A domestic waste incineration grate system

Abstract

The present invention provides a domestic waste incineration grate system, including an incinerator body, wherein the incinerator body is provided with a feeding unit, a grate incineration unit, and a slag discharge unit in sequence along the direction of waste feeding; the feeding unit is provided with a hopper module and a feeding module in sequence along the direction of waste feeding; the slag discharge unit is provided with a slag chute module and a slag discharger module in sequence along the direction of slag discharge; the grate incineration unit is provided with a drying grate section, a combustion grate section, and an ember grate section in sequence along the direction of waste incineration, and the drying ash hopper, the combustion ash hopper, and the ember ash hopper are respectively connected to the preheater through a preheating pipe, and the combustion grate is connected to the first cooling fan through a first cooling air duct. The present invention further provides a method for using a domestic waste incineration grate system. The domestic waste incineration grate system provided by the present invention solves the problem that the grate of the incinerator is not suitable for the operation of high calorific value waste, and the service life of the grate sheet is increased by more than 30%, thereby finally realizing the stable operation of the incinerator.

Description

Technical Field

[0001] The invention belongs to the technical field of waste incineration, and relates to a domestic waste incineration grate system, which has the characteristics of high speed, high pressure, forced air cooling and stable combustion, and is specially used for incinerating domestic waste with high calorific value. Background Art

[0002] With the gradual implementation of the classification of domestic domestic waste in cities, the calorific value of the waste entering the waste incinerator is also steadily increasing. At present, the calorific value of large-scale urban waste is in the range of (4.2MJ / Kg-14MJ / Kg). When the calorific value of the waste reaches 8.4MJ / Kg, the following problems are common in the operation of the combustion section grate: (1) The grate combustion area moves forward. In order to keep the furnace from overheating and reduce coking, the waste processing volume is reduced, resulting in a thinning of the waste layer. The temperature of the combustion section grate plate is obvious and prone to burning. (2) High calorific value waste burns quickly, the waste layer thickness is thinned, and the grate plate is easily exposed to the high-temperature corrosive atmosphere, aggravating wear. (3) The high-temperature grate plate expands due to heat, resulting in insufficient compensation of the grate plate absorber, the movable grate plate is easily stuck, and the working pressure of the hydraulic system is easily damaged by increasing the working pressure of the hydraulic system. (4) The replacement cycle of the grate plate is shortened, increasing the operation and maintenance costs.

[0003] Since domestic waste incinerators need to adapt to the need for high calorific value waste, the economic benefits of using high temperature resistant materials are not obvious. It is necessary to adopt reasonable design to reduce the working temperature of the grate to fundamentally solve the problem. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the object of the present invention is to provide a domestic waste incineration grate system, which is used to solve the problem that the grates of existing domestic waste incinerators are not suitable for the operation of high calorific value waste, and at the same time solve the problems of grate plate damage due to heat, sticking, short replacement cycle, etc.

[0005] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present invention provides a domestic waste incineration grate system, including an incinerator body, wherein the incinerator body is provided with a feeding unit, a grate incineration unit and a slag discharge unit in sequence along the waste feeding direction; the feeding unit is provided with a hopper module and a feeding module in sequence along the waste feeding direction; the slag discharge unit is provided with a slag chute module and a slag discharger module in sequence along the slag discharge direction; the grate incineration unit is provided with a drying grate section, a combustion grate section and an ember grate section in sequence along the waste incineration direction, the drying grate section includes a drying grate and a drying ash hopper located below the drying grate, the combustion grate section includes a combustion grate and a combustion ash hopper located below the combustion grate, the ember grate section includes an ember grate and an ember ash hopper located below the ember grate, the drying ash hopper, the combustion ash hopper and the ember ash hopper are respectively connected to the preheater via a preheating pipe, and the combustion grate is connected to the first cooling fan via a first cooling air duct.

