Straw coupling combustion furnace
By designing a layered combustion structure of straw and coal in a straw boiler, the problem of straw with a moisture content of more than 30% cannot be used is solved, efficient combustion and energy-saving effects are achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202421530877.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The existing straw boilers are not suitable for straw with a moisture content of more than 30%, resulting in the inability to effectively utilize straw with a higher moisture content as fuel.
A straw coupling combustion furnace is designed. By setting a layered combustion structure of straw and coal in the boiler body, the straw is dried and ignited by the initial combustion of coal, and the utilization efficiency of flue gas waste heat is improved through an energy-saving device.
Effective combustion of straw with a moisture content of more than 30% is achieved, combustion efficiency and thermal power efficiency are improved, production costs are reduced, and fuel and operation costs are saved.
Smart Images
Figure CN222798964U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of boilers, in particular to a straw coupled combustion furnace. Background Art
[0002] As efforts to improve the environment and reduce air pollution continue to intensify, agricultural straw residues are being required to be comprehensively utilized, and direct burning in the field is prohibited. Agricultural straw residues are a renewable energy source, with several uses beyond energy production. Currently, it is primarily used for heating in the boiler industry. The typical process involves baling the straw in the field, transporting it to a factory, screening it for impurities, crushing it, drying it, and granulating it before using it as fuel for industrial production and residential boiler heating. Existing straw-fired boilers have strict requirements for the moisture content of straw, and typical direct-fired straw boilers are not suitable for straw with a moisture content above 30%.
[0003] Therefore, the present application proposes a straw coupling combustion furnace which is still applicable to straw with a moisture content higher than 30% to solve the above problems. Utility Model Content
[0004] This utility model is developed to address the problem that existing straw boilers are unsuitable for straw with a moisture content exceeding 30%. The following is a brief overview of the utility model to provide a basic understanding of certain aspects of the utility model. It should be understood that this overview is not an exhaustive overview of the utility model. It is not intended to identify key or important aspects of the utility model, nor is it intended to limit the scope of the utility model.
[0005] The technical solution of this utility model:
[0006] A straw coupled combustion furnace comprises a boiler body, a grate is arranged below the boiler body, a straw feeding port and a coal feeding port are installed on the boiler body, and the straw feeding port is arranged above the coal feeding port.
[0007] Furthermore, a straw feeding device is installed on the straw feed port, and the straw feed port is connected to the interior of the boiler body through an auger conveyor. The straw feeding device includes a straw loader and a straw hopper. The straw hopper is connected to the boiler body through the straw feed port, and the straw loader is connected to the feeding end of the straw hopper. A buffer table is provided in the boiler body, and the output end of the auger conveyor is arranged above the buffer table.
[0008] Furthermore, a coal feeding device is installed on the coal feed port, which includes a coal loader and a coal hopper. The coal hopper is connected to the boiler body through the coal feed port. The coal hopper is arranged below the straw hopper, and the coal loader is connected to the feeding end of the coal hopper.
[0009] Furthermore, the boiler body is connected to a smoke and air duct, the other end of the smoke and air duct is connected to the induced draft fan, the output end of the induced draft fan is connected to the induced draft fan outlet pipe, and the induced draft fan outlet pipe is connected to the chimney.
[0010] Furthermore, an upper drum and a lower drum are installed in the boiler body, the upper drum is processed with a water inlet, and the lower drum is processed with a water outlet. The upper drum is connected to the lower drum through the first convection tube bundle and the second convection tube bundle.
[0011] Furthermore, the upper drum is communicated with the front water-cooled wall and the side water-cooled wall. The front water-cooled wall and the side water-cooled wall are installed in the boiler body. A furnace rear arch is also provided in the boiler body.
[0012] Furthermore, an insulation wall is installed on the inner wall of the boiler body.
[0013] Furthermore, a grate reducer is installed on the boiler body, the grate reducer is connected to the grate, the grate is a chain grate, and the furnace coal layer and the straw combustion layer are arranged in sequence on the grate.
[0014] Furthermore, the boiler body is connected to an air inlet duct, and the other end of the air inlet duct is connected to the blower.
[0015] Furthermore, a first energy saver, a second energy saver and a third energy saver are sequentially installed in the boiler body from top to bottom.
[0016] The utility model has the following beneficial effects:
[0017] 1. The utility model solves the problem that straw cannot be used as fuel because its moisture content exceeds 30%. The utility model adopts a straw feeding device arranged above the coal feeding device. Bulk straw and coal are fed into the boiler body for combustion in layers. The coal is above the grate and the bulk straw is above the coal. The coal is burned first before entering the furnace. The height difference is used to dry and ignite the bulk straw fed from above. The temperature in the combustion chamber is high and the thermal power efficiency is high. Through the straw and coal coupled combustion technology, the bulk straw is gasified and burned in the boiler, which burns fully, has little environmental pollution, and has high thermal power and thermal efficiency. This reduces production costs. Compared with power station boilers, the utility model is simple and easy to operate, can save 50% of costs, and also saves fuel costs.
