System capable of accurately regulating and controlling fly ash recycling ratio

Abstract

The utility model provides a system capable of accurately regulating and controlling fly ash recycling ratio, which comprises a raw ash bin mounted on a bag-type dust collector; the two-way adjustable distributor is mounted at the outlet of the raw ash bin, and the two-way adjustable distributor is provided with an ash discharge port and a circulating discharge port; the weightlessness scale is connected to the circulating discharging opening and used for collecting discharging amount information of the circulating discharging opening; the collection conveyor is connected to the weightlessness scale and is used for conveying the raw ash in the weightlessness scale to the next link; the grinding and sorting machine is connected to the discharge hole of the collecting and conveying machine and is used for grinding the raw ash; the injection mechanism is connected to a discharge hole of the grinding and sorting machine and is used for injecting the ground raw ash into the inlet flue; and the control equipment is in electric signal connection with the raw ash bin, the two-way adjustable distributor, the weightlessness scale, the collection conveyor and the injection mechanism. The problem that in the background technology, it is difficult for a system to balance the dynamic restriction relation among the fly ash circulation amount, the flue gas index and the deacidification agent dosage is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of household garbage incineration flue gas treatment and fly ash recirculation, and more particularly to a system capable of precisely regulating fly ash recirculation ratio. BACKGROUND

[0002] At present, most domestic household garbage incineration power plants that adopt dry deacidification treatment of flue gas use lime as a deacidifying agent. Specifically, lime powder is sprayed into the flue gas pipeline before the inlet end of the bag-type dust collector, so that its surface reacts with acidic substances, thereby removing acidic gases in the flue gas. According to research results, more than 50% to 60% of the sprayed lime does not participate in the reaction. The reason is that a salt material coating layer is formed on the surface of the lime after the reaction, thereby resulting in low utilization rate of the lime. The unreacted lime enters the rear end as fly ash for treatment, which greatly increases the fly ash treatment and disposal cost. Patent 201420575120.X discloses a garbage incineration dry fly ash recirculation system. In this method, fly ash is sprayed into the flue before the desulfurization tower, and the unreacted desulfurizing agent in the fly ash is subjected to secondary reaction, which can reduce the use amount of the desulfurizing agent and the total amount of fly ash generated. The fly ash containing a large amount of unreacted deacidifying agent collected by the dust collector is returned to the flue gas treatment system for reapplication, thereby reducing the deacidifying agent use amount of the original flue gas and the fly ash generation amount. However, directly feeding the fly ash back into the flue gas treatment system cannot fully contact the fly ash with the above-mentioned pollutants in the flue gas and cause reaction again, because the surface of the calcium hydroxide particles in the fly ash is covered by the reaction products such as carbon dioxide, sulfur oxide, and hydrogen chloride in the previous flue gas, thereby resulting in that the deacidifying agent utilization rate is not obviously improved. In view of this problem, patent 201711500606.1 discloses a household garbage incineration fly ash recycling method. This method increases a grinding device on the basis of the original method, and adds a new additive during the grinding process to improve the deacidifying agent utilization rate. A shunt device and a flowmeter are installed at the outlet of the dust collector ash conveying equipment. Part of the fly ash collected by the dust collector is shunted to the mediumless grinding machine. The mass of the fly ash circulating into the mediumless grinding machine is controlled by adjusting the opening degree of the shunt device, and the mass of the fly ash entering the fly ash storage library is controlled. Through the above-mentioned method, the deacidifying agent utilization rate can be effectively improved, and the industrial continuous operation is also initially realized. However, since the working principle of the bag-type dust collector is intermittent ash cleaning, the original ash falls in each original ash bin, and then is conveyed by the ash conveying chain. The original ash conveyed by the ash conveying chain to the shunt device has a long distance and a long time, which seriously affects the continuous operation of the recycling system. Moreover, the entire system only realizes the initial continuous recycling operation. The simple opening degree combined with the flowmeter control of the feeding amount cannot realize the regulation and control function, it is difficult to master the circulation ratio of the recycling system, and in the face of increasingly stringent flue gas emission standards, the system is difficult to balance the dynamic constraint relationship between the fly ash circulation amount and the flue gas index and the deacidifying agent use amount.

