Biomass gasification furnace with steam under grate

Abstract

The application relates to the technical field of biomass gasification furnaces, and discloses a biomass gasification furnace with steam passing below the grate, which comprises a gasification furnace body, a feeding chamber for feeding materials to the top end of a chain grate is arranged on one side of the gasification furnace body, and the chain grate is driven to rotate by a driving assembly; a steam assembly is arranged on the outer side of the gasification furnace body, and the steam assembly comprises a steam pipeline for passing steam. After steam passes below the chain grate, a huge temperature difference is generated between the steam with multiple degrees Celsius and the environment, so that the steam absorbs a large amount of heat, and the heat is taken into the reduction layer in the gasification furnace body along with the rising of the steam, so that the reaction heat is provided; thus, the ash and slag can be prevented from reaching a molten state, so that the coking of the inner side of the gasification furnace body is prevented; and after the steam passes below the chain grate, the steam takes away part of the heat of the chain grate, so that the chain grate is cooled.

Description

Technical Field

[0001] This application relates to the technical field of biomass gasification furnaces, and in particular to a biomass gasification furnace with steam passing under the grate. Background Technology

[0002] Biomass gasification technology is a thermochemical conversion technology of biomass. It involves using biomass fuel, mainly agricultural and forestry waste, under incomplete combustion conditions. The higher molecular weight organic hydrocarbon chains in the biomass fuel undergo four processes: oxidation, reduction, pyrolysis, and drying, to transform into combustible gases such as CO, H2, and CH4 with lower molecular weight. The combustible gases are then fed into a combustion device to generate heat, thereby achieving energy conversion. The device that adds biomass to the furnace to react and generate biomass gas is called a biomass gasifier. Currently, the most commonly used gasifier on the market is the fixed-bed gasifier. When the gasifier is combined with a chain grate in a boiler, it forms a chain grate gasifier, which facilitates the removal of slag and ash from the gasifier.

[0003] After biomass fuel is burned in a biomass gasifier, the ash slag has a lower ash melting point than coal slag, around 1000℃. Under high heat, it easily melts and aggregates to form coke lumps of varying sizes. Once large coke lumps are formed, they are difficult to directly convey and discharge from the furnace through the chain. Furthermore, whether it is a fixed grate or a chain grate, a large amount of air is generally blown in from under the grate. The cold air carries away the heat from the grate and plays a cooling role to prevent grate damage. However, biomass gasification requires much less air than biomass combustion (gasification is an oxygen-deficient reaction, while combustion is complete oxidation). Therefore, the grate needs to withstand more heat, and gasification grates are more prone to burnout than direct-fired grates. Summary of the Invention

[0004] This application proposes a biomass gasification furnace with steam passing under the grate, which has the advantages of reducing coke lumps and facilitating coke lumps discharge, thereby solving the problems of difficult coke lumps discharge and easy grate burn-out mentioned in the background art.

[0005] To achieve the above objectives, this application adopts the following technical solution: a biomass gasification furnace with steam passing under the grate, comprising a gasification furnace body, a feeding chamber for feeding material to the top of the chain grate on one side of the gasification furnace body, and the chain grate being driven to rotate by a drive assembly, a steam assembly on the outer side of the gasification furnace body, the steam assembly including a steam pipe for introducing steam, a branch pipe extending into the gasification furnace body being movably sleeved at equal intervals on the outer side of the steam pipe, and the two ends of the branch pipe being connected to the inner wall of the gasification furnace body, steam distribution holes for direct steam discharge being axially and equidistantly connected on the outer side of the branch pipe, a valve for controlling the opening and closing of each branch pipe being connected on the outer side of the branch pipe, a stop plate being connected to the two ends of the top of the branch pipe respectively, the branch pipe being sealed to the steam pipe, and the axial position between the branch pipe and the steam pipe remaining unchanged, and when the side of the stop plate is abutted, the branch pipe rotating circumferentially around the end of the steam pipe.

[0006] Furthermore, the chain grate includes a horizontally arranged fixed shaft, and fixed grates are axially spaced at equal intervals on the outer side of the fixed shaft. Movable grates are provided between the fixed grates and are sleeved on the outer side of the fixed shaft. The fixed grates and movable grates are axially inserted on the fixed shaft. The two ends of the movable grates are located at halfway points of the fixed grates. The bottom end of each movable grates in the same axial direction is connected to a movable plate. When the fixed grates and movable grates are driven to move by the drive assembly, the side of the movable plate abuts against the side of the abutment plate, causing the diversion pipe to rotate.

