Waste incineration grate furnace

Abstract

The present invention discloses a waste incineration grate furnace, which includes an incineration grate, a front arch wall, a rear arch wall and a flue. Among them, the incineration grate includes a drying section grate, a combustion section grate and an afterburning section grate that are all arranged in an inclined shape with the front high and the rear low and are arranged in sequence from front to back. The rear end of the drying section grate is higher than the front end of the combustion section grate, and the rear end of the combustion section grate is higher than the front end of the afterburning section grate; the front arch wall is located above the drying section grate and completely covers the drying section grate in the vertical projection; the rear arch wall is arranged in an inclined shape with the front high and the rear low, and the included angle between the rear arch wall and the horizontal plane is 39°-43°. The rear arch wall is located above the afterburning section grate and the combustion section grate, and the rear arch wall completely covers the afterburning section grate and covers 1 / 3 to 1 / 2 of the area of the combustion section grate in the vertical projection. The present invention has a high solid waste co-disposal rate, reduced pollutant emissions in the flue gas, and improved energy utilization efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of waste incineration treatment, and in particular to a waste incineration grate furnace. Background Art

[0002] In China, organic solid waste is large in quantity, wide in distribution, and complex in composition. Energy utilization is the core means of harmless treatment and reduction. There are common problems in the incineration process, such as low co-disposal rate of various solid wastes, difficult ultra-low emission of pollutants, and room for improvement in energy utilization efficiency.

[0003] The combustion reaction and process of waste in the incineration furnace are very complex, involving drying and dehydration of organic waste, combustion reaction, and burnout into ash, as well as the interaction between the solid phase and gas phase in the furnace. It has always been a research difficulty in the domestic and foreign industries. Moreover, due to the high combustion temperature, complex chemical composition, and complex chemical reactions in the furnace, it is very difficult to directly measure the temperature field, velocity field, and content of each generated component in the furnace with measuring components. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a waste incineration grate furnace with high co-disposal rate of solid waste, reduced pollutant emissions in flue gas, and improved energy utilization efficiency.

[0005] According to an embodiment of the present invention, the waste incineration grate furnace includes:

[0006] An incineration grate, which includes a drying section grate, a combustion section grate, and an afterburning section grate that can be adjusted separately in motion. The drying section grate, the combustion section grate, and the afterburning section grate are all arranged in an inclined shape with the front end higher than the rear end and are arranged in sequence from front to back. The rear end of the drying section grate is higher than the front end of the combustion section grate, and the rear end of the combustion section grate is higher than the front end of the afterburning section grate. Primary air inlets for air intake from bottom to top are provided on the drying section grate, the combustion section grate, and the afterburning section grate;

[0007] A front arch wall, which is located above the drying section grate and completely covers the drying section grate in the vertical projection;

[0008] A rear arch wall, which is arranged in an inclined shape with the front end higher than the rear end. The included angle between the rear arch wall and the horizontal plane is 39° - 43°. The rear arch wall is located above the afterburning section grate and the combustion section grate. A part of the rear arch wall completely covers the afterburning section grate in the vertical projection, and the remaining part of the rear arch wall covers 1 / 3 to 1 / 2 of the area of the combustion section grate in the vertical projection;

[0009] A flue, which is vertically arranged and connected between the rear end of the front arch wall and the front end of the rear arch wall.

[0010] In the waste incineration grate furnace according to the embodiment of the present invention, since the front arch wall is low and short and covers the drying section grate, the waste dries quickly at the drying section grate, which is beneficial to the forward movement of the waste combustion point; while the rear arch wall is high and long, covering the entire area of the burnout section and 1 / 3 to 1 / 2 of the area of the combustion section grate, the flue gas in the burnout section under the rear arch wall can be guided to the combustion section, making full use of the radiant heat transfer of the rear arch wall of the furnace and the convective heat transfer of the air flow, and enabling the blown hot ash particles and carbon particles to flow back to the surface of the waste layer, ensuring the full combustion of the waste in the furnace and playing a certain ignition role. Therefore, the full combustion of the waste in the furnace can be ensured. In summary, the solid waste co-disposal rate of the embodiment of the present invention is high, the pollutant emissions in the flue gas are reduced, and the energy utilization efficiency is improved.