[0006] Preferably, the side wall of the incinerator body is an air-cooled wall, and a second cooling air duct is provided in the air-cooled wall. The second cooling air duct passes through the feed end and the discharge end of the incinerator body in sequence along the garbage feeding direction. The second cooling air duct is connected to a second cooling fan and a preheater at one end extending outside the feed end of the incinerator body.

[0007] More preferably, the second cooling air duct is provided with a first cooling pipe section, a second cooling pipe section, and a third cooling pipe section in sequence along the garbage feeding direction, the first cooling pipe section runs through the feeding end of the incinerator body, the second cooling pipe section is located above the combustion grate section, and the third cooling pipe section runs through the discharge end of the incinerator body.

[0008] More preferably, the second cooling fan is externally connected to a second air pipe, and the second air pipe is provided with a second pressure gauge.

[0009] Preferably, the hopper module is a garbage hopper.

[0010] More preferably, a hopper valve is provided at the discharge end of the garbage hopper.

[0011] Preferably, the drying grate and the burning grate both include a first fixed bracket and a first movable bracket, both ends of the first fixed bracket are respectively connected to the upper inner wall of the drying ash hopper or the burning ash hopper, a plurality of first fixed grate pieces are provided on the first fixed bracket, and a plurality of first movable grate pieces are provided on the first movable bracket, the first movable grate pieces are cross-distributed with the first fixed grate pieces and adjacent first movable grate pieces are movably contacted and connected with the first fixed grate pieces, and the movement of the first movable bracket is used to drive the first movable grate pieces and the first fixed grate pieces to achieve linkage.

[0012] More preferably, the movable contact connection between the adjacent first movable grate slices and the first fixed grate slices means that, among the adjacent first movable grate slices and the first fixed grate slices, a pulley is provided at the bottom of one first movable grate slice or the first fixed grate slice, and a slide is provided at the top of the other adjacent first fixed grate slice or the first movable grate slice, and the pulley contacts and slides on the slide.

[0013] Preferably, the combustion grate includes a hollow second fixed bracket and a second movable bracket; the two ends of the second fixed bracket are respectively connected to the upper inner wall of the combustion ash hopper, the air inlet end of the second fixed bracket is connected to the first cooling air duct, and the air outlet end of the second fixed bracket is provided with a first nozzle, and the first nozzle is provided with a plurality of first nozzles; the air inlet end of the second movable bracket is connected to the first cooling air duct, and the air outlet end of the second movable bracket is provided with a second nozzle, and the second nozzle is provided with a plurality of second nozzles; the second fixed bracket is provided with a plurality of second fixed grate slices, and the second movable bracket is provided with a plurality of second movable grate slices, the second movable grate slices and the second fixed grate slices are cross-distributed and adjacent second movable grate slices are movably contacted and connected, and the movement of the second movable bracket is used to drive the second movable grate slices and the second fixed grate slices to achieve linkage.

[0014] More preferably, the movable contact connection between adjacent second movable grate pieces and second fixed grate pieces means that, among the adjacent second movable grate pieces and second fixed grate pieces, a second movable grate piece or a second fixed grate piece has a pulley at the bottom, and the other two adjacent second fixed grate pieces or second movable grate pieces have slideways at the top, and the pulleys slide in contact on the slideways.

[0015] Preferably, the horizontal cross-sections of the ash hopper chambers of the drying ash hopper, the combustion ash hopper and the ember ash hopper gradually decrease from top to bottom.

[0016] Preferably, the preheating pipe includes a preheating main pipe, the air inlet end of the preheating main pipe is connected to the preheater, and the preheating main pipe is connected to a first preheating branch pipe, a second preheating branch pipe, and a third preheating branch pipe, the air outlet end of the first preheating branch pipe is connected to the lower part of the drying ash hopper, the air outlet end of the second preheating branch pipe is connected to the lower part of the combustion ash hopper, and the air outlet end of the third preheating branch pipe is connected to the lower part of the burnt ash hopper.

