humidity sensor is installed at the air inlet of the first pipe.

[0011] As can be seen from the above technical solutions, this utility model provides a dust collection system for fly ash and silicon powder.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. Dust from the fly ash silo and silica fume silo is collected by a fan and fed into a cyclone separator. Larger particles are separated by the cyclone separator and then removed by a dust collector. The gas after dust removal is then transported back to fly ash silo 1 by a fan. Dust collection from the fly ash silo and silica fume silo is achieved by a single dust collection system. The dust collection system has low operating costs, high dust collection efficiency, and realizes the recycling of fly ash dust and silica fume dust. The system has good operational stability.

[0013] 2. The fly ash silo and silicon powder silo are connected by the inverted V-shaped first pipe. During the process of transferring dust from the fly ash silo to the silicon powder silo, most of the particulate matter can be intercepted and recycled through the inverted V-shaped structure of the first pipe.

[0014] 3. Use a humidity sensor and a hot air blower to pre-dry the dust entering the first pipe of the fly ash silo, reduce dust caking inside the pipe and prevent pipe blockage. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a dust collection system for fly ash and silicon powder proposed in this utility model. Figure 2 This is a three-dimensional structural diagram of a dust collection system for fly ash and silicon powder proposed in this utility model.

[0017] In the picture: 1-Fly ash silo; 2-Silica powder silo; 3-Cyclone separator; 4-Dust collector; 5-Fan; 6-Hot air blower; 7-Pneumatic control valve; 101-First pipeline; 102-Second pipeline; 103-Third pipeline; 104-Fourth pipeline; 105-Fifth pipeline; 106-Sixth pipeline; 107-Seventh pipeline. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0019] Example 1: See Figure 1-2 A dust collection system for fly ash and silica fume includes a fly ash silo 1, a silica fume silo 2, a cyclone separator 3, a dust collector 4, and a fan 5. The fly ash silo 1 and silica fume silo 2 are connected by a first pipe 101. The cyclone separator 3, dust collector 4, and fan 5 are installed on top of the fly ash silo 1. The air inlet of the cyclone separator 3 is connected to the air outlet of the fly ash silo 1 through a second pipe 102. The discharge pipe of the cyclone separator 3 is connected to the fly ash silo 1. The air outlet of the cyclone separator 3 is connected to the air inlet of the dust collector 4 through a third pipe 103. The air outlet of the dust collector 4 is connected to the air outlet of a fourth pipe 104. 04 is connected to the air inlet of the fan 5, and the air outlet of the fan 5 is connected to the return air outlet of the silicon powder silo 2 through the fifth pipe 105. The dust in the fly ash silo 1 and silicon powder silo 2 is collected by the fan 5 into the cyclone separator 3. After the larger particles are separated by the cyclone separator 3, they are removed by the dust collector 4. The gas after dust removal is transported back to the fly ash silo 1 by the fan. The dust collection of fly ash silo 1 and silicon powder silo 2 is achieved by a single dust collection system. The dust collection system has low operating cost, high dust collection efficiency, realizes the recycling of fly ash dust and silicon powder dust, and has good system operation stability.

[0020] Preferably, see Figure 1 , 2 The fifth pipe 105 is connected to the silicon powder silo 2 through the seventh pipe 107 to supplement the air pressure of the silicon powder silo 2, so that the internal air pressure reaches a relatively balanced state.

[0021] Preferably, see Figure 1 The first pipe 101 is inverted V-shaped. The vertical height of the highest inflection point of the first pipe 101 above the silicon powder storage 2 is ≥3m (to prevent particles from rushing straight in and to pre-intercept particulate matter). An inspection port is provided on the top side wall and is closed by an inspection door. The inner wall of the inverted V-shaped first pipe 101 is cleaned. The cleaning cycle is ≤72h. The inner wall of the first pipe 101 is sprayed with a tungsten carbide wear-resistant layer (1.2mm thick), with a wear life of >5 years.

[0022] Preferably, a humidity sensor (such as SensirionSHT45) (not shown in the figure) is installed at the air inlet of the first pipe 101 in the fly ash silo 1. A dustproof metal filter (0.3mm aperture) is installed around the humidity sensor to prevent the humidity sensor from being damaged by dust. The humidity sensor detects the humidity of the fly ash gas entering the first pipe 101. The humidity sensor is connected to a PLC controller by wires. The PLC model is Siemens S7-1200 and equipped with a PID control module.

[0023] Preferably, see Figure 1 , 2 A hot air blower 6 is installed on the top of the fly ash silo 1. The outlet of the hot air blower 6 is connected to the first pipe 101 through the sixth pipe 106. The hot air blower 6 has a power of 45kW, an outlet air temperature of 50-100℃ (adjustable), and an air volume of 2000m³. 3 / h, linked with a humidity sensor, automatically starts when the detected humidity is >6%, reducing silicon powder caking, and reducing the caking rate from 15cm / month to a lower level.