[0011] According to some embodiments of the present invention, the rear end of the rear arch wall is located above the rear of the rear end of the burnout section grate.

[0012] According to some embodiments of the present invention, the front end of the front arch wall coincides with the front end of the drying section grate in the vertical projection, and the rear end of the front arch wall is located above the rear of the rear end of the drying section grate.

[0013] According to a further embodiment of the present invention, the front arch wall is arranged in an inclined shape with the front low and the rear high or in a horizontal shape, and the included angle between the front arch wall and the horizontal plane is 0 to 5° or 28° to 32°.

[0014] According to a still further embodiment of the present invention, when the included angle between the front arch wall and the horizontal plane is 28° to 32°, the front end of the rear arch wall is approximately flush or flush with the rear end of the front arch wall in height.

[0015] According to a still further embodiment of the present invention, the included angle between the front arch wall and the horizontal plane is 0 to 5°, and the front end of the rear arch wall is higher than the rear end of the front arch wall.

[0016] According to some embodiments of the present invention, secondary air inlets are provided at the connection part between the front arch wall and the flue and at the connection between the rear arch wall and the flue.

[0017] According to some embodiments of the present invention, the drying section grate, the combustion section grate, and the burnout section grate all include a plurality of movement modules arranged in sequence in the left-right direction, for pushing the waste on the movement modules to move from the front high place to the rear low place.

[0018] According to a further embodiment of the present invention, the gaps between two adjacent movement modules form the primary air inlets.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic structural diagram of a waste incineration grate furnace according to an embodiment of the present invention.

[0022] Figure 2 is a schematic structural diagram of a waste incineration grate furnace according to another embodiment of the present invention.

[0023] Figure 3 is a schematic structural diagram of a drying section grate, a combustion section grate, or an afterburning section grate in an embodiment of the present invention.

[0024] Figure 4 is Figure 1 an experimental simulation diagram of

[0025] Figure 5 is Figure 2 an experimental simulation diagram of

[0026] Figure 6 is an experimental simulation diagram of an existing furnace type.

[0027] Reference numerals:

[0028] Waste incineration grate furnace 1000

[0029] Incineration grate 1, drying section grate 101, combustion section grate 102, afterburning section grate 103

[0030] Front arch wall 2

[0031] Rear arch wall 3

[0032] Flue 4

[0033] Primary air inlet 5

[0034] Secondary air inlet 6

[0035] Motion module 7 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0037] In view of the problems existing in the structure of the existing grate-fired incinerator, such as low co-disposal rate of various solid wastes, difficulty in achieving ultra-low emissions of pollutants, and room for improvement in energy utilization efficiency, the present invention proposes a new design structure of a waste incinerator type by reasonably adjusting the front arch and the rear arch of the waste incineration furnace chamber (including the angle, length, and height), combined with the grate angle and the secondary air arrangement, aiming at the characteristics of high moisture content of domestic waste in China, so as to meet the requirements of different waste incineration conditions in various regions.

[0038] As Figure 6 shown, the angle between the front arch wall of the existing furnace type structure and the horizontal plane is 15°, and the angle between the rear arch wall and the horizontal is 41°, which is only suitable when the secondary air velocity is relatively high. Moreover, the ignition effect of this furnace type is limited and cannot meet the drying and pyrolysis requirements of high-moisture waste.

