Powder sealing conveying valve and fly ash detoxification system

Abstract

This invention discloses a powder sealing conveying valve and a fly ash detoxification system. The powder sealing conveying valve includes an outer shell, an inner rotating cylinder, a guide hopper, a mandrel, a power input component, and two hollow frames. The outer shell, inner rotating cylinder, and mandrel are all vertically arranged and coaxially distributed from the outside to the inside. The inner rotating cylinder is rotatably connected to the outer shell. Spiral blades are arranged around the mandrel on the inner wall of the inner rotating cylinder. The guide hopper is trumpet-shaped and is vertically arranged at the upper inner end of the outer shell. The smaller end of the guide hopper's opening faces downward and extends into the inner rotating cylinder. The two hollow frames are respectively arranged at both ends of the mandrel. The upper hollow frame is connected to the guide hopper, and the lower hollow frame is connected to the lower inner end of the outer shell. The power input component is arranged on the outer shell and is drivenly connected to the inner rotating cylinder. Its structure is simple and can convey powder from top to bottom or stop conveying.

Description

Technical Field

[0001] This invention belongs to the field of waste incineration technology, and particularly relates to a powder sealing conveying valve and a fly ash detoxification system. Background Technology

[0002] While waste incineration achieves the reduction, harmlessness, and resource recovery of municipal solid waste, it inevitably generates secondary pollutants such as fly ash, SO2, NOx, and acidic gases like HCl. Fly ash from waste incineration contains not only soluble and insoluble salts, but also various heavy metals and toxic and harmful pollutants such as dioxins. Therefore, waste incineration fly ash is classified as hazardous waste and requires safe handling and disposal.

[0003] The harmless treatment and resource utilization of waste fly ash are inseparable from the separation, detoxification, and stabilization of its toxic and harmful components. Dioxins, as persistent organic pollutants (POPs), are one of the main toxic and harmful substances in waste incineration fly ash. Whether for harmless treatment or resource utilization, dioxins in fly ash must be properly treated. During high-temperature melting or co-processing in cement kilns, dioxins in fly ash are completely decomposed under high-temperature conditions. In addition, photocatalysis, hydrothermal treatment, and low-temperature thermal treatment can also effectively degrade dioxins in fly ash. Among these methods, low-temperature thermal treatment has received widespread attention and application in recent years due to its advantages such as lower detoxification operating temperature, lower secondary dioxin synthesis, lower energy consumption, and ease of engineering application. However, the current low-temperature thermal detoxification process for dioxins in fly ash requires strict requirements such as air isolation (oxygen-deficient or anaerobic environment), continuous medium-temperature detoxification environment, and ash temperature after detoxification. It has many problems such as complex process system and high energy consumption per unit mass of fly ash. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, one of the objectives of the present invention is to provide a powder sealing conveying valve that can adjust the ash feeding rate and prevent material blockage, while having good airtightness.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A powder sealing conveying valve includes an outer shell, an inner rotating cylinder, a guide hopper, a mandrel, a power input component, and two hollow frames. The outer shell, inner rotating cylinder, and mandrel are all vertically arranged, and the inner rotating cylinder is located in the inner middle of the outer shell and is coaxially rotatably connected to the outer shell. The mandrel is coaxially placed inside the inner rotating cylinder. Helical blades are vertically arranged around the mandrel on the inner wall of the inner rotating cylinder, and the inner edge of the helical blades extends close to the mandrel and can rotate relative to the mandrel under the drive of the inner rotating cylinder. The guide hopper is funnel-shaped and is vertically arranged in the upper inner part of the outer shell and above the inner rotating cylinder. The opening of the guide hopper... The larger end faces upward and is connected to the upper end of the outer casing. The smaller end of the guide hopper faces downward and extends into the inner rotating cylinder. Two hollow frames are respectively set at both ends of the mandrel. The upper hollow frame is connected to the guide hopper, and the lower hollow frame is connected to the lower inner end of the outer casing. The power input component is set on the outer casing and is connected to the inner rotating cylinder. The power input end of the power input component extends out of the outer casing. The power input component is used to receive external power and drive the inner rotating cylinder to rotate relative to the outer casing and the mandrel. When the inner rotating cylinder rotates relative to the mandrel, it discharges the powder from top to bottom, or when the inner rotating cylinder stops rotating, it stops discharging the powder from top to bottom.

[0006] The beneficial effects of the above technical solution are as follows: by arranging the outer casing, inner rotating cylinder, and mandrel sequentially from the outside to the inside, with the outer casing and mandrel relatively stationary, while the inner rotating cylinder and its internal spiral blades can rotate relative to the outer casing and mandrel under the power transmission of the power input component, the inner rotating cylinder and its internal spiral blades together with the mandrel are equivalent to a screw conveyor to transport powder from top to bottom. The outer casing serves as the carrier for installing the inner rotating cylinder and mandrel, and also plays a sealing role in the entire powder conveying valve. In addition, the guide hopper can gather the powder entering the outer casing and transport it into the inner rotating cylinder. When the inner rotating cylinder rotates, it can transport powder downwards, and adjusting the rotation speed of the inner rotating cylinder can also adjust the downward feeding rate. When the inner rotating cylinder stops running, the downward feeding stops.

[0007] In the above technical solution, the outer shell and the inner rotating cylinder are coaxially distributed and have an annular gap between them. Multiple bearing components are spaced apart in the vertical direction within the annular gap, and the inner rotating cylinder is coaxially rotatably connected to the outer shell through the multiple bearing components.

[0008] The beneficial effect of the above technical solution is that it allows the outer sleeve and the inner rotating cylinder to be rotatably connected through bearing components, making their rotation more stable.

[0009] In the above technical solution, bearing sealing rings are respectively provided at both ends of the annular gap and fixedly connected to the outer casing. The inner edge of the bearing sealing ring has an annular gap with the inner rotating cylinder or is coaxially rotatably connected to the inner rotating cylinder to seal both ends of the annular gap.

[0010] The beneficial effect of the above technical solution is that the bearing sealing ring can seal both ends of the annular gap to prevent dust from entering the annular gap and causing the bearing components to jam.

[0011] The power input component described in the above technical solution includes a bevel gear ring, a bevel gear, and a power input shaft. The bevel gear ring is located within the annular gap and is coaxially fixedly installed on the outer wall of the inner rotating cylinder. The power input shaft penetrates the outer casing radially and is rotatably connected to the outer casing, and is close to the bevel gear ring. The bevel gear is coaxially fixedly installed on the end of the power input shaft located within the annular gap, and the bevel gear meshes with the bevel gear ring. The end of the power input shaft located outside the outer casing constitutes the power input end of the power input component.

