612results about "Solid fuel combustion" patented technology

The invention relates to a chemical looping combustion variable load system based on flue gas recirculation and a control method. The system comprises a chemical looping combustion system and a flue gas recirculation system (7), the chemical looping combustion system comprises an air reactor (1), a fuel reactor (2), an AR cyclone separator (3), an FR cyclone separator (4), an AR material return device (5), an FR material return device (6), an air supply system (8) and a fuel supply system (9). By controlling the flow and temperature of recirculated flue gas of the flue gas recirculating system and cooperatively controlling the opening degree of the conical valve and the circulating flux of the system, the load of the chemical looping combustion system is flexibly adjusted, the energy consumption is reduced, the efficiency is improved, and the operation cost is reduced; and the rest high-temperature flue gas enters a flue gas treatment system to be treated, high-purity CO2 gas is obtained after heat exchange, condensation and purification, and finally efficient combustion of fuel and low-energy-consumption carbon capture are achieved.

The invention discloses a biomass blending combustion coal-fired power generation system and method based on low-temperature aerobic upgrading. The system comprises a biomass bin, and a crushing unit is arranged at a discharge port of the biomass bin; the discharging end of the crushing unit is sequentially connected with a low-temperature aerobic upgrading device, a coal bunker unit and a coal mill through a conveying mechanism; the coal mill is connected with a coal-fired boiler, and the coal-fired boiler is provided with an SCR reactor; a heat source inlet of the low-temperature aerobic upgrading device is connected to a tail flue behind the SCR reactor, and tail flue gas of the SCR reactor is used for heating; tail gas of the low-temperature aerobic upgrading device is conveyed to the coal-fired boiler through the centrifugal fan to be combusted and purified, and the system achieves real-time monitoring and control through the central control system and the monitoring unit. According to the invention, high-efficiency and low-cost treatment can be carried out on the biomass, the problems of moisture content, high volatile components, grindability and the like of the biomass are effectively improved while the high energy recovery rate is reserved, and large-scale stable blending combustion of the biomass in a large coal-fired boiler is realized.

The invention discloses an air preheating biomass boiler, belongs to the technical field of boilers, and aims to solve the problems of low combustion efficiency, insufficient flue gas waste heat utilization and particulate matter emission of a traditional biomass boiler. Function optimization is achieved through a main body structure composed of a furnace body, a charging barrel and a rotating pipe, a double-spiral-disc heat exchange assembly is arranged in the charging barrel, biomass fuel is preheated through boiler exhaust smoke waste heat, meanwhile, smoke is discharged through exhaust holes after being distributed through spiral disc gas storage cavities, and unburned particles are filtered by a biomass layer and carried to a hearth to be subjected to secondary combustion; an air inlet cavity is formed in the rotating pipe, and air is preheated through the fixed pipe and the first connecting pipe and then input into the hearth. The exhaust assembly adopts a sliding rod and sealing block matched structure, and a convex block mechanism driven by a rotating pipe drives the sealing block to periodically move, so that gas in the charging barrel is intermittently exhausted through a double-layer filter screen. According to the boiler, the heat efficiency is improved through a smoke-air two-way preheating and particulate matter secondary combustion mechanism, and the biomass preheating, air heating and emission treatment process is optimized.

A flow channel controller of a visual solid propellant high-pressure combustion device relates to the technical field of solid propellant high-pressure combustion devices and comprises an annular cylinder, a middle cavity of the annular cylinder is a central circulation channel, and the wall of the annular cylinder is composed of a plurality of flow channel controller concave parts and flow channel controller convex parts which are alternately and annularly distributed in sequence; the concave part of the flow channel controller forms circulating backflow flow channels, and each circulating backflow flow channel is communicated with the central circulation channel; the flow channel controller protruding part is used for changing the flowing direction of internal circulation gas, and the interior of the flow channel controller protruding part is a hollow groove body used for reducing weight. After the internal circulation flowing gas impacts the upper flange end cover of the high-pressure combustion chamber, the airflow flowing area is adjusted through the flow channel controller, and the situation that particles carried by the internal circulation flowing gas affect the observation view range is avoided.

