CN215570415U - Water-cooled reciprocating grate biomass gasification burner - Google Patents

Abstract

The utility model provides a reciprocating grate biomass gasification burner which comprises a combustion chamber, a spiral-flow type combustion head, a reciprocating grate water cooling device, a blanking assembly and a cooling heat exchange device, wherein the spiral-flow type combustion head is arranged on the combustion chamber; the spiral-flow type burner is communicated with the combustion chamber; the reciprocating grate water cooling device comprises a reciprocating grate frame; a static fire grate segment steel frame is arranged on the reciprocating fire grate frame; a movable grate segment steel frame is arranged on the reciprocating grate frame; the static fire grate pieces are arranged on the static fire grate piece steel frame; the movable fire grate segment steel frame is provided with a movable fire grate segment; a connecting pipeline is arranged between the static fire grate segment steel frames; the two ends of the connecting pipeline are respectively provided with a water inlet joint and a water outlet joint; the cooling conversion device comprises a cold-heat converter and a tertiary air fan, and the cold-heat converter is connected with the water inlet joint and the water outlet joint through water pipes; the cold-hot converter is connected with the air duct through an air pipe; the cold-hot converter is connected with the blanking assembly through a second air pipe; the tertiary fan is arranged on the second air pipe, so that the safety and the reliability are improved, and the energy is saved by the cooling heat exchange device.

Description

Water-cooled reciprocating grate biomass gasification burner

Technical Field

The utility model provides a combustor, and particularly relates to a water-cooled reciprocating grate biomass gasification combustor.

Background

At present, in partial areas of China, due to the fact that the cost of clean energy such as natural gas, electricity and the like is high, the use of biomass fuels such as biomass particles, wood leftover materials, straws, building templates and the like is gradually increased, the conventional reciprocating grate biomass combustion mode is poor in sealing effect, high in air leakage coefficient, non-centralized in heat, easy to damage a grate, insufficient in combustion, difficult in slag discharging, not up to standard in discharge, and easy to cause the problems of low heat efficiency, environmental pollution and the like. This technique provides a water-cooled reciprocating grate biomass gasification combustor, has solved biomass fuel burning inadequately, the thermal efficiency is low, environmental pollution scheduling problem, has reduced the air leakage coefficient, has reduced pollution emission, has prolonged grate life, has realized that the heat of combustion concentrates and concentrates clean slag scheduling problem, cooperates the negative pressure burning simultaneously, and the explosion vent that sets up has improved the security and the reliability of equipment greatly, and cooling heat transfer device has saved the energy greatly.

SUMMERY OF THE UTILITY MODEL

The water-cooled reciprocating grate biomass gasification burner provided by the utility model has the advantages of simple structure and convenience in use, solves the problems of insufficient combustion of biomass fuel, low thermal efficiency, environmental pollution and the like, reduces the air leakage coefficient, reduces pollution discharge, prolongs the service life of the grate, realizes the problems of concentrated combustion heat, concentrated clean slag discharge and the like, and is matched with a negative pressure combustion and an explosion door arranged on the water-cooled reciprocating grate biomass gasification burner, so that the safety and reliability of equipment are greatly improved, and the energy is greatly saved by a cooling heat exchange device.

The utility model provides a water-cooled reciprocating grate biomass gasification burner which comprises a combustion chamber, a spiral-flow type combustion head, a water-cooled reciprocating grate arranged in the combustion chamber, a blanking assembly, a cooling conversion device and a spiral slag leveling machine.

The cooling conversion device is respectively connected with the combustion chamber, the spiral-flow type combustion head, the blanking assembly and the water-cooled reciprocating grate through connecting pipes; a retaining wall is fixedly connected to the upper end face of the inner part of the combustion chamber; a supporting ventilation beam is arranged on the lower end face of the retaining wall; a plurality of air pipes are uniformly and mutually arranged on the supporting ventilation beam; the combustion chamber is divided into a gasification zone and a combustion zone by a retaining wall; the combustion chamber is fixedly connected with the retaining wall.