[0012] The beneficial effect of the above technical solution is that it enables the power input shaft to drive the bevel gear ring to rotate via the bevel gear, and the bevel gear ring in turn drives the inner rotating cylinder to rotate.

[0013] The above technical solution also includes multiple ring sleeves, which are all sleeved on the outside of the outer shell and vertically spaced on the outer shell. Each ring sleeve corresponds to a different bearing component, and each ring sleeve is horizontally aligned with the corresponding bearing component. Each ring sleeve has a coolant inlet and a coolant outlet, and coolant is introduced into the ring sleeve to cool the bearing component.

[0014] The beneficial effects of the above technical solution are as follows: Since the bearing components generate heat when rotating, and the fly ash also conducts heat to the bearing components when passing through the inner rotating cylinder, by fitting a ring sleeve on the outer wall of the outer casing, and the ring sleeve corresponding to and aligned with the bearing components, cooling water can be introduced into the ring sleeve to dissipate heat at the position of the bearing component on the outer casing.

[0015] The above technical solution also includes two flange rings, which are respectively disposed on the outer sides of both ends of the outer casing.

[0016] The beneficial effect of the above technical solution is that it allows the two ends of the outer casing to be connected by flange rings, which makes its sealing performance better.

[0017] The second objective of this invention is to provide a fly ash detoxification system that is simple in structure and can efficiently detoxify fly ash at low temperatures in a sealed state.

[0018] To achieve the above objectives, the technical solution of the present invention is as follows: A fly ash detoxification system includes a fly ash detoxification tank, a fly ash cooling tank, a protective gas storage device, and two pressure balancers. Both the fly ash detoxification tank and the fly ash cooling tank are vertically arranged, with the fly ash cooling tank located below the fly ash detoxification tank. Both the fly ash detoxification tank and the fly ash cooling tank have an ash inlet, a protective gas inlet, a pressure balancer port, and an ash outlet. A first valve is provided at the ash inlet of the fly ash detoxification tank. The ash outlet of the fly ash detoxification tank communicates with the ash inlet of the fly ash cooling tank, and a second valve is provided at the connection point. A third valve is provided at the ash outlet of the fly ash cooling tank. The first valve, the second valve, and the third valve are all powder sealing conveying valves as described above. The fly ash detoxification tank is equipped with a heating device for heating the fly ash inside. The fly ash cooling tank is equipped with a cooling device for cooling the fly ash after waste heat recovery. The pressure balance ports of the fly ash detoxification tank and the fly ash cooling tank are respectively connected to the gas inlet and outlet of the corresponding pressure balancer, and a fourth valve is provided at the connection point. The protective gas inlet of the fly ash detoxification tank and the protective gas inlet of the fly ash cooling tank are both connected to the outlet of the protective gas storage device, and a fifth valve is provided at the connection point. The two pressure balancers are used to stabilize the pressure inside the fly ash detoxification tank and the fly ash cooling tank, respectively.

[0019] The beneficial effects of the above technical solution are as follows: First, the first valve can be opened, while the second and third valves are closed, allowing fly ash to be fed into the fly ash detoxification tank. At this time, the heating device heats the fly ash in the detoxification tank to 380-400℃ and maintains it for the set detoxification time, during which the dioxins in the fly ash undergo pyrolysis. After detoxification in the detoxification tank, the fly ash is sent to the fly ash cooling tank via the second valve for waste heat recovery and cooling. After the fly ash in the detoxification tank is emptied, new fly ash can be promptly fed in. Meanwhile, the fly ash in the cooling tank is cooled by waste heat recovery and cooling devices until it is cooled to a suitable temperature. Once the fly ash inside the tank is cooled to below 60°C, the third valve can be opened to discharge it. Since the fly ash cooling tank and the fly ash detoxification tank can operate simultaneously, their operating efficiency is high. During operation, in order to avoid air leakage caused by internal pressure fluctuations, pressure balancers can be installed separately to keep the pressure inside the fly ash detoxification tank and the fly ash cooling tank stable, thereby minimizing gas exchange with the outside environment. In addition, protective gas storage devices periodically supply protective gas to the fly ash detoxification tank and the fly ash cooling tank, so that the fly ash is detoxified and cooled under a protective gas atmosphere.

[0020] The above technical solution also includes a heat transfer fluid storage tank. The heating device is a heating coil with an inlet and an outlet at its two ends. The heat transfer fluid storage tank is provided with a replenishment port, an outlet, and a return port. The heat transfer fluid storage tank is also provided with an electric heating element for heating the heat transfer fluid in the tank. The outlet and return port of the heat transfer fluid storage tank are connected to the two ends of the heating device. A sixth valve is provided at the outlet of the heat transfer fluid storage tank, and a seventh valve is provided at the return port. A circulation pump is provided at the inlet of the heating device.

[0021] The beneficial effects of the above technical solution are as follows: the heat transfer fluid can be stored in the heat transfer fluid storage tank and heated. The heated heat transfer fluid is then sent to the heating device to heat the fly ash. During the heating process, the heat transfer fluid circulates between the heating device and the heat transfer fluid storage tank.

[0022] The fly ash cooling tank described in the above technical solution is also equipped with a waste heat recovery coil. The two ends of the waste heat recovery coil are the liquid inlet and the liquid outlet, respectively. The liquid inlet of the waste heat recovery coil is connected to the liquid outlet of the heating device, and the liquid outlet of the waste heat recovery coil is connected to the liquid inlet of the heating device. An eighth valve is provided at the liquid inlet of the waste heat recovery coil, and a ninth valve is provided at the liquid outlet of the waste heat recovery coil.

[0023] The beneficial effects of the above technical solution are as follows: Hot ash in the fly ash detoxification tank can be discharged into the fly ash cooling tank. After fresh cold ash is added to the fly ash detoxification tank, the heat transfer fluid can be circulated between the waste heat recovery coil and the heating device beforehand. This allows the heat transfer fluid to carry away the heat from the hot ash in the fly ash cooling tank during circulation, preheating the cold ash in the fly ash detoxification tank. When the temperatures of the fly ash in the fly ash cooling tank and the fly ash detoxification tank are similar, the heat transfer fluid storage tank can then independently circulate and supply heat transfer fluid to the heating device to continue heating the fly ash in the fly ash detoxification tank. Meanwhile, the fly ash in the fly ash cooling tank is further cooled by the cooling device. This allows for full utilization of the heat carried by the fly ash in the fly ash cooling tank.