The present application relates to solid waste treatment technical field, especially a reciprocating mechanical grate furnace and grate jam determination processing method, real-time collection of the motion parameters of the reciprocating grate; based on the above motion parameters, in the automatic mode operation process, the grate jam determination module determines whether the sliding grate of each stage occurs jam failure; if it is determined that the jam failure occurs, the system switches to the automatic emergency processing mode operation, and the grate jam automatic emergency processing module automatically handles the jam failure; when the factors of the jam failure disappear, the motion mode of the sliding grate of this stage is switched to the automatic mode, and the grate jam flag is automatically reset; the reciprocating grate jam is determined, and appropriate automatic emergency processing is made, the influence of mechanical jam caused by metal parts, bricks and stones and the like on the stable and continuous operation of the reciprocating grate furnace is reduced, and the comprehensive benefits of general industrial solid waste treatment plants are improved.

The invention discloses a biomass double-hearth combustion furnace with a direct-flow burner and a rotational-flow burner arranged at the bottom, and relates to the technical field of combustion equipment. The problems that an existing combustion device is insufficient in adaptability to the particle size of biomass particles, and large-particle biomass is difficult to burn out completely are solved. A direct-current burner is connected with the outer wall of an inner-layer furnace and the inner wall of an outer-layer furnace through a posture adjusting assembly, a turbulent burner and an inner-layer furnace combustion chamber which are embedded inside and outside are installed at the bottom of the inner-layer furnace, a through turbulent burner is installed at the bottom of the inner-layer furnace combustion chamber, and a third smoke exhaust channel is formed in the upper portion of the inner-layer furnace. An outlet of a first smoke exhaust channel in the upper portion of the outer-layer furnace is communicated with a third smoke exhaust channel, an outlet of a second smoke exhaust channel is communicated with an inlet of a cyclone separator, an outlet in the upper end of the cyclone separator is communicated with an inlet of a turbulent burner through a combustible gas connecting pipeline, and an outlet in the lower end of the cyclone separator is communicated with a combustion chamber of the inner-layer furnace through a carbon residue channel. The biomass burner is used for achieving sufficient burning of large-particle biomass, and the burn-off rate is increased.

The invention provides a high-temperature heat storage method and system of a coupling peak regulation boiler. The method comprises the steps that hot flue gas of the peak shaving boiler and a low-temperature solid particle heat storage material are mixed and subjected to heat exchange, and a high-temperature solid particle heat storage material is obtained; the high-temperature solid particle heat storage material is stored in a heat preservation mode; the high-temperature solid particle heat storage material exchanges heat with water or water vapor to generate high-temperature steam, and at least part of the high-temperature steam is used for power generation; carrying out mixed heat exchange on the high-temperature solid particle heat storage material and gas to obtain high-temperature flue gas; and at least part of the high-temperature flue gas is sent back into the peak regulation boiler. The technical scheme can be widely applied to the technical field of boiler peak regulation.

A stove is provided that includes a combustion chamber, a fuel grate disposed within the combustion chamber, and a pellet adapter removably positionable on the fuel grate. The fuel grate includes a plurality of first vent holes. The pellet adapter includes a plurality of second vent holes sized and shaped to prevent the passage of fuel pellets. The pellet adapter also includes a raised outer rim and a central protrusion having a height greater than the height of the raised outer rim.

The invention relates to the technical field of flue gas purification and recovery, in particular to an ultralow emission system and method for chemical looping combustion flue gas. The system comprises a fuel reactor, a flue gas outlet of the fuel reactor is connected with an inlet of a cyclone separator, and a first nitrogen oxide removal unit and a second nitrogen oxide removal unit are sequentially arranged on an outlet flue of the cyclone separator; the outlet flue is sequentially connected with the dust removal unit, the desulfurization unit and the recycling unit, and part of flue gas treated by the dust removal unit is used for diluting a denitration reducing agent in the second nitrogen oxide removal unit and / or returns to the fuel reactor for cyclic utilization; and part of recycled flue gas treated by the recycling unit is at least used for atomization of a denitration reducing agent in the first nitrogen oxide removal unit, and / or returns to the chemical looping coal feeding system. According to the system and the method, a whole-process treatment link of denitration, dust removal, desulfurization and carbon dioxide capture and recovery of the chemical looping combustion flue gas is constructed, corresponding pollutants are accurately removed by each unit, and the flue gas is recycled.

