CN211667806U

CN211667806U - Split type double-combustion-chamber chain grate biomass boiler

Info

Publication number: CN211667806U
Application number: CN202020150701.4U
Authority: CN
Inventors: 李鲁信; 邢延磊
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-03
Filing date: 2020-02-03
Publication date: 2020-10-13
Anticipated expiration: 2030-02-03

Abstract

A split type biomass boiler with double combustion chambers and chain grates comprises a boiler body, wherein a combustion chamber is arranged in the boiler body, the chain grates are arranged below the combustion chamber in the boiler body, the rear wall in the combustion chamber is fixedly connected with a fire-resistant separation wall, a horizontal connecting line between the uppermost end of the fire-resistant separation wall and the front furnace wall of the combustion chamber forms a boundary of the main combustion chamber and the auxiliary combustion chamber, the rear half part in the length direction of the fire grate is positioned below the main combustion chamber, the front part of the front furnace wall of the main combustion chamber is provided with a material limiting combustion-supporting chamber, a sliding seam is arranged between the inner end of the top of the material limiting combustion-supporting chamber and the front furnace wall of the main combustion chamber, a limit plate valve is arranged in the sliding seam in an up-and-down sliding manner, a primary air port is arranged on the side wall of the furnace body below the chain grate, a secondary air hole is arranged on the front furnace wall of the main combustion chamber, the upper part in front of the side wall of the auxiliary combustion chamber is provided with a tertiary air pipe, and a multi-return-stroke tube plate type heat exchanger is arranged in the furnace body behind the auxiliary combustion chamber. The utility model discloses a longe-lived.

Description

Split type double-combustion-chamber chain grate biomass boiler

Technical Field

The utility model relates to a boiler, in particular to traveling grate stoker biomass boiler belongs to heat transfer boiler technical field.

Background

The biomass is made into a novel clean fuel which is formed (such as block, particle and the like) in various forms and can be directly combusted by taking agriculture, forestry and forestry wastes as raw materials through the processes of crushing, mixing, extruding, drying and the like. China is a big agricultural country, in the agricultural production process, after crops such as wheat, corn, rice and the like are harvested, the number of residual inedible straws is very large, the source of biomass fuel is reliable, the application of the current biomass fuel boiler has been greatly developed, in the use of the biomass boiler, a large amount of slagging soot is generated, so the discharge of the slagging soot is a design difficulty, the chain grate biomass boiler can better solve the problem, the applicant also discloses a chain grate type biomass boiler in Chinese patent application No. 2018207539276, the grate carries out annular movement under the driving of a driving motor to drive the biomass fuel on the grate to run from front to back, the soot and ash slag formed after the combustion can fall down at a rear end turning position and are output through an ash discharging auger, the abrasion is small in the running process, the biomass boiler is not easy to block, has high operation efficiency, effectively solves the problem of discharging the soot, but finds that the boiler has the following improvement points in practical application, mainly shows that the grate in the biomass boiler with the chain grate is positioned in the water-cooled wall of the boiler body, the grate at the upper part is completely exposed below the combustion chamber during combustion, and the existing boiler only has one combustion chamber, so that the temperature in the combustion chamber during operation is very high, which causes the temperature at the part of the chain grate to be very high, thus causing the service life of the chain grate to be shorter; but also can often block and die, influence the normal operating of boiler, the burning design of this scheme is still higher in finding the nitrogen oxide index of burning emission in using, and the burning is not enough, and current biomass boiler is when taking place to have a power failure suddenly in addition, and the flue gas is detained easily and can't be got rid of in the chimney, probably leads to the detonation accident.

Disclosure of Invention

The utility model discloses an overcome the above-mentioned problem that exists among the present traveling grate stoker biomass boiler, provide a split type double combustion chamber traveling grate stoker biomass boiler.