[0024] The cooling device described in the above technical solution is a cooling coil with an inlet and an outlet, respectively. Cooling liquid is introduced into the cooling device to cool the fly ash in the fly ash cooling tank.

[0025] The beneficial effect of the above technical solution is that it allows the cooling device to be directly supplied with coolant to cool the fly ash in the fly ash cooling tank. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the powder sealing conveying valve described in Embodiment 1 of the present invention;

[0027] Figure 2 This is a top view of the hollow frame described in Embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the fly ash detoxification system described in Embodiment 2 of the present invention;

[0029] Figure 4 This is a schematic diagram of the air pressure balancer described in Embodiment 2 of the present invention;

[0030] Figure 5 This is a schematic diagram of the air pressure balancer described in Embodiment 3 of the present invention;

[0031] Figure 6 This is a schematic diagram of the fly ash detoxification system described in Embodiment 3 of the present invention;

[0032] Figure 7 This is a schematic diagram of the electrical connections of the controller described in Embodiment 3 of the present invention.

[0033] In the diagram: 1. Outer sleeve; 11. Pallet; 2. Inner rotating cylinder; 21. Spiral blade; 22. Support plate; 3. Guide hopper; 4. Mandrel; 41. Anti-caking nail; 5. Power input component; 51. Bevel gear ring; 52. Bevel gear; 53. Power input shaft; 6. Hollow frame; 61. Outer ring; 62. Inner ring; 63. Support rod; 7. Bearing component; 71. Bearing sealing ring; 8. Ring sleeve; 81. Coolant inlet; 82. Coolant outlet; 9. Flange ring; 10. Fly ash detoxification tank; 101. Heating device; 102. Circulating pump; 20. Fly ash cooling tank; 201. Cooling device; 202. Waste heat recovery coil; 30. Protective gas storage device; 40. Pressure balancer; 401. Tank body; 401a. Upper chamber; 401b. Lower chamber; 4011. Gas breathing interface; 401 2. Exhaust port; 4013. Drain port; 4014. Return port; 4015. Liquid inlet port; 4016. Liquid outlet port; 4017. Pressure balance port; 402. Intermediate partition; 403. Water pump; 404. Exhaust gas filter; 405. Eleventh valve; 406. Twelfth valve; 407. Thirteenth valve; 408. Fourteenth valve; 409. Liquid level monitoring element; 501. First valve; 502. Second valve; 503. Third valve; 504. Fourth valve; 505. Fifth valve; 506. Sixth valve; 507. Seventh valve; 508. Eighth valve; 509. Ninth valve; 510. Tenth valve; 60. Heat transfer fluid storage tank; 601. Electric heating element; 70. Temperature monitoring element; 80. Pressure monitoring element; 90. Controller. Detailed Implementation

[0034] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0035] Example 1

[0036] like Figure 1As shown, this embodiment provides a powder sealing conveying valve, including an outer sleeve 1, an inner rotating cylinder 2, a guide hopper 3, a mandrel 4, a power input component 5, and two hollow frames 6. The outer sleeve 1, the inner rotating cylinder 2, and the mandrel 4 are all vertically arranged, and the inner rotating cylinder 2 is located in the inner middle of the outer sleeve 1. The inner rotating cylinder 2 is coaxially rotatably connected to the outer sleeve 1. The mandrel 4 is coaxially placed inside the inner rotating cylinder 2. A spiral blade 21 is vertically arranged around the mandrel 4 on the inner wall of the inner rotating cylinder 2, and the inner edge of the spiral blade 21 extends close to the mandrel 4 (the inner edge of the spiral blade and the mandrel are close). There is a gap between the shaft walls (the gap can be about 1mm), and it can rotate relative to the mandrel 4 under the drive of the inner rotating cylinder 2. The guide hopper 3 is trumpet-shaped and is vertically arranged at the upper inner end of the outer casing 1, and located above the inner rotating cylinder 2. The larger end of the opening of the guide hopper 3 faces upward and is connected to the upper end of the outer casing 1. The smaller end of the opening of the guide hopper 3 faces downward and extends into the inner rotating cylinder 2. The two hollow frames 6 are respectively arranged at both ends of the mandrel 4. The upper hollow frame 6 is connected to the guide hopper 3, and the lower hollow frame 6 is connected to the mandrel 4. The lower inner end of the outer casing 1 is connected to the power input component 5, which is mounted on the outer casing 1 and is connected to the inner rotating cylinder 2. The power input end of the power input component 5 extends out of the outer casing 1. The power input component 5 is used to receive external power and drive the inner rotating cylinder 2 to rotate relative to the outer casing 1 and the spindle 4. When the inner rotating cylinder 2 rotates relative to the spindle 4, it discharges the powder from top to bottom; or when the inner rotating cylinder 2 stops rotating, it stops discharging the powder from top to bottom. By arranging the outer casing, inner rotating cylinder, and spindle sequentially from the outside to the inside, and with the outer casing and spindle relatively stationary, while the inner rotating cylinder... The inner drum and its internal spiral blades can rotate relative to the outer casing and spindle under the power transmission of the power input component. At this time, the inner drum and its internal spiral blades together with the spindle are equivalent to a screw conveyor to transport powder from top to bottom. The outer casing serves as the carrier for mounting the inner drum and spindle, and also plays a sealing role in the entire powder conveying valve. In addition, the guide hopper can gather the powder entering the outer casing and transport it into the inner drum. When the inner drum rotates, it can transport powder downwards, and adjusting the rotation speed of the inner drum can also adjust the downward feeding rate. When the inner drum stops running, the downward feeding stops.

[0037] There is a small annular gap (about 1 mm) between the outer side of the smaller end of the opening of the guide hopper and the inner wall of the upper end of the inner rotating cylinder, so as to avoid hard friction between the inner rotating cylinder and the guide hopper when rotating. This can prevent the powder from overflowing out of the guide hopper through the annular gap.

[0038] In the above technical solution, the outer sleeve 1 and the inner rotating cylinder 2 are coaxially distributed and have an annular gap between them. Multiple bearing components 7 are arranged at intervals along the vertical direction in the annular gap. The inner rotating cylinder 2 is coaxially rotatably connected to the outer sleeve 1 through the multiple bearing components 7. This makes the outer sleeve and the inner rotating cylinder more stable when they rotate through the bearing components.

[0039] In the above technical solution, bearing sealing rings 71 are respectively provided at both ends of the annular gap and fixedly connected to the outer casing 1. The inner edge of the bearing sealing ring 71 has an annular gap with the inner rotating cylinder 2 or is coaxially rotatably connected to the inner rotating cylinder 2 to seal both ends of the annular gap. In this way, the bearing sealing ring can block both ends of the annular gap to prevent dust from entering the annular gap and causing the bearing components to jam.