The biomass particle hot blast stove comprises a stove body, a feeding assembly, a combustion assembly, a heat exchange assembly and a smoke exhaust assembly. The combustion assembly is arranged in the furnace body, a combustion chamber of the combustion assembly is sequentially divided into a drying pyrolysis area, a main combustion area and a burnout area in the conveying direction of biomass particles, and ordered partitioned combustion of preheating, sufficient combustion and complete burnout of fuel is achieved; the heat exchange assembly comprises a first heat exchange set arranged above the combustion assembly and a second heat exchange set arranged in the circumferential direction of the combustion assembly, and a three-dimensional and multi-layer waste heat recovery structure is formed. The combustion efficiency and the burn-off rate of the biomass particles are obviously improved; through the first heat exchange set and the second heat exchange set, efficient and sufficient recovery of combustion waste heat is achieved, and the overall heat efficiency and the energy utilization rate of the hot blast stove are greatly improved.

The energy-saving combustion stepped furnace comprises a stepped furnace body and a feeding opening formed in one side of the stepped furnace body, the feeding opening is provided with a feeding assembly, the feeding assembly comprises a feeding frame used for conveying coal, an extrusion assembly is arranged above the feeding frame, and the extrusion assembly is arranged above the feeding frame; a grating plate and turning plates are arranged in the middle and at the two ends of the output end of the feeding frame correspondingly, guide assemblies are arranged on the turning plates correspondingly, each guide assembly comprises a guide plate slidably arranged on the grating plate, a lifting assembly and a locking assembly are arranged on the guide assemblies on the two sides correspondingly, and the extrusion assembly is used for extruding bamboo scraps into balls; the guide assembly drives the guide plate to guide coal when the turning plates on the two sides are turned over, the lifting assembly is used for driving the grating plate to ascend and descend, and the locking assembly is used for locking the grating plate, so that fuel evenly flows on the steps, and the combustion effect is improved.

There is provided a flow-directing apparatus for a furnace for curing tobacco, the flow-directing apparatus comprising: one or more flow guides arranged to form a primary fluid flow path to guide a primary fluid flow from a primary combustion chamber of the furnace to a mixing region of the furnace; and one or more bypass channels arranged to form a secondary fluid flow path for receiving a secondary fluid flow from an inlet, wherein the secondary fluid flow path bypasses at least part of the primary fluid flow path, wherein an outlet of the one or more bypass channels is arranged to feed into the mixing region to cause the primary fluid flow and the secondary fluid flow to mix.

The utility model belongs to the technical field of cable combustion tests, and relates to a combustion chamber for a cable bunching combustion testing machine. The device comprises a combustion box, a smoke exhaust pipe is fixedly connected to the top of the combustion box, a supporting frame is fixedly connected to the vertical outer wall of the combustion box, a box door is fixedly connected to the side wall of the front side of the combustion box, a box door lock is fixedly connected to the combustion box, and a cable fixing frame is slidably connected into the combustion box. An ignition machine is placed on the inner wall of the bottom of the combustion box, and the bottom of the combustion box is connected with a combustion impurity collecting mechanism. According to the utility model, solid impurities can be prevented from raising, the convenience of cleaning the combustion chamber for the cable harness combustion test is effectively improved, the ignition position of the cable harness can be flexibly adjusted according to ignition requirements, and the flexibility of the cable harness combustion test is effectively improved.

The utility model discloses a system for synchronously preparing biochar with different qualities. The system comprises a starting device, a combustion chamber, a first carbonization device, a second carbonization device and an alkali metal element recovery device, combustible gas generated in biomass carbonization by the starting device, the first carbonization device and the second carbonization device is input into the combustion chamber for combustion, and energy consumption can be reduced. A first flue gas input port of the first carbonization device is hermetically connected with a first flue gas output port of the combustion chamber; a second flue gas output port of the first carbonization device is hermetically connected with a second flue gas input port of the second carbonization device; a third flue gas output port of the second carbonization device is hermetically connected with a third flue gas input port of the alkali metal element recovery device; the flue gas utilization efficiency can be improved, and energy consumption is reduced. The product output port of the second carbonization device is further connected with the second raw material input port of the alkali metal element recovery device, and the alkali metal element recovery device is added, so that waste of alkali metal elements is avoided.

