A pulverized coal boiler system capable of directly combusting combustible solid waste and a method thereof

Abstract

The application discloses a pulverized coal boiler system capable of directly burning combustible solid waste and a method thereof, and belongs to the technical field of the pulverized coal boiler system.The application combines an inclined rotary grate with a cold ash hopper of the pulverized coal boiler, utilizes high-temperature flue gas heat in the cold ash hopper space to preheat the waste solid objects, and utilizes the inclined rotary grate and the high-temperature flue gas circulation to perform self-heating incineration of the solid waste, so that the application has the advantages of high solid waste treatment efficiency, wide application range, reduced investment in the special construction of a solid waste incinerator, and greatly reduced operation cost.In addition, when the flue gas is mixed, the reciprocating motion of the sealing plug is realized through cooperation of a petal cam driven by a mixing assembly and a hydraulic adjusting assembly, the air inlet position of an air inlet head can be changed, the convection effect of the flue gas is enhanced, the high-temperature flue gas spirally flows into a spiral channel, and multi-stage mixing of the high-temperature flue gas is realized in cooperation with a stirring assembly, so that the mixing efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulverized coal boiler systems, and in particular to a pulverized coal boiler system capable of directly burning combustible solid waste and a method thereof. BACKGROUND

[0002] In the energy field, with the increasing global awareness of environmental protection and the increasingly stringent carbon emission restrictions, the traditional coal power industry is facing tremendous transformation pressure. In order to cope with this challenge, the development and application of technology capable of directly mixing combustible solid waste in a pulverized coal boiler has become an important research direction.

[0003] Traditional pulverized coal boilers mainly rely on coal as fuel, and coal power units have a high carbon emission reduction, resulting in low flexibility of coal and non-fossil material coupling power generation, which is not conducive to effective utilization of existing resources, and is difficult to achieve the sustainability of coal power development and promote the low-carbon and clean development of the coal power industry.

[0004] In the current flue gas heat recovery and reuse technology system, the mixing tank plays a key role in mixing and processing multiple flue gases. However, the flue gas mixing tank in the prior art faces a series of challenges in actual application. Specifically, these mixing tanks are difficult to quickly and effectively mix two gases sufficiently, and the required mixing time is long, which often leads to uneven mixing of flue gas, thereby adversely affecting the recirculation combustion effect of the flue gas. More critically, the existing mixing tank lacks the ability to pressurize and heat the flue gas during the mixing process, which directly results in a low output flue gas temperature, making it difficult to meet the direct reuse requirements, thereby limiting the efficiency and flexibility of the entire flue gas heat recovery and reuse system. Therefore, it is urgent to develop a flue gas mixing tank that can quickly mix gases and simultaneously achieve pressurization and heating treatment to improve the efficiency and effectiveness of flue gas reuse. SUMMARY

[0005] The purpose of the present application is to solve the problem that the traditional pulverized coal boiler is not conducive to effective utilization of existing resources, and the flue gas mixing tank in the prior art is difficult to quickly and effectively mix two gases sufficiently, and the required mixing time is long, and lacks the ability to pressurize and heat the flue gas, which directly results in a low output flue gas temperature, making it difficult to meet the direct reuse requirements, and to propose a pulverized coal boiler system capable of directly burning combustible solid waste and a method thereof.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A pulverized coal boiler system capable of directly burning combustible solid waste, comprising a boiler device, the boiler device comprising: a furnace; a cold ash bucket arranged below the furnace; an inclined rotating grate arranged below the cold ash bucket; a bunker for receiving combustible solid waste; a feeder coupled to the bunker and adapted to deliver combustible solid waste from the bunker to the inclined rotating grate via the cold ash bucket for incineration to generate high-temperature flue gas in a working state; an air extraction port arranged in the cold ash bucket and adapted to extract high-temperature flue gas in the working state; and a mixing mechanism, the input end of which is fluidly coupled to the air extraction port and the other end is fluidly coupled to the bunker, and the output end is fluidly coupled to the inclined rotating grate and the bunker respectively, so as to cyclically receive the high-temperature flue gas and the cold flue gas from the bunker and mix them to obtain mixed flue gas, and deliver the mixed flue gas to the bunker and the inclined rotating grate respectively via a high-temperature fan.

[0008] In some embodiments, the mixing mechanism comprises a tank body, an outer shell is mounted above the tank body, two sealing plugs and two air inlet assemblies are arranged in the outer shell, a hydraulic adjusting assembly is connected to one side of the sealing plug, a spiral channel is connected below the two hydraulic adjusting assemblies, an adjustable inner cavity is arranged between the spiral channel and the outer shell, a plurality of stirring assemblies are arranged in the spiral channel, the plurality of stirring assemblies are driven by the same transmission assembly, a mixing assembly is connected to the top end of the transmission assembly, the mixing assembly is arranged in the adjustable inner cavity and the outer shell, a petal cam is connected outside the mixing assembly, the petal cam is overlapped with two pulleys, and the two pulleys are connected with the two air inlet assemblies respectively.

[0009] In some embodiments, the boiler device further comprises a burner mounted on the furnace, the high-temperature fan is communicated with the bunker through an outlet pipeline, the bunker is arranged above the feeder, the outlet pipeline is further communicated with a flue gas chamber through a distribution pipeline, and a cold smoke pipeline is communicated with one side of the bunker; a drum grate with a toothed surface is arranged on the inclined rotating grate, the drum grate is arranged in a 3°-15° inclination from top to bottom.

