CN112303903A - Step-by-step pushing grate forced circulation coal-fired hot water boiler - Google Patents

Abstract

The invention discloses a step-by-step grate pushing forced circulation coal-fired hot water boiler which comprises a base and a boiler body, wherein a grate is arranged on the base, the boiler body is arranged above the grate, a boiler barrel is arranged on the boiler body, a dust filtering component is arranged in the boiler body, and the dust filtering component is used for filtering dust in smoke. This internal heat dissipation layer that installs of boiler, the heat dissipation layer sets up on the brickwork inner wall of boiler body, absorbs the inside heat of boiler body to in supplementing the boiler once more with the absorbed heat, reduce the brickwork to thermal absorption, thereby reduce thermal loss, improve the utilization ratio to the heat.

Description

Step-by-step pushing grate forced circulation coal-fired hot water boiler

Technical Field

The invention relates to the technical field of coal-fired hot water boilers, in particular to a step-type grate pushing forced circulation coal-fired hot water boiler.

Background

A boiler is a device that heats water by heat energy released by combustion of a medium and generates steam or hot water of prescribed parameters (temperature, pressure). The coal-fired boiler is a heat energy power device which takes coal as fuel, releases heat through combustion of the coal in a hearth (combustion chamber) and heats heat medium water or other organic heat carriers to a certain temperature. The coal-fired boilers are classified into coal-fired water boilers, coal-fired hot water boilers, coal-fired steam boilers and coal-fired heat conduction oil boilers according to purposes. The coal-fired hot water boiler is usually designed according to normal pressure, and the top of a boiler body is provided with a gas port, so that the boiler operates without pressure, and the combustion operation is safe and reliable; can be installed at any required place for use and is not limited by procedures of monitoring and examining year by year with a great level, so that the rapid development is achieved in recent years.

However, the coal-fired boiler does not convert all heat effectively, and has partial reactive power consumption, and the existing coal-fired hot water boiler generally has an unreasonable internal structure, for example, a large number of flue gas pipes are installed inside the existing boiler barrel, the flue gas pipe on the outermost side with the highest heat exchange efficiency is the flue gas pipe on the middle layer, and the flue gas pipe located at the central position exchanges heat with heated water, so that the heat exchange efficiency of the flue gas pipe at the central position is low, the heat in the central flue gas pipe cannot be effectively utilized, the utilization rate of the heat is low, the usage amount of coal is increased, and the cost is increased; the arrangement is not compact, the flue gas flow is short, the heating area is small, and the like, so that the heat transfer effect of the boiler is poor, the heat carried by the flue gas is high, the thermal efficiency of the boiler is low, and the energy consumption is high.

Disclosure of Invention

The invention aims to provide a step-type grate pushing forced circulation coal-fired hot water boiler to solve the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme: step-by-step promotion grate forced circulation coal-fired hot water boiler, this coal-fired hot water boiler include base, boiler body, be provided with the grate on the base, boiler body sets up in the grate top, is provided with the drum on the boiler body, and the inside dust filtering component that is provided with of boiler body, dust filtering component filters the dust in the flue gas. This internal heat dissipation layer that installs of boiler, the heat dissipation layer sets up on the brickwork inner wall of boiler body, absorbs the inside heat of boiler body to in supplementing the boiler once more with the absorbed heat, reduce the brickwork to thermal absorption, thereby reduce thermal loss, improve the utilization ratio to the heat.

As a preferred technical scheme, one end of the fire grate is positioned outside the boiler body, and other parts of the fire grate are positioned inside the boiler body; a coal hopper is arranged on the outer side of the boiler body above the fire grate, and a guide plate is arranged at one end inside the boiler body; the dust filtering assembly comprises a partition wall, the partition wall is arranged at the other end of the boiler body, and a transverse wall is arranged on one side, close to the partition wall, of the guide plate. The coal scuttle is stored the coal, the grate promotes the grate for marching type, coal to in the coal scuttle is transmitted, and for it provides the support in the burning of boiler body, the inside confined combustion space that forms of boiler body, and keep warm and completely cut off the heat that produces when burning, prevent that the heat from diffusing to in the external atmosphere, and prevent that inside hot-air from carrying out the heat exchange with the external world, the guide plate carries out the water conservancy diversion to the high temperature flue gas that the inside burning of boiler body formed, make the flue gas flow according to certain flow direction, the partition wall separates boiler body inner space, make the inside combustion chamber and the burn-off room that forms of boiler body, the cross wall mutually supports with the guide plate, the high temperature that produces when preventing the coal burning directly heats the boiler section of thick bamboo, and dredge the flue gas, make the flue gas enter into the burn-off.

