Household garbage incineration fly ash low-temperature pyrolysis device and treatment method thereof

Abstract

The invention relates to the technical field of fly ash treatment, and discloses a household garbage incineration fly ash low-temperature pyrolysis device which comprises a temporary ash storage bin, a spiral feeder and a heat treatment concentration chamber, a spiral conveying pipe of the spiral feeder sequentially comprises a feeding section, a metering section and a control section, the feeding section is communicated with the temporary ash storage bin, and the metering section is communicated with the heat treatment concentration chamber. A rotating shaft is rotationally mounted in the spiral conveying pipe, and spiral blades are distributed on the rotating shaft; a bearing plate and a pressing plate slide up and down on the inner wall of the control section of the spiral conveying pipe, when the pressing plate moves downwards, the pressing plate extrudes fly ash in the control section, the pressing plate extrudes the bearing plate to move downwards, and a reset piece for driving the bearing plate to reset upwards is installed in the spiral conveying pipe; the control section is connected with a discharging pipe, when the bearing plate resets, the discharging pipe is stopped from communicating with the control section, and the control section is provided with a soot blowing pipeline used for allowing inert gas to enter. According to the method, the removal rate of dioxin in fly ash can be higher than 95%, and the subsequent resource utilization requirement is met.

Description

Technical Field

[0001] The present application relates to the technical field of fly ash treatment, and in particular to a low-temperature pyrolysis device for fly ash from the incineration of domestic waste and a treatment method thereof. Background Art

[0002] Fly ash from the incineration of domestic waste is the collection of the flue gas purification system and the bottom ash settled at the bottom of the flue and chimney during the incineration of domestic waste. The output of fly ash generally accounts for 3%-5% of the amount of waste incinerated. Fly ash contains high concentrations of heavy metals such as Cd, Pb, Cu, Zn, Cr and highly toxic dioxins, and is therefore classified as HW18 hazardous substances in the National List of Hazardous Wastes.

[0003] At present, the technology that can efficiently dispose of organic pollutants such as dioxins mainly adopts low-temperature thermal treatment technology. Low-temperature thermal treatment is to decompose and detoxify dioxin pollutants in fly ash through a low-temperature thermal decomposition reaction (300-500℃) in an oxygen-deficient or oxygen-free atmosphere. Low-temperature thermal decomposition has the advantages of large disposal capacity, complete dioxin removal, and low energy consumption. It is the technology with the most promising industrial application prospects.

[0004] The low-temperature pyrolysis device includes a temporary ash storage bin, a weighing screw feeder, a heat treatment concentration chamber, and a water-cooling screw. The fly ash in the temporary ash storage bin enters the heat treatment concentration chamber through the weighing screw feeder. After the fly ash undergoes a low-heat decomposition reaction in the heat treatment concentration chamber, the decomposed product is discharged through the water-cooling screw. The entire process is carried out in a closed manner.

[0005] Regarding the above-mentioned related technologies, during the process of fly ash treatment by the low-temperature pyrolysis device and the process of fly ash entering the heat treatment concentration chamber, the control of oxygen content needs to be improved. If the oxygen content exceeds the standard, it is easy to cause dioxin re-synthesis. Summary of the invention

[0006] In order to further control the oxygen content in the fly ash treatment process, the present application provides a low-temperature pyrolysis device for domestic waste incineration fly ash and a treatment method thereof.