[0010] In some embodiments, the lower part of the spiral channel is communicated with the high-temperature fan through a flexible pipeline, two telescopic rods are fixedly connected to the upper part of the spiral channel, and the top ends of the two telescopic rods are fixedly connected with the top wall of the tank body; a plurality of blades are fixedly connected to the upper part of the petal cam.

[0011] In some embodiments, the adjustable inner cavity comprises an upper cavity and a lower cavity, the upper cavity and the lower cavity are fixedly connected to the outer shell and the spiral channel respectively, a sealing ring is fixedly connected to the lower part of the upper cavity, and the sealing ring is overlapped with the inner wall of the lower cavity.

[0012] In some embodiments, the stirring assembly comprises a stirring rod, which is rotatably installed in the spiral channel through a bearing, and a second bevel gear is fixedly connected to one end of the stirring rod.

[0013] In some embodiments, the mixing assembly further comprises a motor, which is installed above the shell, an output shaft of the motor is fixedly connected with a stirring shaft, the petal cam is fixedly connected to the stirring shaft, and the stirring shaft is rotatably installed on the shell through a bearing.

[0014] In some embodiments, the transmission assembly comprises a polygonal rod, a top end of the polygonal rod is fixedly connected with the stirring shaft, the polygonal rod is provided with a sleeve, the sleeve is rotatably installed on the spiral channel through a bearing, a first bevel gear is fixedly connected to the sleeve, and the first bevel gear is engaged with a plurality of second bevel gears.

[0015] In some embodiments, the air inlet assembly comprises an air inlet head, a pulley is fixedly connected to the air inlet head, the air inlet head is installed on the sealing plug, one side of the air inlet head is communicated with air inlet hoses, and two air inlet hoses pass through the shell and are respectively communicated with the hot flue and the cold flue.

[0016] In some embodiments, the hydraulic adjusting assembly comprises two piston cylinders, which are installed on the shell, the piston cylinders are provided with first and second piston rods, bottom ends of the two second piston rods pass through the piston cylinders and are fixedly connected with a connecting plate, and the connecting plate is fixedly connected to the spiral channel.

[0017] The two first piston rods pass through the piston cylinders and are fixedly connected with the sealing plug, two springs are fixedly connected to one side of the sealing plug, and one end of each spring is fixedly connected with the piston cylinder.

[0018] A use method of a pulverized coal boiler system capable of directly burning combustible solid waste, comprising the following steps:

[0019] S1, the waste solid is sent into the cold ash hopper space through the feeder, the waste solid absorbs the combustion heat energy of the pulverized coal in the furnace along the inclined wall surface of the cold ash hopper, the waste solid is heated to release water, and flows into the inclined rotating grate to be incinerated, and the solid ash produced by the incineration is continuously pushed to the right side for discharge.

[0020] S2, the high-temperature flue gas produced by the incineration is extracted through the air extraction port and enters the upper shell through the air inlet head, at this time, the motor drives the stirring shaft to rotate, the stirring shaft drives the petal cam and the blade to rotate, the petal cam extrudes the pulley to drive the sealing plug to move, the sealing plug deforms the spring, when the extrusion surface of the petal cam is separated from the pulley, the spring drives the sealing plug to reset, and the petal cam extrudes the pulley again, so as to realize the reciprocating motion of the sealing plug, so that the gases discharged from the two air inlet heads are uniformly convected and stirred through the blade.

[0021] S3, the high-temperature flue gas after convection enters the upper cavity and the lower cavity downward, at this time the stirring shaft mixes, and through the reciprocating motion of the sealing plug, the first piston rod is also driven to reciprocate, then the second piston rod is driven to realize the up-down shaking of the spiral channel through the hydraulic drive, the spiral channel drives the lower cavity to move up and down, and the volume of the upper cavity and the lower cavity reciprocates to realize the pressurization of the high-temperature flue gas and the heating increase;

[0022] S4, then the high-temperature flue gas enters the spiral channel and mixes through up-down shaking, at the same time, the sleeve is driven to rotate by the rotating shaft, the sleeve drives the first bevel gear and the second bevel gear to transmit, at this time the stirring rod rotates to further mix the high-temperature flue gas, and the high-temperature flue gas flows along the spiral channel to realize multi-stage mixing;

[0023] S5, after mixing, the high-temperature flue gas enters the hot smoke pipeline through the high-temperature fan, part of the high-temperature flue gas is distributed into the flue gas chamber through the distribution pipe to serve as the oxygen required for solid waste incineration, and the other part enters the stock bin to preheat the solid waste, and then flows through the cold smoke pipeline and is discharged through another air inlet head to realize recycling.

[0024] Compared with the prior art, the present application provides a pulverized coal boiler system capable of directly mixing and burning combustible solid waste and a method thereof, and has the following beneficial effects:

[0025] 1. The pulverized coal boiler system capable of directly mixing and burning combustible solid waste and the method thereof, by combining the inclined rotating grate with the cold ash hopper of the pulverized coal boiler, the high-temperature flue gas heat in the space of the cold ash hopper is used to preheat the waste solid, and the inclined rotating grate and the high-temperature flue gas circulation are used to realize self-heating incineration of the solid waste, so that the technology has high solid waste treatment efficiency, wide adaptability, reduces the investment in the construction of a solid waste incinerator, and greatly reduces the operation cost. At the same time, the direct mixing and burning technology of non-fossil biomass mixture can realize that the biomass mixing and burning amount accounts for more than 20% of the total amount of boiler coal, has a significant fuel adaptability advantage, and does not need large-scale modification of the existing coal-fired unit to be compatible with biomass fuels of different calorific values and humidities, and is especially suitable for efficient consumption of regional surplus biomass resources such as straw and rice husk.