In order to realize the purpose of the utility model, the following technical proposal is adopted: a split type biomass boiler with double combustion chambers and chain grates comprises a boiler body, wherein a combustion chamber is arranged in the boiler body, the chain grates are arranged below the combustion chamber in the boiler body, a fireproof isolation wall is fixedly connected to the inner rear wall of the combustion chamber and faces upwards from back to front, a flue gas inlet is formed between the upper end of the fireproof isolation wall and the top of the combustion chamber, a horizontal connecting line between the uppermost end of the fireproof isolation wall and the front wall of the combustion chamber forms a boundary of a main combustion chamber and an auxiliary combustion chamber, the rear half part in the length direction of the grate is positioned below the main combustion chamber, a fuel inlet is formed between the lower end of the front wall of the main combustion chamber and the chain grates, a material limiting combustion chamber is arranged in the front part of the front wall of the main combustion chamber, the discharge end of a feeding auger is connected to the material limiting combustion chamber, a material level gauge and an igniter are arranged on the material limiting combustion chamber, a sliding seam is formed between the inner end of, the multi-return tube-plate heat exchanger comprises a smoke tube with multiple return strokes, water is filled outside the smoke tube, smoke enters the smoke tube of the multi-return tube-plate heat exchanger from the auxiliary combustion chamber, and a draught fan is connected to the smoke outlet of the multi-return tube-plate heat exchanger.

Further, the method comprises the following steps of; the furnace body is split, the furnace body comprises a base at the lower part and a boiler shell at the upper part of the base, the chain grate is positioned in the base, the combustion chamber is positioned in the boiler shell, and the base is fixedly connected with the boiler shell through a flange.

Further, the method comprises the following steps of; the wall of the pot shell is of a jacket structure, and the jacket structure is filled with water communicated with water outside the flue pipe.

Further, the method comprises the following steps of; fire-resistant partition include the flame retardant coating and support the heat transfer water pipe under the flame retardant coating, the heat transfer water pipe comprises many back end heat transfer water pipes and many anterior segment heat transfer water pipes, the rear end intercommunication jacket structure of many back end heat transfer water pipes, be connected with middle horizontal heat transfer water pipe between many back end heat transfer water pipes and the many anterior segment heat transfer water pipes, many anterior segment heat transfer water pipe upper ends are connected with the horizontal heat transfer water pipe in upper end, the both ends of middle horizontal heat transfer water pipe and the horizontal heat transfer water pipe in upper end all communicate jacket structure, the ascending angle of elevation of back end heat transfer water pipe and anterior segment heat transfer water pipe is different.

Further, the method comprises the following steps of; the multi-return-stroke tube-plate heat exchanger comprises a rear lower smoke box, the rear lower smoke box is communicated with a rear upper smoke outlet of the auxiliary combustion chamber, the rear lower smoke box is communicated with a front lower smoke box through a first return-stroke smoke tube, the front lower smoke box is communicated with a rear upper smoke box through a second return-stroke smoke tube, the rear upper smoke box is communicated with a front upper smoke box through a third return-stroke smoke tube, and the front upper smoke box is connected with a smoke tube of the next return stroke or connected to a smoke exhaust port.

Further, the method comprises the following steps of; each smoke tube be the slope form, the flue gas outlet end is high, the flue gas inlet end is low.

The utility model discloses an actively beneficial technological effect does: the combustion chamber is cut apart into main combustion chamber and accessory combustion chamber, combustion-supporting wind adopts the wind once, the overgrate air, the tertiary air, adopt the draught fan to draw air at the boiler end, two combustion chambers have realized the mesh ground of segmentation gaseous phase burning, the relative nitrogen oxide of this kind of combustion mode discharges the index and can be more end, and make chain grate and the high temperature position in the combustion chamber produce the certain distance, the life-span that the operation of having avoided the chain grate to lead to under the high temperature is short, the tobacco pipe adopts the slope to set up, because the flue gas is high temperature flue gas, it has self power that upwards flows, in case when having a power failure, the flue gas can not be detained in the tobacco pipe, the problem and the risk of deflagration.

Drawings

Fig. 1 is a side internal schematic view of the present invention.

Fig. 2 is a front internal schematic view of the present invention.

Fig. 3 is a partially numbered schematic view of fig. 1.

Detailed Description

In order to explain the utility model more fully, the utility model provides an implementation example. These examples are merely illustrative of the present invention and do not limit the scope of the present invention.

For further detailed explanation of the present invention with reference to the drawings, it should be noted that fig. 3 is the same as fig. 1, and fig. 3 is attached to the drawings because fig. 1 has a plurality of marks and is not easy to observe visually.