The swirl burner head includes a centralized chamber; an intermediate cylinder is sleeved on the outer end face of the concentration cavity; the outer cylinder is sleeved on the outer end face of the middle cylinder; the end of the inner centralized cavity of the outer cylinder is communicated with an inner cylinder; the surface of the inner cylinder in the outer cylinder is sleeved with a sleeve; the surface of the sleeve is sleeved with an L-shaped annular plate fixedly connected with the concentration cavity, the inner wall of the outer cylinder and the middle cylinder; a flange plate is arranged at the end head of the outer barrel; the outer cylinder, the L-shaped annular plate, the concentration cavity, the sleeve and the flange plate form a cyclone chamber in a surrounding mode; the cyclone chamber is communicated and connected with the inner cylinder through a cyclone pipe; the cyclone chamber is communicated with the concentration cavity through a second cyclone plate; the outer barrel, the middle barrel and the L-shaped annular plate enclose a second cyclone chamber; a rotational flow frame is arranged between the outer barrel and the middle barrel; a rotational flow plate is arranged on the rotational flow frame; the outer cylinder is communicated with an air duct; the air duct is divided into a first air duct and a second air duct by a partition plate; the first air channel is communicated with the second cyclone chamber; the second air duct is communicated with the cyclone chamber; the outer cylinder is communicated with the combustion area.

The water-cooled reciprocating grate comprises a reciprocating grate frame; a plurality of static grate segment steel frames are arranged on the reciprocating grate frame; a movable grate segment steel frame is arranged on the reciprocating grate frame and between the static grate segment steel frames; the static fire grate sheet steel frame is provided with static fire grate sheets; the movable fire grate pieces are arranged on the movable fire grate piece steel frames; a connecting pipeline is arranged between the static fire grate segment steel frames; the two ends of the connecting pipeline extending out of the static fire grate segment steel frame are respectively provided with a water inlet joint and a water outlet joint; the cooling conversion device comprises a cold-heat converter and a tertiary air fan; the cold-hot converter is respectively connected with the water inlet joint and the water outlet joint through water pipes; the cold-hot converter is connected with the air duct through an air pipe; the cold-hot converter is connected with the blanking assembly through a second air pipe; the tertiary air fan is arranged on the second air pipe.

The blanking assembly comprises a baffling blanking pipe communicated and connected with the gasification area; the upper end surface of the baffling blanking pipe is communicated and connected with a sealed double-switch valve box body; the upper end surface of the sealed double-switch valve box body is communicated and connected with a hopper; the upper end surface of the hopper is provided with a dust hood; an explosion-proof door is arranged on the surface of the baffling discharging pipe; and the surface of the sealed double-switch valve box body is provided with a rotation-resistant material level meter and a sealed double-switch valve.

An ignition port and a temperature measuring device are arranged at the gasification region on the combustion chamber; a negative pressure detection device and a denitration device in the furnace are arranged at the upper combustion area of the combustion chamber; the outer cylinder is communicated with a combustion area at the combustion chamber through a flange plate; the end of the second air pipe far away from the tertiary air fan is arranged in the gasification area.

The water-cooled reciprocating grate provides power through a grate power system arranged on the outer end surface of the combustion chamber; an air box is arranged in the combustion chamber and at the lower end of the water-cooled reciprocating grate; the supporting ventilation beam is connected with the bellows through an air pipe.

A spiral slag leveling machine is arranged at the tail end of the water-cooled reciprocating grate in the combustion chamber; and a second explosion-proof door is arranged at the tail part of the water-cooled reciprocating grate on the combustion chamber.

The end of the outer barrel, which is far away from the air duct, is fixedly connected with an air shrinkage pipe; a plurality of swirl pipes are uniformly arranged; and regulating valves are respectively arranged in the first air channel and the second air channel.

Connecting pipelines between the static fire grate segment steel frames form a series loop; the static fire grate segment steel frame is tightly connected with the static fire grate segments through the buckles.

The utility model has the beneficial effects that: when biomass fuel enters a gasification zone of a combustion chamber through a blanking assembly, partial combustible gas is separated out through high-temperature cracking, the combustible gas and solid fuel are continuously supplied with air through an air blower and conveyed through a reciprocating grate, the combustible gas and the solid fuel are combusted in the combustion zone, secondary air and tertiary air provided by a supporting ventilation beam arranged in the combustion chamber and a spiral-flow type combustion head arranged at the front end of the combustion chamber ensure the sufficient combustion of the fuel, so that the heat is fully released, a spiral water-cooled type slag leveling machine arranged at the tail part of the reciprocating grate finally intensively discharges ash slag, the sealing measure of the whole set of device reduces the air leakage coefficient, avoids the problems of incomplete combustion, insufficient combustion, high fuel consumption and the like, realizes negative pressure combustion by matching with an induced draft fan, and is provided with safe and environment-friendly measures such as a grate cooling heat exchanger, a grate water-cooling circulating device, an explosion door, a denitration device in the furnace and the like, the safety and the reliability of the equipment and the low nitrogen emission of the flue gas are ensured.