[0040] The power input component 5 in the above technical solution includes a bevel gear ring 51, a bevel gear 52, and a power input shaft 53. The bevel gear ring 51 is located within the annular gap and is coaxially fixedly installed on the outer wall of the inner rotating cylinder 2. The power input shaft 53 penetrates the outer casing 1 radially and is rotatably connected to the outer casing 1, and is close to the bevel gear ring 51. The bevel gear 52 is coaxially fixedly installed on one end of the power input shaft 53 located within the annular gap, and the bevel gear 52 meshes with the bevel gear ring 51. The end of the power input shaft 53 located outside the outer casing 1 constitutes the power input end of the power input component 5. This allows the power input shaft to drive the bevel gear ring to rotate through the bevel gear, and the bevel gear ring to drive the inner rotating cylinder to rotate. (In this embodiment, the power input component may also include a drive component, which may be a drive motor, specifically a geared motor, a servo motor, or a frequency converter motor. The drive component is located on the outer wall of the outer casing and is connected to the power input shaft via a transmission.)

[0041] The above technical solution also includes multiple ring sleeves 8, which are all sleeved on the outside of the outer casing 1 and vertically spaced on the outer casing 1. Each ring sleeve 8 corresponds one-to-one with a number of bearing components 7, and each ring sleeve 8 is horizontally aligned with the corresponding bearing component 7. Each ring sleeve 8 has a coolant inlet 81 and a coolant outlet 82. Coolant is introduced into the ring sleeve 8 to cool the bearing component 7. Since the bearing component generates heat when rotating, and the fly ash also conducts heat to the bearing component when passing through the inner rotating cylinder, by sleeves are sleeved on the outer wall of the outer casing, and the ring sleeves correspond one-to-one with the bearing components, the cooling water introduced into the ring sleeves can dissipate heat at the position of the bearing component on the outer casing. The ring sleeves can be integrally formed with the outer casing.

[0042] The above technical solution also includes two flange rings 9, which are respectively disposed on the outer sides of both ends of the outer casing 1, so that the two ends of the outer casing are joined by flange rings, which makes its sealing performance better (in order to improve the thermal insulation performance of the entire powder sealing conveying valve, a thermal insulation layer is provided on the inner or outer wall of the outer casing, and the thermal insulation layer can be a ceramic cotton material).

[0043] In this embodiment, the length of the inner rotating cylinder is less than the length of the outer casing, and both ends of the outer casing protrude beyond the inner rotating cylinder. Both hollow frames are annular plates (with numerous through holes spaced circumferentially on them for powder to fall through). Both hollow frames are coaxially fixedly sleeved at both ends of the mandrel. The outer edge of the upper hollow frame is embedded in the guide hopper, and the outer edge of the lower hollow frame is embedded in the lower inner end of the outer casing (the hollow frames are coaxially sleeved at both ends of the mandrel, and the upper end of the mandrel is conical to prevent powder from accumulating at the upper end of the mandrel. The lower end of the mandrel is provided with anti-caking nails 41 perpendicular to the mandrel (the anti-caking nails 41 are all located at the lower inner end of the inner rotating cylinder). This can break up the powder that clumps together at the lower inner end of the inner rotating cylinder.

[0044] In this embodiment, the inner rotating drum either stops rotating (the powder sealing conveying valve is in the closed state) or rotates together with the mandrel to convey the powder from top to bottom (the powder sealing conveying valve is in the open state).

[0045] The spiral blades described in this embodiment may be welded to the inner wall of the inner rotating cylinder and rotate synchronously with the inner rotating cylinder.

[0046] like Figure 2 As shown, the hollow frame includes an outer ring 61, an inner ring 62, and multiple support rods 63. Both the inner and outer rings are circular and coaxially distributed. The multiple support rods are spaced apart circumferentially between the outer and inner rings, and both ends of each support rod 63 are connected to the outer ring 61 and the inner ring 62, respectively. The holes in the inner ring form the inner hole of the hollow frame (the inner ring is coaxially and fixedly connected to the corresponding end of the mandrel). The outer ring forms the outer edge of the hollow frame. Specifically, there are three support rods 63. The area enclosed by two adjacent support rods, the inner ring, and the outer ring constitutes the through hole.

[0047] The ingenious aspect of this embodiment lies in the fact that the spiral blades are not mounted on the spindle, but rather on the inner wall of the inner rotating cylinder. This is more conducive to improving its sealing performance. In addition, with the spiral blades mounted on the inner rotating cylinder, they will also rotate synchronously with the inner rotating cylinder. This makes the powder conveyed from top to bottom more smoothly under the drive of the rotating spiral blades. (When the inner rotating cylinder of the powder sealing conveying valve is in a stopped state, a certain amount of powder will be reserved inside the inner rotating cylinder and at the powder supply component above it to seal the top of the inner rotating cylinder, thereby ensuring that the entire powder sealing conveying valve maintains good sealing performance when closed.)

[0048] Preferably, in order to improve the supporting effect of the outer sleeve 1 on the inner rotating cylinder 2, an annular support plate 11 can be provided on the inner wall of the outer sleeve 1 below any of the bearing components 7, and an annular support plate 22 can be provided on the outer wall of the inner rotating cylinder 2 above the corresponding bearing component 7. The bearing component 7 is sandwiched between the support plate 11 and the support plate 22 (at this time, the support plate 11 lifts the corresponding bearing component 7 and lifts the entire inner rotating cylinder 2, which can prevent the inner rotating cylinder 2 from sliding down along the bearing component 7 after long-term operation).