[0026] 2. When the flue gas is mixed, the petal cam is driven by the mixing assembly to cooperate with the hydraulic adjusting assembly to realize the reciprocating motion of the sealing plug, so that the air inlet position of the air inlet head can be changed, the convection effect of the flue gas is enhanced, the high-temperature flue gas flows spirally in the spiral channel, and the multi-stage mixing of the high-temperature flue gas is realized through the cooperation of the stirring assembly, so that the mixing efficiency is improved.

[0027] 3. The pulverized coal boiler system and method for directly burning combustible solid waste, by driving the petal cam to rotate through the stirring assembly, the petal cam extruding the pulley and cooperating with the hydraulic adjusting assembly to realize the movement of the sealing plug, the sealing plug driving the hydraulic adjusting assembly to shake up and down through the hydraulic drive spiral channel, so as to facilitate the mixing of high-temperature flue gas inside the spiral channel, and the spiral channel drives the adjustable inner cavity to move, so that the volume of the adjustable inner cavity changes continuously, so that the high-temperature flue gas can be pressurized, and the high-temperature flue gas molecules can be exchanged frequently and more intensely, thereby achieving a certain heating effect, thereby improving the waste heat recovery effect.

[0028] 4. The pulverized coal boiler system and method for directly burning combustible solid waste, by discharging flue gas relative to the two air inlet assemblies, so that the flue gas convection is realized, and the mixing assembly drives the petal cam to rotate, so that the petal cam cooperates with the hydraulic adjusting assembly to drive the sealing plug to reciprocate, thereby greatly improving the convection effect and facilitating subsequent mixing operation. After convection, the flue gas can be mixed and preliminarily treated, and then the hydraulic adjusting assembly drives the spiral channel to shake up and down, so that the adjustable inner cavity moves, and the high-temperature flue gas molecules can be further pressurized and collide violently, thereby increasing the high-temperature flue gas heat energy. With the high-temperature flue gas entering the spiral channel to flow spirally, the multi-stage mixing can be realized through the stirring assembly, and the mixing effect can be further improved by cooperating with the spiral channel to shake up and down, so that the high-temperature flue gas is uniformly output to achieve the heating effect. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A flow chart of a pulverized coal boiler system for directly burning combustible solid waste is provided for the present application.

[0030] Figure 2 A mixing mechanism perspective view of a pulverized coal boiler system for directly burning combustible solid waste is provided for the present application.

[0031] Figure 3 A tank body perspective view of a pulverized coal boiler system for directly burning combustible solid waste is provided for the present application.

[0032] Figure 4 A perspective view of an adjustable inner cavity and a spiral channel connection of a pulverized coal boiler system for directly burning combustible solid waste is provided for the present application.

[0033] Figure 5 A perspective view of an adjustable inner cavity cross-section of a pulverized coal boiler system for directly burning combustible solid waste is provided for the present application.

[0034] Figure 6 A perspective view of an upper shell cross-section of a pulverized coal boiler system for directly burning combustible solid waste is provided for the present application.

[0035] Figure 7 A perspective view of a spiral channel profile of a pulverized coal boiler system capable of directly mixing and burning combustible solid waste according to the present application;

[0036] Figure 8 A perspective view of a hydraulic regulating assembly connected to a sealing plug of a pulverized coal boiler system capable of directly mixing and burning combustible solid waste according to the present application;

[0037] Figure 9 A perspective view of a mixing assembly of a pulverized coal boiler system capable of directly mixing and burning combustible solid waste according to the present application;

[0038] Figure 10 A perspective view of an air inlet assembly connected to a sealing plug of a pulverized coal boiler system capable of directly mixing and burning combustible solid waste according to the present application;

[0039] Figure 11 A perspective view of a hydraulic regulating assembly profile of a pulverized coal boiler system capable of directly mixing and burning combustible solid waste according to the present application.

[0040] In the figure: 100, boiler device; 101, furnace; 102, cold ash hopper; 103, bunker; 104, feeder; 105, burner; 106, mixing mechanism; 1061, tank body; 1062, outer shell; 1063, adjustable inner cavity; 10631, lower cavity; 10632, sealing ring; 10633, upper cavity; 1064, hose pipe; 1065, mixing assembly; 10651, motor; 10652, stirring shaft; 1066, hydraulic regulating assembly; 10661, first piston rod; 10662, spring; 10663, piston cylinder; 10664, second piston rod; 10665, connecting plate; 1067, stirring assembly; 10671, second bevel gear; 10672, stirring rod; 1068, transmission assembly; 10681, multi-edge rod; 10682, sleeve; 10683, first bevel gear; 1069, air inlet assembly; 10691, air inlet head; 10692, air inlet hose; 10610, pulley; 10611, sealing plug; 10612, telescopic rod; 10613, petal cam; 10614, blade; 10615, spiral channel; 107, air extraction port; 108, inclined rotary grate; 109, distribution pipe; 110, flue gas chamber; 111, high-temperature fan; 112, outlet pipe; 113, cold flue pipe; 114, hot flue pipe. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0042] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The working state of the pulverized coal boiler system mentioned in various embodiments of the present application is the working state.