[0017] More preferably, the first preheating branch pipe, the second preheating branch pipe and the third preheating branch pipe are all provided with an air volume regulating baffle and a flow meter, and the second preheating branch pipe and the third preheating branch pipe are also provided with a fourth pressure gauge.

[0018] Preferably, the first cooling fan is externally connected to a first air pipe, and the first air pipe is provided with a first pressure gauge.

[0019] Preferably, a third pressure gauge and a thermometer are provided on the first cooling air duct.

[0020] A second aspect of the present invention provides a use of a domestic waste incineration grate system in the incineration of domestic waste.

[0021] A third aspect of the present invention provides a method for using a domestic waste incineration grate system, comprising the following steps:

[0022] 1) The domestic waste is fed into the grate incineration unit of the incinerator body through the feeding unit, and dried in the drying grate section preheated by the primary preheated air generated by the preheater;

[0023] 2) The combustion grate of the combustion grate section is cooled by the first cooling fan to reduce the working temperature, and then the cooling air is mixed with the primary preheated air generated by the preheater to assist combustion, so that the domestic waste is burned;

[0024] 3) The domestic waste after combustion treatment is burned in the combustion grate preheated by the primary preheating air generated by the preheater;

[0025] 4) The waste residue after incineration is discharged through the slag discharge unit.

[0026] Preferably, in step 1), the temperature inside the incinerator is ≥ 850° C. When the above temperature is reached, garbage can be input through the feeding unit.

[0027] Preferably, in step 1), during the drying process, the preheating temperature of the preheater is 170-250° C. The garbage is dried in the drying section.

[0028] Preferably, in step 2), when the working temperature is lowered, the temperature of the cooling air is 15-45° C. It is used to lower the working temperature of the grate, with a relatively small overall air cooling ratio, and is directly mixed with the preheated air and enters the combustion section through the gap to participate in the garbage combustion.

[0029] Preferably, in step 2), during the combustion treatment, the preheating temperature of the preheater is 170-250° C. The garbage is directly burned when entering the combustion grate, that is, the dried garbage is directly burned with the preheated primary air.

[0030] Preferably, in step 3), during the incineration treatment, the sufficient heat reduction rate is less than 3%. When the combustible materials in the garbage are completely burned in the combustion stage, they enter the incineration stage for further incineration.

[0031] Preferably, in step 4), the garbage residue after the combustion treatment falls into the slag discharger module through the slag chute module and is discharged.

[0032] Preferably, in step 4), the slag generated by the drying, burning and ember burning of the garbage is discharged from the drying ash hopper, the burning ash hopper and the ember burning ash hopper through a slag discharge unit.

[0033] As described above, the domestic waste incineration grate system provided by the present invention has the following beneficial effects:

[0034] (1) The present invention provides a domestic waste incineration grate system, which uses normal temperature air as cooling air without changing the existing grate casting structure. A normal temperature high-speed and high-pressure cooling air duct is arranged at the bottom of the movable grate and the fixed grate in the combustion grate. The cooling fan is connected through the fixed bracket and the movable bracket, and high-pressure and high-speed air is used to directly blow the high-temperature part of the grate, thereby directly reducing the working temperature of the grate. After the cooling air cools the grate, it is mixed with the primary air and burned in the incinerator, thereby solving the problem that the grate of the domestic waste incinerator is not suitable for the operation of high calorific value garbage.

[0035] (2) The present invention provides a domestic waste incineration grate system, which can ensure the normal operation of the grate equipment when the waste calorific value is at a high calorific value of 8.4-14MJ / KG.

[0036] (3) The domestic waste incineration grate system provided by the present invention can directly reduce the working temperature of the grate plates, solve the problems of heat damage, jamming, short replacement cycle of small grate plates, etc., and increase the service life of the grate plates by more than 30%, ultimately achieving stable operation of the incinerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Shown is a schematic diagram of the overall structure of a domestic waste incineration grate system of the present invention.