The various references in the drawings are: 1: a pot shell; 2: a base; 3: a main combustion chamber; 4: a secondary combustion chamber; 5: a fire-resistant partition wall; 6: a flue gas inlet; 7: a forehearth wall of the primary combustion chamber; 8: a fuel inlet; 9: a traveling grate; 10: a primary air inlet; 11, a material limiting combustion-supporting chamber, 12: a rotation-resisting type level indicator; 13: an igniter; 14: secondary air holes; 15: feeding the auger; 16: a storage bin; 17: a slag removal port; 18: a rear section heat exchange water pipe; 19: a front section heat exchange water pipe; 20: a middle transverse heat exchange water pipe; 21: the upper end of the horizontal heat exchange water pipe; 22: a refractory layer; 23: a jacket structure; 24: a flange; 25: cleaning the ash hole; 26: a water inlet; 27: an observation window; 28: then, the cigarette box is put down; 29: then the cigarette box is put on; 30: a dust removal door; 31: the first return strictly closes; 32: a water outlet; 33: a second return smoke pipe; 34: emptying the air; 35: a third return smoke pipe; 36: a front lower smoke box; 37: a water replenishing port; 38: the front upper smoke box; 39: a smoke outlet; 40: a tertiary air pipe; 41: tertiary air holes; 42: a limiting plate valve; 43: the horizontal connecting line between the uppermost end of the fire-resistant partition wall and the front furnace wall of the combustion chamber.

As shown in the attached drawings, the split double-combustion-chamber chain grate biomass boiler comprises a boiler body, wherein the boiler body is split, the boiler body comprises a base 2 at the lower part and a boiler shell 1 at the upper part of the base, a water inlet 26, a water outlet 32, a water replenishing port 37 and an exhaust port 34 are arranged on the boiler shell 1, the wall of the boiler shell is of a jacket structure, water communicated with water outside a flue pipe is filled in the jacket structure, 23 is of a jacket structure, namely a water jacket wall commonly adopted on the boiler, a combustion chamber is positioned in the boiler shell, the base is fixedly connected with the boiler shell through a flange, an internal combustion 24 is a flange, a combustion chamber is arranged in the boiler body, a chain grate 9 is arranged below the combustion chamber of the boiler body, the chain grate is positioned in the base, a slag cleaning port 17 is arranged on the side surface of the base at the rear part of the chain grate, an ash cleaning port 25 is arranged at the, the fire-resistant separation wall from back to preceding upwards face upward, fire-resistant separation wall include flame retardant coating 22 and support the heat transfer water pipe under the flame retardant coating, the heat transfer water pipe comprises many back end heat transfer water pipes 18 and many anterior segment heat transfer water pipes 19, the rear end intercommunication jacket structure of many back end heat transfer water pipes, be connected with middle horizontal heat transfer water pipe 20 between many back end heat transfer water pipes and the many anterior segment heat transfer water pipes, many anterior segment heat transfer water pipe upper ends are connected with the horizontal heat transfer water pipe 21 in upper end, the both ends of middle horizontal heat transfer water pipe and the horizontal heat transfer water pipe in upper end all communicate jacket structure, the ascending angle of elevation of back end heat transfer water pipe and anterior segment heat transfer water pipe is different.