Drawings

FIG. 1 is a cross-sectional view of a water-cooled reciprocating grate biomass gasification burner of the present invention.

FIG. 2 is a cross-sectional view of a water-cooled reciprocating grate biomass gasification burner of the present invention.

FIG. 3 is a structural diagram of a water-cooled reciprocating grate biomass gasification burner of the present invention.

FIG. 4 is another structural diagram of the water-cooled reciprocating grate biomass gasification burner of the present invention.

(1, a centralized cavity; 2, a middle barrel; 3, an outer barrel; 4, an inner barrel; 5, a sleeve; 6, an L-shaped annular plate; 7, a flange plate; 8, a cyclone chamber; 9, a second cyclone plate; 10, a second cyclone chamber; 11, a cyclone pipe; 12, a cyclone plate; 13, an air duct; 14, a partition board; 15, a first air duct; 16, a second air duct; 17, a reciprocating grate frame; 18, a static grate steel frame; 19, a dynamic grate steel frame; 20, a static grate sheet; 21, a dynamic grate sheet; 22, a connecting pipe; 23, a water inlet joint; 24, a water outlet joint; 25, a cooling conversion device; 26, a tertiary air fan; 27, a regulating valve; 28, an air pipe; 29, a second air pipe; 30, a combustion chamber; 31, a reciprocating water-cooled grate; 32, a cyclone burner head; 33, a blanking assembly; 34, a baffling blanking pipe; 35, a double-switch valve box body; 36, a hopper; 37, 37, A dust hood; 38. an explosion vent; 39. a rotation-resisting level indicator; 40. a sealed double-switch valve; 41. retaining walls; 42. supporting the ventilation beam; 43. a wind pipe; 44. a gasification zone; 45. a combustion zone; 46. an ignition port; 47. a temperature measuring device; 48. A negative pressure detection device; 49. a denitration device in the furnace; 50. a fire grate power system 51 and a spiral slag discharging machine; 52. a second explosion vent; 53. an air box; 54. tuber pipe)