[0038] Figure 2 Shown is a schematic structural diagram of the combustion grate in the grate incineration unit of the present invention.

[0039] Reference numerals

[0040] 1 Incinerator body

[0041] 2 Feeding unit

[0042] 21 Hopper module

[0043] 22 Feeding module

[0044] 23 Hopper valve

[0045] 3 Grate Incineration Unit

[0046] 31 Drying grate section

[0047] 311 Drying ash hopper

[0048] 312 Drying grate

[0049] 32 Combustion grate section

[0050] 321 Combustion ash hopper

[0051] 322 Combustion grate

[0052] 33 ember grate section

[0053] 331 Ash Hopper

[0054] 332 Ember Grate

[0055] 4 Slag discharge unit

[0056] 41 Slag chute module

[0057] 42 Slag discharger module

[0058] 5 Preheating tube

[0059] 51 Preheating the main pipe

[0060] 52 First preheating branch pipe

[0061] 53 Second preheating branch

[0062] 54 Third preheating branch pipe

[0063] 55 Air volume adjustment damper

[0064] 56 Flow Meter

[0065] 57 Fourth pressure gauge

[0066] 6 Preheater

[0067] 7 First cooling air duct

[0068] 8 First cooling fan

[0069] 91 First fixing bracket

[0070] 92 First movable bracket

[0071] 93 First fixed grate

[0072] 94 First movable grate

[0073] 101 Second fixing bracket

[0074] 102 Second movable bracket

[0075] 103 First Nozzle

[0076] 104 First Nozzle

[0077] 105 Second Nozzle

[0078] 106 Second Nozzle

[0079] 107 Second fixed grate

[0080] 108 Second movable grate

[0081] 11 Second cooling air duct

[0082] 111 First cooling pipe section

[0083] 112 Second cooling pipe section

[0084] 113 The third cooling pipe section

[0085] 12 Second cooling fan

[0086] 13 Second air pipe

[0087] 14 Second pressure gauge

[0088] 15 First air pipe

[0089] 16. First pressure gauge

[0090] 17 Third pressure gauge

[0091] 18 Thermometer DETAILED DESCRIPTION

[0092] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0093] See also Figure 1 to Figure 2 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0094] The present invention provides a domestic waste incineration grate system, such as Figure 1As shown, it includes an incinerator body 1, and the incinerator body 1 is provided with a feeding unit 2, a grate incineration unit 3, and a slag discharge unit 4 in sequence along the garbage feeding direction; the feeding unit 2 is provided with a hopper module 21 and a feeding module 22 in sequence along the garbage feeding direction; the slag discharge unit 4 is provided with a slag chute module 41 and a slag discharger module 42 in sequence along the slag discharge direction; the grate incineration unit 3 is provided with a drying grate section 31, a combustion grate section 32, and a burnout grate section 33 in sequence along the garbage incineration direction, and the drying grate section 31 includes a drying grate The drying grate 312 and the drying ash hopper 311 located below the drying grate 312, the combustion grate section 32 includes a combustion grate 322 and a combustion ash hopper 321 located below the combustion grate 322, the ember grate section 33 includes an ember grate 332 and an ember ash hopper 331 located below the ember grate 332, the drying ash hopper 311, the combustion ash hopper 321, and the ember ash hopper 331 are respectively connected to the preheater 6 via the preheating pipe 5, and the combustion grate 322 is connected to the first cooling fan 8 via the first cooling air duct 7.

[0095] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the side wall of the incinerator body 1 is an air-cooled wall, and a second cooling air duct 11 is arranged inside the air-cooled wall. The second cooling air duct 11 sequentially penetrates the feed end and the discharge end of the incinerator body 1 along the garbage feeding direction, and the second cooling air duct 11 is connected to a second cooling fan 12 and a preheater 6 at one end extending outside the feed end of the incinerator body 1. The air-cooled wall can reduce the side wall temperature and reduce high-temperature coking.