A smoke inlet 6 is arranged between the upper end of the fire-resistant separation wall and the top of the combustion chamber, the combustion chamber is divided into a main combustion chamber 3 and an auxiliary combustion chamber 4 by the fire-resistant separation wall, a horizontal connecting line between the uppermost end of the fire-resistant separation wall and the front furnace wall of the combustion chamber forms a boundary of the main combustion chamber and the auxiliary combustion chamber, a dotted line shown as 43 in figure 3 is a horizontal connecting line between the uppermost end of the fire-resistant separation wall and the front furnace wall of the combustion chamber, in figure 3, the right lower part of the boundary line formed by the fire-resistant separation wall and the dotted line is the main combustion chamber, the left upper part of the boundary line formed by the fire-resistant separation wall and the dotted line is the auxiliary combustion chamber, the rear half part in the length direction of the chain grate is positioned below the main combustion chamber, a fuel inlet 8 is arranged between the lower end of the front furnace wall of the main combustion chamber and the chain grate, a material limiting combustion, the material limiting combustion-supporting chamber is provided with a material level indicator and an igniter 13, the material level indicator adopts a rotation-resisting material level indicator 12, the material level indicator, the igniter, a driving motor of a chain grate, an induced draft fan and various temperature measuring sensors arranged on the boiler are all connected to the controller for control as in the existing biomass boiler, a sliding seam is arranged between the inner end of the top of the material limiting combustion-supporting chamber and the front furnace wall of the main combustion chamber, a limiting plate valve 42 is arranged in the sliding seam in a vertically sliding manner, after the limiting plate valve is arranged in the sliding seam, air can still enter the sliding seam, secondary air can enter a secondary air hole from the sliding seam, the limiting plate valve is connected with a positioning device which can adopt a steel wire rope, as long as the limiting plate valve can be limited at a certain height, a primary air port 10 is arranged on the side wall of the furnace body below the chain grate, and a secondary air hole 14 is arranged, the upper portion is provided with tertiary tuber pipe 40 before the main and auxiliary combustion chamber lateral wall, has seted up a plurality of tertiary wind holes 41 on the tertiary tuber pipe, the tertiary wind hole be located the height of flue gas inlet, be provided with many return stroke tube sheet heat exchangers in the furnace body behind the auxiliary combustion chamber, many return stroke tube sheet heat exchangers including the tobacco pipe of many return strokes, the tobacco pipe is full of water outward, the flue gas gets into many return stroke tube sheet heat exchanger's tobacco pipe from the auxiliary combustion chamber, is connected with the draught fan on many return stroke tube sheet heat exchanger's the exhanst gas outlet. The induced draft fan is not shown in the figure.

The multi-return-stroke tube-plate heat exchanger comprises a rear lower smoke box 28, the rear lower smoke box is communicated with a rear upper smoke outlet of an auxiliary combustion chamber, the rear lower smoke box is communicated with a front lower smoke box 36 through a first return-stroke smoke tube 31, the front lower smoke box is communicated with a rear upper smoke box 29 through a second return-stroke smoke tube 33, the rear upper smoke box is communicated with a front upper smoke box 38 through a third return-stroke smoke tube 33, the front upper smoke box is connected with a smoke tube of the next return stroke or is connected with an induced draft fan, in the embodiment, the front upper smoke box is directly connected with a smoke outlet 39, the induced draft fan is connected with the smoke outlet, if the smoke exhaust temperature is higher, the smoke tube of the next return stroke or other heat exchangers can be connected with the front upper smoke box for heat recovery, each smoke tube is inclined, the smoke outlet end is high, and the smoke inlet end is low. The dust removing door 30 is arranged at the corresponding position of the rear lower smoke box and the rear upper smoke box. In the application, due to the effect of the induced draft fan, primary air, secondary air and tertiary air are all air inlet when the boiler operates.

The working process of the boiler is as follows: when the boiler is started during operation, fuel in the storage bin is conveyed into the limiting combustion-supporting chamber through the auger, the igniter ignites the fuel, the material level is controlled by the rotation-resisting type material level meter, the ignited fuel is conveyed backwards under the movement of the chain grate, the height of the fuel on the chain grate is adjusted through the height of the limiting plate valve, when the chain grate is conveyed backwards, primary air enters from the lower part of the grate through the primary air port under the action of induced air of the induced draft fan to realize combustion supporting, the chain grate is discharged into the main combustion chamber to form gas-carbon combustion, secondary air entering from the sliding seam during combustion enters into the main combustion chamber through the secondary air hole to support combustion, flue gas after gasification combustion is formed and enters the auxiliary combustion chamber, tertiary air fed by the tertiary air pipe simultaneously enters the auxiliary combustion chamber, the unburned gasified combustible gas continuously burns in the auxiliary combustion chamber to form high-temperature flue gas, and the high-temperature flue gas enters from the lower rear smoke box and is discharged from the, realize the heat transfer with water in the tobacco pipe, the water in jacket structure and anterior segment heat transfer water pipe, the rear end heat transfer water pipe is also heated simultaneously, and the water after the heating flows from the delivery port. The biomass fuel after burning falls into the slag bin in the base when the traveling grate stoker moves backwards, and is cleaned out through the slag removing port.

After the embodiments of the present invention have been described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above claims, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention all fall within the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments of the examples given in the specification.

