CN117053199A

CN117053199A - Straw burning system

Info

Publication number: CN117053199A
Application number: CN202310673878.0A
Authority: CN
Inventors: 吕群丹; 陈辉; 丁言炳; 陈军华; 方洁; 潘俊杰; 洪碧伟; 吴剑锋
Original assignee: Lishui Academy Of Agricultural And Forestry Sciences; Lishui Crop General Station; Zhejiang Yibilian Environmental Protection Equipment Co ltd; Zhejiang Bifeng Agricultural Development Co ltd
Current assignee: Lishui Academy Of Agricultural And Forestry Sciences; Lishui Crop General Station; Zhejiang Yibilian Environmental Protection Equipment Co ltd; Zhejiang Bifeng Agricultural Development Co ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2023-11-14

Abstract

The application discloses a straw incineration system, which sequentially comprises an incinerator and a vertical furnace body according to the flow direction of flue gas, wherein the furnace body is internally used for burning straws to be treated, and a flue outlet is formed in the top of the furnace body; the secondary combustion device is provided with a jacket structure, an inner cavity and a jacket space arranged at the periphery of the inner cavity, the flue gas from the flue outlet is mixed with the air flow from the jacket space in the inner cavity to perform secondary combustion, and an oil delivery pipe for supplying fuel oil to the inner cavity is also arranged in the secondary combustion device; the spraying device is used for circularly spraying the smoke after secondary combustion; and the filtering device is used for filtering and discharging the sprayed flue gas. According to the straw incineration system provided by the application, carbon particles and combustible gas are removed from flue gas generated by burning straw in the furnace body through the secondary combustion device, and solid particles and harmful substances in the flue gas are removed through the spraying device and the filtering device, so that clean combustion in the furnace of the straw is realized.

Description

Straw burning system

Technical Field

The application relates to the technical field of biomass boilers, in particular to a straw burning system.

Background

The straw is an important component of biomass resources, and a large amount of straw is piled in the field or directly burned to cause resource waste and environmental pollution. The open-air combustion environment of the straw is open, the range is wide, the quantity is large, both combustion and pollution emission are difficult to control, and the combustion in the furnace can limit the combustion of the straw and the pollution emission in a limited space, so that the pollution emission reduction of the straw is facilitated. The straw combustion is easy to generate carbon particles and combustible gas, and the common incinerator lacks corresponding configuration, so that the requirements of clean combustion in the straw furnace cannot be met.

Disclosure of Invention

The application provides a straw burning system for realizing clean combustion in a straw furnace.

A straw incineration system, comprising in order according to the flue gas flow direction:

the incinerator comprises a vertically arranged furnace body, wherein the furnace body is used for combusting straws to be treated, and a smoke outlet is formed in the top of the furnace body;

the secondary combustion device is provided with a jacket structure, an inner cavity and a jacket space arranged at the periphery of the inner cavity, the flue gas from the flue outlet is mixed with the air flow from the jacket space in the inner cavity to perform secondary combustion, and an oil delivery pipe for supplying fuel oil to the inner cavity is also arranged in the secondary combustion device;

the spraying device is used for circularly spraying the smoke after secondary combustion;

and the filtering device is used for filtering and discharging the sprayed flue gas.

The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.

Optionally, the furnace body includes:

the furnace wall is cylindrical as a whole and is vertically arranged on the axis;

the grate comprises a plurality of grate bars which are arranged at intervals, and the inner part of the furnace wall is divided into a combustion chamber at the upper part and an ash discharging chamber at the lower part;

the combustion-supporting cylinder is vertically arranged in the combustion chamber, the bottom of the combustion-supporting cylinder is an air flow inlet, the inside of the combustion-supporting cylinder is an air supply flow channel, and the cylinder wall of the combustion-supporting cylinder is provided with a plurality of air holes communicated with the combustion chamber.

Optionally, the furnace wall includes a top wall with a reversible charging door and a traction mechanism for pulling the charging door upside down, and a peripheral wall disposed around an edge of the top wall.

Optionally, the secondary combustion device includes:

the bottom of the inner cylinder is an inlet and is communicated with the smoke outlet, the top of the inner cylinder is an outlet for discharging smoke after secondary combustion, and the side wall of the inner cylinder is provided with an air inlet;

the outer cylinder is sleeved on the periphery of the inner cylinder, a jacket space is formed between the outer cylinder and the inner cylinder, and the outer cylinder is communicated with the air inlet;

and the air supply device is communicated with the jacket space.