As preferred technical scheme, the dirt subassembly includes supporting wall, supporting wall is fixed with the inside terminal surface of boiler body, supporting wall is fixed with partition wall one end, the up end that the partition wall is close to guide plate one side is provided with the backward flow board, the one end that the horizontal wall is located supporting wall top is provided with the dust removal wall body, the dust removal wall body lower extreme is close to a side terminal surface of partition wall and is provided with the fillet, is provided with the separation wall body on the dust removal wall body other side terminal surface, the other end of separation wall body is sled form. The partition wall is obliquely arranged in the boiler body and guides the flow of the smoke generated in the combustion chamber, the backflow plate blocks a smoke inlet of the burnout chamber to prevent the smoke in the burnout chamber from flowing back into the combustion chamber after expanding, the support wall plays a role in mounting and supporting the partition wall, the transverse wall, the backflow plate, the support wall and the dedusting wall are mutually matched to form the burnout chamber, the smoke with dust is combusted again in the burnout chamber to ensure that the temperature of the smoke rises again and the dust obtains kinetic energy of high-speed motion and collides in the burnout chamber, the dust is mutually attracted together in the collision to form large dust particles, the dedusting wall blocks the smoke after combustion and expansion to ensure that the smoke flows according to a certain flow direction, the separation wall prolongs the flow channel of the smoke, and the front smoke rapidly flows in the flow channel under the pushing of the back smoke, and the kinetic energy of the dust is increased in the flowing process, so that the dust is separated from the high-temperature flue gas after flowing out of the burnout chamber, the dust removing wall body is not contacted with the inner wall of the boiler body and is matched with the inner wall of the boiler body to form a channel I for vertical flow of the flue gas, the upper end surface of the transverse wall is not contacted with the lower end of the boiler barrel, and the transverse wall is matched with the boiler barrel to form a channel II for transverse flow of the flue gas.

As preferred technical scheme, the support wall body up end is provided with the separating tank, and the support wall body lower extreme is located the separating tank below and is provided with the dust removal passageway, the dust removal passageway is the loudspeaker form, the inside zone of heating that is provided with of support wall body, the separating tank is located the outside of partition wall. The separating tank is located separating wall's below, and be located the right side of partition wall, when accelerated motion's dust granule moves towards the right side below, the dust granule is because during inertia removes separating tank, and the flue gas is light gas, upward move, thereby make dust and flue gas separation, the zone of heating comprises the sand, the inside zone of heating that also is provided with of partition wall, in the partition wall transmits absorptive heat to the knee wall, the inside sand of knee wall heats the separating tank, the zone of heating in the knee wall is around the outside of separating tank and heats the lower extreme of separating tank, make the inside lower extreme of separating tank the air of expansion of being heated, and flow the below of knee wall through dust removal channel under the extrusion of upper end flue gas.

According to the preferable technical scheme, the cross section of the guide plate is triangular, the filter layer is arranged inside the guide plate, the front flue gas cabin is arranged above the guide plate, and the front flue gas cabin is connected with the boiler barrel pipeline. The inside cavity that is of guide plate, the inside filter layer of guide plate comprises the sand, the guide plate contacts with the combustion chamber, and the high temperature that produces through the combustion chamber heats the sand, it is fast to absorb the heat through the sand, the fast characteristic of heat dissipation, absorb the temperature on the guide plate, and heat the air in the flue gas cabin before water conservancy diversion inside air and top, make the guide plate inside with preceding flue gas cabin be the hyperbaric space, passageway II and guide plate inner space intercommunication, inside the flue gas that flows in the passageway II enters into the guide plate, the flue gas that has trace dust enters into inside the guide plate, trace dust is filtered by the sand in the flue gas, high temperature flue gas then enters into preceding flue gas cabin, further make the pressure reinforcing in the preceding flue gas cabin.