Gasification processes are disclosed, which can implement one or more strategies for heating and humidifying the gasifier effluent, as needed for effective hydrogen enrichment through the water-gas shift (WGS) reaction that converts H2O. Particular aspects, in carrying out these strategies, relate to the use of an evaporator upstream of a WGS reactor and operating at a comparable pressure (e.g., at least about 10 bar, at least about 20 bar, or at least about 30 bar, such as in a range from about 30 bar to about 100 bar). Such high-pressure evaporator may provide sufficient water vapor content, for effective generation of H2 via the WGS reaction, as needed for downstream uses. Advantageously, heat and / or material (e.g., condensate) sources may be available within the process itself, and integrated to meet at least some of the operational demands of the evaporator.

The present invention relates to a method and structure for preventing the coking of biomass fuel from affecting combustion, and belongs to the technical field of biomass combustion residue removal. The technical solution is as follows: a plurality of air inlet holes (14) with variable functions are arranged in layers on the side wall of a combustion tube (3); when the combustion tube (3) is inserted into an inner container (2), it becomes a furnace; after a combustion cycle, the combustion tube (3) is pulled out to remove the coke in one go. A combustion layer (16) and a coking layer (17) are provided in the combustion tube (3); the combustion layer (16) is always on top. As the combustion progresses, the coking layer (17) gradually thickens, and the air inlet holes corresponding to the combustion layer also rise dynamically. The coking layer can neither occupy the space of the combustion layer nor block the air inlet holes corresponding to the combustion layer to affect combustion. The positive effect of the present invention is that after the present invention is applied, various biomass boilers, stoves, and burners no longer require a decoking device, can burn stably for a long time under various fire powers, can use high-ash content and cheap fuel, and reduce manufacturing and operating costs.

The utility model discloses a novel biomass combustion furnace chimney device, which relates to the technical field of combustion furnaces, and comprises a furnace body, the top of the furnace body is provided with a radiator for carrying out heat exchange on combustion flue gas, one side of the radiator is communicated with an air outlet pipe, the top of the air outlet pipe is provided with a chimney body, and the chimney body is communicated with the radiator. The chimney has the advantages that the inclined pipe is beneficial to stabilizing the airflow in the chimney, if a straight-barrel-shaped chimney is adopted, the situation that the pulling force of the chimney is not enough can be generated in the high-speed working process of a fan, the airflow in the chimney needs to be supplemented through the inclined pipe, and therefore the chimney is not prone to being damaged. Otherwise, the overall length of the chimney needs to be increased, the cost is increased, the air outlet space of the connecting pipe is blocked through movement of the baffle, and therefore the effect of adjusting the air quantity entering the chimney body is achieved, and the air speed is adjusted according to the feeding and combustion conditions in the hearth.

The disclosure relates to a self-contained mobile power generator entity (100) comprising: a biomass fuel inlet (103) configured to allow passage of biomass fuel feedstock (105) into the power generator unit; a chopper unit (107) connected to the biomass fuel inlet and configured to receive the biomass fuel feedstock and produce ignitable pieces of biomass fuel; a fuel dryer unit (109) arranged to receive the produced ignitable pieces (105a) of the biomass fuel and configured to remove excess moisture from the ignitable biomass fuel pieces in order to produce dried ignitable pieces of biomass fuel; at least one energy converter unit (113,113a,113b) configured to convert an input thermal energy, provided by a heat source and a heat sink, to an output kinetic energy; a combustion unit (111), arranged in thermal communication with the at least one energy converter unit, to provide the heat source to the at least one energy converter unit; the combustion unit being configured to receive the dried ignitable pieces of biomass fuel and configured to generate heat energy by combusting the dried ignitable pieces of biomass fuel; a heat sink unit (115), arranged in thermal communication with the at least one energy converter, to provide the heat sink to the at least one energy converter unit and dissipate heat from the at least one energy converter unit; a power generator unit (117,117a,117b) in operational communication with the at least one energy converter unit, and configured to convert the output kinetic energy received from the at least one energy converter unit to an output electrical power. The disclosure further relates to a method, a computer-implemented method for commencing and controlling an operation of a self-contained mobile power generator entity, a control system (200), a computer program product and a computer program carrier.

This application relates to a rice husk combustion and recycling drying device, comprising: a combustion furnace and a drying chamber. The combustion furnace includes a biomass buffer chamber and a combustion chamber that are interconnected. An ash chamber connected to the combustion chamber is located inside the combustion furnace. A grate is located above the ash chamber inside the combustion furnace. A heat exchange chamber connected to the combustion chamber is located above the combustion furnace. An igniter is installed on the combustion furnace to ignite the rice husks inside the combustion chamber. A heat exchanger is installed inside the heat exchange chamber. The heat exchanger has a heat exchange channel for heating air. This application, through the coordinated use of the biomass buffer chamber, combustion chamber, ash chamber, heat exchange chamber, and igniter, fully utilizes the rice husks generated during rice processing, burning them as fuel to provide heat energy for the drying process, thus avoiding resource waste caused by the indiscriminate disposal or inefficient use of rice husks.