Claims

1. Split type two combustion chambers traveling grate stoker biomass boiler, including the furnace body, be provided with the combustion chamber in the furnace body, the traveling grate stoker sets up the below at the combustion chamber in the furnace body, its characterized in that: the combustion chamber is characterized in that a fireproof isolation wall is fixedly connected to the inner rear wall of the combustion chamber, the fireproof isolation wall is upwards tilted from back to front, a flue gas inlet is formed between the upper end of the fireproof isolation wall and the top of the combustion chamber, the combustion chamber is divided into a main combustion chamber and an auxiliary combustion chamber by the fireproof isolation wall, a horizontal connecting line between the uppermost end of the fireproof isolation wall and the front furnace wall of the combustion chamber forms a boundary of the main combustion chamber and the auxiliary combustion chamber, the rear half part in the length direction of a grate is positioned below the main combustion chamber, a fuel inlet is formed between the lower end of the front furnace wall of the main combustion chamber and a chain grate, a material limiting combustion chamber is arranged in the front part of the front furnace wall of the main combustion chamber, the discharge end of a feeding auger is connected to the material limiting combustion chamber, a material level gauge and an igniter are installed on the material limiting combustion chamber, a sliding seam is formed between the inner end of the top, the limiting plate valve is connected with a positioning device, a primary air port is formed in the side wall of the furnace body below the chain grate, secondary air holes are formed in the front furnace wall of the combustion chamber, a tertiary air pipe is arranged on the front upper portion of the side wall of the auxiliary combustion chamber, a plurality of tertiary air holes are formed in the tertiary air pipe, the tertiary air holes are located in the height of a flue gas inlet, a multi-return-stroke tube-plate heat exchanger is arranged in the furnace body behind the auxiliary combustion chamber and comprises a flue pipe with multiple return strokes, the flue pipe is filled with water, the flue gas enters the flue pipe of the multi-return-stroke tube-plate heat exchanger from the auxiliary combustion chamber, and a draught fan is connected to the flue gas outlet of the multi-return-stroke tube.

2. The split type biomass boiler with double combustion chambers and chain grates as claimed in claim 1, is characterized in that: the furnace body is split, the furnace body comprises a base at the lower part and a boiler shell at the upper part of the base, the chain grate is positioned in the base, the combustion chamber is positioned in the boiler shell, and the base is fixedly connected with the boiler shell through a flange.

3. The split type biomass boiler with double combustion chambers and chain grates as claimed in claim 2, is characterized in that: the wall of the pot shell is of a jacket structure, and the jacket structure is filled with water communicated with water outside the smoke pipe.

4. The split type biomass boiler with double combustion chambers and chain grates as claimed in claim 1, is characterized in that: fire-resistant partition include the flame retardant coating and support the heat transfer water pipe under the flame retardant coating, the heat transfer water pipe comprises many back end heat transfer water pipes and many anterior segment heat transfer water pipes, the rear end intercommunication jacket structure of many back end heat transfer water pipes, be connected with middle horizontal heat transfer water pipe between many back end heat transfer water pipes and the many anterior segment heat transfer water pipes, many anterior segment heat transfer water pipe upper ends are connected with the horizontal heat transfer water pipe in upper end, the both ends of middle horizontal heat transfer water pipe and the horizontal heat transfer water pipe in upper end all communicate jacket structure, the ascending angle of elevation of back end heat transfer water pipe and anterior segment heat transfer water pipe is different.

5. The split type biomass boiler with double combustion chambers and chain grates as claimed in claim 1, is characterized in that: the multi-return-stroke tube-plate heat exchanger comprises a rear lower smoke box, the rear lower smoke box is communicated with a rear upper smoke outlet of the auxiliary combustion chamber, the rear lower smoke box is communicated with a front lower smoke box through a first return-stroke smoke tube, the front lower smoke box is communicated with a rear upper smoke box through a second return-stroke smoke tube, the rear upper smoke box is communicated with a front upper smoke box through a third return-stroke smoke tube, and the front upper smoke box is connected with a smoke tube of the next return stroke or connected to a smoke exhaust port.

6. The split type biomass boiler with double combustion chambers and chain grates as claimed in claim 1, is characterized in that: each smoke tube be the slope form, the flue gas outlet end is high, the flue gas inlet end is low.