A screw cooler for cooling a boiler melt

Abstract

This utility model relates to the field of molten material cooling technology, specifically a spiral cooler for cooling boiler molten material. The cooler includes a shell and a cooling conveying assembly. The shell has an inlet and an outlet at both ends. The cooling conveying assembly includes a rotating shaft rotatably disposed within the shell, with a water inlet core tube inside the shaft, forming a reflux chamber between the shaft and the water inlet core tube. The shaft has a hollow first spiral blade, multiple paddle blades, and a second spiral blade near the inlet along its axial direction. The first spiral blade is located near the outlet end. The water inlet core tube is connected to multiple water inlet branch pipes, and the first spiral blade and multiple paddle blades are correspondingly connected to each water inlet branch pipe. A rotary joint is located at one end of the shaft, with an inlet connecting to the water inlet core tube and an outlet connecting to the reflux chamber. The paddle blades agitate the molten material, allowing for thorough cooling. The first spiral blade, positioned at the outlet end, provides better cooling while ensuring proper conveying.

Description

Technical Field

[0001] This utility model relates to the field of molten material cooling technology, specifically to a spiral cooler for cooling molten material in a boiler. Background Technology

[0002] In industry, the molten material produced after boiler combustion flows out from the bottom of the furnace through an inclined chute. The temperature of the molten material can reach thousands of degrees and contains a huge amount of heat. When it comes into contact with water or humid air, there is a risk of evaporative explosion, so it needs to be cooled.

[0003] Existing coolers include an outer shell and a rotating shaft located inside the outer shell. Hollow spiral blades are wound around the shaft, and cooling is achieved by coolant flowing inside the spiral blades. However, the spiral blades act as a conveyor when they rotate, resulting in a short cooling time for the molten material and poor cooling effect. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the aforementioned background technology and provide a spiral cooler for cooling boiler molten material with better cooling effect.

[0005] The technical solution adopted in this utility model is: a spiral cooler for cooling boiler molten material, the cooler comprising,

[0006] The outer casing has an inlet and an outlet at each end;

[0007] A cooling conveying assembly includes a rotating shaft rotatably disposed within a housing, a water inlet core tube disposed within the rotating shaft, and a reflux chamber formed between the rotating shaft and the water inlet core tube; a first helical blade and multiple paddle blades, all hollow and connected to the reflux chamber, are disposed along the axial direction of the rotating shaft; the first helical blade is located at the end of the rotating shaft near the discharge port, and a second helical blade is disposed at the end of the rotating shaft near the inlet port; the paddle blades are located between the first and second helical blades; multiple water inlet branch pipes are connected to the water inlet core tube, and the first helical blade and the multiple paddle blades are correspondingly connected to each water inlet branch pipe; a rotary joint is provided at one end of the rotating shaft, and the rotary joint has a water inlet connected to the water inlet core tube and a water outlet connected to the reflux chamber.

[0008] Furthermore, the first helical blade includes a plurality of sub-helical blades arranged on the rotating shaft with the same helical direction; the sub-helical blades are connected to the rotating shaft and pass through the rotating shaft via the water inlet branch pipe to connect to the water inlet core pipe.

[0009] Furthermore, the blades are fan-shaped, and the fan-shaped blades are wedge-shaped bodies with a thin end and a thick end along an arc-shaped direction.

[0010] Furthermore, multiple blades are spaced apart along the axial direction on the rotating shaft, with their thin ends facing the direction of rotation of the shaft.

[0011] Furthermore, two axially adjacent blades are located on opposite sides of the circumference of the shaft.

[0012] Furthermore, a second helical blade is provided on the rotating shaft near the feed inlet, and the blade is located between the first and second helical blades; the pitch of the second helical blade is greater than the pitch of the first helical blade.

[0013] Furthermore, the cooling conveying assembly is provided in two sets, with the first spiral blades of the two rotating shafts embedded in the gap on opposite sides, the spiral directions being opposite, and rotating synchronously in opposite directions.

[0014] Furthermore, the two sets of blades on the two rotating shafts are arranged at a lateral offset.

[0015] Furthermore, each rotating shaft has two adjacent blades on opposite sides of its circumference; the central angle of each blade is less than 180°; the two sets of blades on the two rotating shafts correspond one-to-one in the longitudinal direction and are arranged opposite each other on the vertical sides, so that when the two rotating shafts rotate, the two sets of blades are in clearance fit within the cross section of the blades.