[0007] In the first aspect, the present application provides a low-temperature pyrolysis device for fly ash from incineration of domestic waste, which adopts the following technical solution: A low-temperature pyrolysis device for fly ash from incineration of domestic waste, comprising a temporary ash storage bin, a spiral feeder and a heat treatment concentration chamber, wherein a spiral conveying pipe of the spiral feeder comprises a feeding section, a metering section and a control section in sequence, wherein the feeding section is connected to the temporary ash storage bin, a rotating shaft is rotatably installed in the spiral conveying pipe, and spiral blades are distributed on the rotating shaft, wherein the spiral blades are in contact with the inner wall of the metering section of the spiral conveying pipe, and a distance is left between the inner wall of the control section and the spiral blades; The inner wall of the control section of the spiral conveying pipe is provided with a receiving plate and a pressing plate which slide up and down, the spiral blade is located between the receiving plate and the pressing plate, the pressing plate is located above the receiving plate, the outer wall of the spiral conveying pipe is provided with a driving source for driving the pressing plate to move up and down, when the pressing plate moves downward, the pressing plate squeezes the fly ash in the control section, and the pressing plate squeezes the receiving plate to move downward, and a reset member for driving the receiving plate to reset upward is installed in the spiral conveying pipe; A discharge pipe is connected to the side wall of the control section away from the metering section, and the discharge pipe is connected to the heat treatment concentration chamber. When the receiving plate is reset, it blocks the discharge pipe from being connected to the control section. After being pressed down, the receiving plate is lower than the outlet of the discharge pipe. The control section is equipped with a soot blowing pipe for inert gas to enter, and the air outlet end of the soot blowing pipe is close to the pressure plate and connected to the control section.

[0008] By adopting the above technical solution, the spiral conveying pipe of the spiral feeder is divided into a feeding section, a metering section and a control section. This segmented design makes the conveying process of fly ash more precise and controllable; the feeding section is connected with the temporary ash storage bin to ensure the stable supply of fly ash; the metering section realizes the precise metering of the fly ash conveying amount through the contact between the spiral blade and the inner wall; the control section realizes the compaction and timed discharge of fly ash through the cooperation of the pressure plate and the receiving plate, thereby improving the efficiency and accuracy of fly ash treatment; The oxygen content of the compacted fly ash is reduced. After being sent into the discharge pipe by the inert gas, the inert gas can further displace the oxygen content, and the oxygen content in the fly ash entering the discharge pipe can be further reduced, thereby improving the control degree of the fly ash oxygen content, allowing the fly ash to undergo low-temperature thermal decomposition reaction under the absence of oxygen or oxygen, thereby achieving low-power and high-efficiency removal of dioxins in the fly ash; The pressure plate and the receiving plate slide up and down in the control section of the spiral conveying pipe. Driven by the driving source, the pressure plate can move downward to squeeze the fly ash and push the receiving plate to move downward; when the pressure plate rises, the receiving plate is reset under the action of the reset member, thereby controlling the opening and closing of the discharge pipe; this mechanism ensures the stable compaction and discharge of the fly ash and avoids blockage of the fly ash during the transportation process.

[0009] Optionally, the spiral blade located in the control section is provided with a hollow portion The adoption of the above technical solution is helpful to reduce the accumulation of fly ash on the blades. At the same time, the hollow portion can also increase the flow area of ​​the inert gas and improve the purging effect of the inert gas on the fly ash.

[0010] Optionally, the control section is provided with a guide plate inclined downward, and the lower end of the guide plate is close to the pressure plate.

[0011] By adopting the above technical solution, the downward inclined guide plate installed in the control section can guide the fly ash to flow toward the receiving plate more smoothly.

[0012] Optionally, the metering section is provided with a guide groove having a guide surface inclined downward, and the upper end of the guide plate is connected with the upper end of the guide surface.

[0013] By adopting the above technical solution, the guide groove plays a certain buffering role, reducing the situation where the inert gas is directly blown to the fly ash in the metering section.

[0014] Optionally, the reset member is a connecting rod, one end of which is fixedly connected to the pressure plate, and the other end of the connecting rod passes through the receiving plate and is connected to a limiting block, and the receiving plate and the connecting rod are in sliding contact.

[0015] By adopting the above technical solution, when the pressure plate moves downward, the receiving plate is indirectly pushed by the fly ash. When the pressure plate moves upward, the connecting rod pulls the receiving plate upward to reset through the limit block, thereby controlling the opening and closing of the discharge pipe.