[0003] Therefore, on this basis, a system capable of accurately regulating the fly ash recirculation ratio is developed, effectively balancing the dynamic constraint relationship between the fly ash circulation amount and the flue gas index, the amount of deacidification agent, so that the compatibility of the dry flue gas deacidification fly ash circulation system is better, and the best fly ash circulation ratio can be accurately found for different dry flue gas deacidification systems, greatly improving the utilization rate of the deacidification agent, reducing the total amount of fly ash generated, and the industrial application of the technology has a very positive effect. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a system capable of accurately regulating the fly ash recirculation ratio, solving the problem of balancing the dynamic constraint relationship between the fly ash circulation amount and the flue gas index, the amount of deacidification agent in the background art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is: a system capable of accurately regulating the fly ash recirculation ratio, comprising:

[0006] The original ash bin is installed in the bag-type dust collector.

[0007] The double-path adjustable distributor is installed at the outlet of the original ash bin, and has an ash discharge port and a circulating discharge port.

[0008] The loss-in-weight scale is connected to the circulating discharge port and is used to collect the discharge amount information of the circulating discharge port.

[0009] The collection conveyor is connected to the loss-in-weight scale and is used to convey the original ash from the loss-in-weight scale to the next link.

[0010] The grinding and sorting machine is connected to the discharge port of the collection conveyor and grinds the original ash.

[0011] The injection mechanism is connected to the discharge port of the grinding and sorting machine, and is used to inject the ground original ash into the inlet flue.

[0012] The control device is electrically connected to the original ash bin, the double-path adjustable distributor, the loss-in-weight scale, the collection conveyor, and the injection mechanism.

[0013] Preferably, the double-path adjustable distributor comprises:

[0014] The storage bin is connected to the original ash bin.

[0015] The first distribution mechanism is installed between the storage bin and the circulating discharge port, and is used to convey the original ash in the storage bin to the loss-in-weight scale according to the command of the control device.

[0016] A second material distribution mechanism is installed between the storage bin and the ash discharge port, and is used to transport the raw ash in the storage bin to the ash discharge chain according to the command of the control device.

[0017] Preferably, the first material distribution mechanism comprises:

[0018] A first screw feeder is installed between the storage bin and the circulating discharge port.

[0019] A first servo motor is connected to the first screw feeder, and is used to provide a power source for the first screw feeder and execute a speed command according to the command of the control device to control the rotating speed of the first screw feeder.

[0020] Preferably, the second material distribution mechanism comprises:

[0021] A second screw feeder is installed between the storage bin and the ash discharge port.

[0022] A second servo motor is connected to the first screw feeder, and is used to provide a power source for the second screw feeder and execute a speed command according to the command of the control device to control the rotating speed of the second screw feeder.

[0023] Preferably, the collection conveyor comprises:

[0024] A shell is provided with a raw ash inlet and a raw ash outlet, the raw ash inlet is connected to the loss-in-weight scale, and the raw ash outlet is connected to the grinding and sorting machine, the shell is provided with a heat preservation layer, and the heat preservation layer is used to prevent the raw ash from caking.

[0025] A spiral blade is installed in the shell and is rotationally connected to the shell, and is used to transport the raw ash from the loss-in-weight scale to the grinding and sorting machine under the action of a power source.

[0026] A third servo motor is transmissionally connected to the spiral blade, and is used to provide a power source for the spiral blade.

[0027] Preferably, the heat preservation layer is preferably a hot water pipe, and the hot water pipe is wound on the outside of the shell.

[0028] Preferably, a plurality of raw ash inlets are formed in the shell, and the number of the raw ash inlets is consistent with the number of the raw ash bins.