[0007] Furthermore, each of the diversion pipes has a sliding groove on both sides located on the inner wall of the gasifier body. Two rollers are tumblingly connected to the inner side of each of the two sliding grooves, and a fixed rod is connected between the four rollers. A fixed column is connected to the end of the fixed rod near the abutment plate, and the outer side of the fixed column rolls on the inner side of the abutment plate.

[0008] Furthermore, the chute is a straight chute, and the end of the chute closer to the moving direction of the movable plate is higher than the other end. As the movable plate continues to move against the side of the abutment plate, the roller is moved by the abutment plate and drives the fixed rod to slide to the top of the chute. When the fixed post is at the top position inside the abutment plate, the top end of the abutment plate contacts the bottom end of the movable plate, so that the movable plate directly passes over the top of the abutment plate in subsequent movements, and the abutment plate and the movable plate no longer have the abutting effect.

[0009] Furthermore, the fixed rod is rectangular in shape. When the four rollers at both ends of the fixed rod slide inside the groove, the top surface of the fixed rod is always flush with the horizontal plane, and the top plane of the fixed rod abuts against the bottom plane of the movable plate, pushing the movable plate to move the movable grate upward relative to the fixed grate.

[0010] Furthermore, the fixed grate and the movable grate are respectively connected to two fixed shafts on both sides, and the holes on both sides of the movable grate that connect to the outside of the fixed shafts are waist-shaped holes, while the holes on both sides of the fixed grate that connect to the outside of the fixed shafts are circular holes.

[0011] Furthermore, the inner side of the abutment is connected to a slider located above the fixed column, and the outer side of the slider is connected to a connecting rod. A fixed plate is provided below the diversion pipe. The inner side of the fixed plate is vertically slidably connected to a slide plate connected to the end of the connecting rod. A fixed head is slidably connected to the bottom inner end of the fixed plate. While the movable plate above the diversion pipe interacts with the abutment, the movable plate below the diversion pipe also interacts with the fixed head and the fixed plate.

[0012] Furthermore, the innermost end of the fixing head located inside the fixing plate will not leave the inner side of the fixing plate, and both ends of the fixing head are rounded.

[0013] Furthermore, the movable plate is shaped like an upright "L", and the end of the movable plate abuts against the side of the abutment plate. The combined shape of the fixed head and the fixed plate is also shaped like an upright "L". When the movable plate moves to the side of the fixed head, the combined shape of the fixed head and the fixed plate hooks with the shape of the movable plate.

[0014] The beneficial effect of this invention is that steam is introduced below the chain grate through steam pipes and diversion pipes. After steam is introduced below the chain grate, the steam at a temperature of several degrees Celsius creates a huge temperature difference with the environment, causing the steam to absorb a large amount of heat. This heat is carried by the rising steam to the reduction layer inside the gasifier to provide heat for the reaction. In this way, the ash and slag can be prevented from reaching a molten state, thereby preventing coking on the inner side of the gasifier. In addition, after steam is introduced below the chain grate, the steam carries away some of the heat from the chain grate, which cools the chain grate and increases its service life.

[0015] During the operation of the gasifier, the steam distribution hole is located below the chain grate. When the steam flow is low, the ventilation area of ​​the steam distribution hole is covered by fine ash falling from the gaps in the chain grate, which reduces the ventilation area of ​​the steam distribution hole. Then, through the mutual abutment between the diversion pipe and the movable plate, the movable plate pushes the abutment plate to drive the diversion pipe to rotate as a whole. The rotation of the diversion pipe causes the steam distribution hole to move, so that the ash at the top of the steam distribution hole will slide down directly from the outside of the diversion pipe due to its own gravity. This stabilizes the ventilation area of ​​the steam distribution hole and ensures the effective amount of steam entering the inside of the gasifier.