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

According to the fig. 1, 2, 3 and 4, the water-cooled reciprocating grate biomass gasification burner comprises a combustion chamber 30, a spiral-flow type burner head 32, a water-cooled reciprocating grate 31 arranged in the combustion chamber 30, a blanking assembly 33, a cooling conversion device 25 and a spiral slag leveling machine 51; the cooling conversion device 25 is respectively connected with the combustion chamber 30, the spiral-flow type combustion head 32, the blanking assembly 33 and the water-cooled reciprocating grate 31 through connecting pipes; a retaining wall 41 is fixedly connected to the upper end surface inside the combustion chamber 30; a supporting ventilation beam 42 is arranged on the lower end face of the retaining wall 41; a plurality of air pipes 54 are uniformly and mutually arranged on the supporting ventilation beam 42; the combustion chamber 30 is internally divided into a gasification zone 44 and a combustion zone 45 by a retaining wall 41; the combustion chamber 30 is fixedly connected with a retaining wall 41; the cyclone burner head 32 comprises a concentration chamber 1; the outer end face of the concentration cavity 1 is sleeved with a middle cylinder 2; the outer end face of the middle barrel 2 is sleeved with an outer barrel 3; the end of the concentration cavity 1 in the outer cylinder 3 is communicated with an inner cylinder 4; the surface of an inner cylinder 4 in the outer cylinder 3 is sleeved with a sleeve 5; the surface of the sleeve 5 is sleeved with an L-shaped annular plate 6 fixedly connected with the concentration cavity 1, the inner wall of the outer cylinder 3 and the middle cylinder 2; a flange plate 7 is arranged at the end of the outer barrel 3; the outer cylinder 3, the L-shaped annular plate 6, the concentration cavity 1, the sleeve 5 and the flange plate 7 enclose a cyclone chamber 8; the cyclone chamber 8 is communicated with the inner barrel 4 through a cyclone tube 11; the cyclone chamber 8 is communicated with the concentration cavity through a second cyclone plate 9; the outer cylinder 3, the middle cylinder 2 and the L-shaped annular plate 6 enclose a second cyclone chamber 10; a rotational flow frame is arranged between the outer cylinder 3 and the middle cylinder 2; the rotational flow frame is provided with a rotational flow plate 12; the outer cylinder 3 is communicated with an air duct 13; the air duct 13 is divided into a first air duct 15 and a second air duct 16 by a partition plate 14; the first air duct 15 is communicated with the second cyclone chamber 10; the second air duct 16 is communicated with the cyclone chamber 8; the outer cylinder 3 is communicated with the combustion area 45; the water-cooled reciprocating grate 31 comprises a reciprocating grate frame 17; a plurality of static grate segment steel frames 18 are arranged on the reciprocating grate frame 17; a movable grate segment steel frame 19 is arranged on the reciprocating grate frame 17 and between the static grate segment steel frames 18; the static fire grate segment steel frame 18 is provided with static fire grate segments 20; the movable fire grate segments 21 are arranged on the movable fire grate segment steel frames 19; a connecting pipeline 22 is arranged between the static fire grate segment steel frames 18; the two ends of the connecting pipeline 22 extending out of the static fire grate segment steel frame 18 are respectively provided with a water inlet joint 23 and a water outlet joint 24; the cooling conversion device 25 comprises a cold-heat converter and a tertiary air fan 26; the cooling converter is respectively connected with a water inlet joint 23 and a water outlet joint 24 through water pipes; the cold-heat converter is connected with the air duct 13 through an air pipe 28; the cold-heat converter is connected with the blanking assembly 33 through a second air pipe 29; the tertiary air fan 26 is arranged on the second air pipe 29; the blanking assembly 33 comprises a baffling blanking pipe 34 communicated and connected with the gasification area 44; the upper end surface of the folding discharge pipe 34 is communicated and connected with a sealed double-switch valve box body 35; the upper end surface of the sealed double-switch valve box body 35 is communicated and connected with a hopper 36; a dust hood 37 is arranged on the upper end surface of the hopper 36; the surface of the bent down material pipe 34 is provided with an explosion-proof door 38; the surface of the sealed double-switch valve box body 35 is provided with a rotation-resistant level indicator 39 and a sealed double-switch valve 40; an ignition port 46 and a temperature measuring device 47 are arranged at the gasification region 44 on the combustion chamber 30; a negative pressure detection device 48 and an in-furnace denitration device 49 are arranged at the combustion area 45 on the combustion chamber 30; the outer cylinder 3 is communicated with a combustion area 45 at the combustion chamber 30 through a flange plate 7; the end of the second air pipe 29 far away from the tertiary air fan 26 is arranged in the gasification area 44; the water-cooled reciprocating grate 31 is powered by a grate power system 50 arranged on the outer end surface of the combustion chamber 30; an air box 53 is arranged in the combustion chamber 30 and at the lower end of the water-cooled reciprocating grate 31; the supporting ventilation beam 42 is connected with an air box 53 through an air pipe 54; a spiral slag leveling machine 51 is arranged at the tail end of the water-cooled reciprocating grate 31 in the combustion chamber 30; the tail part of the water-cooled reciprocating grate 31 on the combustion chamber 30 is provided with a second explosion-proof door 52; the end of the outer cylinder 3 far away from the air duct is fixedly connected with an air shrinkage pipe 43; a plurality of swirl pipes 11 are uniformly arranged; the first air duct 15 and the second air duct 16 are respectively provided with an adjusting valve 27; the connecting pipes 22 between the static fire grate segment steel frames 18 form a serial loop; the static fire grate segment steel frame 18 and the static fire grate segments 20 are tightly connected through buckles.