As preferred technical scheme, the drum is inside to be provided with a plurality of groups flue gas pipe, a plurality of groups the flue gas pipe inner wall is corrugate, a plurality of groups flue gas pipe one end and preceding flue gas cabin intercommunication, and a plurality of groups flue gas pipe other end intercommunication have back flue gas cabin, and a plurality of groups flue gas pipe lower extreme pipe wall inside level is provided with the flowing back passageway, flowing back passageway and the inside intercommunication of flue gas pipe, flowing back passageway and back flue gas cabin intercommunication. The flue gas pipe and preceding flue gas cabin intercommunication make the high temperature high pressure flue gas in the preceding flue gas cabin enter into the flue gas pipe, provide the passageway for the flow of high temperature high pressure flue gas in the boiler barrel, the high temperature flue gas flows in the flue gas pipe and carries out cold and hot exchange with the water in the boiler barrel, and the laminar flow of flue gas is destroyed to the pipe wall of corrugate, makes the unordered flow of flue gas in the flue gas pipe, improves the cold and hot exchange efficiency between flue gas and the water, improves heat utilization. The flue gas and water carry out cold and heat exchange, and the solution that produces after the condensation flows into in the flowing back passageway to the extrusion of high pressure flue gas flows out the flue gas pipe in the flue gas pipe, prevents that solution from corroding the flue gas pipe and causing the damage.

As preferred technical scheme, the drum is inside to be the annular and from inside to outside to be provided with two-layer at least flue gas pipe, is located central point and puts the pipe diameter of flue gas pipe is outer a plurality of groups 3 times of flue gas pipe diameter, a plurality of groups the inside that flue gas pipe is close to back flue gas cabin one end all is provided with the pressure boost board, the gas outlet has been seted up to pressure boost board central point, is located central point and puts outer a plurality of groups of flue gas pipe and central point are put the flue gas pipe coupling, are located outer a plurality of groups the outside and the outer a plurality of groups of self of flue gas pipe the flue gas union coupling. Taking three layers of flue gas pipes as an example, the flue gas pipe at the central position is connected with the flue gas pipe at the middle layer, the pipe diameter of the flue gas pipe at the central position is 3 times of the pipe diameters of all the flue gas pipes at the outer layer, so that the flue gas content and the heat in the central flue gas pipe are increased, the flue gas pipe participates in the cold and heat exchange process with water through the rise of the heat, meanwhile, the flue gas pipe at the outermost layer and the flue gas pipe at the middle layer are arranged in a staggered mode, so that the flue gas pipes at the outermost layer and the middle layer can well exchange heat with water, when the flue gas heat in the flue gas pipe at the outermost layer and the flue gas pipe at the middle layer is reduced, the air pressure in the flue gas pipe at the inner part is correspondingly reduced, at the moment, the flue gas in the flue gas pipe at the central position flows to the middle layer and the outermost, the pressurizing plate blocks the flow of the flue gas in the flue gas pipe, so that the high-temperature flue gas is accumulated in the flue gas pipe, the temperature in the flue gas pipe is further increased, and the cold-heat exchange efficiency is improved.

As a preferred technical scheme, one side of the base is provided with an air blower, the air blower is connected with a boiler pipe, the boiler barrel is provided with a water inlet pipe and a water outlet pipe, the water inlet pipe is connected with a water pump pipeline, and the rear flue gas cabin is connected with an economizer pipeline.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the heat dissipation layer is arranged in the boiler body and is arranged on the inner wall of the boiler body, so that heat in the boiler body is absorbed and is replenished into the boiler again, and the absorption of the boiler wall on the heat is reduced, thereby reducing the loss of the heat and improving the utilization rate of the heat.