[0029] Preferably, the spraying mechanism comprises:

[0030] A first spraying pipe is a three-way pipe, and the first spraying pipe is in communication with the grinding and sorting machine.

[0031] A second injection pipe is connected with the first injection pipe through a wear-resistant elbow at one end and communicates with the inlet flue at the other end;

[0032] A Roots blower is connected with the first injection pipe at an end away from the wear-resistant elbow, and the Roots blower is used to deliver the ground raw ash into the inlet flue.

[0033] Preferably, a plug valve is arranged between the collection conveyor and the grinding and sorting machine.

[0034] Preferably, the plug valve is made of acid-resistant, alkali-resistant, high-temperature-resistant and corrosion-resistant material.

[0035] The system for precisely regulating fly ash recirculation ratio provided by the application has the following beneficial effects:

[0036] 1. The raw ash bin is installed in a bag-type dust collector; a double-path adjustable distributor is installed at an outlet of the raw ash bin, the double-path adjustable distributor has an ash discharge port and a recirculation discharge port; a loss-in-weight scale is connected to the recirculation discharge port and used to collect discharge amount information of the recirculation discharge port; a collection conveyor is connected to the loss-in-weight scale and used to deliver raw ash from the loss-in-weight scale to a next link; a grinding and sorting machine is connected to a discharge port of the collection conveyor and grinds the raw ash; an injection mechanism is connected to a discharge port of the grinding and sorting machine, and the injection mechanism is used to inject the ground raw ash into an inlet flue; a control device is electrically connected with the raw ash bin, the double-path adjustable distributor, the loss-in-weight scale, the collection conveyor and the injection mechanism. The dynamic constraint relationship between fly ash recirculation amount and flue gas index and between fly ash recirculation amount and acid-removing agent consumption is effectively balanced, the compatibility of the dry-process flue gas acid-removing fly ash recirculation system is more excellent, the best fly ash recirculation ratio can be accurately found for different dry-process flue gas acid-removing systems, the utilization rate of the acid-removing agent is greatly improved, the total amount of fly ash is reduced, and the technology is applied to industrialization, which has a very positive effect. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0038] Figure 1 The structural schematic diagram of the system for precisely regulating fly ash recirculation ratio provided by the application;

[0039] Figure 2A top view structural schematic diagram of the double-path adjustable distributor provided by the embodiment of the present application;

[0040] Figure 3 A sectional view structural schematic diagram of the double-path adjustable distributor provided by the embodiment of the present application;

[0041] Figure 4 A structural schematic diagram of the collection conveyor provided by the embodiment of the present application;

[0042] Figure 5 A control principle diagram of the system capable of precisely regulating fly ash recirculation ratio provided by the embodiment of the present application.

[0043] In the drawings, various reference numerals refer to:

[0044] 1, bag-type dust collector; 2, outlet flue; 3, inlet flue; 4, raw ash bin; 5, ash discharge chain;

[0045] 6, double-path adjustable distributor; 601, storage bin; 602, first screw feeder; 603, first servo motor; 604, circulating discharge port; 605, second screw feeder; 606, second servo motor; 607, ash discharge port;

[0046] 7, loss-on-ignition balance; 8, collection conveyor; 801, shell; 802, screw blade; 803, third servo motor; 804, raw ash inlet; 805, raw ash outlet; 806, heat tracing water pipe;

[0047] 9, grinding and sorting machine; 10, Roots blower; 11, first injection pipe; 12, second injection pipe; 13, wear-resistant elbow; 14, gate valve; 15, control device; 16, original deacidifying agent injection mechanism; 17, original deacidifying agent injection amount sensor signal; 18, control original deacidifying agent injection mechanism command signal; 19, second injection pipe injection amount sensor signal; 20, flue gas monitoring mechanism; 21, flue gas index data signal; 22, material level sensor signal; 23, first servo motor rotation speed sensor signal; 24, second servo motor rotation speed sensor signal; 25, control first servo motor rotation speed command signal; 26, control second servo motor rotation speed command signal; 26, loss-on-ignition balance feeding amount sensor signal; 27, third servo motor rotation speed sensor signal; 28, control third servo motor rotation speed command signal; 29, grinding and sorting machine motor rotation speed sensor signal; 30, control grinding and sorting machine motor rotation speed command signal; 31, temperature sensor signal; 32, control temperature adjustment command signal; 33, Roots blower motor rotation speed sensor signal; 34, control Roots blower motor rotation speed command signal. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0050] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0051] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0052] Please refer to Figures 1 to 5 , now a system for accurately regulating the fly ash recirculation ratio provided by the embodiments of the present application will be described.