[0043] With reference to Figures 1 to 10 A pulverized coal boiler system capable of directly blending and burning combustible solid waste, comprising a boiler device 100, the boiler device 100 comprising a furnace 101, a burner 105, a cold ash hopper 102, a bunker 103, a feeder 104, a mixing mechanism 106, a high-temperature fan 111, an air extraction port 107, an inclined rotary grate 108 and a flue gas chamber 110. The cold ash hopper 102 is arranged below the furnace 101, and the feeder 104 is arranged on one side of the cold ash hopper 102. Through the feeder 104, the combustible solid waste or other any suitable fuel in the bunker 103 can be smoothly input into the cold ash hopper 102, thereby achieving the purpose of feeding.

[0044] With reference to Figures 1 to 10 The flue gas chamber 110 and the inclined rotary grate 108 are arranged at the bottom of the cold ash hopper 102, and the air extraction port 107 is arranged in the cold ash hopper 102. The air extraction port 107 can guide the high-temperature flue gas into the mixing mechanism 106, facilitating the mixing operation of the high-temperature flue gas. The air extraction port 107 is connected with the mixing mechanism 106 through a hot flue gas pipeline 114 penetrating out of the cold ash hopper 102. The mixing mechanism 106 is connected with the high-temperature fan 111 below. Through the high-temperature fan 111, the high-temperature flue gas can be transported, so that the high-temperature flue gas can be smoothly input into the flue gas chamber 110 and the bunker 103. The burner 105 is installed on the furnace 101. The high-temperature fan 111 is communicated with the bunker 103 through an outlet pipeline 112. Through the outlet pipeline 112, the high-temperature flue gas can be transported into the bunker 103 to heat the solid waste, facilitating the separation of moisture.

[0045] In one embodiment, the bunker 103 is arranged above the feeder 104, which can be a shaftless auger feeder for example. The outlet pipe 112 also communicates with the flue gas chamber 110 through a distribution pipe 109, through which part of the high-temperature flue gas is distributed into the flue gas chamber 110 to provide oxygen for the incineration of solid waste. One side of the bunker 103 is connected with a cold flue pipe 113 through which the flue gas can be guided to flow back into the mixing mechanism 106 for recycling. The inclined rotating grate 108 is provided with a toothed surface drum grate, which is arranged in a 3°-15° inclined manner from top to bottom. The waste solid is turned over and stirred under the action of the rotation and undulating surface of the drum grate, and fully contacts the high-temperature mixed flue gas from the flue gas chamber 110 below to burn. Secondly, according to the separate chambers of the drum grate, the residence time and combustion of the garbage or combustible solid waste on the grate can be controlled by adjusting the rotation speed of the drum grate and the amount of high-temperature mixed flue gas.

[0046] In some embodiments, as Figures 1 to 10As shown, the mixing mechanism 106 creatively put forward by the present disclosure can include a tank body 1061, an upper portion of the tank body 1061 can be provided with a shell 1062, two sealing plugs 10611 and two air inlet assemblies 1069 are arranged in the shell 1062, the air inlet assembly 1069 includes an air inlet head 10691, a pulley 10610 is fixedly connected to the air inlet head 10691, and the two air inlet heads 10691 are oppositely arranged, so that the convection operation of the high-temperature flue gas can be realized, which is beneficial to the mixing operation, the air inlet head 10691 is installed on the sealing plug 10611, one side of the sealing plug 10611 is fixedly connected with two springs 10662, one end of the spring 10662 is fixedly connected with a piston cylinder 10663, one side of the air inlet head 10691 is communicated with an air inlet hose 10692, the air inlet hose 10692 can be used to convey the high-temperature flue gas into the upper shell, and the air inlet hose 10692 is telescopic, so that the sealing plug 10611 can be smoothly moved, the two air inlet hoses 10692 pass out of the shell 1062 and are respectively communicated with the hot smoke pipeline 114 and the cold smoke pipeline 113, one side of the sealing plug 10611 is connected with a hydraulic adjusting assembly 1066, two hydraulic adjusting assemblies 1066 are connected below the spiral channel 10615, the spiral shape of the spiral channel 10615 enables the high-temperature flue gas to flow spirally, so as to facilitate the multi-stage mixing operation of the high-temperature flue gas by the stirring assembly 1067, the lower portion of the spiral channel 10615 is communicated with the high-temperature fan 111 through a hose 1064, the movable nature of the hose 1064 enables the spiral channel 10615 to be smoothly moved, the upper portion of the spiral channel 10615 is fixedly connected with two telescopic rods 10612, the telescopic rods 10612 can guide the spiral channel 10615 and keep the spiral channel 10615 stably moved up and down, the top ends of the two telescopic rods 10612 are fixedly connected with the top wall of the tank body 1061, an adjustable inner cavity 1063 is arranged between the spiral channel 10615 and the shell 1062, a plurality of stirring assemblies 1067 are arranged in the spiral channel 10615, the stirring assembly 1067 includes a stirring rod 10672, the stirring rod 10672 can be used to mix and process the high-temperature flue gas passing through, the stirring rod 10672 is rotatably installed in the spiral channel 10615 through a bearing, and one end of the stirring rod 10672 is fixedly connected with a second bevel gear 10671;