[0018] 2. A straw coupled combustion furnace of the utility model is provided with a first energy saver, a second energy saver and a third energy saver from top to bottom near the smoke and air duct in the boiler body. The three layers of energy savers are used to exchange heat with the waste heat of the exhaust flue gas, thereby improving the utilization of the waste heat of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a main view of a straw coupled combustion stove;
[0020] Figure 2 It is a side view of a straw coupled combustion stove;
[0021] Figure 3 It is a top view of a straw coupled combustion furnace.
[0022] In the figure: 1- boiler body, 2- straw loading device, 3- coal loading device, 4- grate, 5- smoke and air duct, 6- induced draft fan, 7- induced draft fan outlet duct, 8- chimney, 9- insulation wall, 10- front water-cooled wall, 11- upper boiler drum, 12- lower boiler drum, 13- furnace rear arch, 14- first convection tube bundle, 15- second convection tube bundle, 16- side water-cooled wall, 17- first economizer, 18 -Second energy saver, 19-Third energy saver, 20-Straw loader, 21-Straw hopper, 22-Straw feeding port, 23-Coal loader, 24-Coal hopper, 25-Coal feeding port, 26-Coal layer in furnace, 27-Straw combustion layer, 28-Air inlet, 29-Blower, 30-Water inlet, 31-Water outlet, 32-Grate reducer, 33-Auger conveyor, 34-Buffer platform. DETAILED DESCRIPTION
[0023] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments illustrated in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.
[0024] The connections mentioned in this utility model are divided into fixed connections and detachable connections. The fixed connections (i.e., non-detachable connections) include but are not limited to conventional fixed connection methods such as hemming, rivet connection, bonding connection, and welding connection. The detachable connections include but are not limited to conventional detachable methods such as threaded connection, snap connection, pin connection, and hinge connection. When the specific connection method is not clearly specified, it is assumed that at least one connection method can always be found among the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example, a welded connection is selected for a fixed connection, and a hinge connection is selected for a detachable connection.
[0025] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0026] Example 1, combined Figure 1-Figure 3 To illustrate this embodiment, a straw coupled combustion furnace of this embodiment includes a boiler body 1, a grate 4 is provided below the boiler body 1, a straw feed port 22 and a coal feed port 25 are installed on the boiler body 1, and the straw feed port 22 is arranged above the coal feed port 25.
[0027] A straw loading device 2 is installed on the straw feed port 22. The straw feed port 22 is connected to the interior of the boiler body 1 through an auger conveyor 33. A buffer table 34 is provided in the boiler body 1. The output end of the auger conveyor 33 is arranged above the buffer table 34. When bulk straw enters the boiler body 1 through the straw feed port 22, the buffer table 34 is a table body that is recessed into the boiler body 1, which slows down the falling speed of the straw. On the one hand, the high temperature in the boiler body 1 prolongs the drying time of the straw and improves the drying effect of the straw. On the other hand, it avoids straw blockage, which causes the straw to be burned during the descent process. The flame in the boiler body can easily pass through the straw feed port and cause flame reflux. The straw feeding device 2 includes a straw feeding machine 20 and a straw hopper 21. The straw feeding machine 20 is connected to the boiler body 1 through the straw hopper 21. The straw hopper 21 is connected to the inside of the boiler body 1 through the straw feeding port 22. The coal feeding machine 23 of the coal feeding device 3 is connected to the boiler body 1 through the coal hopper 24. The coal hopper 24 is connected to the inside of the boiler body 1 through the coal feeding port 25. The coal hopper 24 is arranged below the straw hopper 21. Bulk straw is fed through the straw feeding machine 20. The straw is fed into the boiler body 1 through the straw feed port 22 of the straw hopper 21 and falls onto the grate 4 in the boiler body 1 through the auger conveyor 33. The coal is fed into the boiler body 1 through the coal feeder 23 and falls onto the grate 4 through the coal feed port 25 of the coal hopper 24. First, the coal falls on the grate 4 and is fully burned to form a coal layer 26 in the furnace. Then, the bulk straw falls into the boiler body 1 and is heated and dried by the height difference before falling on the grate 4. Then, the straw falls above the coal layer 26 in the furnace to form a straw combustion layer 27.