[0053] The system for accurately regulating the fly ash recirculation ratio comprises an original ash bin 4, a double-path adjustable distributor 6, a loss-in-weight scale 7, a collection conveyor 8, a grinding and sorting machine 9, a spraying mechanism, and a control device 15.

[0054] The original ash bin 4 is installed at the bottom of the bag-type dust collector 1 for collecting the fly ash intercepted by the bag-type dust collector 1. A material level sensor is installed in the original ash bin 4, which is used to collect the original ash information in the original ash bin 4.

[0055] The double-path adjustable distributor 6 is installed at the outlet of the raw lime bin 4, and has a lime discharging port 607 and a circulating discharge port 604; the double-path adjustable distributor 6 comprises a storage bin 601 connected to the raw lime bin 4, wherein the inlet section of the storage bin 601 is a square-to-round cylinder structure, the outlet section is a variable-diameter cylinder structure, and the whole presents an inverted Y shape; two symmetrical cavities are arranged in the variable-diameter cylinder structure, and correspond to two outlet ends respectively, one outlet end corresponds to the circulating discharge port, and the other outlet end corresponds to the lime discharging port; the circulating discharge port and the lime discharging port are both designed as arc-shaped horn ports to prevent raw lime from being blocked; an arc-shaped material receiving plate is arranged at the bottom of the cavity, which has the function of converging raw lime and ensures that raw lime is evenly distributed to the first and second distribution mechanisms; the first distribution mechanism is installed between the storage bin 601 and the circulating discharge port 604, and is used to convey raw lime in the storage bin 601 to the loss-in-weight scale 7 according to the command of the control device; specifically, the first distribution mechanism comprises a first screw feeder 602 installed between the storage bin 601 and the circulating discharge port 604; a first servo motor 603 connected with the first screw feeder 602, which is used to provide a power source for the first screw feeder 602 and execute a speed change command according to the command of the control device to control the rotating speed of the first screw feeder 602 and thus control the amount of lime entering the circulating discharge port 604; the second distribution mechanism is installed between the storage bin 601 and the lime discharging port 607, the lime discharging port 607 is communicated with the lime discharging chain 5, and the second distribution mechanism is used to convey raw lime in the storage bin 601 to the lime discharging chain 5 according to the command of the control device; specifically, the second distribution mechanism comprises a second screw feeder 605 installed between the storage bin 601 and the lime discharging port 607; and a second servo motor 606 connected with the first screw feeder 602, which is used to provide a power source for the second screw feeder 605 and execute a speed change command according to the command of the control device to control the rotating speed of the second screw feeder 605 and thus control the amount of lime discharged from the lime discharging port 607.

[0056] The loss-in-weight scale 7 is connected to the circulating discharge port 604, and is used to collect the discharge amount information of the circulating discharge port 604. The loss-in-weight scale 7 is a prior art and a common device in the market, and the specific structure is not described herein.

[0057] The collection conveyor 8 is connected with the loss weight scale 7, and the collection conveyor 8 is used to convey the raw lime from the loss weight scale 7 to the grinding sorting machine 9. Specifically, the collection conveyor 8 comprises a shell 801, the shell 801 is provided with a raw lime inlet 804 and a raw lime outlet 805, the raw lime inlet 804 is connected with the loss weight scale 7, the raw lime outlet 805 is connected with the grinding sorting machine 9, the shell 801 is provided with a heat preservation layer, the heat preservation layer is used to prevent the raw lime from caking, a spiral blade 802 is installed in the shell 801 and is rotationally connected with the shell 801, and the spiral blade 802 is used to convey the raw lime from the loss weight scale 7 to the grinding sorting machine 9 under the action of a power source, and a third servo motor 803 is connected with the spiral blade 802 through a belt and a belt wheel transmission, and the third servo motor 803 is used to provide the power source for the spiral blade 802.