Optionally, a bracket is suspended in the inner cylinder, and a fuel core is arranged on the bracket.

Optionally, the secondary combustion device further comprises an oil supply pipe extending above the fuel core.

Optionally, the top of the inner cylinder is provided with a diameter reduction section, the plurality of air inlets are distributed around the circumference, and the distribution area is adjacent to the diameter reduction section.

Optionally, the secondary combustion device further comprises an extension pipeline in abutting communication with the diameter reduction section, wherein the extension pipeline is arranged opposite to the outlet diameter expansion of the diameter reduction section and extends upwards in the height direction.

Optionally, the spraying device includes:

the liquid containing tank is used for containing spray liquid, one part of the bottom surface of the liquid containing tank is arranged on the top surface of the furnace body, and the other part of the bottom surface of the liquid containing tank is supported by corresponding upright posts;

the first tower body is vertically arranged in the liquid containing tank, the bottom of the first tower body is opened in the liquid containing tank or communicated with the liquid containing tank through a return pipe, and the side wall of the first tower body is communicated with the extension pipeline;

the spray header is arranged in the first tower body to output spray liquid;

and the circulating pump assembly drives the spray liquid to be supplied to the spray header from the liquid containing tank.

Optionally, the filtering device includes:

the second tower body is vertically arranged in the liquid containing tank, the bottom of the second tower body is communicated with the top of the first tower body so as to receive sprayed flue gas, and the top of the second tower body is a discharge port;

and the filter element assembly is arranged in the second tower body.

The application provides a straw incineration system which comprises an incinerator, a secondary combustion device, a spraying device and a filtering device. The flue gas generated by burning the straw in the furnace body is subjected to secondary combustion to remove carbon particles and combustible gas, and then is subjected to spray device and filter device to remove solid particles and harmful substances in the flue gas, so that clean combustion of the straw in the furnace is realized.

Drawings

FIG. 1 is a schematic view of a straw burning system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of the straw incineration system in fig. 1, with the operating platform omitted;

FIG. 3 is a schematic view of the structure of the furnace body;

FIG. 4 is a schematic view of the structure of the inside of the furnace body;

FIG. 5 is a schematic view of the grate mounting position;

FIG. 6 is a schematic structural view of a secondary combustion device;

FIG. 7 is a schematic view of the internal structure of the secondary combustion device;

FIG. 8 is a cross-sectional view taken at A-A of FIG. 7;

fig. 9 is a schematic view of the structure of the shower device and the filter device.

Reference numerals in the drawings are described as follows:

10. an incinerator; 11. a furnace body; 12. a smoke outlet; 13. a furnace wall; 14. a grate bar; 15. a combustion supporting cylinder; 16. an operating platform; 17. a lifter; 18. a top wall; 19. a fixed wall;

20. a secondary combustion device; 21. a jacket space; 22. an oil delivery pipe; 23. a charging door; 24. a traction mechanism; 25. a peripheral wall; 26. a combustion chamber; 27. an ash discharging chamber; 28. an operation handle; 29. an ash outlet door;

30. a spraying device; 31. an air inlet; 32. a column; 33. air holes; 34. an inner cylinder; 35. an outer cylinder; 36. a gas supply device; 37. an inlet; 38. an outlet; 39. an air inlet;

40. a filtering device; 41. a tray; 42. a connecting piece; 44. an electric ignition device; 45. igniting the head; 46. a blower; 47. an air supply pipe; 48. an extension pipe; 49. a liquid container;

50. a first tower; 51. a second tower; 52. a discharge port; 53. fixing the grate bars; 54. a movable grate bar; 55. a support housing; 56. and a supporting frame.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 3, the straw incineration system disclosed by the application sequentially comprises an incinerator 10, a secondary combustion device 20, a spraying device 30 and a filtering device 40 according to the flow direction of flue gas.