[0016] Furthermore, the outer shell is a sandwich structure with a sandwich cavity, and the sandwich cavity is provided with multiple partition plates along the axial direction of the outer shell. The multiple partition plates divide the sandwich cavity into multiple cold cavity units for containing coolant.

[0017] Furthermore, the ends of adjacent cold cavity units are staggered and connected to form an S-shaped cold cavity.

[0018] Furthermore, the outer shell has a U-shaped structure, and a cover plate is provided at the U-shaped end of the outer shell.

[0019] Furthermore, it also includes a drive device connected to the rotating shaft drive to drive the rotating shaft to rotate.

[0020] The beneficial effects of this utility model include:

[0021] The cooling conveying assembly of this utility model has a first spiral blade and multiple paddle blades on its rotating shaft. The water inlet core pipe inside the rotating shaft is connected to the paddle blades and the first spiral blades through multiple water inlet branch pipes. The paddle blades and the first spiral blades are connected to the rotating shaft to discharge the cooled liquid after heat absorption. The molten material enters the outer shell and is conveyed into the paddle blades by the second spiral blade. The paddle blades stir and cool the material, and the flow rate is relatively slow, allowing sufficient cooling time. The material is then cooled and conveyed out of the outer shell by the first spiral blade, resulting in a better cooling effect. The first spiral blade is located at the discharge port end, which can prevent the molten material from gradually cooling into a solid state and discharging slowly, thus avoiding adhesion to the paddle blades and preventing coking.

[0022] The first helical blade is formed by multiple sub-helical blades, which helps to improve the cooling effect and the timeliness of cooling, and avoids the poor cooling effect of the subsequent helical blades after the coolant in the continuous first helical blades absorbs heat.

[0023] The fan-shaped blades have reserved space for the flow of molten material, and the wedge-shaped structure can fully stir the molten material and reduce rotational resistance.

[0024] The blades are spaced upwards along the shaft axis, and the reserved space is conducive to fully stirring the melt. The thin end facing the direction of rotation helps to reduce rotational damping.

[0025] The two adjacent blades are located on opposite sides of the circumference of the rotating shaft, which extends the flow path of the molten material and improves the cooling effect; at the same time, it avoids the molten material from clogging between the blades.

[0026] The pitch of the second helical blade is greater than that of the first helical blade, which causes the molten material to move quickly into the slow-moving part, prolonging the cooling time and improving the cooling effect;

[0027] Two sets of cooling and conveying components can improve the cooling effect. The two sets of first spiral blades are fitted with a gap and the spiral directions are opposite, so that the rotating shaft rotates synchronously and improves the stirring effect.

[0028] The two sets of blades are aligned longitudinally and opposite each other vertically, which can avoid mutual interference between the two sets of blades when the dual shafts rotate, and at the same time improve the stirring effect, thereby improving the cooling effect.

[0029] When the outer shell has a sandwich structure, coolant can flow into the sandwich cavity, further improving the cooling effect; by dividing it into multiple cold cavity units through multiple partition plates, the partition plates occupy the flow cross section, which can reduce the amount of coolant used;

[0030] The staggered connection of the ends of the cold cavity unit forms an S-shaped cold cavity, which increases the flow path of the coolant and improves the cooling effect.

[0031] The spiral cooler of this utility model has a slower flow rate of molten material after it enters the paddle blades compared to a full spiral blade cooler. The paddle blades provide stirring, which can extend the cooling time. The first spiral blade is located at the discharge port to transport the cooled molten material (or solid) out of the shell, preventing the molten material from coking on the paddle blades. The paddle blades and the first spiral blades are arranged in sections to ensure better cooling effect while maintaining the conveying function. Attached Figure Description

[0032] Figure 1 Schematic diagram of a spiral cooler for cooling boiler molten material;

[0033] Figure 2 : A schematic diagram of the structure connecting the first helical blade, the propeller blade, and the second helical blade via a rotating shaft;

[0034] Figure 3 : A schematic diagram of the cross-section of the rotating shaft connecting the sub-spiral blades;

[0035] Figure 4 : A schematic diagram of the cross-section of the shaft connecting the propeller blades;

[0036] Figure 5 : A schematic diagram of the cross-sectional structure of the blades on the rotating shafts of the two sets of cooling conveying components;