[0016] Optionally, the soot blowing pipe is a square pipe, one end of the soot blowing pipe extends out of the control section and is connected to an air inlet pipe, and the air inlet pipe is connected to an inert gas storage tank and an air pump.

[0017] By adopting the above technical solution, the soot blowing pipe and its ventilation groove adopt a rectangular structure design, which can ensure that the inert gas is more evenly distributed in the fly ash during the transportation process, thereby improving the blowing effect.

[0018] Optionally, the receiving plate is arranged to be inclined downward, and the lower end of the receiving plate is close to the discharge pipe.

[0019] By adopting the above technical solution, the receiving plate is arranged downwardly in an inclined manner, with the lower end close to the discharge pipe. This design can ensure that the fly ash can smoothly enter the discharge pipe after compaction, and avoid the accumulation and blockage of the fly ash on the receiving plate.

[0020] In the second aspect, the present application provides a method for treating fly ash from incineration of domestic waste, which adopts the following technical solution: A method for treating fly ash from incineration of domestic waste is provided. The method is carried out according to the above-mentioned low-temperature pyrolysis device for treating fly ash from incineration of domestic waste. Fly ash from temporary storage bin enters into a spiral feeder in succession. The spiral blades continuously convey fly ash into a control section along with the rotation of a rotating shaft. A pressure plate is driven to be pressed down intermittently according to the conveying time or the conveying amount of fly ash. When the pressure plate presses down the fly ash, the rotating shaft stops rotating. The cooperation between the pressure plate and a receiving plate compacts the fly ash in the control section. When the receiving plate abuts against the bottom wall of the control section, inert gas is sprayed into the control section through an ash blowing channel. The inert gas pushes the fly ash into a discharge pipe.

[0021] By adopting the above technical solution, the fly ash is stably transported to the control section through the screw feeder, and the pressure plate is driven to press down intermittently according to the fly ash transportation time or transportation amount. This treatment method not only improves the efficiency and accuracy of fly ash treatment, but also reduces the oxygen content in the fly ash. The inert gas pushes the fly ash into the discharge pipe. This design can not only reduce the risk of blockage of fly ash during transportation, but also ensure that the fly ash is in an inert atmosphere during the low-temperature pyrolysis process, further reducing the reaction of fly ash with oxygen in the air to form dioxins.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. The oxygen content of the compacted fly ash is reduced. After being sent into the discharge pipe by inert gas, the inert gas can further displace the oxygen content, and the oxygen content in the fly ash entering the discharge pipe can be further reduced, thereby improving the control degree of the fly ash oxygen content, so that the fly ash can undergo low-temperature thermal decomposition reaction under the condition of lack of oxygen or oxygen-free, and realize the low-power and high-efficiency removal of dioxins in the fly ash. The dioxin decomposition efficiency is high, and the dioxin removal rate is greater than 95%, which can meet the requirements of subsequent resource utilization; 2. The matching design between the pressure plate and the receiving plate controls the opening and closing of the discharge pipe, ensuring the stable compaction of the fly ash and its discharge into the discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 This is a schematic diagram of the overall external structure of the spiral feeder embodied in the embodiment of the present application; Figure 3 This is a cross-sectional view of the internal overall structure of the spiral feeder embodied in the embodiment of the present application; Figure 4 is a cross-sectional view showing the position of the connecting rod in the embodiment of the present application; Figure 5 yes Figure 3 An enlarged schematic diagram of point A.

[0024] Explanation of the reference numerals: 100, temporary ash storage bin; 200, spiral feeder; 210, spiral conveying pipe; 211, feeding section; 212, metering section; 213, control section; 214, receiving plate; 215, pressure plate; 216, connecting rod; 217, limit block; 218, guide plate; 219, guide surface; 220, rotating shaft; 230, spiral blade; 231, hollow part; 300, heat treatment concentration chamber; 400, discharge pipe; 500, soot blowing duct; 510, ventilation groove; 520, air inlet pipe; 600, exhaust gas dust collector; 700, primary water-cooling spiral; 800, secondary water-cooling spiral. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-5 This application is described in further detail.