2. In the invention, the partition wall, the transverse wall, the reflux plate, the supporting wall and the dedusting wall are mutually matched to form a burnout chamber, smoke with dust is combusted in the burnout chamber again to ensure that the temperature of the smoke rises again and the dust obtains kinetic energy of high-speed movement and collides in the burnout chamber, the dust is mutually attracted together in collision to form large dust particles, the dedusting wall blocks the smoke after combustion and expansion and ensures that the smoke flows according to a certain flow direction, the separation wall prolongs the flow channel of the smoke, the front smoke is driven by the back smoke to rapidly flow in the flow channel, and the kinetic energy of the dust is increased in the flowing process, so that the dust is separated from the high-temperature smoke after flowing out of the burnout chamber, the dust in the smoke is prevented from being attached to the inner wall of the smoke pipe when the smoke is cooled, and the heat exchange between the smoke pipe and water by the dust is further reduced, the heat exchange efficiency between the flue gas pipe and water is improved.

3. In the invention, the flue gas in the flue gas pipe at the central position flows to the middle layer and the outermost layer through the pipeline to provide heat for the flue gas pipes at the outermost layer and the middle layer, so that the condensation of the flue gas in the flue gas pipes at the outermost layer and the middle layer is reduced, the flow of the flue gas in the flue gas pipes is blocked by the pressurizing plate, the high-temperature flue gas is accumulated in the flue gas pipes, the temperature in the flue gas pipes is further increased, and the cold-heat exchange efficiency is increased.

4. In the invention, high-temperature flue gas flows in the flue gas pipe and carries out heat exchange with water in the boiler barrel, and the corrugated pipe wall destroys laminar flow of the flue gas, so that the flue gas flows in the flue gas pipe disorderly, the heat exchange efficiency between the flue gas and the water is improved, and the heat utilization rate is improved; the flue gas and water carry out cold and heat exchange, and the solution that produces after the condensation flows into in the flowing back passageway to the extrusion of high pressure flue gas flows out the flue gas pipe in the flue gas pipe, prevents that solution from corroding the flue gas pipe and causing the damage.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic illustration of the installation of the overall structure of the present invention;

FIG. 2 is a schematic view in half section of the overall structure of the present invention;

FIG. 3 is a front view, semi-sectional, schematic view of a flue gas duct of the present invention;

FIG. 4 is a schematic view of a simulation of the connection of flue gas pipes in the drum of the present invention;

fig. 5 is a right side view of the flue pipe of the present invention.

In the figure: 1. a base; 2. a grate; 3. a boiler body; 4. a drum; 3-1, a deflector; 3-2, partition walls; 3-3, a transverse wall; 3-4, a reflux plate; 3-5, removing dust from the wall; 3-6, separating the wall; 3-7, a separation tank; 4-1, a flue gas pipe; 4-2, a pressurizing plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides the following technical solutions: step-by-step promotion grate forced circulation coal-fired hot water boiler, this coal-fired hot water boiler includes base 1, boiler body 3, grate 2 is installed to base 1 top, the air-blower is installed to base 1 right side, the air-blower is bloied grate 2, provide the basis for the burning of grate 2 coaling, boiler body 3 is installed in grate 2 top, and simultaneously, boiler body 3 upper end fixed mounting has a boiler section of thick bamboo 4, install the inlet tube on the boiler section of thick bamboo 4, the outlet pipe, pressure valve etc., the inlet tube is connected with water pump (not drawn in the picture) pipeline, water pump extraction after purifying pours into in the boiler section of thick bamboo 4, make water in the boiler section of thick bamboo 4 by forced circulation, 3 internally mounted of boiler body has the dirt subassembly, the dirt subassembly filters the dust in the flue gas.

The left end of the grate 2 is positioned outside the boiler body 3, the other parts of the grate 2 are positioned inside the boiler body 3, the left side of the boiler body 3 is positioned above the grate 2 and provided with a coal hopper, the coal hopper adds coal to the grate 2, and the grate 2 pushes the grate in a stepping mode.

The left side end face of the inside of the boiler body 3 is fixedly provided with a guide plate 3-1, the cross section of the guide plate 3-1 is triangular, the inside of the guide plate 3-1 is of a hollow structure, sand is stored in the guide plate 3-1 and is combined into a filter layer, the inner end face of the boiler body 3, the guide plate 3-1 and the boiler barrel 4 are matched with each other to form a front flue gas cabin above the guide plate 3-1, the front flue gas cabin is communicated with a pipeline inside the boiler barrel 4, the right side of the boiler body 3 is fixedly provided with a flue gas cylinder, the right end of the flue gas cylinder is connected with an economizer, and the flue gas cylinder forms a rear flue gas cabin outside the boiler.