[0024] Preferably, see Figure 1 , 2 Pneumatic control valves 7 are installed on the unloading pipe of cyclone separator 3, the discharge pipe of dust collector 4, and the seventh pipe 107. The valve core of pneumatic control valve 7 is made of silicon carbide ceramic (resistant to silicon powder erosion), with an opening resolution of 0.1° and a response time of <0.3s. Differential pressure transmitters are installed at the top of fly ash silo 1 and silicon powder silo 2, specifically CYB268-EX dust explosion-proof differential pressure transmitters, which adopt a stainless steel fully welded sealed structure (IP67) to effectively isolate dust intrusion. The diffused silicon sensor is equipped with wide temperature compensation (-30℃~175℃), which has strong stability; wide range coverage (-100Pa~1000kPa), and overload capacity up to 300%; the differential pressure transmitter's data... According to the PLC controller, the pressure gradient is calculated in real time; the opening of the frequency converter of the fan 5 and the pneumatic control valve 7 are dynamically adjusted. When the air pressure in the silicon powder silo 2 is relatively high, the air intake of the seventh pipe 107 should be appropriately reduced. Conversely, the air intake of the seventh pipe 107 should be increased. When there is no pressure difference in the fly ash silo 1 and the silicon powder silo 2, the pneumatic control valve 7 on the seventh pipe 107 should be closed. It can be understood that if the pressure difference = (P silicon powder silo - P fly ash silo) > +50Pa, the opening of the pneumatic valve on the seventh pipe 107 should be reduced by 20%; if the pressure difference < -50Pa, the opening of the pneumatic valve on the seventh pipe 107 should be increased by 30%; if the pressure difference ≤ 10Pa, the pneumatic valve on the seventh pipe 107 should be closed.

[0025] As can be seen from the above technical solutions, when using them: 1. After the system starts, the differential pressure system runs first to establish a balanced pressure field. The differential pressure transmitter installed at the top of the fly ash silo 1 and the silica fume silo 2 detects the pressure difference between the two silos. The opening and closing of the seventh pipeline 107 is controlled according to the pressure difference. The differential pressure transmitter (sampling frequency 10Hz) monitors the pressure of the two silos in real time. The PLC controller calculates the pressure difference and adjusts the frequency converter of the fan 5 (frequency range 30-50Hz) and the opening of the valve in the seventh pipeline. 2. Then start the fan 5. The humidity sensor detects the gas inlet of the first pipe 101. If the humidity is >6%, the hot air fan 6 starts and the valve on the sixth pipe 106 is 100% open. If the humidity is ≤4%, the hot air system is in standby mode and the valve on the sixth pipe 106 is 0% open. After mixing, the gas temperature rise is measured by the temperature sensor to be 40-60℃. 3. The dust-laden gas in the fly ash silo 1 enters the silicon powder silo 2 through the inverted V-shaped first pipe 101. The inverted V-shaped first pipe 101 ensures that the settling rate of large particles is >80%. The dust in the silicon powder silo 2 enters the cyclone separator 3 through the second pipe 102. The cyclone separator 3 can achieve a separation efficiency of 90%. The solid particles are separated by the cyclone separator 3. The gas is discharged into the dust collector 4 through the third pipe 103. The residual silicon powder is intercepted by the nano-coated filter bag (filtration accuracy 0.1μm). After dust removal by the dust collector 4, the dust-removed gas is sent to the fan 5 through the fourth pipe 104. The fan 5 sends the dust-removed gas back to the fly ash silo 1 through the fifth pipe 105 to form a closed loop.

[0026] This implementation method can reduce the power consumption of the fan by 21.2%, breaking through the traditional dual-silo independent dust removal mode; the moisture content of the silicon powder is <0.3%, achieving low caking operation; 100% of the silicon powder is recycled for the modification of fly ash building materials, with an annual added value of over 3 million yuan, realizing the recycling and reuse of fly ash dust and silicon dust.

[0027] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0028] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A dust collection system for fly ash and silica fume, comprising a fly ash silo (1), a silica fume silo (2), a cyclone separator (3), a dust collector (4), and a fan (5), characterized in that: The fly ash silo (1) and the silicon powder silo (2) are connected by a first pipe (101). The cyclone separator (3), dust collector (4), and fan (5) are located on the top of the fly ash silo (1). The air inlet of the cyclone separator (3) is connected to the air outlet of the fly ash silo (1) through a second pipe (102). The discharge pipe of the cyclone separator (3) is connected to the fly ash silo (1). The air outlet of the cyclone separator (3) is connected to the air inlet of the dust collector (4) through a third pipe (103). The air outlet of the dust collector (4) is connected to the air inlet of the fan (5) through a fourth pipe (104). The air outlet of the fan (5) is connected to the return air outlet of the silicon powder silo (2) through a fifth pipe (105).

2. The dust collection system for fly ash and silica fume according to claim 1, characterized in that, The fifth pipe (105) is connected to the silicon powder storage (2) via the seventh pipe (107).

3. The dust collection system for fly ash and silica fume according to claim 1, characterized in that, The first pipe (101) is an inverted V shape.

4. The dust collection system for fly ash and silica fume according to claim 1, characterized in that, Differential pressure transmitters are installed at the top of both the fly ash silo (1) and the silicon powder silo (2).

5. The dust collection system for fly ash and silica fume according to claim 1, characterized in that, A hot air blower (6) is installed on the top of the fly ash silo (1), and the air outlet of the hot air blower (6) is connected to the first pipe (101) through the sixth pipe (106).

6. The dust collection system for fly ash and silica fume according to claim 1, characterized in that, Pneumatic control valves (7) are installed on the unloading pipe of the cyclone separator (3), the discharge pipe of the dust collector (4), and the seventh pipe (107).

7. The dust collection system for fly ash and silica fume according to claim 1, characterized in that, A humidity sensor is installed at the air inlet of the first pipe (101).

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