[0058] As a preferred embodiment, the heat preservation layer is preferably a heat tracing water pipe 806 (a heat tracing water pipe inlet is connected with a hot water tank through a pipeline, the hot water tank is used to store boiler drain water, a heat tracing water pipe outlet is connected back to the hot water tank through a pipeline, and the circulation process is realized through a pump, the hot water tank is used to store boiler drain water, and therefore the hot water tank is continuously supplied with hot water. The heat tracing is realized by using the boiler drain water, which fully utilizes the waste heat resources in the factory, saves energy, and reduces energy consumption.), and the heat tracing water pipe 806 is wound on the outside of the shell 801. A plurality of raw lime inlets 804 are formed in the shell 801, and the number of the raw lime inlets 804 is matched with the number of the raw lime bin 4, the double-path adjustable distributor 6 and the loss weight scale 7.

[0059] The grinding sorting machine 9 is connected with the discharge port of the collection conveyor 8 and is used to grind the raw lime, and the grinding sorting machine 9 in the embodiment is common in the market, and the specific structure is not described herein.

[0060] The spraying mechanism is connected with the discharge port of the grinding sorting machine 9, and the spraying mechanism is used to spray the ground raw lime into the inlet flue 3, and specifically, the spraying mechanism comprises a first spraying pipe 11, the first spraying pipe 11 is a three-way pipe, the three-way pipe is connected with the grinding sorting machine 9, a second spraying pipe 12 and a Roots blower 10,

[0061] One end of the second spraying pipe 12 is connected with the first spraying pipe 11 through a wear-resistant elbow 13, and the other end is connected with the inlet flue 3, and the Roots blower 10 is connected with the end of the first spraying pipe 11 away from the wear-resistant elbow 13, and the Roots blower 10 is used to convey the ground raw lime into the inlet flue 3.

[0062] Further, the second injection pipe 12 is also provided with an injection amount sensor, and the inlet flue 3 is provided with an original deacidification agent injection amount sensor, and both are electrically connected with the control device.

[0063] The control device is electrically connected with the original ash bin 4 position sensor, the first and second servo motors 603 and 606 of the double-path adjustable distributor 6, the single-chip microcomputer control unit of the loss-in-weight scale 7, the third servo motor 803 of the collection conveyor 8, the extension of the injection mechanism, the grinding and sorting machine 9, and the flue gas monitoring system. It is to be noted that the control device includes a central processing unit (CPU) for processing data from the sensors and making decisions according to preset algorithms and logic, a programmable logic controller (PLC) for executing specific control instructions, and a human-machine interface (HMI) for providing an interface for operators to interact with the control system, setting parameters, monitoring states, and diagnosing faults.

[0064] Sealed soft connections are used between the original ash bins 4, the double-path adjustable distributor 6, the loss-in-weight scale 7, the heat-traced collection conveyor 8, the grinding and sorting machine 9, and the extension of the injection mechanism at the lower part of the cloth bag dust collector 1, and the outlet of the extension of the injection mechanism and the inlet flue 3 of the original dry flue gas deacidification system are welded. Plug valves 14 are arranged in front of each interface, and the plug valves 14 and each component in contact with the original ash are made of materials resistant to acid, alkali, and high-temperature corrosion.