[0037] Figure 6 : A schematic diagram of a structure with two sets of blades arranged laterally at intervals;

[0038] Figure 7 : A schematic diagram of a structure with a cooling cavity unit in the outer shell;

[0039] Figure 8 : A cross-sectional schematic diagram of the outer casing;

[0040] Wherein: 1-outer shell; 11-feed inlet; 12-cover plate; 13-partition plate; 14-cold cavity unit; 2-rotating shaft; 21-reflux cavity; 22-first spiral blade; 221-sub-spiral blade; 23-paddle blade; 24-second spiral blade; 25-gear; 26-reflux hole; 3-inlet core pipe; 31-inlet branch pipe; 4-rotary joint; 41-inlet; 42-outlet; 5-drive device. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary. The drawings are not drawn to scale and are intended to explain this utility model, and should not be construed as limiting this utility model.

[0042] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0045] The molten material produced by boiler combustion flows out from the bottom of the furnace through a chute with a high inlet and a low outlet. The molten material carries a large amount of heat. Existing coolers use coolant flowing inside spiral blades for cooling, but the cooling time provided by the spiral blades is too short, resulting in poor cooling effect.

[0046] This utility model relates to a spiral cooler for cooling boiler molten material. The rotating shaft 2 of its cooling conveying assembly is equipped with a first spiral blade 22 and multiple paddle blades 23. The water inlet core pipe 3 inside the rotating shaft 2 is connected to the paddle blades 23 and the first spiral blade 22 via multiple water inlet branch pipes 31. The paddle blades 23 and the first spiral blade 22 are connected to the rotating shaft 2 to discharge the cooled liquid after heat absorption. The molten material enters the outer shell 1 and is conveyed by the second spiral blade 24 to the paddle blades 23 for stirring and cooling. The flow rate is slower in the paddle blade 23 area, providing sufficient cooling time. After further cooling and conveying by the first spiral blade 22, it is discharged from the outer shell 1, resulting in a better cooling effect. The first spiral blade 22 is located at the discharge port end, preventing the molten material from gradually cooling and solidifying, causing it to adhere to the paddle blades 23 and preventing coking. It is convenient to use, has a good cooling effect, and has great potential for widespread application.

[0047] A spiral cooler for cooling boiler molten material, such as Figure 1-8As shown, the device includes a housing 1 and a cooling conveying assembly disposed within the housing 1. The housing 1 has an inlet 11 and an outlet at both ends. The cooling conveying assembly includes a rotating shaft 2 rotatably disposed within the housing 1, with both ends of the shaft 2 rotatably mounted on the housing 1 via bearings. A water inlet core tube 3 is disposed within the rotating shaft 2, forming a reflux chamber 21 between the rotating shaft 2 and the water inlet core tube 3. The rotating shaft 2 has a hollow first spiral blade 22 and multiple paddle blades 23 along its axial (lateral) direction, all communicating with the reflux chamber 21. The first spiral blade 22 is located at the end of the rotating shaft 2 near the outlet, facilitating discharge when the molten material cools from a liquid to a solid state, thus preventing the molten material from cooling and then re-discharging. Coking occurs on the end of the blade 23; the water inlet core pipe 3 is connected to multiple water inlet branch pipes 31, and the first spiral blade 22 and multiple blades 23 are connected to each water inlet branch pipe 31; a second spiral blade 24 is provided on the shaft 2 near the feed port 11, and the blade 23 is located between the first spiral blade 22 and the second spiral blade 24; this can solve the problem of insufficient power for the flow of molten material at the feed port 11, and prevent the molten material from flowing too slowly to the blade 23 or accumulating at the feed port 11, thus reducing the cooling efficiency; a rotary joint 4 is provided at one end of the shaft 2, and the rotary joint 4 is provided with a water inlet 41 connected to the water inlet core pipe 3 and a water outlet 42 connected to the return chamber 21.

[0048] The liquid melt flows into the outer shell 1 through the inlet 11 and flows to the paddle blade 23 for stirring and cooling under the transport action of the second spiral blade 24. The first spiral blade 22 is located at the outlet end to facilitate the discharge of the melt that has gradually turned into a solid state after cooling, thus avoiding the melt from coking and adhering to the paddle blade 23 due to slow discharge after cooling and solidification, or from being blocked at the outlet end and causing damage to the cooling components.