[0049] Example 2

[0050] like Figure 3As shown, this embodiment provides a fly ash detoxification system, including a fly ash detoxification tank 10, a fly ash cooling tank 20, a protective gas storage device 30, and two pressure balancers 40. Both the fly ash detoxification tank 10 and the fly ash cooling tank 20 are vertically arranged, with the fly ash cooling tank 20 located below the fly ash detoxification tank 10. Both the fly ash detoxification tank 10 and the fly ash cooling tank 20 have an ash inlet, a protective gas inlet, a pressure balancer port, and an ash outlet. A first valve 501 is provided at the ash inlet of the fly ash detoxification tank 10. The ash outlet of the fly ash detoxification tank 10 is connected to the ash inlet of the fly ash cooling tank 20, and a second valve 502 is provided at the connection point. A third valve 502 is provided at the ash outlet of the fly ash cooling tank 20. 03, and the first valve 501, the second valve 502, and the third valve 503 are all powder sealing conveying valves as described in Embodiment 1. A heating device 101 is provided on the fly ash detoxification tank 10 to heat the fly ash inside the fly ash detoxification tank 10. A cooling device 201 is provided on the fly ash cooling tank 20 to cool the fly ash inside the fly ash cooling tank. The pressure balance port of the fly ash detoxification tank 10 and the pressure balance port of the fly ash cooling tank 20 are respectively connected to the gas inlet and outlet of the corresponding pressure balancer 40, and a fourth valve 504 is provided at the connection point. The protective gas inlet of the fly ash detoxification tank 10 and the fly ash cooling tank 20... The protective gas inlets are all connected to the outlets of the protective gas storage unit 30, and fifth valves 505 are respectively installed at the connection points. The two pressure balancers 40 are used to stabilize the pressure in the fly ash detoxification tank 10 and the fly ash cooling tank 20, respectively. Thus, the first valve can be opened first, and the second and third valves can be closed to send fly ash into the fly ash detoxification tank. At this time, the heating device heats the fly ash in the fly ash detoxification tank to 380-400℃ and maintains it for a certain period of time (the specific time can be set according to the actual working conditions). During this time, the dioxins in the fly ash undergo pyrolysis. After the fly ash is detoxified in the fly ash detoxification tank, it is sent to the fly ash cooling tank for cooling through the second valve, and the fly ash in the fly ash detoxification tank is discharged. After the ash is emptied, new fly ash can be promptly fed in. The fly ash in the fly ash cooling tank is cooled down by cooling devices. Once the fly ash in the fly ash cooling tank is cooled to below 60°C, the third valve can be opened to discharge it. Since the fly ash cooling tank and fly ash detoxification tank can operate simultaneously, their operating efficiency is high. During operation, in order to avoid air leakage caused by internal pressure fluctuations, pressure balancers can be set separately to keep the pressure inside the fly ash detoxification tank and fly ash cooling tank stable, thereby minimizing gas exchange with the outside environment. In addition, protective gas storage devices supply protective gas to the fly ash detoxification tank and fly ash cooling tank so that the fly ash is detoxified under a protective gas atmosphere.

[0051] The above technical solution also includes a heat transfer fluid storage tank 60, and the heating device 101 is a heating coil. The two ends of the heating device 101 are the inlet and outlet, respectively. The heat transfer fluid storage tank 60 is provided with a replenishment port, an outlet, and a return port. The heat transfer fluid storage tank 60 is also provided with an electric heating element 601, which is used to heat the heat transfer fluid in the heat transfer fluid storage tank 60. The outlet and return port of the heat transfer fluid storage tank 60 are respectively connected to the two ends of the heating device 101, and the heat transfer fluid... A sixth valve 506 is provided at the outlet of the liquid storage tank 60, a seventh valve 507 is provided at the return port of the heat transfer liquid storage tank 60, and a circulation pump 102 is provided at the inlet of the heating device 101. In this way, the heat transfer liquid can be stored in the heat transfer liquid storage tank and heated. The heated heat transfer liquid is then sent to the heating device to heat the fly ash. During the heating process, the heat transfer liquid circulates between the heating device and the heat transfer liquid storage tank. A tenth valve 510 is provided at the replenishment port of the heat transfer liquid storage tank 60.

[0052] The fly ash cooling tank 20 described in the above technical solution is further equipped with a waste heat recovery coil 202. The two ends of the waste heat recovery coil 202 are an inlet and an outlet, respectively. The inlet of the waste heat recovery coil 202 is connected to the outlet of the heating device 101, and the outlet of the waste heat recovery coil 202 is connected to the inlet of the heating device 101. An eighth valve 508 is provided at the inlet of the waste heat recovery coil 202, and a ninth valve 509 is provided at the outlet of the waste heat recovery coil 202. This allows hot ash in the fly ash detoxification tank to be discharged into the fly ash cooling tank, and the fly ash... After fresh cold ash is added to the detoxification tank, the heat transfer fluid can be circulated between the waste heat recovery coil and the heating device beforehand. This allows the heat transfer fluid to carry away the heat from the hot ash in the fly ash cooling tank during circulation, thus preheating the cold ash in the fly ash detoxification tank. When the temperatures of the fly ash in the fly ash cooling tank and the fly ash detoxification tank are similar, the heat transfer fluid storage tank can then independently circulate and supply heat transfer fluid to the heating device to continue heating the fly ash in the fly ash detoxification tank. Meanwhile, the fly ash in the fly ash cooling tank is cooled by the cooling device. In this way, the heat carried by the fly ash in the fly ash cooling tank can be fully utilized.

[0053] The principle of fly ash waste heat utilization in the fly ash cooling chamber is as follows: First, the heat transfer fluid in the heat transfer fluid storage tank, heating device, and waste heat recovery coil is full. When initial heating of the fly ash in the fly ash detoxification tank is required, valves 506 and 507 are opened, and valves 508 and 509 are closed. Under the action of the circulation pump 102, the heat transfer fluid in the heat transfer fluid storage tank is continuously carried into the heating device to heat the fly ash in the fly ash detoxification tank. The temperature is raised to the set temperature (at which heat preservation treatment can be performed; when heating is not required, the circulation pump, valves 6 and 7 can be closed). After the fly ash in the fly ash detoxification tank is detoxified, the hot ash is discharged into the fly ash cooling tank. At this time, fresh cold ash is added to the fly ash detoxification tank, and the temperature of the hot ash in the fly ash cooling tank is significantly lower than that of the hot ash in the fly ash cooling tank. The temperature is higher than that of the cold ash in the fly ash detoxification tank. At this point, the waste heat of the fly ash in the fly ash cooling tank can be reused. Specifically, the sixth valve 506 and the seventh valve 507 are closed, and the eighth valve 508 and the ninth valve 509 are opened. The heat transfer fluid circulates between the heating device and the waste heat recovery coil under the action of the circulating pump 102, continuously transferring the heat contained in the hot ash in the fly ash cooling tank to the heating device to heat the cold ash in the fly ash detoxification tank. At this time, the cold ash in the fly ash detoxification tank is heated, while the hot ash in the fly ash cooling tank is cooled. When the temperatures of the fly ash in the fly ash detoxification tank and the fly ash cooling tank are close, the eighth valve and the ninth valve are closed, and the sixth valve and the seventh valve are opened. At this time, the fly ash in the fly ash detoxification tank is circulated with heat transfer fluid from the heat transfer fluid storage tank and continues to be heated, while the fly ash in the fly ash cooling tank is cooled to below 60°C by the cooling device.