[0028] Above the grate 4 is the main combustion zone in the boiler body 1. An insulation wall 9 is installed on the inner wall of the boiler body 1 to alleviate heat loss from the boiler body 1. The grate 4 adopts a chain grate or a reciprocating grate, and is powered by a grate reducer 32 installed on the outside of the boiler body 1. Under the action of the grate reducer 32, the grate 4 moves at a uniform speed, and the fuel coal continuously enters the furnace for combustion on the grate 4. The boiler body 1 is equipped with an air inlet 28, and natural air is supplied by a blower 29 connected to the air inlet 28. The natural air enters the furnace through the gaps in the grate 4, so that the coal and straw are fully burned, thereby realizing heat energy supply;
[0029] An upper drum 11 and a lower drum 12 are installed in the boiler body 1. The upper drum 11 and the lower drum 12 are arranged in the main combustion zone of the boiler body 1. The upper drum 11 is arranged above the lower drum 12. A water inlet 30 is processed on the upper drum 11, and a water outlet 31 is processed on the lower drum 12. The upper drum 11 and the lower drum 12 are connected through a first convection tube bundle 14 and a second convection tube bundle 15. The upper drum 11 is also connected to the front water-cooled wall 10 and the side water-cooled wall 16. Under the action of full combustion of the coal layer 26 and the straw combustion layer 27 in the furnace on the grate 4, heat energy is provided thereto. A furnace rear arch 13 is also provided in the boiler body 1. The function of the furnace rear arch 13 is to slow down the flow rate of the flue gas to prevent the excessive air flow speed from causing the dynamic pressure in the furnace of the boiler body 1, resulting in unstable combustion in the boiler body 1.
[0030] An induced draft fan 6 is provided on the outside of the boiler body 1, and the induced draft fan 6 is connected to the boiler body 1 through the smoke and air duct 5. When the induced draft fan 6 is turned on, the flue gas in the boiler body 1 flows to the smoke and air duct 5. During the flow of the waste heat flue gas, heat is exchanged with the first economizer 17, the second economizer 18 and the third economizer 19 respectively, making full use of the waste heat of the flue gas. The flue gas after heat exchange is discharged through the smoke and air duct 5, passes through the induced draft fan outlet pipe 7 and the chimney 8 in sequence, and is finally discharged from the body through the chimney 8.
[0031] This embodiment is only an illustrative description of the present application and does not limit its scope of protection. Those skilled in the art may also make partial changes to it. As long as they do not exceed the spirit of the present application, they are all within the scope of protection of the present application.
Claims
1. A straw coupled combustion furnace, characterized in that: The boiler comprises a boiler body (1), a grate (4) is arranged below the boiler body (1), a straw feed port (22) and a coal feed port (25) are installed on the boiler body (1), and the straw feed port (22) is arranged above the coal feed port (25).
2. A straw coupled combustion furnace according to claim 1, characterized in that: The straw feeding port (22) is provided with a straw feeding device (2), and the straw feeding port (22) is connected to the interior of the boiler body (1) through an auger conveyor (33); the straw feeding device (2) comprises a straw feeding device (20) and a straw hopper (21), the straw hopper (21) is connected to the boiler body (1) through the straw feeding port (22), and the straw feeding device (20) is connected to the feeding end of the straw hopper (21); a buffer platform (34) is provided in the boiler body (1), and the output end of the auger conveyor (33) is arranged above the buffer platform (34).
3. A straw coupled combustion furnace according to claim 2, characterized in that: The coal feeding port (25) is provided with a coal feeding device (3), the coal feeding device (3) comprising a coal feeding machine (23) and a coal hopper (24), the coal hopper (24) being connected to the boiler body (1) through the coal feeding port (25), the coal hopper (24) being arranged below the straw hopper (21), and the coal feeding machine (23) being connected to the feeding end of the coal hopper (24).
4. A straw coupled combustion furnace according to any one of claims 1 to 3, characterized in that: The boiler body (1) is connected to a smoke and air duct (5), the other end of the smoke and air duct (5) is connected to an induced draft fan (6), the output end of the induced draft fan (6) is connected to an induced draft fan air outlet duct (7), and the induced draft fan air outlet duct (7) is in communication with a chimney (8).
5. A straw coupled combustion furnace according to any one of claims 1 to 3, characterized in that: An upper drum (11) and a lower drum (12) are installed in the boiler body (1); a water inlet (30) is processed on the upper drum (11), and a water outlet (31) is processed on the lower drum (12); the upper drum (11) is connected to the lower drum (12) through a first convection tube bundle (14) and a second convection tube bundle (15).
6. The straw coupled combustion furnace according to claim 5, characterized in that: The upper drum (11) is connected to the front water-cooling wall (10) and the side water-cooling wall (16); the front water-cooling wall (10) and the side water-cooling wall (16) are installed in the boiler body (1); and a furnace rear arch (13) is also arranged in the boiler body (1).
7. The straw coupled combustion furnace according to claim 6, characterized in that: A heat-insulating wall (9) is installed on the inner wall of the boiler body (1).
8. A straw coupled combustion furnace according to any one of claims 1 to 3, characterized in that: The boiler body (1) is provided with a grate reducer (32), the grate reducer (32) is connected to the grate (4), the grate (4) is a chain grate, and the furnace coal layer (26) and the straw combustion layer (27) are arranged in sequence on the grate (4).
9. A straw coupled combustion furnace according to any one of claims 1 to 3, characterized in that: The boiler body (1) is connected to an air inlet duct (28), and the other end of the air inlet duct (28) is connected to a blower (29).
10. A straw coupled combustion furnace according to any one of claims 1 to 3, characterized in that: A first energy saver (17), a second energy saver (18) and a third energy saver (19) are sequentially installed in the boiler body (1) from top to bottom.