The incinerator 10 comprises a vertically arranged furnace body 11, straw to be treated is combusted in the furnace body 11, a smoke outlet 12 is formed in the top of the furnace body 11, the straw is combusted in the furnace body 11, and generated smoke is led out from the smoke outlet 12. The secondary combustion device 20 has a jacket structure and defines an inner cavity and a jacket space 21 at the periphery of the inner cavity, and the flue gas from the flue gas outlet 12 is mixed with the air flow from the jacket space in the inner cavity to carry out secondary combustion, and an oil delivery pipe 22 for supplying fuel oil to the inner cavity is also arranged in the secondary combustion device 20. The fuel oil burned in the inner cavity of the secondary combustion device 20 ignites carbon particles and combustible gas in the flue gas.

The spraying device 30 circularly sprays the smoke after secondary combustion, removes dust and soluble gas in the smoke, and then enters the filtering device 40 after being sprayed and cooled, and the filtering device 40 filters the sprayed smoke and then discharges the smoke into the atmosphere.

The secondary combustion device 20, the spraying device 30 and the filtering device 40 are arranged to treat the flue gas generated by straw combustion in the furnace body 11, the combustible gas generated by straw combustion is ignited and removed, and then the spraying device 30 and the filtering device 40 are introduced to remove solid particles and harmful substances in the flue gas, so that clean combustion of the straw in the incinerator is realized.

In some embodiments, as shown in fig. 1-5, the top periphery of the furnace body 11 is further configured with a handling platform 16, and a plurality of upright posts 32 are used as supports below the handling platform 16. An elevator 17 is also provided above the operating platform 16 to facilitate lifting of the straw fuel from the ground to the operating platform 16.

The furnace body 11 comprises a furnace wall 13, a grate 14 and a combustion-supporting cylinder 15. The furnace wall 13 is cylindrical in shape as a whole and has a circular cross section with its axis standing. The furnace wall 13 comprises a top wall 18 and a peripheral wall 25 arranged around the edge of the top wall 18. The top wall 18 comprises two semicircular parts which are spliced with each other, wherein the semicircular part is a fixed wall 19 and is provided with a smoke outlet 12; the other semicircular part is used as a charging door 23, and the two semicircular parts are hinged with each other at the spliced diameter part.

The fixed wall 19 is also provided with a traction mechanism 24, the traction mechanism 24 tightens a traction rope to pull the charging door 23 to rotate around a hinged position to open during charging, straw fuel placed on the operating platform 16 is put into the furnace wall 13, and after charging is completed, the traction mechanism 24 loosens the traction rope, and the charging door 23 is closed. The traction mechanism 24 is arranged to open or close the charging door 23, so that charging operation is facilitated, and meanwhile, the charging door 23 can be prevented from being heated to scald operators.

The grate bars 14 comprise a plurality of grate bars which are arranged at intervals, two ends of each grate bar 14 are arranged on the peripheral wall 25, one part is a fixed grate bar 53, and the other part is a movable grate bar 54 which is movably inserted into the peripheral wall. Between two adjacent movable bars 54 are arranged 1-6 fixed bars 53, one end of each movable bar 54 extends out of the peripheral wall 25, and the extending part is provided with an operating handle 28. The movable grate bars 54 can be moved out of the peripheral wall 25 by operating the operating handle 28, the density of the grate bars 14 can be adjusted according to the shape and performance of the specific straw fuel, the combustion requirement of the straw fuel can be met, or the movable grate bars 54 can be moved out when the furnace body 11 is cleaned. Meanwhile, the operating handle 28 is arranged on the outer side of the peripheral wall 25, and is operated outside the furnace body 11 when adjustment is needed, so that adjustment is more convenient.

The grate 14 divides the interior of the furnace wall 13 into an upper combustion chamber 26 and a lower ash discharge chamber 27, and the ash discharge chamber 27 is provided with an ash discharge door 29 and an air inlet 31. After the straw fuel enters the combustion chamber 26 from the charging door 23 of the top wall 18, the straw is ignited, air is blown into the ash discharging chamber 27 from the air inlet 31 by being connected with a blower (omitted from the figure), and the air enters the combustion chamber 26 from the gap of the grate 25, so that oxygen is provided to support the combustion of the straw.