[0054] In this embodiment, after the fly ash in the fly ash detoxification tank is discharged into the fly ash cooling tank, and fresh fly ash is added to the fly ash detoxification tank, the temperature of the fly ash in the fly ash cooling tank is much higher than that in the fly ash detoxification tank. At this time, part of the heat transfer fluid in the heating device can be circulated in the fly ash cooling tank through the waste heat recovery coil to partially reuse the waste heat of the fly ash in the fly ash cooling tank until the fly ash in the fly ash cooling tank is cooled down to a temperature comparable to that of the fresh fly ash in the fly ash detoxification tank. At this time, the heat transfer fluid can be directly stored independently in the heat transfer fluid storage tank for the heating device, while the fly ash in the fly ash cooling tank continues to be cooled down by the cooling device.

[0055] In this embodiment, the heat-conducting fluid can be heat-conducting oil.

[0056] The cooling device 201 in the above technical solution is a cooling coil with an inlet and an outlet at its two ends, respectively. Cooling liquid is introduced into the cooling device 201 to cool the fly ash in the fly ash cooling tank 20, so that the fly ash in the fly ash cooling tank can be cooled by directly introducing cooling liquid into the cooling device.

[0057] In this embodiment, the lower ends of both the fly ash detoxification tank and the fly ash cooling tank are inverted cone shapes. Taking the fly ash detoxification tank as an example, its ash inlet, protective gas inlet, and pressure balance port can all be set at the upper end of the fly ash detoxification tank, and its ash outlet is set at the cone tip at the lower end of the fly ash detoxification tank. The fly ash detoxification tank and the fly ash cooling tank have the same structure, so the specific structure of the fly ash cooling tank will not be described in detail. The heating device is spirally coiled inside the fly ash detoxification tank, with its two ends extending out of the fly ash detoxification tank. The cooling device 201 and the waste heat recovery coil 202 are both spirally coiled inside the fly ash cooling tank, and the two ends of the cooling device 201 and the waste heat recovery coil 202 extend out of the fly ash cooling tank.

[0058] In this embodiment, the pressure balancing in the fly ash detoxification tank and the fly ash cooling tank is independent, therefore each requires its own pressure balancer 40. Taking the fly ash detoxification tank as an example, when the temperature inside the fly ash detoxification tank rises or fly ash is added, the pressure inside will rise. To stabilize the pressure, part of the gas inside the fly ash detoxification tank needs to be discharged into the corresponding pressure balancer to ensure relatively stable pressure, especially to maintain a pressure comparable to the external pressure, while keeping the entire fly ash detoxification system sealed and isolated from the outside. When the fly ash detoxification tank discharges ash into the fly ash cooling tank, the pressure inside the fly ash detoxification tank will drop. To stabilize the pressure, the corresponding pressure balancer needs to introduce gas into the fly ash detoxification tank to avoid a pressure difference between the pressure inside the fly ash detoxification tank and the external air pressure (the pressure stabilization principle of the fly ash cooling tank is similar). In this embodiment, the protective gas is nitrogen. In this embodiment, the protective gas storage device 30 is a nitrogen cylinder for storing nitrogen.

[0059] like Figure 4As shown, the pressure balancer 40 in this embodiment includes a tank 401, a middle partition 402, a water pump 403, and a waste gas filter 404. The middle partition 402 is disposed in the middle of the tank 401 and divides the interior of the tank 401 into an upper chamber 401a and a lower chamber 401b. The tank 401 is provided with a gas breathing port 4011, an exhaust port 4012, a drain port 4013, and a return port 4014 communicating with the lower chamber 401b. (Both the gas breathing port 4011 and the exhaust port 4012 are...) The upper end of the lower chamber 401b is connected to the lower chamber 401b, and the drain port 4013 and return port 4014 can both be located at the lower end of the lower chamber 401b, and are always below the liquid surface in the lower chamber. The tank body 401 is provided with a liquid inlet port 4015, a liquid outlet port 4016, and a pressure balance port 4017 communicating with the upper chamber 401a (the liquid inlet port 4015 and the pressure balance port 4017 are located at the upper end of the upper chamber 401a, and are always above the liquid surface in the upper chamber). The liquid outlet 4016 is located at the lower end of the upper chamber 401a and is always below the liquid level in the upper chamber. The exhaust gas filter 404 has an inlet and an outlet. The exhaust port 4012 is connected to the inlet of the exhaust gas filter 404, and an eleventh valve 405 is provided at the connection. A twelfth valve 406 is provided at the outlet of the exhaust gas filter 404. The liquid drain port 4013 is connected to the liquid inlet 4015 through the water pump 403. The liquid outlet 4016 is connected to the return port 401. The system is connected to a 4-way valve, and a thirteenth valve 407 is provided at the connection point. The pressure balance port 4017 is connected to the atmosphere, and a fourteenth valve 408 is provided at the pressure balance port 4017. The gas breathing port 4011 constitutes the gas inlet and outlet of the pressure balancer 40. The upper chamber 401a and the lower chamber 401b are both used to partially contain liquid, which can be water. Preferably, the exhaust gas filter 404 can be located at the upper end of the tank 401, and the filter element in the exhaust gas filter 404 is composed of activated carbon.

[0060] The operating principle of the pressure balancer provided in this embodiment is as follows (taking the fly ash detoxification tank as an example): First, the fourth and fourteenth valves 408 corresponding to the fly ash detoxification tank are opened. When the pressure inside the fly ash detoxification tank tends to rise, the liquid in the lower chamber is pumped upward to the upper chamber by a water pump, so that more space is freed up in the lower chamber to store the gas overflowing from the fly ash detoxification tank, thus stabilizing the pressure inside the fly ash detoxification tank. When the pressure inside the fly ash detoxification tank tends to decrease, the thirteenth valve can be opened to discharge the liquid in the upper chamber to the lower chamber, so that the gas in the lower chamber is squeezed into the fly ash detoxification tank, causing the pressure inside the fly ash detoxification tank to rise and remain stable.

[0061] After the fly ash detoxification system has been running for a certain period of time, the gas composition in the fly ash detoxification tank and fly ash cooling tank changes significantly (in addition to containing protective gas, it also contains waste gas from pyrolysis such as dioxins). When the waste gas content increases to the point that it significantly affects the fly ash detoxification effect, the eleventh valve 405 and the twentieth valve 406 can be opened to exhaust gas from the lower chamber (that is, to indirectly exhaust gas from the fly ash detoxification tank and fly ash cooling tank). The exhaust gas is then vented after being adsorbed by the waste gas filter 404. At the same time, the fifth valve 505 is opened to replace the fly ash detoxification tank and fly ash cooling tank with fresh protective gas (that is, to indirectly replace the lower chamber with fresh protective gas).