[0096] In a preferred embodiment, Figure 1 As shown, the second cooling duct 11 is provided with a first cooling pipe section 111, a second cooling pipe section 112, and a third cooling pipe section 113 in sequence along the garbage feeding direction, the first cooling pipe section 111 runs through the feeding end of the incinerator body 1, the second cooling pipe section 112 is located above the combustion grate section 32, and the third cooling pipe section 113 runs through the discharge end of the incinerator body 1. Normal temperature air is passed through the second cooling duct 11, which can reduce the high temperature coking of the combustion grate section 32 in the second cooling pipe section 112.

[0097] In a preferred embodiment, Figure 1 As shown, the second cooling fan 12 is a fan commonly used in a waste incinerator, and is used to input air to the combustion grate section 32. The second cooling fan 12 is externally connected to a second air pipe 13, and is used to introduce room temperature air as cooling air. The second air pipe 13 is provided with a second pressure gauge 14.

[0098] In the above-mentioned domestic waste incineration grate system, if Figure 1As shown, the hopper module 21 is a garbage hopper. The garbage hopper is a hopper conventionally used in a garbage incinerator for dumping garbage.

[0099] In a preferred embodiment, Figure 1 As shown, a hopper valve 23 is provided at the discharge end of the garbage hopper 21. The hopper valve 23 is used to control the garbage feeding.

[0100] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the feeding module 22 is a feeder commonly used in garbage incinerators, which can feed garbage into the drying grate section 31 of the grate incineration unit 3 .

[0101] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the slag chute module 41 is a slag chute commonly used in a waste incinerator, and is used to input the slag material after waste incineration into the slag discharger module 42 .

[0102] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the slag discharger module 42 is a slag discharger conventionally used in a waste incinerator, and is used to discharge slag material after waste incineration.

[0103] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the drying grate 312 and the burning grate 332 both include a first fixed bracket 91 and a first movable bracket 92, the two ends of the first fixed bracket 91 are respectively connected to the upper inner wall of the drying ash hopper 311 or the burning ash hopper 331, a plurality of first fixed grate slices 93 are provided on the first fixed bracket 91, and a plurality of first movable grate slices 94 are provided on the first movable bracket 92, the first movable grate slices 94 and the first fixed grate slices 93 are cross-distributed and adjacent first movable grate slices 94 and first fixed grate slices 93 are movably contacted and connected, and the movement of the first movable bracket 92 is used to drive the first movable grate slices 94 and the first fixed grate slices 93 to realize linkage.

[0104] In a preferred embodiment, the movable contact connection between the adjacent first movable grate slices 94 and first fixed grate slices 93 means that, among the adjacent first movable grate slices 94 and first fixed grate slices 93, a pulley is provided at the bottom of one first movable grate slice 94 or the first fixed grate slice 93, and a slide is provided at the top of the other adjacent first fixed grate slice 93 or the first movable grate slice 94, and the pulley slides in contact on the slide.

[0105] In the above-mentioned domestic waste incineration grate system, if Figure 2As shown, the combustion grate 322 includes a hollow second fixed support 101 and a second movable support 102; the two ends of the second fixed support 101 are respectively connected to the upper inner wall of the combustion ash hopper 321, the air inlet end of the second fixed support 101 is connected to the first cooling air duct 7, and the air outlet end of the second fixed support 101 is provided with a first nozzle 103, and the first nozzle 103 is provided with a plurality of first nozzles 104; the air inlet end of the second movable support 102 is connected to the first cooling air duct 7, and the air outlet end of the second movable support 102 is provided with a first nozzle 104. Second nozzle 105, the second nozzle 105 is provided with a plurality of second nozzles 106; the second fixed bracket 101 is provided with a plurality of second fixed grate pieces 107, the second movable bracket 102 is provided with a plurality of second movable grate pieces 108, the second movable grate pieces 108 and the second fixed grate pieces 107 are cross-distributed and the adjacent second movable grate pieces 108 and the second fixed grate pieces 107 are movably contacted and connected, the second movable bracket 102 moves to drive the second movable grate pieces 108 and the second fixed grate pieces 107 to realize linkage.