The principle of the utility model is as follows: the combustion of the water-cooled reciprocating grate biomass gasification combustor provided by the utility model is negative pressure combustion. Biomass fuel enters a gasification zone 44 through a blanking assembly 33, part of combustible gas is separated out through pyrolysis, air is continuously supplied through an air box 53 and conveyed through a water-cooled reciprocating grate 31, the combustible gas, solid fuel and the like are combusted in a combustion zone 45, and ash and slag are finally discharged through a spiral type slag leveling machine 51 arranged on the water-cooled reciprocating grate 31; the tertiary air fan 26 is started, the smoke in the combustion chamber 30 is absorbed through the second air pipe 29, the formed cold air enters the cold-heat converter, the cold-heat converter is respectively connected with the water inlet connector 23 and the water outlet connector 24 through water pipes, water circulates between the static fire grate segment steel frame 18 and the cold-heat converter, when the water in the static fire grate segment steel frame 18 is heated, the cold-heat converter circularly enters the cold-heat converter, the hot water of the cold-heat converter is cooled by the cold air in the cold-heat converter, the hot water circularly enters the static fire grate segment steel frame 18 for cooling, the cold air in the cold-heat converter is heated by the hot water and flows into the air duct 13, when in use, the air enters from the first air duct 15 and the second air duct 16, the air enters the second swirl chamber 10 from the first air duct 15, the swirl plate 12 is arranged in the second swirl chamber 10, the air entering the second swirl chamber 10 forms primary air through the swirl plate 12, when the primary cyclone wind passes through the air shrinkage pipe 43 on the outer cylinder 3, the wind direction central point of the primary cyclone is gathered, thereby realizing the concentration of flame, wind enters the cyclone chamber 8 through the second air duct 16, the wind entering the cyclone chamber 8 forms secondary cyclone wind through the second cyclone plate 9, the secondary cyclone wind enters the combustion area 45, and is combustion-supporting, the other part of the wind in the cyclone chamber 8 passes through the cyclone tube 11, and forms tertiary cyclone wind, and passes through the inner tube 4, and enters the combustion area 45, and is combustion-supporting, the tertiary cyclone wind is concentrated in the combustion area 45, the primary cyclone wind, the secondary cyclone wind, the cooperation of the tertiary cyclone wind, the combustion effect is guaranteed, the ash is reduced, the combustion effect of biomass fuels is greatly improved, the regulating valves 27 are respectively arranged in the first air duct 15 and the second air duct 16, the effect of respectively regulating the size of the wind power is realized, and the flame retardant coating achieves the effect of preventing heat dissipation.

Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model, and it is intended that the scope of the utility model be defined by the appended claims.

Claims (7)

1. The utility model provides a water-cooled reciprocal grate biomass gasification combustor which characterized in that: comprises a combustion chamber (30), a spiral-flow type combustion head (32), a water-cooled reciprocating grate (31) arranged in the combustion chamber (30), a blanking assembly (33), a cooling conversion device (25) and a spiral slag leveling machine (51); the cooling conversion device (25) is respectively connected with the combustion chamber (30), the spiral-flow type combustion head (32), the blanking assembly (33) and the water-cooled reciprocating grate (31) through connecting pipes; a retaining wall (41) is fixedly connected to the upper end surface inside the combustion chamber (30); a supporting ventilation beam (42) is arranged on the lower end face of the retaining wall (41); a plurality of air pipes (54) are uniformly communicated and arranged on the supporting ventilation beam (42); the combustion chamber (30) is internally divided into a gasification zone (44) and a combustion zone (45) by a retaining wall (41); the combustion chamber (30) is fixedly connected with the retaining wall (41); the cyclone burner head (32) comprises a concentration chamber (1); the outer end face of the concentration cavity (1) is sleeved with a middle cylinder (2); the outer end face of the middle barrel (2) is sleeved with an outer barrel (3); the end of the concentration cavity (1) in the outer cylinder (3) is communicated with an inner cylinder (4); the surface of the inner cylinder (4) in the outer cylinder (3) is sleeved with a sleeve (5); the surface of the sleeve (5) is sleeved with an L-shaped annular plate (6) fixedly connected with the concentration cavity (1), the inner wall of the outer cylinder (3) and the middle cylinder (2); a flange plate (7) is arranged at the end of the outer cylinder (3); the outer cylinder (3), the L-shaped annular plate (6), the concentration cavity (1), the sleeve (5) and the flange plate (7) enclose a cyclone chamber (8); the cyclone chamber (8) is communicated and connected with the inner barrel (4) through a cyclone pipe (11); the cyclone chamber (8) is communicated with the concentration cavity through a second cyclone plate (9); the outer cylinder (3), the middle cylinder (2) and the L-shaped annular plate (6) enclose a second cyclone chamber (10); a rotational flow frame is arranged between the outer cylinder (3) and the middle cylinder (2); a rotational flow plate (12) is arranged on the rotational flow frame; the outer cylinder (3) is communicated with an air duct (13); the air duct (13) is divided into a first air duct (15) and a second air duct (16) through a partition plate (14); the first air duct (15) is communicated with the second cyclone chamber (10); the second air duct (16) is communicated with the cyclone chamber (8); the outer cylinder (3) is communicated with the combustion area (45); the water-cooled reciprocating grate (31) comprises a reciprocating grate frame (17); a plurality of static grate segment steel frames (18) are arranged on the reciprocating grate frame (17); a movable fire grate segment steel frame (19) is arranged on the reciprocating fire grate frame (17) and between the static fire grate segment steel frames (18); the static fire grate segment steel frame (18) is provided with static fire grate segments (20); a movable fire grate sheet (21) is arranged on the movable fire grate sheet steel frame (19); a connecting pipeline (22) is arranged between the static fire grate segment steel frames (18); a water inlet joint (23) and a water outlet joint (24) are respectively arranged at two ends of the connecting pipeline (22) extending out of the static fire grate segment steel frame (18); the cooling conversion device (25) comprises a cold-heat converter and a tertiary air fan (26); the cold-hot converter is respectively connected with the water inlet joint (23) and the water outlet joint (24) through water pipes; the cold-heat converter is connected with the air duct (13) through an air pipe (28); the cold-heat converter is connected with the blanking assembly (33) through a second air pipe (29); the tertiary air fan (26) is arranged on the second air pipe (29).