[0065] Principle: The original deacidification agent injection mechanism 16 is normally operated, and the deacidification agent is injected into the inlet flue before the inlet of the bag dust collector 1. The deacidification agent reacts with the acid gas in the flue, and then is intercepted by the bag of the bag dust collector 1 to form a fly ash raw ash filter layer on the surface of the bag. After a period of time (assuming 15 minutes), the raw ash filter layer is cleaned by the bag dust cleaning device and falls into the raw ash bin 4 below the bag dust collector 1 (this process is due to the different cleaning sequence of each bag bin, resulting in different raw ash amount of each raw ash bin 4). Each raw ash bin 4 is provided with a material level sensor to monitor the material level of the raw ash in the raw ash bin 4 in real time, and then the control device 15 will select to open the double-way adjustable feeder 6 below the raw ash bin 4 reaching the set material level according to the set material level value (the opening process is to control the first servo motor 603 and the second servo motor 606 of the double-way adjustable feeder 6 by outputting motor speed control signals, so as to open the raw ash bin 4 discharge, and the specific speed of the first servo motor 603 and the second servo motor 606 is determined according to the value when the circulation amount is set). After the double-way adjustable feeder 6 is opened, the raw ash will have three types of destinations (1 only to the original ash discharge chain 5; 2 only to the circulation discharge port 604; 3 to the original ash discharge chain 5 and the circulation discharge port 604 according to different proportions), which is also adjusted according to the circulation amount. The raw ash entering the fly ash circulation system first passes through the loss-in-weight scale 7 to measure the feed amount, and the signal value is transmitted to the control device 15 by the feed amount sensor. Then the raw ash enters the heat tracing collection conveyor 8 (used for collecting the raw ash of each raw ash bin 4) for heat preservation and heating during the conveying process to prevent caking. The heat tracing collection conveyor 8 is provided with a third servo motor 803 speed sensor, a temperature sensor, a temperature control adjustment and a motor speed control signal for maintaining the set raw ash temperature and adjusting the conveying speed of the raw ash. Then the raw ash is sent to the grinding and sorting machine 9 for grinding and sorting. The grinding and sorting machine 9 is provided with a motor speed sensor and a motor speed control signal for controlling the grinding time. The ground raw ash enters the injection mechanism, which is provided with a motor speed sensor and a motor speed control signal for controlling the speed of the Roots blower 10, thereby controlling the air volume. The injection amount sensor monitors the injection amount of the circulating fly ash and the injection amount of the original deacidification agent in real time. Then the control device 15 establishes data connection with the original flue gas monitoring mechanism 20 and the original deacidification agent injection mechanism 16. The control device 15 adjusts the output value of each control signal according to the flue gas index change signal of the flue gas monitoring mechanism 20 to realize precise control of the whole system.

[0066] Specifically, the original deacidification system is assumed to be injected into the flue at a rate of 200 Kg / h, intercepted by the bag filter 1 to the original ash bin 4 after a period of time, and then the proportion of the original ash entering the fly ash circulating system and the ash conveying chain is adjusted by the double-way adjustable distributor 6 to adjust the circulating amount, for example, 50 Kg / h enters the fly ash circulating system, 150 Kg / h enters the ash conveying chain and is discharged, 50 Kg / h of the original ash is weighed by the loss-in-weight scale 7 in real time to deliver the feed amount value to the control device 15, then enters the grinding and sorting machine 9 through the heat tracing collection conveyor 8, the control device 15 can adjust the temperature, conveying speed and grinding time in real time according to the received temperature, motor speed and other signals, the original ash after grinding is sprayed into the inlet flue through the spraying mechanism, the original deacidifying agent injection amount sensor and the second spraying pipe injection amount sensor deliver the value in real time to the control device 15, when the injection amount starts to rise from 0 Kg / h, the corresponding control device 15 controls the original deacidifying agent injection amount to start to decrease from 200 Kg / h, until the circulating injection amount rises to 50 Kg / h, the original deacidifying agent injection amount decreases to 150 Kg / h, at this time the circulation reaches balance. Then the precise will adjust the circulating feed amount in real time according to the flue gas index data, until the circulating amount reaches the maximum value without affecting the flue gas index data, at this time the best circulating ratio of the system is obtained.