[0026] The present application discloses a low-temperature pyrolysis device for fly ash from the incineration of domestic waste. Figure 1 A low-temperature pyrolysis device for fly ash from incineration of domestic waste includes a temporary ash bin 100, a screw feeder 200, and a heat treatment concentration chamber 300. A gate valve (not shown in the figure) is arranged between the lower end of the temporary ash bin 100 and the screw feeder 200. The gate valve is opened and closed to control whether the fly ash in the temporary ash bin 100 falls into the spiral conveying pipe 210. The side wall of the screw feeder 200 away from the temporary ash bin 100 is connected to a discharge pipe 400, and the discharge pipe 400 is connected to the heat treatment concentration chamber 300.

[0027] Reference Figure 1 and Figure 2 , a two-stage feed air lock (not shown in the figure) is installed on the discharge pipe 400. The end where the discharge pipe 400 is connected to the spiral conveying pipe 210 is in the shape of a square tube, which is convenient for the fly ash to leave the spiral feeder 200. The end of the discharge pipe 400 entering the heat treatment concentration chamber 300 can be connected to a round tube to adapt to the air lock installation. The main function of the feed air lock is to ensure that the material can flow stably and continuously during the input process, while preventing gas backflow or leakage. The low-temperature pyrolysis device also includes a primary water-cooling spiral 700 and a secondary water-cooling spiral 800. The heat treatment concentration chamber 300 is connected to a tail gas dust collector 600. The fly ash enters the closed space for treatment from entering the temporary ash storage bin 100. The fly ash treated in the heat treatment concentration chamber 300 is discharged after passing through the primary water-cooling spiral 700 and the secondary water-cooling spiral 800 in turn. The present application mainly aims at improving the screw feeder 200 to reduce the oxygen content of the fly ash before it enters the heat treatment concentration chamber 300. The other parts mainly adopt conventional technical means, which will not be elaborated in this application.

[0028] Reference Figure 3 Specifically, the screw feeder 200 includes a screw conveying pipe 210 and a rotating shaft 220 rotatably installed in the screw conveying pipe 210. The rotating shaft 220 extends along the length direction of the screw conveying pipe 210, and the rotating shaft 220 is distributed with a spiral blade 230. The screw conveying pipe 210 includes a feeding section 211, a metering section 212, and a control section 213 in sequence. The feeding section 211 is used to communicate with the temporary ash storage bin 100. The spiral blade 230 contacts the inner wall of the metering section 212 and the feeding section 211 when rotating. The metering section 212 is the main conveying section, so that the spiral blade 230 continuously conveys the fly ash from the feeding section 211 to the control section 213.

[0029] Reference Figure 2 and Figure 3The feeding section 211 and the metering section 212 are both cylindrical in structure, and the feeding section 211 and the metering section 212 are integrally formed. The control section 213 is a box body with a rectangular structure, and a gap is left between the inner wall of the control section 213 and the spiral blade 230. The control section 213 continuously receives fly ash, so that the fly ash is first accumulated on the control section 213.

[0030] Reference Figure 3 Specifically, a receiving plate 214 and a pressing plate 215 are slid up and down on the inner wall of the control section 213. The receiving plate 214 serves to receive the fly ash in the control section 213. The upper surface of the receiving plate 214 is lower than the inner wall of the metering section 212. The pressing plate 215 is located above the receiving plate 214, and the spiral blade 230 is located between the pressing plate 215 and the receiving plate 214. A driving source for driving the pressing plate 215 to move up and down is installed on the outer side of the spiral conveying pipe 210. The driving source is a cylinder. The piston rod of the cylinder extends into the control section 213 and is in sealing and sliding contact with the control section 213. The piston rod and the pressing plate 215 are fixedly connected. The control section 213 has a movable cavity for the receiving plate 214 to slide up and down. When a certain amount of fly ash accumulates in the control section 213, the pressing plate 215 compacts the fly ash and squeezes the oxygen content in the fly ash. After the fly ash is compacted, it continues to be pressed downward, and the pressing plate 215 indirectly drives the receiving plate 214 to move downward.