2. The water-cooled reciprocating grate biomass gasification burner of claim 1, characterized in that: the blanking assembly (33) comprises a bent blanking pipe (34) communicated and connected with the gasification zone (44); the upper end surface of the folding discharge pipe (34) is communicated and connected with a sealed double-switch valve box body (35); the upper end surface of the sealed double-switch valve box body (35) is communicated and connected with a hopper (36); a dust hood (37) is arranged on the upper end surface of the hopper (36); an explosion-proof door (38) is arranged on the surface of the bent down material pipe (34); the surface of the sealed double-switch valve box body (35) is provided with a rotation-resistant level indicator (39) and a sealed double-switch valve (40).

3. The water-cooled reciprocating grate biomass gasification burner of claim 1, characterized in that: an ignition port (46) and a temperature measuring device (47) are arranged at a gasification region (44) on the combustion chamber (30); a negative pressure detection device (48) and an in-furnace denitration device (49) are arranged at a combustion area (45) on the combustion chamber (30); the outer cylinder (3) is communicated with a combustion area (45) at the combustion chamber (30) through a flange plate (7); the end of the second air pipe (29) far away from the tertiary air fan (26) is arranged in the gasification area (44).

4. The water-cooled reciprocating grate biomass gasification burner of claim 1, characterized in that: the water-cooled reciprocating grate (31) provides power through a grate power system (50) arranged on the outer end surface of the combustion chamber (30); an air box (53) is arranged at the lower end of the water-cooled reciprocating grate (31) in the combustion chamber (30); the supporting ventilation beam (42) is connected with the air box (53) through an air pipe (54).

5. The water-cooled reciprocating grate biomass gasification burner of claim 1, characterized in that: a spiral slag leveling machine (51) is arranged at the tail end of the water-cooled reciprocating grate (31) in the combustion chamber (30); and a second explosion-proof door (52) is arranged at the tail part of the water-cooled reciprocating grate (31) on the combustion chamber (30).

6. The water-cooled reciprocating grate biomass gasification burner of claim 1, characterized in that: the end of the outer cylinder (3) far away from the air duct is fixedly connected with an air shrinkage pipe (43); a plurality of swirl pipes (11) are uniformly arranged; and regulating valves (27) are respectively arranged in the first air duct (15) and the second air duct (16).

7. The water-cooled reciprocating grate biomass gasification burner of claim 1, characterized in that: the connecting pipelines (22) between the static fire grate segment steel frames (18) form a serial loop; the static fire grate segment steel frame (18) and the static fire grate segments (20) are tightly connected through buckles.

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