The dust filtering assembly comprises a supporting wall body and a partition wall 3-2, the right end of the supporting wall body is fixed with the right end face of the interior of the boiler body 3, the upper end face of the left side of the supporting wall body is fixed with the right end of the partition wall 3-2, the partition wall 3-2 is obliquely installed on the supporting wall body, and a backflow plate 3-4 is obliquely fixed on the upper end face of one side, close to the flow guide plate 3-1, of the partition wall 3-2.

The guide plate 3-1 is horizontally and fixedly provided with a transverse wall 3-3 on the end face of the right side close to the partition wall 3-2, the upper end face of the transverse wall 3-3 is not contacted with the boiler barrel 4, the right end is not contacted with the end face of the right side of the boiler body 3, the right end of the transverse wall 3-3 above the supporting wall is vertically and fixedly provided with a dedusting wall body 3-5, the end face of one side of the lower end of the dedusting wall body 3-5 close to the partition wall 3-2 is processed with a round angle, the end face of the right side of the dedusting wall body 3-5 is obliquely and fixedly provided with a separating wall body 3-6 downwards, the separating wall body 3-6 is parallel to the partition wall 3-2, and the.

The supporting wall body, the partition wall 3-2 and the transverse wall 3-3 divide the interior of the boiler body 3 into a combustion chamber and a burnout chamber, and the reflux plate 3-4 and the transverse wall 3-3 are matched with each other to form a through hole between the combustion chamber and the burnout chamber, namely a smoke inlet of the burnout chamber.

The right end of the backflow plate 3-4 is inclined upwards, a smoke inlet with gradually reduced flow space is formed between the backflow plate 3-4 and the transverse wall 3-3, and the smoke generated by the combustion chamber is enhanced in pressure at the smoke inlet through the arrangement of the smoke inlet, so that the smoke pressure at the smoke inlet is greater than the pressure in the burnout chamber, and the smoke in the burnout chamber is prevented from entering the combustion chamber.

Heating layers made of sand are arranged in the supporting wall body and the partition wall 3-2, the upper end face of the supporting wall body is positioned on the right side of the partition wall 3-2 and is provided with a separation groove 3-7, the lower end of the supporting wall body is positioned below the separation groove 3-7 and is provided with a dust removal channel, the dust removal channel is horn-shaped, and the heating layers in the supporting wall body heat the lower half part of the separation groove 3-7.

A plurality of groups of flue gas pipes 4-1 are arranged in the boiler barrel 4, water cooling pipes are arranged on two sides of the lower end of the boiler barrel 4, and the water cooling pipes are fixed with the inner wall of the boiler body 3.

The inner walls of the groups of flue gas pipes 4-1 are corrugated, one ends of the groups of flue gas pipes 4-1 are communicated with the front flue gas cabin, the other ends of the groups of flue gas pipes 4-1 are communicated with the rear flue gas cabin, a liquid drainage channel is horizontally arranged in the pipe wall of the lower end of each group of flue gas pipes 4-1 and is communicated with the inside of each flue gas pipe 4-1, the liquid drainage channel is communicated with the rear flue gas cabin, a blow-off pipe is arranged in each flue gas cylinder, and the blow-off pipe is connected with the liquid drainage channels in the groups of flue gas pipes 4-1.

The boiler barrel 4 is internally annular and is provided with at least two layers of flue gas pipes 4-1 from inside to outside, in the embodiment, the three layers of flue gas pipes 4-1 are taken as an example, the pipe diameter of the flue gas pipe 4-1 positioned at the central position is 3 times of the pipe diameter of a plurality of groups of flue gas pipes 4-1 positioned at the outer layer, the insides of the ends, close to the rear flue gas cabin, of the plurality of groups of flue gas pipes 4-1 are fixedly provided with pressurizing plates 4-2, and the central position of the pressurizing plates 4-2 is provided with an air outlet.