[0049] In a specific plan, such as Figure 3-4 As shown, the rotating shaft 2 is provided with multiple return holes 26, and the rotating shaft 2 is connected to the first helical blade 22 and multiple propeller blades 23 respectively through the return holes 26.

[0050] In addition, the second helical blade 24 can adopt the same structure as the first helical blade 22 to connect the rotating shaft 2 and the water inlet core tube 3.

[0051] In one embodiment, such as Figure 1-3As shown, the first helical blade 22 includes multiple sub-helical blades 221. The sub-helical blades 221 are mounted on the rotating shaft 2 with a consistent helical direction and are hollow. The sub-helical blades 221 are connected to the rotating shaft 2 and pass through the water inlet branch pipe 31 to connect to the water inlet core pipe 3. Preferably, a sub-helical blade 221 rotates 180° around the rotating shaft 2 and then translates laterally to coincide with the adjacent helical sub-blade 221 in the helical direction. When the helical blades are continuously connected, the coolant at the end of the helical blade absorbs heat in the front section, resulting in a decrease in cooling effect. However, the sub-helical blades 221 are separated and independently connected to the rotating shaft 2, which helps to improve the cooling effect and the timeliness of cooling, and avoids the poor cooling effect of the helical blades in the rear section after the coolant in the continuous first helical blade 22 absorbs heat.

[0052] In one embodiment, such as Figure 4 As shown, the blade 23 has a fan-shaped structure. The fan-shaped blade 23 is a wedge-shaped body with a thin end and a thick end along the arc direction. The fan shape is to reserve space for the flow of molten material in the blade 23, and the wedge-shaped structure can fully stir the molten material and reduce rotational resistance.

[0053] Based on the fact that blade 23 is a wedge-shaped body, such as Figure 1-2 As shown, multiple blades 23 are spaced apart along the axial direction on the rotating shaft 2, with the thin ends facing the rotation direction of the rotating shaft 2. The blades 23 are spaced apart along the axial direction of the rotating shaft 2. The reserved space is conducive to fully stirring the melt, and the thin ends facing the rotation direction is conducive to reducing rotational damping.

[0054] Preferably, two axially adjacent blades 23 are located on opposite sides of the circumference of the rotating shaft 2, such as... Figure 1-2 As shown, two adjacent blades 23 are positioned opposite each other on vertical sides, which extends the flow path of the molten material and improves the cooling effect; at the same time, it avoids the molten material from clogging between the blades 23.

[0055] Preferably, such as Figure 2 As shown, the pitch h2 of the second helical blade 24 is greater than the pitch h1 of the first helical blade 22, making the transport speed of the second helical blade 24 greater than that of the first helical blade 22. This causes the molten material to flow quickly into the middle blade 23, where the flow rate slows down. After better stirring and cooling, the molten material (or solid) is then transported out by the second helical blade 24. This allows the molten material to move quickly into the slow-moving part, extending the cooling time and improving the cooling effect.

[0056] In some embodiments, such as Figure 1As shown, the cooling conveying assembly has two sets. The first spiral blades 22 of the two rotating shafts 2 (dual shafts) are embedded with gaps on opposite sides, with opposite spiral directions, and the two rotating shafts 2 rotate synchronously in opposite directions. In a more specific embodiment, one set of first spiral blades 22 rotates 180° vertically and then translates to overlap with the first spiral blades 22 of the other set (another rotating shaft 2). The two sets of cooling conveying assemblies can improve the cooling effect. The two sets of first spiral blades 22 are embedded with gaps, have opposite spiral directions, and the two rotating shafts 2 rotate synchronously in opposite directions, with the conveying direction being consistent, which enhances the stirring effect and thus improves the cooling effect.

[0057] In a specific scheme, such as Figure 6 As shown, the two sets of blades 23 on the two rotating shafts 2 are staggered in the lateral direction. When the distance between the two rotating shafts 2 is less than twice the difference between the outer radius and the inner radius of the fan-shaped blade 23, phase interference between the two sets of blades 23 during rotation can be avoided.

