JP4104078B2 - Pre-grate and stoker furnace - Google Patents

Description

  The present invention relates to a stoker furnace used for incineration of waste and the like, and a pre-grate of the stoker furnace.

  2. Description of the Related Art Conventionally, incinerators are known for incineration of municipal waste from general households or industrial waste generated in connection with business activities to reduce the volume, reduce the amount, stabilize it, and make it harmless.

  Incinerator types include stoker furnaces, rotary kiln furnaces, fluidized furnaces, multistage furnaces, fixed furnaces, and waste liquid furnaces.

  Patent document 1 is disclosing the conventional stoker type waste combustion furnace.

  A stoker furnace incinerates an incinerator while flowing down an inclined grate from the top, and the grate is generally a staircase and each stage slides back and forth. Widely used for municipal waste incineration, the collected material can be supplied directly without pretreatment such as crushing.

  FIG. 4 shows a conventional stoker furnace. The stalker furnace includes a furnace wall 106 and a stalker 120 in which a moving grate 111 and a fixed grate 112 are alternately arranged. The furnace wall 106 is arrange | positioned at the incinerated material supply part side in a combustion part. The furnace wall surface 106a of the furnace wall 106 faces the incineration ash discharge part side. The moving grate 111 is attached to the drive base 110. When a driving device (not shown) reciprocates the driving table 110, the moving grate 111 reciprocates along the back surface 112 a of the fixed grate 112. The incinerated product supplied onto the stoker 120 from above is dried and burned while being conveyed from the incinerated product supply unit side to the incinerated ash discharge unit side by the stoker 120. At this time, the incinerated product is stirred and mixed by a stoker.

  The stoker furnace shown in FIG. 4 includes a pre-grate 108 between the furnace wall 106 and a moving grate 111 disposed below the furnace wall 106. The front grate 108 is attached to a front grate support 107 fixed to the lower part of the furnace wall 106 via a shaft 107a. The pre-grating 108 can swing up and down around the shaft portion 107a.

  A plan view of the pre-grate 108 is shown in FIG. The pre-grate 108 includes a plate-like member 183 that prevents the incinerated material from leaking from the inside of the combustion section through between the furnace wall 106 and the moving grate 111, and arm-like members 181 and 182. At the bases of the arm-shaped members 181 and 182, attachment portions 181 a and 182 a for attaching the front grate 108 to the front grate support 107 are provided. The plate-like member 183 is fixed to the ends of the arm-like members 181 and 182. The pre-grating 108 further includes a plate-like reinforcing member 184. The reinforcing member 184 is fixed to the upper side of the arm-shaped members 181 and 182.

  Here, the foreign matter that has entered the gap between the furnace wall 106 and the front grate 108 accumulates between the furnace wall 106 and the reinforcing member 184. If the foreign material accumulated by the pre-grate 108 is bitten, the stalker may stop.

It is necessary to prevent biting by the pre-grate.
JP-A-11-173526

  An object of the present invention is to provide a pre-grate and a stoker furnace in which foreign object biting is prevented.

  Hereinafter, means for solving the problem will be described using the numbers used in (Best Mode for Carrying Out the Invention). These numbers are added to clarify the correspondence between the description of (Claims) and (Best Mode for Carrying Out the Invention). However, these numbers should not be used to interpret the technical scope of the invention described in (Claims).

  The front grate (8) according to the present invention includes a plate member (83), a first arm member (81) fixed to the plate member, and a second arm fixed to the plate member. A first member (82), a first rib (85) provided along the longitudinal direction of the first arm-shaped member and fixed to the first arm-shaped member, and a longitudinal direction of the second arm-shaped member And a second rib (86) fixed to the second arm-shaped member. Here, the first arm-shaped member and the second arm-shaped member are opposed to each other with an interval so that their longitudinal directions are parallel to each other. An interval is provided between the first rib and the second rib.

  Furthermore, the pre-grating (8) according to the present invention includes a third rib (87) provided along the longitudinal direction of the plate-like member and fixed to the plate-like member.

  In addition, the stoker furnace according to the present invention includes a combustion section (19) for burning incinerated products, an incinerated product supply section (21) for supplying the incinerated products to the combustion section from the incinerated product supply port (22), and the combustion section. An incineration ash discharge section (18) for discharging the incineration ash from the furnace, a stoker (20) disposed at the bottom of the combustion section, a furnace wall (6) disposed below the incineration supply port, and A moving grate (11) disposed under the furnace wall and constituting a part of the stoker; and a pre-grating (8) provided between the furnace wall and the moving grate. ing.