[0047] In some embodiments, continuing to refer to Figures 1 to 10The plurality of stirring assemblies 1067 are driven by the same transmission assembly 1068, the transmission assembly 1068 comprises a polygonal rod 10681, the top end of the polygonal rod 10681 is fixedly connected with the stirring shaft 10652, the polygonal rod 10681 is sleeved with a sleeve 10682, the sleeve 10682 can slide on the polygonal rod 10681, so that the spiral channel 10615 can smoothly move, meanwhile, the polygonal rod 10681 is a polygonal structure, and the shape of the sleeve 10682 is matched with the shape of the polygonal rod 10681, so that the polygonal rod 10681 can smoothly drive the sleeve 10682 to rotate, the sleeve 10682 is rotatably installed on the spiral channel 10615 through a bearing, a first bevel gear 10683 is fixedly connected on the sleeve 10682, the first bevel gear 10683 is engaged with a plurality of second bevel gears 10671, and the top end of the transmission assembly 1068 is connected with a mixing assembly 1065, the mixing assembly 1065 comprises a motor 10651, the motor 10651 is installed above the shell 1062, the output shaft of the motor 10651 is fixedly connected with the stirring shaft 10652, the stirring shaft 10652 is driven to rotate by the motor 10651, so that the stirring shaft 10652 can mix the high-temperature flue gas, the petal cam 10613 is fixedly connected on the stirring shaft 10652, the stirring shaft 10652 is rotatably installed on the shell 1062 through a bearing, the mixing assembly 1065 is arranged in the adjustable inner cavity 1063 and the shell 1062, the mixing assembly 1065 is externally connected with the petal cam 10613, a plurality of blades 10614 are fixedly connected above the petal cam 10613, the blades 10614 can generate turbulence when the high-temperature flue gas convection, which is beneficial to the mixing operation, the petal cam 10613 is overlapped with the two pulleys 10610, and the two pulleys 10610 are respectively connected with the two air inlet assemblies 1069.

[0048] In this embodiment, by combining the inclined rotating grate 108 with the coal-fired boiler cold ash bucket 102, the high-temperature flue gas heat in the cold ash bucket 102 space is used to preheat the waste solid, and the inclined rotating grate 108 and the high-temperature flue gas circulation are used to perform self-heating incineration of solid waste. Therefore, the technology has high solid waste treatment efficiency, wide adaptation range, reduces the investment in the construction of a solid waste incinerator, and greatly reduces the operation cost. Secondly, when the flue gas backflow mixes, the motor 10651 drives the stirring shaft 10652 to rotate, the stirring shaft 10652 drives the petal cam 10613 to rotate, the petal cam 10613 extrudes the pulley 10610 and cooperates with the spring 10662 to realize the sealing plug 10611, realizes the reciprocating motion of the sealing plug 10611, and further changes the air inlet position of the air inlet head 10691, enhances the convection effect of the flue gas, and the high-temperature flue gas enters the spiral channel 10615 to flow spirally, so that the stirring shaft 10652 can drive the sleeve 10682 to rotate through the polygonal rod 10681, the sleeve 10682 is driven by the first bevel gear 10683 and the second bevel gear 10671, the second bevel gear 10671 drives the stirring rod 10672 to rotate, and the high-temperature flue gas spirally flows through the stirring rod 10672 multiple times to realize multi-stage mixing operation, thereby improving the mixing efficiency.

[0049] In one embodiment, with reference to Figure 5 and Figure 11 A coal-fired boiler system capable of directly burning combustible solid waste includes an adjustable inner cavity 1063, the adjustable inner cavity 1063 includes an upper cavity 10633 and a lower cavity 10631, the upper cavity 10633 and the lower cavity 10631 are fixedly connected to the outer shell 1062 and the spiral channel 10615 respectively, a sealing ring 10632 is fixedly connected below the upper cavity 10633, the sealing ring 10632 can maintain the sealing property of the upper cavity 10633 and the lower cavity 10631, the sealing ring 10632 overlaps with the inner wall of the lower cavity 10631, two sealing plugs 10611 and two air inlet assemblies 1069 are arranged in the outer shell 1062, a petal cam 10613 is externally connected to the mixing assembly 1065, the petal cam 10613 overlaps with the two pulleys 10610, the pulleys 10610 can reduce frictional resistance and wear by extrusion between the petal cam 10613 and the pulleys 10610, and the petal cam 10613 overlaps with the two pulleys 10610;

[0050] In this embodiment, the hydraulic adjusting assembly 1066 includes two piston cylinders 10663 mounted on the shell 1062, the first piston rod 10661 and the second piston rod 10664 are arranged in the piston cylinder 10663, the bottom ends of the two second piston rods 10664 pass through the piston cylinder 10663 and are fixedly connected with the connecting plate 10665, the connecting plate 10665 is fixedly connected on the spiral channel 10615, the two first piston rods 10661 pass through the piston cylinder 10663 and are fixedly connected with the sealing plug 10611, one side of the sealing plug 10611 is fixedly connected with the two springs 10662, one end of the spring 10662 is fixedly connected with the piston cylinder 10663.

[0051] In this embodiment, the petal cam 10613 is driven to rotate by the stirring assembly 1067, the petal cam 10613 extrudes the pulley 10610 and cooperates with the spring 10662 to realize the reciprocating motion of the sealing plug 10611, the sealing plug 10611 drives the first piston rod 10661 to move, the first piston rod 10661 drives the second piston rod 10664 to move through hydraulic drive, the second piston rod 10664 drives the spiral channel 10615 to move up and down through the connecting plate 10665, so as to facilitate the mixing of the high-temperature flue gas in the spiral channel 10615, and the spiral channel 10615 also drives the lower cavity 10631 to move up and down, so that the volume of the lower cavity 10631 changes continuously, so as to realize the pressurization of the high-temperature flue gas, so that the high-temperature flue gas molecules frequently and more intensely exchange, so as to achieve a certain heating effect, thereby improving the waste heat recovery effect.