[0016] With the fixed rod in place, when the movable plate and the backing plate interact, the bottom surface of the movable plate contacts the top surface of the fixed rod. Therefore, as the roller slides inside the groove and drives the fixed rod to move, the top surface of the fixed rod directly abuts against the bottom surface of the movable plate and pushes the movable plate upward. This causes the movable plate to move the connected movable grate relative to the fixed grate, allowing the relative movement between the fixed grate and the movable grate to shake the furnace charge, making the contact between the inner side of the furnace charge and the steam more uniform and improving the effect of the steam. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0018] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0019] Figure 1 This is a front view schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a top view of the structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the chain grate structure of the present invention;

[0022] Figure 4 This is a front view schematic diagram of the fixed grate structure of the present invention;

[0023] Figure 5 This is a side view of the movable plate structure of the present invention;

[0024] Figure 6 This is a front view schematic diagram of the movable grate structure of the present invention;

[0025] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point A in the middle.

[0026] In the diagram: 1. Gasifier body; 2. Feed chamber; 3. Drive assembly; 4. Chain grate; 41. Fixed shaft; 42. Fixed grate; 43. Movable grate; 44. Movable plate; 5. Steam assembly; 51. Steam pipe; 52. Diverter pipe; 53. Steam distribution hole; 54. Backing plate; 55. Fixed plate; 56. Slide plate; 57. Fixed head; 6. Slide groove; 7. Roller; 8. Fixed rod; 9. Fixed column; 10. Sliding block; 11. Connecting rod. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example

[0028] Please see Figure 1 A biomass gasifier with steam passing under the grate includes a gasifier body 1. A feeding chamber 2 is provided on one side of the gasifier body 1 for feeding material to the top of the chain grate 4. The chain grate 4 is driven to rotate by a drive assembly 3. A steam assembly 5 is provided on the outside of the gasifier body 1. Steam is introduced into the lower part of the chain grate 4 through the steam assembly 5. The steam at more than 100 degrees Celsius has a huge temperature difference with the environment. The steam will absorb a large amount of heat from the surrounding area. This heat will be carried to the reduction layer inside the gasifier body 1 with the rising steam, providing reaction heat inside the gasifier body 1. This can prevent the ash slag from reaching a melting state, thereby preventing coking inside the gasifier body 1.

[0029] Please see Figure 2 and Figure 5 The steam assembly 5 includes a steam pipe 51 for introducing steam. A branch pipe 52 extending into the gasifier body 1 is equidistantly sleeved on the outer side of the steam pipe 51. Both ends of the branch pipe 52 are connected to the inner wall of the gasifier body 1. Steam distribution holes 53, directly expelling steam, are axially equidistantly connected to the outer side of the branch pipe 52. A valve controlling the on / off state of each branch pipe 52 is connected to the outer side of the branch pipe 52. A stop plate 54 is connected to both ends of the top of the branch pipe 52. The branch pipe 52 is sealed to the steam pipe 51, and the axial position between the branch pipe 52 and the steam pipe 51 remains unchanged. When the side of the stop plate 54 is abutted, the branch pipe 52 rotates circumferentially around the end of the steam pipe 51. After steam is introduced under the chain grate 4, the gasification method changes from simple air gasification to composite gasification. In addition to the air gasification reaction, when the steam reaches the reduction layer inside the gasifier body 1, the following reaction will occur:

[0030]

[0031] Biomass fuel, primarily composed of agricultural and forestry waste, generates hydrogen (H2), carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), water (H2O), and heat (Q) through the above reactions. The hydrogen content in the generated fuel gas can be increased from 10% to 18%, and the methane content also increases. Hydrogen and methane are higher quality combustible gases than carbon monoxide, with higher calorific value and improved energy conversion rate. Furthermore, the furnace temperature can be controlled by adjusting the amount of steam added, resulting in high efficiency in temperature change within the gasification furnace body 1 and effective temperature adjustment. Example