The combustion chamber 26 is internally provided with a combustion-supporting cylinder 15 in a standing manner, the bottom of the combustion-supporting cylinder 15 is provided with an air flow inlet which is communicated with an ash outlet chamber 27 or extends out of a peripheral wall 25 through a blast pipe to be externally connected with a blower. The combustion-supporting cylinder 15 is internally provided with an air supply flow passage, and the cylinder wall of the combustion-supporting cylinder 15 is provided with a plurality of air holes 33 communicated with the combustion chamber 26. The air holes 33 include a plurality of groups, each group being distributed at different positions in the circumferential direction, a plurality of groups being distributed between the groups, the air holes 33 of different groups being distributed at different positions in the axial direction of the combustion cylinder 15, the air holes 33 being bar-shaped holes and extending in the height direction. The air is uniformly dispersed at all corners of the combustion chamber 26 through a plurality of groups of air holes 33, so that the straw fuel can be fully combusted.

Ash from the combustion of the straw falls from the gaps of the grate bar 14 into the ash discharge chamber 27 and is removed from the ash discharge door 29 out of the ash discharge chamber 27. The flue gas generated by combustion is led out from the flue gas outlet 12 and enters the secondary combustion device 20.

In some embodiments, as shown in fig. 6-8, the secondary combustion device 20 includes an inner barrel 34, an outer barrel 35, and a gas supply 36, the bottom of the inner barrel 34 being an inlet 37 and communicating with the outlet 12, and the top of the inner barrel 34 being an outlet 38 for discharging post-secondary combustion flue gas. The top of the inner cylinder 34 is provided with a diameter reduction section, the side wall of the inner cylinder 34 is provided with air inlets 39, a plurality of air inlets 39 are distributed around the circumference, and the distribution area is adjacent to the diameter reduction section.

The outer cylinder 35 is sleeved on the outer periphery of the inner cylinder 34, a jacket space 21 is arranged between the outer cylinder 35 and the inner cylinder 34 and is communicated with an air inlet 39, and an air supply device 36 is communicated with the jacket space 21. The air supply device 36 includes a fan 46 and an air supply pipe 47. One end of the air supply pipe 47 is connected to an air outlet of the fan 46, and the other end extends into the outer cylinder 35. The fan 46 delivers air along the air supply tube 47 to the jacket space 21 between the outer cylinder 35 and the inner cylinder 34, and the air enters the inner cylinder 34 from the air inlet 39 provided in the wall of the inner cylinder 34 to provide sufficient oxygen for combustion of the flue gas.

The inner cylinder 34 is suspended with a bracket, the bracket comprises a tray 41 and a connecting piece 42, the tray 41 is disc-shaped, and the circle center of the tray 41 coincides with the circle center of the inner cylinder 34. The tray 41 has symmetrically extending connectors 42 around the outer periphery thereof, the connectors 42 being connected to the inner side wall of the inner tube 34, and a combustion core (not shown) which may be made of asbestos or other heat resistant fibers is provided in the tray 41.

The upper side of the combustion core is provided with an oil delivery pipe 22, the end of the oil delivery pipe 22 is provided with an oil nozzle (omitted in the figure) facing the combustion core, the side wall of the inner cylinder 34 is also provided with an electric ignition device 44, and the electric ignition device 44 is provided with an ignition head 45 extending to the upper side of the combustion core. The fuel injector sprays fuel to the combustion core, the electric ignition device 44 ignites the fuel, and the burnt fuel is removed after the carbon particles and the combustible gas in the flue gas passing through the inner cylinder 34 are ignited and completely burnt.

The secondary combustion device 20 further includes an extension pipe 48 in abutting communication with the reduced diameter section, the extension pipe 48 being disposed in enlarged diameter relative to the outlet of the reduced diameter section and extending upwardly in the height direction. A support housing 55 is fixed to the outer periphery of the outer tube 36, and the bottom end of the extension pipe 48 is fixed to the support housing 55. The support housing 55 provides support for the extension pipe 24 and the secondary combustion device 20, ensuring structural stability of the secondary combustion device 20. The post-combusted flue gas is introduced into the spraying device 30 through the extension pipe 48.

In some embodiments, as shown in fig. 9, the spray device 30 includes a liquid reservoir 49, a first tower 50, a spray header, and a circulation pump assembly. The liquid container 49 is used for containing spray liquid, and a part of the bottom surface of the liquid container 49 is arranged on the top surface of the furnace body 11, and the other part is supported by the corresponding upright post 32. The first tower 50 is vertically arranged in the liquid containing groove 49, the bottom of the first tower 50 is opened in the liquid containing groove 49 or communicated with the liquid containing groove 49 through a return pipe, and the side wall of the first tower 50 is communicated with the extension pipeline 48. A spray header (not shown) is provided in the first tower 50 to output spray liquid, and a circulation pump assembly (not shown) drives the spray liquid to be supplied from the liquid container 49 to the spray header.