[0106] In a preferred embodiment, the movable contact connection between adjacent second movable grate slices 108 and second fixed grate slices 107 means that, among the adjacent second movable grate slices 108 and second fixed grate slices 107, a second movable grate slice 108 or a second fixed grate slice 107 is provided with a pulley at the bottom, and the other two adjacent second fixed grate slices 107 or second movable grate slices 108 are provided with a slide at the top, and the pulley slides in contact on the slide.

[0107] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the horizontal cross-sections of the ash hopper chambers of the drying ash hopper 311, the combustion ash hopper 321, and the ember ash hopper 331 gradually decrease from top to bottom, ensuring that the high-temperature ash from the grate enters the under-furnace conveying equipment.

[0108] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the preheating pipe 5 includes a preheating main pipe 51, the air inlet end of the preheating main pipe 51 is connected to the preheater 6, and the preheating main pipe 51 is connected to a first preheating branch pipe 52, a second preheating branch pipe 53, and a third preheating branch pipe 54. The air outlet end of the first preheating branch pipe 52 is connected to the lower part of the drying ash hopper 311, the air outlet end of the second preheating branch pipe 53 is connected to the lower part of the combustion ash hopper 321, and the air outlet end of the third preheating branch pipe 54 is connected to the lower part of the burnt ash hopper 331.

[0109] In a preferred embodiment, the first preheating branch pipe 52, the second preheating branch pipe 53 and the third preheating branch pipe 54 are all provided with an air volume regulating baffle 55 and a flow meter 56, and the second preheating branch pipe 53 and the third preheating branch pipe 54 are also provided with a fourth pressure gauge 57 for adjusting the cooling air volume.

[0110] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the preheater 6 is a preheating fan conventionally used in a waste incinerator, and can be used to heat the primary air input by the second cooling fan 12 and preheat the drying ash hopper 311 , the combustion ash hopper 321 , and the ember ash hopper 331 .

[0111] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the first cooling fan 8 is a fan commonly used in garbage incinerators, which is used to directly blow the high-temperature part of the combustion grate 322 with high-pressure and high-speed air, thereby directly reducing the working temperature of the combustion grate 322, and after the grate is cooled, it is mixed with the primary preheated air generated by the preheater 6 and enters the incinerator for combustion.

[0112] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the first cooling fan 8 is externally connected to a first air pipe 15 for introducing normal temperature air as cooling air.

[0113] In a preferred embodiment, Figure 1 As shown, the first air pipe 15 is provided with a first pressure gauge 16 .

[0114] In the above-mentioned domestic waste incineration grate system, if Figure 1 As shown, the first cooling air duct 7 is provided with a third pressure gauge 17 and a thermometer 18 .

[0115] Example 1

[0116] The domestic garbage is fed into the grate incineration unit of the incinerator body through the feeding unit, and dried at 170-250°C in the drying grate section preheated by the primary preheated air generated by the preheater. The first cooling fan generates cooling air to reduce the working temperature of the combustion grate in the combustion grate section to 15-45°C, and then the cooling air is mixed with the primary preheated air generated by the preheater at 170-250°C to assist combustion, so that the domestic garbage can be burned. The domestic garbage after the combustion treatment is burned in the ember grate preheated by the primary preheated air generated by the preheater, and the sufficient heat reduction rate is less than 3%. The garbage residue after the ember treatment is discharged through the slag discharge unit. The leakage slag generated by the garbage drying, combustion, and ember burning is discharged from the drying ash hopper, the combustion ash hopper, and the ember ash hopper through the slag discharge unit.