[0058] The cooling conveyor assembly is provided in two sets, such as Figure 1 and Figure 5 As shown, each rotating shaft 2 has two adjacent blades 23 arranged on opposite sides of the circumference of the shaft 2; the central angle occupied by each blade 23 is less than 180°; the two sets of blades 23 of the two rotating shafts 2 are one-to-one in the longitudinal direction and are arranged opposite each other on the vertical sides, so that when the two rotating shafts 2 rotate, the two sets of blades 23 are in clearance fit within the cross section of the blade 23, that is, the two sets of blades 23 do not face the opposite side of the two rotating shafts 2 at the same time; compared with the transversely spaced staggered arrangement, the number of blades 23 can be increased while the flow cross section size can be retained, which can avoid the mutual interference of the two sets of blades 23 when the two shafts rotate, and at the same time improve the stirring effect, thereby improving the cooling effect.

[0059] In a preferred embodiment, such as Figure 7-8 As shown, the outer shell 1 is a sandwich structure with a sandwich cavity. Multiple partition plates 13 are provided within the sandwich cavity along the axial direction of the outer shell 1. These partition plates 13 divide the sandwich cavity into multiple cold cavity units 14 for containing coolant. Injecting flowing coolant into the sandwich cavity can further improve the cooling effect. The partition plates 13 occupy a flow cross-section, thus reducing the amount of coolant used.

[0060] Since the outer shell 1 is a sandwich structure with a cavity, preferably, as shown below, Figure 7-8 As shown, the ends of adjacent cold cavity units 14 are staggered to form an S-shaped cold cavity. The coolant flows in a meandering manner within the S-shaped cold cavity, which increases the flow path of the coolant and improves the cooling effect.

[0061] Furthermore, the outer shell 1 has a U-shaped structure, and a cover plate 12 is provided at the U-shaped end of the outer shell 1. The cover plate 12 is provided with an inlet 11, and an outlet is provided at the bottom of the end of the outer shell 1 opposite to the inlet 11.

[0062] Furthermore, it also includes a drive device 5 that is connected to the rotating shaft 2 for driving the rotating shaft 2 to rotate.

[0063] When the cooling conveying assembly is provided in two sets, the drive device 5 is connected to a rotating shaft 2 for transmission. The two rotating shafts 2 can be meshed and transmitted by fixing the same gear 25 to each other, which facilitates synchronous reverse rotation. The drive device 5 is preferably a motor, and the output end of the motor is connected to a rotating shaft 2 through a transmission belt.

[0064] In actual use, two sets of cooling conveying components are used. Each set of rotating shafts 2 has a second spiral blade 24, a paddle blade 23 and a first spiral blade 22 arranged sequentially from the inlet 11 to the outlet. The spiral blades of the two sets of rotating shafts 2 have opposite spiral directions and are fitted with gaps. The two rotating shafts 2 rotate synchronously in opposite directions. The central angle occupied by each paddle blade 23 is less than 180°. The two sets of paddle blades 23 correspond one-to-one in the longitudinal direction and are arranged opposite each other on both sides of the vertical direction. This can avoid mutual interference between the two sets of paddle blades 23 when the dual shafts rotate, and at the same time improve the stirring and cooling effect. The outer shell 1 is a sandwich structure. The partition plate 13 divides the sandwich cavity into multiple cold cavity units 14. The ends of adjacent cold cavity units 14 are staggered and connected to form an S-shaped cold cavity.

[0065] The coolant can be demineralized water, and the demineralized water after heat exchange can flow into the boiler's deaerator for makeup water, allowing for reuse and saving costs.

[0066] The molten material flows in through the inlet 11, and the two shafts rotate synchronously in opposite directions. The second spiral blade 24 transports the molten material to the blade section 23 for stirring and cooling. The flow rate of the molten material slows down in the blade section 23, allowing for thorough cooling. The coolant flows from the inlet core pipe 3 through the inlet branch pipe 31 into the blade section 23 and each spiral blade. After absorbing heat, it flows into the return chamber 21 of the rotating shaft 2 and is discharged through the outlet 42 of the rotary joint 4. It can flow into the deaerator of the boiler for makeup water. The interlayer cavity of the outer shell 1 has a large flow cross section. The partition plate 13 divides the interlayer into multiple cold chamber units 14, which can reduce the amount of coolant used. The multiple cold chamber units 14 are connected to form an S-shaped cold chamber, which increases the flow path and improves the cooling effect. After cooling, the molten material gradually turns into a solid. Its flow capacity is poor. The first spiral blade 22 rotates to transport the cooled solid molten material through the outlet and discharge it from the outer shell 1. It is convenient to use, has a good cooling effect, and has great promotional value.