[0052] In some embodiments, referring to Figures 4 to 8 A pulverized coal boiler system capable of directly burning combustible solid waste, comprising a mixing mechanism 106, the mixing mechanism 106 comprising a tank body 1061, an outer shell 1062 is installed above the tank body 1061, two sealing plugs 10611 and two air inlet assemblies 1069 are arranged in the outer shell 1062, a hydraulic adjusting assembly 1066 is connected to one side of the sealing plug 10611, a spiral channel 10615 is connected below the two hydraulic adjusting assemblies 1066, an adjustable inner cavity 1063 is arranged between the spiral channel 10615 and the outer shell 1062, a plurality of stirring assemblies 1067 are arranged in the spiral channel 10615, the plurality of stirring assemblies 1067 are driven by the same transmission assembly 1068, a mixing assembly 1065 is connected to the top end of the transmission assembly 1068, the mixing assembly 1065 is arranged in the adjustable inner cavity 1063 and the outer shell 1062, a petal cam 10613 is connected outside the mixing assembly 1065, the petal cam 10613 is lapped with two pulleys 10610, and the two pulleys 10610 are respectively connected with the two air inlet assemblies 1069.

[0053] In this embodiment, the flue gas is made to flow countercurrently by the two air inlet assemblies 1069, and the petal cam 10613 is made to rotate by the mixing assembly 1065, so that the petal cam 10613 cooperates with the hydraulic adjusting assembly 1066 to drive the sealing plug 10611 to reciprocate, thereby greatly improving the countercurrent effect and facilitating subsequent mixing operation. After countercurrent flow, the flue gas can be subjected to preliminary mixing, and then the hydraulic adjusting assembly 1066 drives the spiral channel 10615 to shake up and down, so that the inner cavity 1063 can move, and the molecules of the high-temperature flue gas can be subjected to violent collision, thereby increasing the heat energy of the high-temperature flue gas. The high-temperature flue gas enters the spiral channel 10615 to flow spirally, so that the multi-stage mixing can be realized by the stirring assembly 1067, and the mixing effect can be further improved by the up-and-down shaking of the spiral channel 10615, so that the high-temperature flue gas can be uniformly output to achieve the heating effect.

[0054] In one embodiment, a method of using a pulverized coal boiler system that can directly co-fire combustible solid waste includes the following steps:

[0055] S1, the waste solid is sent into the cold ash bucket 102 space by the feeder 104, and the waste solid absorbs the heat energy of the combustion of the pulverized coal in the hearth 101 along the inclined wall of the cold ash bucket 102, and the waste solid is heated to release water, and flows into the inclined rotary grate 108 to be incinerated, and the solid ash produced by incineration is continuously pushed out to the right side;

[0056] S2, the high-temperature flue gas generated by incineration is extracted through the air extraction port 107 and enters the upper shell through the air inlet head 10691. At this time, the stirring shaft 10652 is driven to rotate by the motor 10651, the petal cam 10613 and the blade 10614 are rotated by the stirring shaft 10652, the petal cam 10613 is extruded to the pulley 10610 to drive the sealing plug 10611 to move, the sealing plug 10611 deforms the spring 10662, when the petal cam 10613 extrusion surface is separated from the pulley 10610, the spring 10662 drives the sealing plug 10611 to reset, until the petal cam 10613 extrudes the pulley 10610 again, so as to realize the reciprocating motion of the sealing plug 10611, so that the gases discharged from the two air inlet heads 10691 flow uniformly and are stirred by the blade 10614;

[0057] S3, the high-temperature flue gas after countercurrent flow enters the upper cavity 10633 and the lower cavity 10631 downward, at this time the stirring shaft 10652 is mixed, and the reciprocating motion of the sealing plug 10611 also drives the first piston rod 10661 to reciprocate, so that the second piston rod 10664 is driven by the hydraulic pressure to realize the up-and-down shaking of the spiral channel 10615, so that the spiral channel 10615 drives the lower cavity 10631 to move up and down, and the volume of the upper cavity 10633 and the lower cavity 10631 changes to realize the pressurization of the high-temperature flue gas to increase the heat;

[0058] S4, then the high temperature flue gas into the spiral channel 10615, and by up and down shaking mixing, while through the shaft drive polygonal rod 10681 driven sleeve 10682 rotation, sleeve 10682 drive the first umbrella tooth 10683 and the second umbrella tooth 10671 transmission, at this time the stirring rod 10672 rotation further to the high temperature flue gas mixing, make high temperature flue gas along the spiral channel 10615 flow for multi-stage mixing;

[0059] S5, after mixing, through the high temperature fan 111 into the hot smoke pipeline 114, a part through the distribution pipe 109 shunt into the flue gas chamber 110, as the required oxygen for solid waste incineration, another part into the bunker 103 to preheat the solid waste, and then flow through the cold smoke pipeline 113, and through another air inlet head 10691 discharge, in this way for recycling.