The invention discloses a biomass and coal coupled combustion system and method.The biomass and coal coupled combustion system comprises a pyrolysis reactor used for pyrolyzing biomass raw materials to generate biomass charcoal and pyrolysis gas, the pyrolysis reactor is provided with a first feeding port and a first discharging port, and the first feeding port is used for feeding the biomass raw materials; the preheating device is arranged on the pyrolysis reactor and is used for preheating the pyrolysis reactor; the combustion furnace is provided with an air inlet, a second feeding port and a coal feeding port, the second feeding port and the air inlet are both communicated with the first discharging port, and the coal feeding port is used for feeding coal. According to the biomass and coal coupling combustion system, the raw material range of biomass and coal coupling combustion can be effectively expanded, the biomass fuel treatment cost is reduced, and the coupling combustion stability and combustion efficiency are improved.

The utility model discloses a biomass combustion gas hot air boiler, the inner side of a rotating seat is embedded and rotatably connected with a rotating rod, the top end of the rotating rod is provided with a rotating blade, and the edge end of the rotating rod is fixedly connected with four linkage rods at equal angles at the bottom of the rotating blade; the bottom ends of the four linkage rods are connected with connecting rods at equal intervals, and the bottom ends of the connecting rods are fixedly connected with material turning shovel plates. Heat airflow generated in the combustion process is used for driving the rotating blades to rotate, and the rotating rods are synchronously driven to rotate; according to the biomass particle combustion device, the linkage rod, the connecting rod and the material turning shovel plate can be conveniently driven to rotate on the inner side of the combustion hearth, the material turning shovel plate moves along the top face of the leakage net, biomass particles accumulated in the combustion hearth can be conveniently turned through rotation of the material turning shovel plate, and therefore the biomass particles can be combusted more thoroughly, and the combustion effect is guaranteed.

The present invention related to an iron fuel combustion arrangement comprising an iron fuel burner arrangement, and a suspension generation arrangement for providing a suspension comprising iron fuel, wherein said suspension generation arrangement is positioned upstream of said burner arrangement, wherein said suspension generation arrangement comprises a housing with a substantially vertical central axis for transporting a stream of iron fuel towards said burner arrangement, wherein said suspension generation arrangement further comprises an injection element extending at least partly in said housing, for injecting compressed gas into said stream of iron fuel, wherein said suspension generation arrangement further comprises a mixing portion connected to said housing downstream of said injection element wherein in use said stream of iron fuel and said injected gas are mixed to provide said suspension comprising iron fuel.

The invention relates to a device and a method for improving air permeability of a thick bed by utilizing biomass fuel. The device comprises a T-shaped frame and a cross rod, the T-shaped frames are arranged in a bilateral symmetry mode, and the horizontal ends of the T-shaped frames face downwards. The cross rod is correspondingly and fixedly connected between the upper portions of the vertical ends of the T-shaped frames on the two sides. The method comprises the following steps: S1, preparing hydrogen-rich biomass; s2, forming the biomass combustion rod; and S3, sintering application. According to the invention, biomass which is a renewable clean resource is reinforced and applied to the field of sintering production, so that carbon emission is effectively reduced, and dependence on carbon-containing fuel in the sintering process is reduced; and meanwhile, the matching device can effectively improve the material layer air permeability in the thick material layer sintering process, and the effects of increasing yield and reducing consumption are achieved.

The utility model belongs to the technical field of biomass particle furnaces, and particularly relates to a feeding device of a biomass particle furnace, which comprises a storage bin, a feeding device is arranged below the storage bin, a feeding hole is formed in a position, corresponding to an opening in the lower end of the storage bin, of the feeding device, and a discharging hole is formed in one end, far away from the feeding hole, of the feeding device. The feeding device comprises a shell, a conveying assembly is installed in the shell, a plurality of transverse baffles are evenly installed on the conveying assembly at intervals, and two side baffles are symmetrically arranged at the two ends of each transverse baffle in a sliding mode. According to the utility model, the quantity of the fuel entering the combustion chamber can be controlled according to the requirements of different combustion furnaces, the application range is wider, and meanwhile, the buffering bin is arranged, so that the energy is saved, and the cost is reduced.