[0117] Before the garbage enters the incinerator, keep the hopper gate closed, heat the incinerator through ignition burner and auxiliary combustion, keep the temperature in the furnace at 850℃, then open the hopper gate, and the garbage passes through the garbage hopper, feeder, and drying grate section, and is ignited in the combustion section to achieve garbage combustion and ember burning. The feeder, drying grate, combustion grate, and ember grate are driven by the grate hydraulic system to continuously transport garbage, thereby ensuring continuous and stable operation of the garbage incinerator.

[0118] Conventional garbage grate type garbage incinerator, when no garbage is put into it, due to the increase of furnace temperature, the heat-resistant parts such as grate plates are easily heated and expanded, sluggish, grate stuck, or even partially burned at high temperature. If the primary air is added to the incinerator, the furnace temperature will rise slowly; when the grate is in a stable operating state, the calorific value of the garbage is unstable. When processing high calorific value garbage, the garbage combustion rate is fast, which can easily cause the grate to be exposed to the high-temperature combustion environment, and the heat-resistant parts such as grate plates are easily heated and expanded, sluggish, grate stuck, or even partially burned at high temperature. Through this patented technology, the high-temperature combustion grate is forced to cool separately, the overall air volume is small, the temperature is low, the temperature of the combustion grate plates is greatly reduced, the service life of the grate plates is increased by more than 30%, and the investment cost is low.

[0119] In summary, the domestic waste incineration grate system provided by the present invention solves the problem that the grate of the incinerator is not suitable for the operation of high calorific value waste, and the service life of the grate plate is increased by more than 30%, and finally the stable operation of the incinerator is achieved. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0120] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A domestic waste incineration grate system, characterized in that: The invention comprises an incinerator body (1), wherein the incinerator body (1) is provided with a feeding unit (2), a grate incineration unit (3), and a slag discharge unit (4) in sequence along the direction of garbage feeding; the feeding unit (2) is provided with a hopper module (21) and a feeding module (22) in sequence along the direction of garbage feeding; the slag discharge unit (4) is provided with a slag chute module (41) and a slag discharger module (42) in sequence along the direction of slag discharge; the grate incineration unit (3) is provided with a drying grate section (31), a combustion grate section (32), and a burnout grate section (33) in sequence along the direction of garbage incineration, wherein the drying grate section (31) comprises a drying grate (31 2) and a drying ash hopper (311) located below the drying grate (312), the combustion grate section (32) includes a combustion grate (322) and a combustion ash hopper (321) located below the combustion grate (322), the ember grate section (33) includes an ember grate (332) and an ember ash hopper (331) located below the ember grate (332), the drying ash hopper (311), the combustion ash hopper (321), and the ember ash hopper (331) are respectively connected to the preheater (6) via the preheating pipe (5), and the combustion grate (322) is connected to the first cooling fan (8) via the first cooling air duct (7); The combustion grate (322) comprises a hollow second fixed support (101) and a second movable support (102); the two ends of the second fixed support (101) are respectively connected to the upper inner wall of the combustion ash hopper (321); the air inlet end of the second fixed support (101) is connected to the first cooling air duct (7); the air outlet end of the second fixed support (101) is provided with a first nozzle (103); the first nozzle (103) is provided with a plurality of first nozzles (104); the air inlet end of the second movable support (102) is connected to the first cooling air duct (7); the air outlet end of the second movable support (102) is provided with a second The nozzle (105) is provided with a plurality of second nozzles (106); the second fixed support (101) is provided with a plurality of second fixed grate pieces (107); the second movable support (102) is provided with a plurality of second movable grate pieces (108); the second movable grate pieces (108) and the second fixed grate pieces (107) are cross-distributed and adjacent second movable grate pieces (108) and second fixed grate pieces (107) are movably contact-connected; the second movable support (102) moves to drive the second movable grate pieces (108) and the second fixed grate pieces (107) to realize linkage; The horizontal cross-sections of the ash hopper chambers of the drying ash hopper (311), the combustion ash hopper (321), and the burnt ash hopper (331) gradually decrease from top to bottom.