The flue gas after secondary combustion treatment is led out from the extension pipeline 48 and is led into the bottom of the first tower body 50, and the spray liquid contained in the liquid containing tank 49 is pressurized by the circulating pump assembly and then enters the upper part of the first tower body 50, and is sprayed out by the spray header. The spray liquid contacts with the flue gas after the secondary combustion treatment in the first tower body 50, and the spray liquid removes solid particles and harmful substances in the flue gas after the secondary combustion treatment, and then flows back to the liquid containing tank 49 from the bottom of the first tower body 50 for recycling. The flue gas subjected to spray purification and temperature reduction is led out from the top of the first tower body 50 and enters the filtering device 40 through a pipeline.

In some embodiments, the filtering device 40 includes a second tower 51 and a filter element assembly (omitted in the drawings), the second tower 51 is vertically placed in the liquid containing tank 49, the bottom of the second tower 51 is communicated with the top of the first tower 50 to receive the sprayed flue gas, and the top of the second tower 51 is a discharge port 52.

The filter element assembly is mounted in the second tower 51, and may be axially provided with multiple groups as required. The sprayed flue gas enters the bottom of the second tower body 51 from the top of the first tower body 50 through a pipeline, and further removes carried solid particles and harmful substances after passing through the filter element assembly, and the fully purified flue gas is discharged into the atmosphere through a discharge port 52 at the top of the second tower body 51, so that environmental pollution is avoided. Meanwhile, the high-temperature flue gas is prevented from damaging the filter element assembly when passing through the filter element assembly by spraying and cooling and then being introduced into the filtering device 40.

The top of the liquid container 49 is provided with a supporting frame 56, and the first tower 50 and the second tower 51 are fixed on the supporting frame 56. The tops of the first tower body 50 and the second tower body 51 are provided with a diameter-reducing section. The tower top is provided with the diameter-reducing section, so that the residence time of the flue gas in the tower body is prolonged, and dust and harmful substances in the flue gas are removed more effectively.

According to the straw incineration system disclosed by the application, the smoke outlet 12 of the incinerator 10 is connected with the secondary combustion device 20, the spraying device 30 and the filtering device 40, combustible substances, solid particles and other harmful gases in smoke generated by straw combustion are removed and then exhausted to the atmosphere, so that clean combustion of straw fuel in the incinerator is realized.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When technical features of different embodiments are embodied in the same drawing, the drawing can be regarded as a combination of the embodiments concerned also being disclosed at the same time.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims

1. Straw burning system, its characterized in that includes according to the flue gas flow direction in proper order:

2. The straw burning system according to claim 1, wherein the furnace body comprises:

3. A straw burning system according to claim 2, wherein the furnace wall comprises a top wall and a peripheral wall arranged around an edge of the top wall, the top wall carrying a reversible charging door and a traction mechanism for pulling the charging door upside down.

4. The straw burning system according to claim 1, wherein the secondary combustion device comprises:

and the air supply device is communicated with the jacket space.

5. The straw burning system according to claim 4, wherein a bracket is suspended in the inner barrel, and a fuel core is provided on the bracket.

6. The straw burning system according to claim 5, wherein the secondary combustion device further comprises an oil supply pipe extending above the combustion core.

7. The straw burning system according to claim 4, wherein the top of the inner cylinder has a reduced diameter section, the air inlets are circumferentially distributed in plurality, and the distribution area is adjacent to the reduced diameter section.

8. The straw burning system according to claim 7, wherein the secondary combustion device further comprises an extension pipe in abutting communication with the reduced diameter section, the extension pipe being disposed in enlarged diameter relative to the outlet of the reduced diameter section and extending upward in the height direction.

9. The straw burning system according to claim 8, wherein the spraying device comprises:

the spray header is arranged in the first tower body to output spray liquid;

10. The straw burning system according to claim 8, wherein the filtering means comprises:

and the filter element assembly is arranged in the second tower body.