[0032] Example 2 is based on Example 1. Please refer to Example 1. Figure 2 and Figure 3 The chain grate 4 includes a horizontally arranged fixed shaft 41, and fixed grates 42 are axially spaced at equal intervals on the outer side of the fixed shaft 41. Movable grates 43 are provided between the fixed grates 42 and sleeved on the outer side of the fixed shaft 41. The fixed grates 42 and the movable grates 43 are axially inserted into each other on the fixed shaft 41. The two ends of the movable grates 43 are located at half the length of the fixed grates 42. A movable plate 44 is connected to the bottom end of each movable grate 43 along the same axial direction. When the fixed grates 42 and the movable grates 43 are driven to move by the drive assembly 3, the side of the movable plate 44 abuts against the side of the abutment plate 54. The diversion pipe 52 is rotated, and the area directly above the abutment plate 54 is the non-fuel reaction zone. The steam flows from the steam distribution hole 53 to the upper part of the gasifier body 1. As the movable plate 44 moves with the movable grate 43, the movable plate 44 can directly abut the side of the abutment plate 54, causing the abutment plate 54 to drive the diversion pipe 52 to rotate. This allows the ash and slag attached to the surface of the diversion pipe 52 and the opening of the steam distribution hole 53 to slide directly down, reducing the impact of the ash and slag on the surface of the diversion pipe 52 and the end of the steam distribution hole 53 on the amount of steam output, and ensuring the effectiveness of the steam action. Example

[0033] Example 3 is based on Example 2; please refer to Example 2. Figure 4 Each branch pipe 52 has a sliding groove 6 on both sides located on the inner wall of the gasifier body 1. Two rollers 7 are tumblingly connected to the inner sides of each sliding groove 6, and a fixed rod 8 connects the four rollers 7. (Refer to...) Figure 6 and Figure 7 The fixed rod 8 is connected to a fixed post 9 near the end of the abutment plate 54. The outer side of the fixed post 9 rolls inside the abutment plate 54. As the movable plate 44 pushes the abutment plate 54 to move, the abutment plate 54 will drive the fixed rod 8, causing the fixed rod 8 to slide inside the slide groove 6 via the roller 7 until the roller 7 connected to the fixed rod 8 moves into the interior of the slide groove 6. At this time, the end of the movable plate 44 contacts the end of the abutment plate 54, causing the movable plate 44 to pass through the end of the abutment plate 54 and release the abutment plate 54 that was abutted, so that the abutment plate 54 returns to its initial state and performs the function of being abutted by the movable plate 44 again.

[0034] Please see Figure 4The slide 6 is a straight slide 6, and the end of the slide 6 closest to the moving direction of the movable plate 44 is higher than the other end. As the movable plate 44 continues to move against the side of the abutment plate 54, the roller 7 is moved by the abutment plate 54, causing the fixed rod 8 to slide to the top of the slide 6. When the fixed post 9 is at the top position inside the abutment plate 54, the top end of the abutment plate 54 contacts the bottom end of the movable plate 44. This allows the movable plate 44 to directly pass over the top of the abutment plate 54 during subsequent movement, eliminating the abutment plate 54 and the movable plate 44 from their opposing positions. Due to the shape of the slide 6, the fixed rod 8 slides along the inside of the slide 6 via the roller 7. It will move diagonally upwards, thereby exerting an upward force on the movable plate 44 through the combined action of the fixed rod 8 and the abutment plate 54. This allows the movable plate 44 to push the connected movable grate 43 to move relative to the fixed grate 42. In turn, the relative movement of the fixed grate 42 and the movable grate 43 pushes the furnace charge at the top of the fixed grate 42 and the movable grate 43, breaking up the coke lumps that form near the surfaces of the fixed grate 42 and the movable grate 43 and reducing their volume. At the same time, the movement of the fixed grate 42 and the movable grate 43 agitates the furnace charge, making the contact between the interior of the furnace charge and the steam more uniform and improving the effectiveness of the steam action.

[0035] Please see Figure 6 and Figure 7 The fixed rod 8 is rectangular in shape. When the four rollers 7 at both ends of the fixed rod 8 slide inside the slide groove 6, the top surface of the fixed rod 8 is always flush with the horizontal plane, and the top plane of the fixed rod 8 abuts against the bottom plane of the movable plate 44, pushing the movable plate 44 to move the movable grate 43 connected to it upward relative to the fixed grate 42. Through the setting of the slide groove 6 and the number of rollers 7, the fixed rod 8 will always be in a stable horizontal state on the top surface during the process of sliding inside the slide groove 6 by the rollers 7. Therefore, in the process of force action between the fixed rod 8 and the movable plate 44, it is a face-to-face action process, which helps the movable plate 44 to receive more uniform force. Thus, through the shape and horizontal plane setting of the fixed rod 8, the effect of the fixed rod 8 on the movable plate 44 is improved.