[0060] According to various embodiments of the present application, the pulverized coal boiler system and method for directly mixing combustible solid waste can at least achieve the following technical effects: by combining the inclined rotating grate with the cold ash hopper of the pulverized coal boiler, the high-temperature flue gas heat in the cold ash hopper space is used to preheat the waste solid, and the inclined rotating grate and the high-temperature flue gas circulation are used for self-heating incineration of the solid waste, so that the technical effects of high efficiency of solid waste treatment, wide adaptability, reduced investment in the construction of a solid waste incinerator, and greatly reduced operation cost are achieved. When the flue gas backflow is mixed, the reciprocating motion of the sealing plug is realized by the cooperation of the petal cam driven by the mixing assembly and the hydraulic adjusting assembly, and then the air inlet position of the air inlet head can be changed to enhance the convection effect of the flue gas. The high-temperature flue gas enters the spiral channel and flows spirally, and the multi-stage mixing of the high-temperature flue gas is realized by cooperating with the stirring assembly to improve the mixing efficiency. The pulverized coal boiler system and method for directly mixing combustible solid waste can realize the movement of the sealing plug by the petal cam rotating driven by the stirring assembly, the petal cam extruding the pulley, and cooperating with the hydraulic adjusting assembly, and the hydraulic adjusting assembly driven by the sealing plug is shaken up and down in the spiral channel by the hydraulic drive, which is beneficial to the mixing of the high-temperature flue gas in the spiral channel. Moreover, the adjustable inner cavity is moved by the spiral channel, so that the volume of the adjustable inner cavity is constantly changed, which can realize the pressurization of the high-temperature flue gas, so that the molecules of the high-temperature flue gas are frequently and more violently exchanged, thereby achieving a certain heating effect, thereby improving the waste heat recovery and utilization effect. The pulverized coal boiler system and method for directly mixing combustible solid waste can make the flue gas flow by the relative discharge of the two air inlet assemblies, and at the same time, the petal cam is rotated by the mixing assembly, so that the petal cam cooperates with the hydraulic adjusting assembly to drive the reciprocating motion of the sealing plug, thereby greatly improving the convection effect and being beneficial to the subsequent mixing operation. After convection, the flue gas can be preliminarily mixed by the mixing assembly, and then the adjustable inner cavity is moved by the hydraulic adjusting assembly shaking the spiral channel up and down, so that the molecules of the high-temperature flue gas are further pressurized and violently collided, thereby increasing the heat energy of the high-temperature flue gas. With the high-temperature flue gas entering the spiral channel and spirally flowing, multi-stage mixing can be realized by the stirring assembly, and the mixing effect can be further improved by cooperating with the spiral channel shaking up and down, so that the high-temperature flue gas is uniformly output to achieve the heating effect.

[0061] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A pulverized coal boiler system capable of directly co-firing combustible solid waste, comprising a boiler unit (100), characterized in that, The boiler unit (100) includes: Furnace (101); A cold ash hopper (102) is disposed below the furnace chamber (101); An inclined rotating grate (108) is disposed below the cold ash hopper (102); The silo (103) is used to receive combustible solid waste; A feeder (104) is coupled to the silo (103) and is adapted to deliver combustible solid waste from the silo (103) via the cold ash hopper (102) to the inclined rotary grate (108) for incineration to generate high-temperature flue gas in operation. An exhaust port (107) is disposed in the cold ash hopper (102) and is adapted to extract high-temperature flue gas in the operating state; and The mixing mechanism (106) has one fluid input connected to the exhaust port (107) and another fluid input connected to the silo (103), and its output fluid input connected to the inclined rotary grate (108) and the silo (103) respectively. This allows it to cyclically receive the high-temperature flue gas and the cold flue gas from the silo (103) and mix them to obtain mixed flue gas. The mixed flue gas is then delivered to the silo (103) and the inclined rotary grate (108) respectively via a high-temperature fan (111). The mixing mechanism (106) includes a tank (1061), with a shell (1062) mounted on top of the tank (1061). The shell (1062) contains two sealing plugs (10611) and two air inlet assemblies (1069). One side of each sealing plug (10611) is connected to a hydraulic system. The adjustment assembly (1066) has a spiral channel (10615) connected below the two hydraulic adjustment assemblies (1066). An adjustable inner cavity (1063) is provided between the spiral channel (10615) and the outer shell (1062). Multiple stirring assemblies (1067) are provided in the spiral channel (10615). The multiple stirring assemblies (1067) are driven by the same transmission assembly (1068). A mixing assembly (1065) is connected to the top of the transmission assembly (1068). The mixing assembly (1065) is located in the adjustable inner cavity (1063) and the outer shell (1062). A petal cam (10613) is connected to the outside of the mixing assembly (1065). The petal cam (10613) overlaps with two pulleys (10610). The two pulleys (10610) are respectively connected to two air intake assemblies (1069).

2. A pulverized coal boiler system capable of directly co-firing combustible solid waste according to claim 1, characterized in that, The boiler unit (100) further includes a burner (105) mounted on the furnace (101). A high-temperature fan (111) is connected to a hopper (103) via an outlet pipe (112). The hopper (103) is positioned above the feeder (104). The outlet pipe (112) is also connected to a flue gas chamber (110) via a distribution pipe (109). One side of the hopper (103) is connected to the mixing mechanism (106) via a cold flue gas pipe (113). The inclined rotating grate (108) is equipped with a toothed drum grate, which is arranged at an angle of 3°-15° from top to bottom.

3. A pulverized coal boiler system capable of directly co-firing combustible solid waste according to claim 1, characterized in that, The lower part of the spiral channel (10615) is connected to the high-temperature fan (111) via a flexible pipe (1064), and two telescopic rods (10612) are fixedly connected to the upper part of the spiral channel (10615). The top ends of the two telescopic rods (10612) are fixedly connected to the top wall of the tank (1061); and Multiple blades (10614) are fixedly connected above the petal cam (10613).