[0067] The transverse lengths of the first helical blade 22, the propeller blade 23, and the second helical blade 24 can be adjusted according to actual conditions. For example, the length can be adapted so that when the molten material cools into a solid state, it is located at the junction of the first helical blade 22 and the propeller blade 23, and is transported out of the outer shell 1 by the first helical blade 22.

[0068] The various solutions of this utility model can be used in combination without mutual exclusion.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A screw cooler for cooling a boiler melt, characterized by: include, The outer shell (1) has an inlet (11) and an outlet at both ends; A cooling conveying assembly includes a rotating shaft (2) rotatably disposed within a housing (1), a water inlet core pipe (3) disposed within the rotating shaft (2), and a reflux chamber (21) formed between the rotating shaft (2) and the water inlet core pipe (3); a first helical blade (22) and multiple paddle blades (23) are provided along the axial direction of the rotating shaft (2), both hollow and communicating with the reflux chamber (21), the first helical blade (22) being located at the end of the rotating shaft (2) near the discharge port, and a second helical blade (24) being provided at the end of the rotating shaft (2) near the inlet (11), and the paddle blades (23) being located at the end of the first helical blade (22) near the discharge port (11). Between the helical blade (22) and the second helical blade (24); the blade (23) has a fan-shaped structure, and the fan-shaped blade (23) is a wedge-shaped body with a thin end and a thick end along the arc direction; the water inlet core pipe (3) is connected to multiple water inlet branch pipes (31), and the first helical blade (22) and multiple blades (23) are connected to each water inlet branch pipe (31); one end of the rotating shaft (2) is provided with a rotary joint (4), and the rotary joint (4) is provided with a water inlet (41) connected to the water inlet core pipe (3) and a water outlet (42) connected to the return cavity (21).

2. The spiral cooler for cooling boiler molten material as described in claim 1, characterized in that: The first helical blade (22) includes a plurality of sub-helical blades (221) arranged on the rotating shaft (2) with the same helical direction; the sub-helical blades (221) are connected to the rotating shaft (2) and pass through the rotating shaft (2) via the water inlet branch pipe (31) to connect to the water inlet core pipe (3).

3. A spiral cooler for cooling boiler molten material as described in claim 2, characterized in that: Multiple blades (23) are spaced apart along the axial direction on the shaft (2), with their thin ends facing the direction of rotation of the shaft (2).

4. A spiral cooler for cooling boiler molten material as described in claim 3, characterized in that: Two axially adjacent blades (23) are located on opposite sides of the circumferential axis of the shaft (2).

5. A spiral cooler for cooling boiler molten material as described in claim 1, characterized in that: The pitch of the second helical blade (24) is greater than the pitch of the first helical blade (22).

6. A spiral cooler for cooling boiler molten material as described in any one of claims 1-5, characterized in that: The cooling conveying assembly is provided with two sets of first spiral blades (22) of two rotating shafts (2) with the first spiral blades (22) embedded in the gap on opposite sides, the spiral directions are opposite, and they rotate synchronously in opposite directions.

7. A spiral cooler for cooling boiler molten material as described in claim 6, characterized in that: Two adjacent blades (23) of each shaft (2) are located on opposite sides of the shaft (2) in the circumferential direction; the central angle of each blade (23) is less than 180°; the two sets of blades (23) of the two shafts (2) are one-to-one in the longitudinal direction and are set opposite to each other on the vertical sides, so that when the two shafts (2) rotate, the two sets of blades (23) are in clearance fit within the cross section of the blade (23).

8. A spiral cooler for cooling boiler molten material as described in claim 6, characterized in that: The two sets of blades (23) of the two rotating shafts (2) are arranged in a staggered manner in the lateral direction.

9. A spiral cooler for cooling boiler molten material as described in claim 1, characterized in that: The outer shell (1) is a sandwich structure with a sandwich cavity. Multiple partition plates (13) are provided in the sandwich cavity along the axial direction of the outer shell (1). The multiple partition plates (13) divide the sandwich cavity into multiple cold cavity units (14) for containing coolant.

10. A spiral cooler for cooling boiler molten material as described in claim 9, characterized in that: The ends of adjacent cold cavity units (14) are staggered to form an S-shaped cold cavity.

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