[0036] Please see Figure 3The fixed grate 42 and the movable grate 43 are connected to two fixed shafts 41 on both sides respectively. The holes connecting the two sides of the movable grate 43 to the outer side of the fixed shafts 41 are oblong holes, and the holes connecting the two sides of the fixed grate 42 to the outer side of the fixed shafts 41 are circular holes. When the outer side of the fixed shaft 41 is located at the inner top of the oblong hole of the movable grate 43 and the circular hole of the fixed grate 42, the top surface of the fixed grate 42 is flush with the top surface of the movable grate 43. This is achieved through the setting of the connection holes of the fixed grate 42 to the movable grate 43 and the fixed shafts 41 respectively. This allows the movable grate 43 to move vertically relative to the fixed axis 41. When the movable grate 43 is held against the abutment plate 54 and the fixed rod 8 by the movable plate 44, the movable plate 44 and the movable grate 43 are pushed to move upward relative to the fixed grate 42. During the movement of the fixed grate 42 and the movable grate 43, the coke formed on the top surface of the movable grate 43 and the fixed grate 42 is separated from the top surface of the fixed grate 42 and the movable grate 43, and the volume of the coke is reduced, which facilitates the discharge of coke and reduces the impact of coke on the reaction inside the furnace. Example

[0037] Example 4 is based on Example 3; please refer to Example 3. Figure 6 and Figure 7 The inner side of the abutment plate 54 is connected to a slider 10 located above the fixed column 9, and the outer side of the slider 10 is connected to a connecting rod 11. A fixed plate 55 is provided below the diversion pipe 52. The inner side of the fixed plate 55 is vertically slidably connected to a slide plate 56 connected to the end of the connecting rod 11. The inner bottom end of the fixed plate 55 is slidably connected to a fixed head 57. While the movable plate 44 located above the diversion pipe 52 interacts with the abutment plate 54, the movable plate 44 located below the diversion pipe 52 also interacts with the fixed head 57 and the fixed plate 55. When the movable grate 43 and the fixed grate 42 move to the bottom of the diversion pipe 52, the movable grate 43 will move downward directly relative to the fixed grate 42 due to its own gravity. This allows the chain grate 4 to perform the ash removal process during the end ash removal process through the relative movement of the fixed grate 42 and the movable grate 43.

[0038] Please see Figure 4 and Figure 6The innermost end of the fixed head 57 located inside the fixed plate 55 will not leave the inner side of the fixed plate 55, and both ends of the fixed head 57 are rounded. The movable plate 44 is shaped like an upright "L", and the end of the movable plate 44 will abut against the side of the abutment plate 54. The combined shape of the fixed head 57 and the fixed plate 55 is an upright "L". When the movable plate 44 moves to the side of the fixed head 57, the combined shape of the fixed head 57 and the fixed plate 55 hooks with the shape of the movable plate 44. Through the setting of the fixed head 57 and the movable plate 44, after the fixed head 57 and the movable plate 44 interact to lift the movable grate 43, the movable plate 44 and the abutment plate 54 above the diversion pipe 52 also interact synchronously, causing the fixed rod 8 above the diversion pipe 52 to drive the fixed column 9 to move to the abutment plate 54. When the inner top is reached, the slider 10 above the fixed column 9 is pushed and pulls the connecting rod 11, causing the sliding plate 56 on the inner side of the fixed plate 55 to be pulled by the connecting rod 11, causing the sliding plate 56 to leave the end of the fixed head 57. Due to the rounded corner of the fixed head 57, the rounded corner between the fixed head 57 and the end of the movable plate 44 interacts and slides, causing the fixed head 57 to retract into the inner side of the fixed plate 55, causing the fixed head 57 to release the lifted movable plate 44, causing the movable plate 44 to drive the movable grate 43 to move downward again, allowing the movable grate 43 and the fixed grate 42 to move relative to each other again. After the movable plate 44 and the movable grate 43 are released, they vibrate, causing the ash and slag attached to the surfaces of the movable grate 43 and the fixed grate 42 to fall off, reducing the adhesion on the surfaces of the movable grate 43 and the fixed grate 42.

[0039] The method of using (working principle) of this invention is as follows:

[0040] During normal operation of the gasifier, the amount of steam introduced is controlled by the valve connected to the diversion pipe 52. When the temperature inside the gasifier is high, the amount of steam is increased, and when the temperature inside the gasifier is low, the amount of steam is reduced.