[0031] A reset member is installed in the spiral conveying tube 210 to drive the receiving plate 214 to reset upward. When the receiving plate 214 is reset, it blocks the discharge pipe 400 from being connected with the control section 213. During the process of the receiving plate 214 being pressed downward, the discharge pipe 400 is gradually connected with the control section 213 until the receiving plate 214 is completely lower than the pipe mouth of the discharge pipe 400.

[0032] Reference Figure 3 and Figure 4 More specifically, the reset member may be a connecting rod 216, the upper end of the connecting rod 216 is fixedly connected to the pressing plate 215, and the lower end of the connecting rod 216 passes through the receiving plate 214 and is connected to the limiting block 217. When the pressing plate 215 presses the fly ash downward, the connecting rod 216 and the receiving plate 214 are in sliding contact, and the pressing plate 215 continues to press the receiving plate 214 after compacting the fly ash. When the pressing plate 215 moves upward, the connecting rod 216 drives the receiving plate 214 to reset through the limiting block 217, and the receiving plate 214 continues to receive the fly ash and prevent the discharge pipe 400 from being connected to the control section 213.

[0033] Reference Figure 4 and Figure 5In order to allow the fly ash to smoothly enter the discharge pipe 400, the control section 213 is fixedly installed with a soot blowing pipe 500. The soot blowing pipe 500 is a square pipe. The cross section of the soot blowing pipe 500 is a rectangular structure. The ventilation groove 510 of the soot blowing pipe 500 is also a rectangular structure. The outlet end of the blowing channel is close to the pressing plate 215. The pressing plate 215 and the outer surface of the soot blowing pipe 500 are in contact with each other. The part of the soot blowing pipe 500 extending out of the control section 213 is connected to an air inlet pipe 520. There are multiple air inlet pipes 520 distributed at intervals. The multiple air inlet pipes 520 are all connected to an inert gas storage tank. The inert gas is preferably nitrogen. The air inlet pipe 520 is connected to an air pump that drives inert gas into the soot blowing channel. When the air pump is started, multiple air inlet pipes 520 simultaneously introduce high-pressure inert gas into the soot blowing pipe 500. The high-pressure inert gas forms an air wall after passing through the soot blowing pipe 500. The inert gas continuously blows fly ash into the air inlet pipe 520, further reducing the oxygen content of the fly ash when it enters the discharge pipe 400.

[0034] When the inert gas blows away the ash, the rotating shaft 220 stops rotating. The motor that drives the rotating shaft 220 to rotate and the air pump can be electrically connected to achieve that the air pump is turned off when the motor is turned on, and the motor is turned off when the air pump is turned on. The movable cavity of the control room is equipped with a sensor that senses the sliding position of the receiving plate 214. When the receiving plate 214 slides down and the discharge pipe 400 is connected to the control section 213, the sensor transmits a signal to the air pump, and the air pump is turned on and the motor is turned off. The specific connection principle between the sensor, the air pump and the motor is prior art, and this application will not elaborate on it.

[0035] In order to make the inert gas blow the fly ash more smoothly, the spiral blade 230 located below the control section 213 and the soot blowing pipe 500 is provided with hollow parts 231, which are through holes, so that the gas wall formed by the inert gas can smoothly penetrate the spiral blade 230. The fly ash may also agglomerate, and when the hollow part 231 of the spiral blade 230 contacts the fly ash, the agglomerated fly ash can be squeezed and crushed, so that when the fly ash is subsequently squeezed, the compaction degree of the fly ash is improved, and the oxygen content between the fly ashes can be further reduced.

[0036] Reference Figure 5 In the process of the pressing plate 215 compacting the fly ash, the rotating shaft 220 rotates continuously, and the fly ash accumulates in the metering section 212. The control section 213 is equipped with an inclined guide plate 218. The lower end of the guide plate 218 is close to the pressing plate 215, and the pressing plate 215 is located below the guide plate 218. When the inert gas blows toward the pressing plate 215, the pressing plate 215 guides the gas to blow downward, so that the fly ash can better enter the discharge pipe 400.