4. A pulverized coal boiler system capable of directly co-firing combustible solid waste according to claim 1 or 3, characterized in that, The adjustable inner cavity (1063) includes an upper cavity (10633) and a lower cavity (10631), which are fixedly connected to the outer shell (1062) and the spiral channel (10615), respectively. A sealing ring (10632) is fixedly connected to the lower part of the upper cavity (10633), and the sealing ring (10632) overlaps with the inner wall of the lower cavity (10631). The stirring assembly (1067) includes a stirring rod (10672), which is rotatably mounted in the spiral channel (10615) via a bearing, and a second bevel tooth (10671) is fixedly connected to one end of the stirring rod (10672).

5. A pulverized coal boiler system capable of directly co-firing combustible solid waste according to claim 4, characterized in that, The mixing assembly (1065) also includes a motor (10651), which is mounted above the housing (1062). The output shaft of the motor (10651) is fixedly connected to a stirring shaft (10652). The petal cam (10613) is fixedly connected to the stirring shaft (10652). The stirring shaft (10652) is rotatably mounted on the housing (1062) via bearings.

6. A pulverized coal boiler system capable of directly co-firing combustible solid waste according to claim 5, characterized in that, The transmission assembly (1068) includes a polygonal rod (10681), the top end of which is fixedly connected to the stirring shaft (10652). A sleeve (10682) is fitted over the polygonal rod (10681). The sleeve (10682) is rotatably mounted on the spiral channel (10615) via a bearing. A first bevel tooth (10683) is fixedly connected to the sleeve (10682). The first bevel tooth (10683) meshes with a plurality of second bevel teeth (10671).

7. A pulverized coal boiler system capable of directly co-firing combustible solid waste according to claim 6, characterized in that, The air intake assembly (1069) includes an air intake head (10691), a pulley (10610) is fixedly connected to the air intake head (10691), the air intake head (10691) is mounted on a sealing plug (10611), and an air intake hose (10692) is connected to one side of the air intake head (10691). Two air intake hoses (10692) extend out of the outer shell (1062) and are respectively connected to the hot smoke pipe (114) and the cold smoke pipe (113).

8. A pulverized coal boiler system capable of directly co-firing combustible solid waste according to claim 7, characterized in that, The hydraulic adjustment assembly (1066) includes two piston cylinders (10663), which are mounted on the outer casing (1062). A first piston rod (10661) and a second piston rod (10664) are disposed within each piston cylinder (10663). The bottom ends of the two second piston rods (10664) protrude from the piston cylinders (10663) and are fixedly connected to a connecting plate (10665). The connecting plate (10665) is fixedly connected to the spiral channel (10615). Two first piston rods (10661) extend out of the piston cylinder (10663) and are fixedly connected to the sealing plug (10611). Two springs (10662) are fixedly connected to one side of the sealing plug (10611), and one end of the springs (10662) is fixedly connected to the piston cylinder (10663).

9. The method of using a pulverized coal boiler system capable of directly co-firing combustible solid waste according to claim 8, characterized in that, Includes the following steps: S1. Waste solids are fed into the space of cold ash hopper (102) by feeder (104). The waste solids absorb the combustion heat energy of coal powder in furnace (101) along the inclined wall of cold ash hopper (102). The waste solids are heated and release water, which flows into the inclined rotating grate (108) for incineration. The solid ash produced by incineration is continuously pushed into the right side for discharge. S2. The high-temperature flue gas generated by combustion is extracted through the exhaust port (107) and enters the upper shell through the intake head (10691). At this time, the stirring shaft (10652) is driven to rotate by the motor (10651). The stirring shaft (10652) drives the petal cam (10613) and the blade (10614) to rotate. The petal cam (10613) squeezes the pulley (10610) to drive the sealing plug (10611) to move. The sealing plug (10611) The spring (10662) is deformed. When the pressing surface of the petal cam (10613) separates from the pulley (10610), the spring (10662) drives the sealing plug (10611) to reset until the petal cam (10613) presses the pulley (10610) again, thereby realizing the reciprocating motion of the sealing plug (10611), so that the gas discharged from the two air inlets (10691) is evenly convected and stirred by the blades (10614); S3. The high-temperature flue gas after convection is directed downward into the upper chamber (10633) and the lower chamber (10631). At this time, the stirring shaft (10652) mixes the gas, and the reciprocating motion of the sealing plug (10611) also drives the first piston rod (10661) to reciprocate. The second piston rod (10664) is then hydraulically driven to make the spiral channel (10615) swing up and down, which in turn drives the lower chamber (10631) to move up and down. The volume of the upper chamber (10633) and the lower chamber (10631) changes back and forth to pressurize the high-temperature flue gas and heat it up. S4. Then, the high-temperature flue gas enters the spiral channel (10615) and is mixed by shaking up and down. At the same time, the rotating shaft drives the polygonal rod (10681) to drive the sleeve (10682) to rotate, so that the sleeve (10682) drives the first bevel tooth (10683) and the second bevel tooth (10671) to drive. At this time, the stirring rod (10672) rotates to further mix the high-temperature flue gas, so that the high-temperature flue gas flows along the spiral channel (10615) for multi-stage mixing. S5. After mixing, the mixture enters the hot flue pipe (114) through the high-temperature fan (111). Part of it is diverted into the flue gas chamber (110) through the distribution pipe (109) to provide oxygen for the incineration of solid waste. The other part enters the silo (103) to preheat the solid waste. Then it flows through the cold flue pipe (113) and is discharged through another air inlet (10691) for recycling.

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