[0062] In this embodiment, the operating pressure inside the fly ash detoxification tank and fly ash cooling tank is close to atmospheric pressure. This avoids a pressure difference with the external environment, thereby preventing leaks in the entire fly ash detoxification system. Taking the fly ash detoxification tank as an example, if the internal pressure is high, it will leak to the outside (the gas contains incompletely pyrolyzed dioxins), and if the internal pressure is low, external air will enter the fly ash detoxification tank (which will affect the oxygen-free environment inside the fly ash detoxification tank).

[0063] Example 3

[0064] Same as Example 2, except that, as Figures 5-7 As shown, in order to improve the automation level of the fly ash detoxification system described in this embodiment, a controller (which may be a PLC controller) may be added to this embodiment. Liquid level monitoring elements for monitoring the internal liquid level may be added to the inner bottom walls of the upper and lower chambers. Pressure monitoring elements for monitoring the internal pressure may be added to the upper ends of the fly ash detoxification tank and the fly ash cooling tank. Temperature monitoring elements for monitoring the internal fly ash temperature may be added to the lower side walls of the fly ash detoxification tank and the fly ash cooling tank.

[0065] In this embodiment, the controller can be installed in a control cabinet located in the factory area.

[0066] For the upper chamber and the lower chamber, there are upper and lower limits for the liquid level, respectively. (Taking the upper chamber as an example, its upper limit is the height of the liquid level when it rises to its maximum but cannot exceed the height of the liquid inlet 4015 and the air pressure balance port 4017, while its lower limit is the height of the liquid level when it drops to its maximum but cannot be lower than the height of the liquid outlet 4016. The upper and lower limits for the liquid level of the lower chamber are similar to those of the upper chamber and will not be described in detail here.)

[0067] In this embodiment, both the fourth valve 504 and the fourteenth valve 408 are normally open valves.

[0068] See details Figure 7 The thirteenth valve 407, the sixth valve 506, the seventh valve 507, the eighth valve 508, and the ninth valve 509 are all electric valves, and the thirteenth valve 407, the sixth valve 506, the seventh valve 507, the eighth valve 508, the ninth valve 509, the water pump, the circulating pump, the liquid level monitoring element, the temperature monitoring element, and the pressure monitoring element are all electrically connected to the controller (in this embodiment, the liquid level monitoring element can be a liquid level sensor, the temperature monitoring element can be a temperature sensor, and the pressure monitoring element can be a pressure sensor).

[0069] For a single pressure balancer, taking the pressure balancer for a fly ash detoxification tank as an example, its pressure stabilization control method is explained as follows: When the pressure monitoring element detects a decreasing trend in the pressure inside the fly ash detoxification tank compared to atmospheric pressure, the controller opens the thirteenth valve to discharge the liquid in the upper chamber to the lower chamber. This forces the gas in the lower chamber into the fly ash detoxification tank, restoring the pressure inside to near atmospheric pressure. Then, the controller closes the thirteenth valve. Conversely, when the pressure monitoring element detects an increasing trend in the pressure inside the fly ash detoxification tank compared to atmospheric pressure, the controller starts the water pump to discharge the liquid from the lower chamber. Pumping gas into the upper chamber empties the lower chamber, allowing some of the gas in the fly ash detoxification tank to enter the lower chamber, thus restoring the pressure inside the fly ash detoxification tank to near atmospheric pressure. The pump then stops. When the level indicator in either the upper or lower chamber detects that the liquid level is about to exceed the upper limit or fall below the lower limit, the controller stops the pump (if the liquid level in the lower chamber exceeds the lower limit or the liquid level in the upper chamber exceeds the upper limit) or closes the thirteenth valve (if the liquid level in the lower chamber exceeds the upper limit or the liquid level in the upper chamber exceeds the lower limit). The pressure stabilization control method for the pressure balancer in the fly ash cooling tank is similar and will not be elaborated upon here.

[0070] For the same air pressure balancer, when the thirteenth valve is open, the water pump must stop running; when the water pump is running, the thirteenth valve must be closed. The sixth valve 506 and the seventh valve 507 are either open or closed simultaneously, and the eighth valve 508 and the ninth valve 509 are either open or closed simultaneously.

[0071] The control method for the self-recovery of heat between the fly ash detoxification tank and the fly ash cooling tank is as follows:

[0072] When the temperature monitoring element detects that the fly ash temperature in the fly ash cooling tank is higher than that in the fly ash detoxification tank, the controller closes valves 506 and 507, while opening valves 508 and 509. Simultaneously, the controller operates the circulation pump. The heat transfer fluid circulates between the waste heat recovery coil and the heating elements, powered by the circulation pump, to use the waste heat from the fly ash in the fly ash cooling tank to heat the fly ash in the fly ash detoxification tank. Once the temperature monitoring element detects that the fly ash temperature in the fly ash cooling tank has dropped to a level comparable to that in the fly ash detoxification tank, the controller then closes valve 506. When valve 507 is opened, valves 508 and 509 are closed. At this time, the heat transfer fluid circulates between the heat transfer fluid storage tank and the heating device to heat the temperature of the fly ash in the fly ash detoxification tank to 380-400℃ (at this time, the operation of the circulation pump can be stopped, and valves 8 and 9 can also be closed. When the temperature drops below 380℃, valves 8 and 9 can be opened again and the circulation pump can be started to continue heating the temperature of the fly ash in the fly ash detoxification tank to 380-400℃, and so on until the fly ash detoxification is completed). At the same time, the cooling device is manually activated to continue cooling the fly ash cooling tank.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A powder sealing conveying valve, characterized in that, The assembly includes an outer casing (1), an inner rotating cylinder (2), a guide hopper (3), a mandrel (4), a power input component (5), and two hollow frames (6). The outer casing (1), inner rotating cylinder (2), and mandrel (4) are all vertically arranged. The inner rotating cylinder (2) is located in the middle of the outer casing (1) and is coaxially rotatably connected to the outer casing (1). The mandrel (4) is coaxially placed inside the inner rotating cylinder (2). Spiral blades (21) are vertically arranged around the mandrel (4) on the inner wall of the inner rotating cylinder (2), and the inner edge of the spiral blades (21) extends close to the mandrel (4) and can rotate relative to the mandrel (4) under the drive of the inner rotating cylinder (2). The guide hopper (3) is trumpet-shaped and is vertically arranged at the upper inner end of the outer casing (1) and above the inner rotating cylinder (2). The larger end of the opening of the guide hopper (3) faces upward and is aligned with the inner rotating cylinder (2). The upper end of the outer casing (1) is connected to the guide hopper (3), with the smaller end of the opening facing downwards and extending into the inner rotating cylinder (2). The two hollow frames (6) are respectively set at both ends of the mandrel (4). The upper hollow frame (6) is connected to the guide hopper (3), and the lower hollow frame (6) is connected to the lower inner end of the outer casing (1). The power input component (5) is set on the outer casing (1) and is connected to the inner rotating cylinder (2) in a transmission manner. The power input end of the power input component (5) extends out of the outer casing (1). The power input component (5) is used to receive external power and drive the inner rotating cylinder (2) to rotate relative to the outer casing (1) and the mandrel (4). When the inner rotating cylinder (2) rotates relative to the mandrel (4), it discharges the powder from top to bottom, or when the inner rotating cylinder (2) stops rotating, it stops discharging the powder from top to bottom.