The plurality of groups of flue gas pipes 4-1 positioned in the middle layer are in pipe connection with the flue gas pipe 4-1 positioned in the center, the outer sides of the plurality of groups of flue gas pipes 4-1 positioned in the middle layer are connected with the plurality of groups of flue gas pipes 4-1 positioned on the outermost layer, and the two flue gas pipes 4-1 positioned in the middle layer are communicated with one flue gas pipe 4-1 positioned on the outermost layer.

The working principle of the invention is as follows:

when water in the boiler barrel 4 is heated, the fire grate 2 rotates and conveys coal falling from the coal hopper, the coal is driven by the fire grate 2 to burn in the combustion chamber and generate high-temperature flue gas, dust generated after the coal is burnt is discharged by the fire grate 2 in the rotating process, and the flue gas carries the coal dust to enter the burnout chamber.

The guide plate 3-1 and the partition wall 3-2 in the boiler body 3 dredge the flue gas generated by the combustion chamber, so that the flue gas carrying coal dust enters the burnout chamber, and fine-particle coal dust which is not ready to burn or just burned is completely burned in the burnout chamber, thereby further heating the flue gas.

When the guide plate 3-1 conducts smoke in the combustion chamber, the temperature in the combustion chamber is absorbed and transmitted to the filter layer, the partition wall 3-2 separates the combustion chamber from the burnout chamber, and the partition wall 3-2 absorbs high temperature in the combustion chamber and the burnout chamber and heats the heating layer, so that the heating layer in the support wall is heated, and the heating layer in the support wall heats the lower half part of the separation tank 3-7.

The coal dust further burning in the burnout chamber makes the further rising of temperature in the burnout chamber for the dust in the burnout chamber obtains more moving speed, thereby makes the dust collide each other in the burnout chamber, through the collision of mutually supporting between the dust, makes adsorb each other and form big dust particle between the dust, and then conveniently filters the dust.

The flue gas entering the burnout chamber and being burnt out enters the channel I through the dedusting wall 3-5, the pressure on the left side of the dedusting wall 3-5 is increased due to the change of the circulation channel when the flue gas passes through the dedusting wall 3-5, the flue gas flow velocity below the dedusting wall 3-5 and the separation wall 3-6 is increased, and then high-temperature dust particles obtain larger kinetic energy, when the dust particles pass through the separation wall 3-6, the dust particles move to the right and below along the inclined direction of the partition wall 3-2, and the flue gas rises to enter the channel I, so that the separation of the flue gas and the dust particles is realized.

The dust particles fall into the separating tanks 3-7, the heating layer further heats the air in the separating tanks 3-7, so that the air in the separating tanks 3-7 is heated and expanded, the upper parts of the separating tanks 3-7 are extruded by the flue gas, and the dust particles are driven by the expanded air to move towards the lower part of the supporting wall, so that the dust particles are separated from the flue gas.

The flue gas enters the guide plate 3-1 along the channel I and the channel II, enters the front flue gas cabin through the filtration of the filter layer and enters the flue gas pipe 4-1 through the front flue gas cabin, so that the flue gas heats water in the boiler barrel 4 through the flue gas pipe 4-1, the inner wall of the flue gas pipe 4-1 is corrugated, the flue gas flows disorderly in the flue gas pipe 4-1, and the flue gas is fully subjected to heat exchange with the water in the boiler barrel 4 through the flue gas pipe.

Along with the continuous entering of the flue gas and the blocking of the flue gas by the pressure increasing plate 4-2, the pressure in the flue gas pipe 4-1 is enhanced, after the flue gas in the flue gas pipe 4-1 is cooled and condensed, condensed water is generated in the flue gas pipe 4-1 and passes through the heat part of the flue gas pipe 4-1 at the central position again, the pressure in the outer layer flue gas pipe 4-1 is increased again, and therefore the condensed water generated by the flue gas pipe 4-1 is extruded out of the flue gas pipe 4-1 through the liquid drainage channel by high pressure.

The flue gas enters the rear flue gas cabin after cold and heat exchange, and enters the economizer under the suction of a draught fan connected with the economizer.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. Coal-fired hot water boiler of marching type promotion grate forced circulation, this coal-fired hot water boiler include base (1), boiler body (3), its characterized in that: the boiler is characterized in that a grate (2) is arranged on the base (1), the boiler body (3) is arranged above the grate (2), a boiler barrel (4) is arranged on the boiler body (3), a dust filtering component is arranged inside the boiler body (3), and the dust filtering component filters dust in smoke.