[0041] When the gasifier is operating normally, the material enters the upper part of the chain grate 4 through the feed chamber 2. The drive component 3 drives the chain grate 4 to transport biomass fuel, so that the biomass fuel gradually moves to the middle of the gasifier body 1 and then to the end of the chain grate 4 inside the gasifier body 1. When the ash at the top of the chain grate 4 moves to the top horizontal end, the ash will fall directly at the end by its own gravity. The chain grate 4 will continue to rotate and reach the part above the diversion pipe 52 again to transport the furnace charge and allow the furnace charge to carry out the reaction process.

[0042] During the overall movement of the chain grate 4, the fixed grate 42 and the movable grate 43 move synchronously. When the movable plate 44 moves to the side of the abutment plate 54 and abuts against the abutment plate 54, the top surface of the fixed rod 8 connected to the abutment plate 54 also abuts against the bottom end of the movable plate 44, causing the side of the movable plate 44 to directly push the abutment plate 54 to move, causing the abutment plate 54 to rotate around the axis of the diverter pipe 52. At the same time, the movement of the abutment plate 54 will drive the roller 7 connected to the fixed rod 8 to slide inside the slide groove 6, causing the fixed rod 8 to move upward along the channel of the slide groove 6. As the fixed rod 8 moves, its top surface abuts against the movable plate 44, causing the movable grate 43 to be abutted by the movable plate 44. While moving laterally, the plate 44 moves upward relative to the fixed grate 42, breaking up the coke formed at the top of the fixed grate 42 and the movable grate 43, reducing the volume of coke on the top surface. Simultaneously, the movable plate 44 above the diversion pipe 52 moves, and the movable plate 44 below the diversion pipe 52 moves synchronously, so that the upper movable plate 44 contacts the abutment plate 54 while the lower movable plate 44 contacts the side of the fixed head 57, causing the shape of the movable plate 44 to abut against the bottom end of the fixed head 57. As the fixed plate 55 and the fixed head 57 rotate relative to the diversion pipe 52, the end of the fixed head 57 moves upward relative to the movable plate 44, allowing the end of the fixed head 57 to directly pass through... The movable grate 43 connected below is lifted by the movable plate 44, causing the movable grate 43 to move upward relative to the fixed grate 42. However, when the movable plate 44 moves below the diversion pipe 52, the movable grate 43 connected to the movable plate 44 will move relative to the fixed grate 42 due to its own gravity, making the horizontal height of the movable grate 43 below the diversion pipe 52 lower than that of the fixed grate 42. Thus, the movable plate 44 is lifted by the fixed head 57, causing the movable grate 43 and the fixed grate 42 to move relative to each other again, causing the ash and slag attached to the surfaces of the movable grate 43 and the fixed grate 42 to fall off, and the fixed rod 8 above the diversion pipe 52 moves to the top of the chute 6. When in position, the fixed column 9 connected to the fixed rod 8 will push the slider 10 to drive the connecting rod 11 to directly pull the slide plate 56, causing the slide plate 56 to move upward inside the fixed plate 55. This causes the rounded corner at the end of the fixed head 57 to slide relative to the movable plate 44, releasing the movable plate 44. This allows the movable grate 43 connected to the movable plate 44 to move downward relative to the fixed grate 42 again. The gravity of the movable grate 43 causes vibration between the fixed grate 42 and the movable grate 43, strengthening the cleaning intensity of ash and slag on the surfaces of the fixed grate 42 and the movable grate 43. This facilitates the fixed grate 42 and the movable grate 43 to move above the diversion pipe 52 again for the process of conveying furnace charge.