  ADVANTAGE OF THE INVENTION According to this invention, the front grate and stoker furnace which a foreign material bite is prevented are provided.

  With reference to the accompanying drawings, the best mode for carrying out a pre-grate and a stoker furnace according to the present invention will be described below.

  A stoker furnace according to an embodiment of the present invention is shown in FIG. The stoker furnace includes a combustion unit 19 that burns incineration materials such as garbage, an incineration material supply unit 21 that supplies incineration material into the combustion unit 19, and an incineration ash discharge unit 18 that discharges incineration ash from the combustion unit 19. It has.

  The incinerated product supply unit 21 includes a hopper 1, a chute 2, a feeder 3, a feeder driving device 4, and a feed table 5. The incinerated material thrown into the hopper 1 falls in the chute 2 by its own weight and reaches the feed table 5. The incinerated product is intermittently supplied from the incinerated product supply port 22 onto the stoker 20 in the combustion unit 19 by the feeder 3 reciprocated by the feeder driving device 4 such as a hydraulic cylinder.

  The combustion unit 19 includes a furnace wall 6, which is a castable refractory structure, a front grate support unit 7, a front grate 8, and a stepped stoker 20. The stalker 20 is disposed at the bottom of the combustion unit 19 and conveys the incinerated product supplied from the incinerated product supply unit 21 from the incinerated product supply unit 21 side to the incinerated ash discharge unit 18 side. The furnace wall 6 is disposed below the incineration material supply port 22. The furnace wall surface 6a of the furnace wall 6 faces the incineration ash discharge part 18 side. The stalker 20 includes moving grate 11, 13, 15 and fixed grate 12, 14, 16. In the grate 11 to 16, the moving grate and the fixed grate are alternately arranged in the conveying direction of the incinerated product. The movable grate 11, 13, 15 is attached to the drive base 10 supported by the support roller 17. When the drive base 10 is reciprocated by the moving grate drive device 9 such as a hydraulic cylinder, the moving grate 11, 13, 15 reciprocates along the back of the fixed grate 12, 14, 16, respectively. . The direction in which the moving grate 11, 13, 15 slides is in a vertical plane including the direction in which the stalker 20 conveys the incinerated material, and the moving grate 11, 13, 15 approaches the incinerated ash discharge unit 18. It is upward. In the stalker 20, the rear surfaces of the grate 11 to 16 face the upper side of the incineration material supply unit 21.

  The incinerated material on the stalker 20 is dried and burned while being conveyed from the incinerated material supply unit 21 side to the incinerated ash discharge unit 18 side by the stalker 20. At this time, the incinerated product is stirred and mixed by the stoker 20.

  FIG. 2 shows an enlarged view of the vicinity of the front grate 8 of FIG. The pre-grate 8 is disposed between the furnace wall 6 and the moving grate 11 located on the lower side of the furnace wall 6, and is attached to the pre-grate support 7 fixed to the lower part of the furnace wall 6. It is attached via a shaft portion 7a. The pre-grate 8 is in contact with the back surface 11 a of the moving grate 11 and can swing up and down around the shaft portion 7 a corresponding to the movement of the moving grate 11. Here, the moving grate 11 is disposed on the most upstream side in the conveying direction of the incinerated material among the grate 11 to 16 included in the stoker 20. The moving grate 11 slides back and forth along the back surface 12 a of the fixed grate 12 located on the downstream side of the moving grate 11.

  A plan view of the pre-grating 8 is shown in FIG. The pre-grate 8 includes a plate-like member 83 that prevents the incinerated material from leaking out of the combustion part 19 through the furnace wall 6 and the moving grate 11, and arm-like members 81 and 82. . Attachment portions 81 a and 82 a for attaching the front grate 8 to the front grate support portion 7 are provided at the base portion which is one end portion in the longitudinal direction of the arm-shaped members 81 and 82, respectively. The attachment portions 81a and 82a are circular through holes provided in the arm-shaped members 81 and 82, for example. The plate-like member 83 has a rectangular plate shape, and is fixed to the other end portion in the longitudinal direction of the arm-like members 81 and 82. The arm-shaped members 81 and 82 are parallel to each other in the longitudinal direction, and are opposed to each other with a space in the longitudinal direction of the plate-shaped member 83. Here, the thickness direction of the plate-like member 83 and the longitudinal direction of the arm-like members 81 and 82 are parallel, and the longitudinal direction of the plate-like member 83 and the axial direction of the shaft portion 7a are parallel.