2. The step-by-step grate forced circulation coal-fired hot water boiler according to claim 1, characterized in that: one end of the grate (2) is positioned outside the boiler body (3), and the other part of the grate (2) is positioned inside the boiler body (3); a coal hopper is arranged on the outer side of the boiler body (3) and above the fire grate (2), and a guide plate (3-1) is arranged at one end in the boiler body; the dust filtering assembly comprises a partition wall (3-2), the partition wall (3-2) is arranged at the other end of the boiler body (3), and a transverse wall (3-3) is arranged on one side, close to the partition wall (3-2), of the guide plate (3-1).

3. The step-by-step grate forced circulation coal-fired hot water boiler according to claim 2, characterized in that: the dust filtering assembly comprises a supporting wall body, the supporting wall body is fixed with the inner end face of the boiler body (3), the supporting wall body is fixed with one end of a partition wall (3-2), a backflow plate (3-4) is arranged on the upper end face of one side, close to the guide plate (3-1), of the partition wall (3-2), a dust removing wall body (3-5) is arranged at one end, located above the supporting wall body, of the transverse wall (3-3), a round angle is arranged on the end face, close to the partition wall (3-2), of the lower end of the dust removing wall body (3-5), a separating wall body (3-6) is arranged on the end face of the other side of the dust removing wall body (3-5), and the other end of the separating wall body (3-6).

4. The step-by-step grate forced circulation coal-fired hot water boiler according to claim 3, characterized in that: the supporting wall body is characterized in that a separating groove (3-7) is formed in the upper end face of the supporting wall body, a dust removal channel is arranged below the separating groove (3-7) and located at the lower end of the supporting wall body, the dust removal channel is horn-shaped, a heating layer is arranged inside the supporting wall body, and the separating groove (3-7) is located on the outer side of the partition wall (3-2).

5. The step-by-step grate forced circulation coal-fired hot water boiler according to claim 4, characterized in that: the cross section of the guide plate (3-1) is triangular, a filter layer is arranged inside the guide plate (3-1), a front flue gas cabin is arranged above the guide plate (3-1), and the front flue gas cabin is connected with the boiler barrel (4) through a pipeline.

6. The step-by-step grate forced circulation coal-fired hot water boiler according to claim 5, characterized in that: the boiler barrel is characterized in that a plurality of groups of flue gas pipes (4-1) are arranged in the boiler barrel (4), the inner walls of the flue gas pipes (4-1) are corrugated, one ends of the flue gas pipes (4-1) are communicated with the front flue gas cabin, the other ends of the flue gas pipes (4-1) are communicated with the rear flue gas cabin, a liquid drainage channel is horizontally arranged in the pipe wall of the lower end of each of the flue gas pipes (4-1), and the liquid drainage channel is communicated with the rear flue gas cabin and communicated with the flue gas cabin.

7. The step-by-step grate forced circulation coal-fired hot water boiler according to claim 6, characterized in that: drum (4) inside is the annular and is provided with two-layer at least flue gas pipe (4-1) from inside to outside, is located central point and puts the pipe diameter of flue gas pipe (4-1) is outer a plurality of groups 3 times of flue gas pipe (4-1) pipe diameter, a plurality of groups flue gas pipe (4-1) are close to the inside of back flue gas cabin one end and all are provided with pressure boost plate (4-2), pressure boost plate (4-2) central point puts and has seted up the gas outlet, is located central point and puts outer a plurality of groups flue gas pipe (4-1) outer flue gas pipe (4-1) pipe connection of flue gas pipe (4-1) and central point position, is located a plurality of groups on outer layer the outside of flue gas pipe (4-1) and outer a plurality of groups of self flue gas pipe (4-1) are connected.

8. The step-by-step grate forced circulation coal-fired hot water boiler according to claim 7, characterized in that: an air blower is arranged on one side of the base (1) and is connected with the fire grate (2) through a pipeline, a water inlet pipe and a water outlet pipe are arranged on the boiler barrel (4), the water inlet pipe is connected with a water pump pipeline, and the rear flue gas cabin is connected with an economizer pipeline.

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