2. A domestic waste incineration grate system according to claim 1, characterized in that: The side wall of the incinerator body (1) is an air-cooled wall, and a second cooling air duct (11) is arranged inside the air-cooled wall. The second cooling air duct (11) sequentially penetrates the feed end and the discharge end of the incinerator body (1) along the garbage feeding direction. The second cooling air duct (11) is connected to a second cooling fan (12) and a preheater (6) at one end extending outside the feed end of the incinerator body (1).

3. A domestic waste incineration grate system according to claim 2, characterized in that: The second cooling air duct (11) is provided with a first cooling pipe section (111), a second cooling pipe section (112), and a third cooling pipe section (113) in sequence along the garbage feeding direction; the first cooling pipe section (111) passes through the feeding end of the incinerator body (1); the second cooling pipe section (112) is located above the combustion grate section (32); and the third cooling pipe section (113) passes through the discharge end of the incinerator body (1); the second cooling fan (12) is externally connected to a second air pipe (13); and a second pressure gauge (14) is provided on the second air pipe (13).

4. A domestic waste incineration grate system according to claim 1, characterized in that: The hopper module (21) is a garbage hopper; a hopper valve (23) is provided at the discharge end of the garbage hopper.

5. A domestic waste incineration grate system according to claim 1, characterized in that: The drying grate (312) and the burning grate (332) both include a first fixed support (91) and a first movable support (92), the two ends of the first fixed support (91) are respectively connected to the upper inner wall of the drying ash hopper (311) or the burning ash hopper (331), a plurality of first fixed grate plates (93) are arranged on the first fixed support (91), and a plurality of first movable grate plates (94) are arranged on the first movable support (92), the first movable grate plates (94) and the first fixed grate plates (93) are cross-distributed, and adjacent first movable grate plates (94) and first fixed grate plates (93) are movably contact-connected, and the first movable support (92) moves to drive the first movable grate plates (94) and the first fixed grate plates (93) to realize linkage.

6. A domestic waste incineration grate system according to claim 1, characterized in that: The preheating pipe (5) comprises a preheating main pipe (51), the air inlet end of the preheating main pipe (51) is connected to the preheater (6), the preheating main pipe (51) is connected to a first preheating branch pipe (52), a second preheating branch pipe (53), and a third preheating branch pipe (54), the air outlet end of the first preheating branch pipe (52) is connected to the lower part of the drying ash hopper (311), the air outlet end of the second preheating branch pipe (53) is connected to the lower part of the combustion ash hopper (321), and the air outlet end of the third preheating branch pipe (54) is connected to the lower part of the burnt ash hopper (331); the first preheating branch pipe (52), the second preheating branch pipe (53) and the third preheating branch pipe (54) are all provided with an air volume adjustment baffle (55) and a flow meter (56), and the second preheating branch pipe (53) and the third preheating branch pipe (54) are also provided with a fourth pressure gauge (57).

7. A domestic waste incineration grate system according to claim 1, characterized in that: The first cooling fan (8) is externally connected to a first air pipe (15), and the first air pipe (15) is provided with a first pressure gauge (16); the first cooling air pipe (7) is provided with a third pressure gauge (17) and a thermometer (18).

8. Use of a domestic waste incineration grate system according to any one of claims 1 to 7 in the incineration of domestic waste.

9. A method for using a domestic waste incineration grate system according to any one of claims 1 to 7, comprising the following steps: 1) The domestic waste is fed into the grate incineration unit of the incinerator body through the feeding unit, and dried in the drying grate section preheated by the primary preheated air generated by the preheater; 2) The combustion grate of the combustion grate section is cooled by the first cooling fan to reduce the working temperature, and then the cooling air is mixed with the primary preheated air generated by the preheater to assist combustion, so that the domestic waste is burned; 3) The domestic waste after combustion treatment is burned in the combustion grate preheated by the primary preheating air generated by the preheater; 4) The waste residue after incineration is discharged through the slag discharge unit.

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