Claims

1. A biomass gasifier with steam passing under a grate, comprising a gasifier body (1), wherein a feed chamber (2) for feeding material onto the top of a chain grate (4) is provided on one side of the gasifier body (1), and the chain grate (4) is driven to rotate by a drive assembly (3), characterized in that, A steam assembly (5) is provided on the outside of the gasifier body (1); The steam assembly (5) includes a steam pipe (51) for introducing steam. A branch pipe (52) extending into the gasifier body (1) is equidistantly sleeved on the outer side of the steam pipe (51). The two ends of the branch pipe (52) are connected to the inner wall of the gasifier body (1). A steam distribution hole (53) for direct steam discharge is axially equidistantly connected on the outer side of the branch pipe (52). A valve for controlling the opening and closing of each branch pipe (52) is connected on the outer side of the branch pipe (52). A stop plate (54) is connected to both ends of the top of the branch pipe (52). The diverter (52) is sealed to the steam pipe (51), and the axial position between the diverter (52) and the steam pipe (51) remains unchanged. When the side of the abutment (54) is abutted, the diverter (52) rotates circumferentially around the end of the steam pipe (51). The chain grate (4) includes a horizontally arranged fixed shaft (41), and fixed grates (42) are axially spaced at equal intervals on the outer side of the fixed shaft (41). Movable grates (43) are provided between the fixed grates (42) and are sleeved on the outer side of the fixed shaft (41). The fixed grates (42) and the movable grates (43) are axially inserted on the fixed shaft (41). The two ends of the movable grates (43) are located at half the length of the fixed grates (42). The bottom end of each movable grates (43) in the same axial direction is connected to a movable plate (44). When the fixed grates (42) and the movable grates (43) are driven to move by the drive assembly (3), the side of the movable plate (44) abuts against the side of the abutment plate (54), causing the diversion pipe (52) to rotate. Each of the diversion pipes (52) has a sliding groove (6) on both sides located on the inner wall of the gasifier body (1). Two rollers (7) are rolled on the inner side of each of the two sliding grooves (6), and a fixed rod (8) is connected between the four rollers (7). A fixed column (9) is connected to the end of the fixed rod (8) near the abutment plate (54), and the outer side of the fixed column (9) rolls on the inner side of the abutment plate (54). The chute (6) is a straight chute, and the end of the chute (6) near the moving direction of the movable plate (44) is higher than the other end. The movable plate (44) continues to move against the side of the abutment plate (54) until the roller (7) is moved by the abutment plate (54) and drives the fixed rod (8) to slide to the top of the chute (6). When the fixed column (9) is at the top position inside the abutment plate (54), the top end of the abutment plate (54) contacts the bottom end of the movable plate (44), so that the movable plate (44) passes directly over the top of the abutment plate (54) in the subsequent continued movement, so that the abutment plate (54) and the movable plate (44) no longer have the abutment function. The fixed rod (8) is rectangular in shape. When the four rollers (7) at both ends of the fixed rod (8) slide inside the groove (6), the top surface of the fixed rod (8) is always flush with the horizontal plane. The top plane of the fixed rod (8) and the bottom plane of the movable plate (44) abut against each other, pushing the movable plate (44) to drive the movable grate (43) connected to it to move upward relative to the fixed grate (42).

2. A biomass gasification furnace with steam passing under the grate according to claim 1, characterized in that, The fixed grate (42) and the movable grate (43) are connected to two fixed shafts (41) on both sides respectively. The holes on both sides of the movable grate (43) connected to the outside of the fixed shaft (41) are waist-shaped holes, and the holes on both sides of the fixed grate (42) connected to the outside of the fixed shaft (41) are circular holes.

3. A biomass gasification furnace with steam passing under the grate according to claim 1, characterized in that, The inner side of the abutment plate (54) is connected to a slider (10) located above the fixed column (9), and the outer side of the slider (10) is connected to a connecting rod (11). A fixed plate (55) is provided below the diversion pipe (52). The inner side of the fixed plate (55) is vertically slidably connected to a slide plate (56) connected to the end of the connecting rod (11). The bottom inner end of the fixed plate (55) is slidably connected to a fixed head (57). While the movable plate (44) located above the diversion pipe (52) interacts with the abutment plate (54), the movable plate (44) located below the diversion pipe (52) also interacts with the fixed head (57) and the fixed plate (55).

4. A biomass gasification furnace with steam passing under the grate according to claim 3, characterized in that, The innermost end of the fixing head (57) located inside the fixing plate (55) will not leave the inner side of the fixing plate (55), and both ends of the fixing head (57) are rounded.

5. A biomass gasification furnace with steam passing under the grate according to claim 3, characterized in that, The movable plate (44) is shaped like an upright "L" and the end of the movable plate (44) abuts against the side of the abutment plate (54). The combined shape of the fixed head (57) and the fixed plate (55) is shaped like an upright "L". When the movable plate (44) moves to the side of the fixed head (57), the combined shape of the fixed head (57) and the fixed plate (55) hooks with the shape of the movable plate (44).

Images