[0037] Reference Figure 5Furthermore, a guide groove is provided on the inner wall of one end of the metering section 212 close to the control section 213, and the guide groove has a guide surface 219 inclined downward, and the upper end of the guide surface 219 is connected with the upper end of the guide plate 218, and the guide surface 219 and the guide plate 218 form an inverted V-shaped guide structure. The inert gas under high pressure hits the connection between the upper end of the guide surface 219 and the upper end of the guide plate 218, guiding the gas to blow downward, and can also have the effect of blowing the fly ash of the metering section 212 in the opposite direction, so that a large amount of compacted fly ash enters the discharge pipe 400, and a small amount of fly ash in the metering section 212 enters.

[0038] Furthermore, the receiving plate 214 is also arranged to be inclined downward, and the lower end of the receiving plate 214 is close to the discharge pipe 400, which can also play the role of guiding the inert gas.

[0039] The implementation principle of a low-temperature pyrolysis device for domestic waste incineration fly ash in the embodiment of the present application is as follows: The fly ash low-temperature pyrolysis device allows fly ash to decompose dioxins at low temperatures (300-500°C) without high temperatures, saving energy consumption. The fly ash is first collected and stored in the temporary ash bin 100, and the fly ash is transported from the temporary ash bin 100 through the screw feeder 200. The screw feeder 200 consists of a rotating shaft 220 and a spiral blade 230. Through the rotation of the rotating shaft 220, the spiral blade 230 transports the fly ash from the feeding section 211 to the metering section 212 and the control section 213. The design of the screw feeder 200 ensures the stable transportation of the fly ash. In the control section 213 of the spiral conveying pipe 210, the pressing plate 215 and the receiving plate 214 slide up and down through the drive of the driving source. When the pressing plate 215 moves downward, it squeezes the fly ash in the control section 213 and pushes the receiving plate 214 to move downward. This compaction effect not only helps to reduce the volume of fly ash, but also increases the density and oxygen content of fly ash. The inert gas pushes the fly ash into the discharge pipe 400. This injection effect not only helps to reduce the risk of blockage of fly ash during transportation, but also ensures that the fly ash is in an inert atmosphere during the low-temperature pyrolysis process. This can achieve low-power and high-efficiency removal of dioxins in fly ash. The dioxin removal rate is greater than 95%, which meets the comprehensive utilization of fly ash resources at the back end.

[0040] The embodiment of the present application also discloses a method for treating fly ash from the incineration of domestic waste.