The invention relates to the technical field of energy utilization, and discloses a biomass boiler which comprises a biomass boiler body, a manipulator is installed on one side of the biomass boiler body, a discharging door is installed on one side of the biomass boiler body, a feeding pipeline is fixedly connected to the top of the biomass boiler body, and a discharging pipeline is fixedly connected to the top of the biomass boiler body. The biomass boiler comprises a biomass boiler body, mounting frames are mounted on the two sides of the biomass boiler body correspondingly, mixing parts are mounted in the two mounting frames correspondingly, each mixing part comprises a sleeve, and a fluted disc is fixedly connected to the surface of each sleeve. According to the biomass boiler, fuel in the biomass boiler body is stirred through the digging hopper, the materials are driven to be evenly poured into the biomass boiler body, meanwhile, ash and solid fuel in the fuel are screened, and therefore the materials are prevented from being stacked and agglomerated, and the contact area between the fuel and air is increased; and ash is prevented from being accumulated at one position to influence the combustion quality of fuel, so that the combustion heating efficiency during operation of the biomass boiler body is improved.

The invention relates to a chimney system (1) comprising a chimney furnace (2) to which a furnace pipe (5) is connected for discharging exhaust gases (8) from the chimney furnace (2), wherein an exhaust gas aftertreatment unit (9) is provided in the furnace pipe (5), and at least two axial zones (10, 11) are mounted in the exhaust gas aftertreatment unit (9), a first zone (10) having a catalytic function and a second zone (11) having a filtering function. Each of the at least two zones (10, 11) comprises a plurality of channels (16) with a channel density of at most 600 cpsi [cells per square inch].

This invention provides a combustion system and method for a biomass bulk boiler with coupled chamber combustion and stoker combustion. The system includes a boiler with a furnace at the top and a reciprocating grate at the bottom. A distributor is installed at the feed inlet at the front of the furnace. A tail flue is connected to the flue gas outlet at the top of the furnace. An economizer and an air preheater are connected in series on the tail flue. The air preheater has a primary cold air inlet and a secondary cold air inlet. A primary air fan is connected to the primary air inlet and connects to the distributor after heat absorption by the air preheater. A secondary air fan is connected to the secondary air inlet and connects to the reciprocating grate after heat absorption by the air preheater. This invention simplifies the biomass processing by coupling fine-particle chamber combustion with coarse-particle chamber combustion and stoker combustion, improving boiler combustion efficiency, reducing furnace combustion temperature, and reducing nitrogen oxide emissions. High-temperature supplementary combustion air is provided to the distributor and reciprocating grate through secondary heat exchange utilization of the high-temperature flue gas.

The utility model discloses a fuel coupling device, relates to sludge treatment technical field, include first storage structure, second storage structure and burning structure, the first storage structure is used for holding first fuel, the first fuel is dried sludge fuel, the second storage structure is used for holding second fuel, and the burning structure is used for burning the second fuel. A discharging port of the first material storage structure and a discharging port of the second material storage structure are both connected with a feeding port of the combustion structure, and a first valve is arranged on a pipeline between the discharging port of the first material storage structure and the feeding port of the combustion structure. A second valve is arranged on a pipeline between a discharging port of the second storage structure and a feeding port of the combustion structure, and the combustion structure combusts the first fuel and the second fuel. According to the fuel coupling device, sludge fuel can be reasonably utilized, the environment is protected, and resources are saved.

The utility model discloses a biomass particle catalytic combustion smokeless furnace, and belongs to the technical field of combustion furnaces. According to the smokeless furnace, the conical smoke return opening and the oxygenation smoke return assembly are designed, smoke dust generated during particle combustion can be collected, mixed with air and then conveyed into the combustion chamber again to be subjected to secondary or multiple times of combustion, particles are fully combusted, and then smokeless emission is achieved; and the conical flow guide plate is arranged on the upper side of the conical smoke return opening, on one hand, smoke dust which is not fully combusted can be prevented from being discharged out of the furnace body, meanwhile, heat can be conducted to the heat exchange pipe, the heat exchange efficiency is improved, and the problems that a traditional combustion furnace is large in smoke amount, low in boiler heat efficiency and poor in environment friendliness are effectively solved.