2. The powder sealing conveying valve according to claim 1, characterized in that, The outer sleeve (1) and the inner rotating cylinder (2) are coaxially distributed and have an annular gap between them. Multiple bearing components (7) are spaced apart in the annular gap along the vertical direction. The inner rotating cylinder (2) is coaxially rotatably connected to the outer sleeve (1) through the multiple bearing components (7).

3. The powder sealing conveying valve according to claim 2, characterized in that, The two ends of the annular gap are respectively provided with bearing sealing rings (71) that are fixedly connected to the outer casing (1). The inner edge of the bearing sealing ring (71) has an annular gap with the inner rotating cylinder (2) or is coaxially rotatably connected with the inner rotating cylinder (2) to seal the two ends of the annular gap.

4. The powder sealing conveying valve according to claim 2, characterized in that, The power input component (5) includes a bevel gear ring (51), a bevel gear (52), and a power input shaft (53). The bevel gear ring (51) is located within the annular gap and is coaxially fixedly installed on the outer wall of the inner rotating cylinder (2). The power input shaft (53) passes radially through the outer casing (1) and is rotatably connected to the outer casing (1) and close to the bevel gear ring (51). The bevel gear (52) is coaxially fixedly installed on one end of the power input shaft (53) located within the annular gap, and the bevel gear (52) meshes with the bevel gear ring (51). The end of the power input shaft (53) located outside the outer casing (1) constitutes the power input end of the power input component (5).

5. The powder sealing conveying valve according to claim 2, characterized in that, It also includes multiple ring sleeves (8), which are all sleeved on the outside of the outer shell sleeve (1) and vertically spaced on the outer shell sleeve (1). Each ring sleeve (8) corresponds to a multiple bearing component (7), and each ring sleeve (8) is horizontally aligned with the corresponding bearing component (7). Each ring sleeve (8) has a coolant inlet (81) and a coolant outlet (82). Coolant is introduced into the ring sleeve (8) to cool the bearing component (7).

6. The powder sealing conveying valve according to any one of claims 1-5, characterized in that, It also includes two flange rings (9), which are respectively disposed on the outer sides of both ends of the outer casing (1).

7. A fly ash detoxification system, characterized in that, The system includes a fly ash detoxification tank (10), a fly ash cooling tank (20), a protective gas storage unit (30), and two pressure balancers (40). Both the fly ash detoxification tank (10) and the fly ash cooling tank (20) are vertically arranged, with the fly ash cooling tank (20) located below the fly ash detoxification tank (10). Both the fly ash detoxification tank (10) and the fly ash cooling tank (20) have an ash inlet, a protective gas inlet, a pressure balancer port, and an ash outlet. The fly ash detoxification tank (10) has… A first valve (501) is provided at the ash inlet. The ash outlet of the fly ash detoxification tank (10) is connected to the ash inlet of the fly ash cooling tank (20), and a second valve (502) is provided at the connection between the two. A third valve (503) is provided at the ash outlet of the fly ash cooling tank (20). The first valve (501), the second valve (502), and the third valve (503) are all powder sealing conveying valves as described in any one of claims 1-6. A heating device (101) is provided on the fly ash detoxification tank (10) to heat the fly ash in the fly ash detoxification tank (10). A cooling device (201) is provided on the fly ash cooling tank (20) to cool the fly ash in the fly ash cooling tank. The pressure balance port of the fly ash detoxification tank (10) and the pressure balance port of the fly ash cooling tank (20) are respectively connected to the corresponding pressure balance ports. The gas inlet and outlet of the device (40) are connected, and a fourth valve (504) is provided at the connection. The protective gas inlet of the fly ash detoxification tank (10) and the protective gas inlet of the fly ash cooling tank (20) are both connected to the outlet of the protective gas storage device (30), and a fifth valve (505) is provided at the connection. The two pressure balancers (40) are used to stabilize the pressure in the fly ash detoxification tank (10) and the fly ash cooling tank (20) respectively.

8. The fly ash detoxification system according to claim 7, characterized in that, It also includes a heat transfer fluid storage tank (60), the heating device (101) is a heating coil, the two ends of the heating device (101) are the liquid inlet and the liquid outlet respectively, the heat transfer fluid storage tank (60) is provided with a liquid replenishment port, a liquid outlet and a liquid return port, the heat transfer fluid storage tank (60) is also provided with an electric heating element (601), the electric heating element (601) is used to heat the heat transfer fluid in the heat transfer fluid storage tank (60), the liquid outlet and the liquid return port of the heat transfer fluid storage tank (60) are respectively connected to the two ends of the heating device (101), and a sixth valve (506) is provided at the liquid outlet of the heat transfer fluid storage tank (60), a seventh valve (507) is provided at the liquid return port of the heat transfer fluid storage tank (60), and a circulation pump (102) is provided at the liquid inlet of the heating device (101).

9. The fly ash detoxification system according to claim 8, characterized in that, The fly ash cooling tank (20) is also equipped with a waste heat recovery coil (202). The two ends of the waste heat recovery coil (202) are the liquid inlet and the liquid outlet, respectively. The liquid inlet of the waste heat recovery coil (202) is connected to the liquid outlet of the heating device (101), and the liquid outlet of the waste heat recovery coil (202) is connected to the liquid inlet of the heating device (101). An eighth valve (508) is provided at the liquid inlet of the waste heat recovery coil (202), and a ninth valve (509) is provided at the liquid outlet of the waste heat recovery coil (202).

10. The fly ash detoxification system according to any one of claims 7-9, characterized in that, The cooling device (201) is a cooling coil with an inlet and an outlet at its two ends. Cooling liquid is introduced into the cooling device (201) to cool the fly ash after waste heat recovery in the fly ash cooling tank (20).

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