  The pre-grating 8 is provided along the longitudinal direction of the arm-shaped member 81, and is provided along the longitudinal direction of the first rib 85 fixed to the arm-shaped member 81 and the arm-shaped member 82. And a second rib 86 fixed to 82. Here, a gap is provided between the first rib 85 and the second rib 86. The front grate 8 includes a third rib 87 that is fixed to the plate member 83 along the longitudinal direction of the plate member 83.

  In the pre-grate 8, since a gap is provided between the first rib 85 and the second rib 86, foreign matter is unlikely to accumulate between the furnace wall 6 and the pre-grate 8, and the foreign matter is bitten. Is prevented.

  Since the pre-grating 8 includes the first rib 85, the second rib 86, and the third rib 87, it is sturdy. The pre-grate 8 includes a third rib outer portion 87a and a second rib outer portion 86a, a third rib central portion 87b and a second rib inner portion 86b, a third rib central portion 87b and a first rib inner portion 85b, and a third rib. Since the rib outer portion 87c and the first rib outer portion 85a are integrated with each other, they are very strong.

  The pre-grate 8 may include only the first rib 85 and the second rib 86 without including the third rib 87. Further, when the pre-grating 8 includes the first rib 85 and the second rib 86, the first rib outer portion 85a and the second rib outer portion 86a, the first rib inner portion 85b, and the second rib inner portion 86b. It is also possible to provide only one of them, or both. Further, the third rib 87 may not include a part of the third rib outer portion 87a, the third rib central portion 87b, and the third rib outer portion 87c. Also, the third rib outer portion 87a and the second rib outer portion 86a, the third rib central portion 87b and the second rib inner portion 86b, the third rib central portion 87b and the first rib inner portion 85b, and the third rib outer portion 87c. And the 1st rib outer side part 85a is not integral, and can also be made into a different body.

FIG. 1 is an overall view of a stoker furnace according to an embodiment of the present invention. FIG. 2 is an enlarged view of FIG. FIG. 3 is a diagram showing a pre-grate according to the embodiment of the present invention. FIG. 4 is a view showing the vicinity of a pre-grating in a conventional stoker furnace. FIG. 5 is a diagram showing a conventional pre-grating.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hopper 2 ... Chute 3 ... Feeder 4 ... Feeder drive device 5 ... Feed table 6 ... Furnace wall 6a ... Furnace wall surface 7 ... Pre-grate support part 7a ... Shaft part 8 ... Pre-grate 9 ... Moving grate drive device 10 ... Drive base 11, 13, 15 ... Moving grate 11a, 12a ... Back side 12,14,16 ... Fixed grate 17 ... Support roller 18 ... Incineration ash discharge part 19 ... Combustion part 20 ... Stoker 21 ... Incineration substance supply part 22 ... incineration material supply ports 81, 82 ... arm-like members 81a, 82a ... mounting portion 83 ... plate-like member 85 ... first rib 85a ... first rib outer portion 85b ... first rib inner portion 86 ... second rib 86a ... second 2 rib outer part 86b ... 2nd rib inner part 87 ... 3rd rib 87a, 87c ... 3rd rib outer part 87b ... 3rd rib center part 106 ... furnace wall 106a ... furnace wall surface 107 ... front grate support part 107a ... axis Part 10 ... Previous grate 110 ... driving board 111 ... moving grate 112 ... fixed grate 112a ... back 120 ... stoker 181 ... arm-shaped members 181a, 182a ... mounting portion 183 ... plate-shaped member 184 ... reinforcing member

Claims (3)

A plate-like member;
A first arm member fixed to the plate member;
A second arm-shaped member fixed to the plate-shaped member;
A first rib provided along the longitudinal direction of the first arm-shaped member and fixed to the first arm-shaped member;
A second rib provided along the longitudinal direction of the second arm-shaped member and fixed to the second arm-shaped member;
The first arm-shaped member and the second arm-shaped member are opposed to each other with an interval so that the longitudinal directions of both are parallel to each other,
The first rib and the second rib are disposed inside or outside the first arm-like member and the second arm-like member,
A gap is provided between the first rib and the second rib. The pre-grate of claim 1,
A pre-lattice comprising a third rib provided along the longitudinal direction of the plate-like member and fixed to the plate-like member. A stoker furnace comprising the front grate according to claim 1 or 2.

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