[0041] A method for treating fly ash from incineration of domestic waste is provided. The method is carried out according to the above-mentioned low-temperature pyrolysis device for treating fly ash from incineration of domestic waste. The fly ash in the temporary storage bin gradually enters into the spiral feeder 200. The spiral blade 230 rotates with the rotating shaft 220 to continuously transport the fly ash into the control section 213. The pressure plate 215 is driven to press down intermittently according to the fly ash conveying time or conveying amount. When the pressure plate 215 presses down the fly ash, the rotating shaft 220 stops rotating. The cooperation between the pressure plate 215 and the receiving plate 214 has a compacting effect on the fly ash in the control section 213. When the receiving plate 214 abuts against the inner bottom wall of the control section 213, the inert gas is sprayed into the control section 213 through the soot blowing channel, and the inert gas pushes the fly ash into the discharge pipe 400.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low-temperature pyrolysis device for fly ash from the incineration of domestic waste, comprising a temporary ash storage bin (100), a spiral feeder (200) and a heat treatment concentration chamber (300), characterized in that: The spiral conveying pipe (210) of the spiral feeder (200) comprises a feeding section (211), a metering section (212) and a control section (213) in sequence; the feeding section (211) is connected to the temporary ash storage bin (100); a rotating shaft (220) is rotatably installed in the spiral conveying pipe (210); spiral blades (230) are distributed on the rotating shaft (220); the spiral blades (230) are in contact with the inner wall of the metering section (212) of the spiral conveying pipe (210); and a distance is left between the inner wall of the control section (213) and the spiral blades (230); A receiving plate (214) and a pressing plate (215) are slidably mounted on the inner wall of the control section (213) of the spiral conveying pipe (210), the spiral blade (230) is located between the receiving plate (214) and the pressing plate (215), the pressing plate (215) is located above the receiving plate (214), and a driving source for driving the pressing plate (215) to move up and down is installed on the outer wall of the spiral conveying pipe (210); when the pressing plate (215) moves downward, the pressing plate (215) presses the receiving plate (214) to move downward until the receiving plate (214) abuts against the inner bottom wall of the control section (213); and a resetting member for driving the receiving plate (214) to return upward is installed in the spiral conveying pipe (210); A discharge pipe (400) is connected to the side wall of the control section (213) away from the metering section (212), and the discharge pipe (400) is connected to the heat treatment concentration chamber (300). When the receiving plate (214) is reset, it blocks the discharge pipe (400) from being connected to the control section (213). After being pressed down, the receiving plate (214) is lower than the pipe mouth of the discharge pipe (400). The control section (213) is equipped with a soot blowing pipe (500) for allowing inert gas to enter, and the gas outlet end of the soot blowing pipe (500) is close to the pressure plate (215) and is connected to the control section (213).

2. A low-temperature pyrolysis device for fly ash from incineration of domestic waste according to claim 1, characterized in that: The spiral blade (230) located in the control section (213) is provided with hollow portions (231).

3. A low-temperature pyrolysis device for fly ash from incineration of domestic waste according to claim 2, characterized in that: The control section (213) is provided with a guide plate (218) inclined downward, and the lower end of the guide plate (218) is close to the pressure plate (215).

4. A low-temperature pyrolysis device for fly ash from incineration of domestic waste according to claim 3, characterized in that: The metering section (212) is provided with a guide groove, the guide groove having a guide surface (219) inclined downward, and the upper end of the guide plate (218) is connected to the upper end of the guide surface (219).

5. The low-temperature pyrolysis device for fly ash from incineration of domestic waste according to claim 1, characterized in that: The reset member is a connecting rod (216), one end of the connecting rod (216) is fixedly connected to the pressing plate (215), the other end of the connecting rod (216) passes through the receiving plate (214) and is connected to a limiting block (217), and the receiving plate (214) and the connecting rod (216) are in sliding contact.

6. The low-temperature pyrolysis device for fly ash from incineration of domestic waste according to claim 1, characterized in that: The soot blowing pipe (500) is a square pipe, one end of the soot blowing pipe (500) extends out of the control section (213) and is connected to an air intake pipe (520), and the air intake pipe (520) is connected to an inert gas storage tank and an air pump.

7. The low-temperature pyrolysis device for fly ash from incineration of domestic waste according to claim 1, characterized in that: The receiving plate (214) is arranged to be inclined downward, and the lower end of the receiving plate (214) is close to the discharge pipe (400).

8. A method for treating fly ash from incineration of domestic waste, comprising treating fly ash from incineration of domestic waste using a low-temperature pyrolysis device according to any one of claims 1 to 7, characterized in that: The fly ash in the temporary storage bin gradually enters the spiral feeder (200), and the spiral blade (230) continuously transports the fly ash into the control section (213) along with the rotation of the rotating shaft (220). The pressure plate (215) is driven to press down intermittently according to the fly ash conveying time or conveying amount. When the pressure plate (215) presses down the fly ash, the rotating shaft (220) stops rotating. The cooperation between the pressure plate (215) and the receiving plate (214) has a compacting effect on the fly ash in the control section (213). When the receiving plate (214) abuts against the inner bottom wall of the control section (213), inert gas is sprayed into the control section (213) through the ash blowing channel, and the inert gas pushes the fly ash into the discharge pipe (400).

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