[0067] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A system for precisely regulating the fly ash recirculation ratio, characterized in that, The application relates to a control device for a raw lime conveying system. The control device comprises: a raw lime bin installed in a bag-type dust collector; a double-path adjustable feeder installed at the outlet of the raw lime bin, the double-path adjustable feeder having a dust outlet and a circulating outlet; a loss-in-weight scale connected to the circulating outlet for collecting the amount of the circulating outlet; a collecting conveyor connected to the loss-in-weight scale for conveying the raw lime from the loss-in-weight scale to the next link; a grinding and sorting machine connected to the outlet of the collecting conveyor and grinding the raw lime; a spraying mechanism connected to the outlet of the grinding and sorting machine, the spraying mechanism being used for spraying the ground raw lime into an inlet flue; 2. The system of claim 1, wherein, the control device is electrically connected to the raw lime bin, the double-path adjustable feeder, the loss-in-weight scale, the collecting conveyor and the spraying mechanism. The double-path adjustable feeder comprises: a storage bin connected to the raw lime bin; a first feeder mechanism installed between the storage bin and the circulating outlet and used for conveying the raw lime in the storage bin to the loss-in-weight scale according to the command of the control device; 3. The system of claim 2, wherein the system is configured to control the fly ash recirculation ratio by adjusting the amount of fly ash recirculated to the mill. a second feeder mechanism installed between the storage bin and the dust outlet and used for conveying the raw lime in the storage bin to a dust conveying chain according to the command of the control device. The first feeder mechanism comprises: a first screw feeder installed between the storage bin and the circulating outlet; 4. The system of claim 3, wherein the system is configured to control the fly ash recirculation ratio by adjusting the amount of fly ash recirculated to the mill. a first servo motor connected to the first screw feeder, the first servo motor being used for providing a power source for the first screw feeder and executing a speed change command according to the command of the control device to control the rotating speed of the first screw feeder. The second feeder mechanism comprises: a second screw feeder installed between the storage bin and the dust outlet; 5. The system of any one of claims 1 to 4, wherein the system is configured to control the fly ash recirculation ratio with a precision of 0.1% or less. a second servo motor connected to the first screw feeder, the second servo motor being used for providing a power source for the second screw feeder and executing a speed change command according to the command of the control device to control the rotating speed of the second screw feeder. The collecting conveyor comprises: a shell, the shell being provided with a raw lime inlet and a raw lime outlet, the raw lime inlet being connected to the loss-in-weight scale, the raw lime outlet being connected to the grinding and sorting machine, the shell being provided with a heat preservation layer outside, the heat preservation layer being used for preventing the raw lime from caking; a spiral blade installed in the shell and rotatingly connected to the shell, the spiral blade being used for conveying the raw lime from the loss-in-weight scale to the grinding and sorting machine under the action of a power source; 6. The system of claim 5, wherein: a third servo motor drivingly connected to the spiral blade, the third servo motor being used for providing a power source for the spiral blade.

7. The system of claim 6, wherein: The heat preservation layer is a hot water pipe, the hot water pipe being wound outside the shell.

8. The system of claim 7, wherein: The shell is provided with a plurality of raw lime inlets, the number of the raw lime inlets being consistent with the number of the raw lime bins. The spraying mechanism comprises: a first spraying pipe, the first spraying pipe being a tee pipe, the first spraying pipe being communicated with the grinding and sorting machine; a second spraying pipe, one end of the second spraying pipe being connected to the first spraying pipe through a wear-resistant elbow, the other end of the second spraying pipe being communicated with the inlet flue. A roots blower is connected to the first injection pipe at a position away from the wear-resistant elbow, and is used to deliver the ground raw ash into the inlet flue.

9. The system of claim 8, wherein: A plug valve is arranged between the collection conveyor and the grinding and sorting machine.

10. The system of claim 9, wherein: The plug valve is made of acid-resistant, alkali-resistant, high-temperature-resistant and corrosion-resistant material.

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