[0039] As Figures 1 to 3 shown, the waste incinerator grate furnace 1000 according to an embodiment of the present invention includes an incinerator grate 1, a front arch wall 2, a rear arch wall 3, and a flue 4. Among them, the incinerator grate 1 includes a drying section grate 101 that can be adjusted and moved independently, a combustion section grate 102 that can be adjusted and moved independently, and an afterburning section grate 103 that can be adjusted and moved independently. The drying section grate 101, the combustion section grate 102, and the afterburning section grate 103 are all arranged in an inclined shape with the front end higher than the rear end and are arranged in sequence from front to back. The rear end of the drying section grate 101 is higher than the front end of the combustion section grate 102, and the rear end of the combustion section grate 102 is higher than the front end of the afterburning section grate 103. Primary air inlets 5 for air intake from bottom to top are provided on the drying section grate 101, the combustion section grate 102, and the afterburning section grate 103. The front arch wall 2 is located above the drying section grate 101 and completely covers the drying section grate 101 in the vertical projection. The rear arch wall 3 is arranged in an inclined shape with the front end higher than the rear end, and the angle between the rear arch wall 3 and the horizontal plane is 39° - 43°. The rear arch wall 3 is located above the afterburning section grate 103 and the combustion section grate 102. A part of the rear arch wall 3 completely covers the afterburning section grate 103 in the vertical projection, and the remaining part of the rear arch wall 3 covers 1 / 3 to 1 / 2 of the area of the combustion section grate 102 in the vertical projection. The flue 4 is arranged vertically and is connected between the rear end of the front arch wall 2 and the front end of the rear arch wall 3.

[0040] Specifically, the waste incinerator grate furnace 1000 according to an embodiment of the present invention includes an incinerator grate 1, a front arch wall 2, a rear arch wall 3, and a flue 4. Among them, the incinerator grate 1, the front arch wall 2, and the rear arch wall 3 together form the furnace chamber of the waste incinerator grate furnace 1000, and the flue 4 is located above the furnace chamber and is communicated with the furnace chamber.

[0041] The incinerator grate 1 includes a drying section grate 101 with individually adjustable movement, a combustion section grate 102 with individually adjustable movement, and an afterburning section grate 103 with individually adjustable movement. The drying section grate 101, the combustion section grate 102, and the afterburning section grate 103 are all arranged in an inclined shape with the front end higher than the rear end and are arranged in sequence from front to back. The rear end of the drying section grate 101 is higher than the front end of the combustion section grate 102, and the rear end of the combustion section grate 102 is higher than the front end of the afterburning section grate 103. Thus, through the movement of the drying section grate 101, the movement of the combustion section grate 102, and the movement of the afterburning section grate, the garbage entering from the front end of the drying section grate 101 can be gradually pushed from the front end of the drying section grate 101 to the rear end of the afterburning section grate 103, so that the garbage entering the furnace chamber is successively dried and dehydrated at the drying section grate 101, undergoes a combustion reaction at the combustion section grate 102, and then is burned to ashes at the afterburning section grate 103 and discharged from the outlet at the rear end of the drying section grate 101. Primary air inlets 5 for air intake from bottom to top are provided on the drying section grate 101, the combustion section grate 102, and the afterburning section grate 103. Thus, the garbage in the furnace chamber can undergo a combustion reaction.

[0042] The front arch wall 2 is located above the drying section grate 101 and its vertical projection completely covers the drying section grate 101. It can be understood that the front arch wall 2 is relatively close to the drying section grate 101 and is relatively short in terms of the front-back distance of the entire incinerator grate 1, and the vertical projection of the front arch wall 2 completely covers the area of the drying section grate 101, enhancing the reradiation effect of the front arch wall 2, which can extend the residence time of the high-temperature flue gas in the furnace chamber, strengthen the drying capacity of the garbage, be conducive to the drying pyrolysis of high-moisture garbage, and avoid a large amount of moisture entering the combustion section and causing the combustion point to move backward.

[0043] The rear arch wall 3 is arranged in an inclined shape with the front end higher than the rear end, and the included angle between the rear arch wall 3 and the horizontal plane is 39° - 43°. For example, the included angle between the rear arch wall 3 and the horizontal plane can be 39°, 41°, 43°, etc. The rear arch wall 3 is located above the afterburning section grate 103 and the combustion section grate 102. A part of the rear arch wall 3 has a vertical projection that completely covers the afterburning section grate 103, and the remaining part of the vertical projection of the rear arch wall 3 covers 1 / 3 to 1 / 2 of the area of the combustion section grate 102. It can be understood that the rear arch wall 3 is relatively far from the combustion section grate 102 and the afterburning section grate 103 and is relatively long in terms of the front-back distance of the entire incinerator grate 1, and the rear arch wall 3 covers the entire area of the afterburning section and 1 / 3 to 1 / 2 of the area of the combustion section grate 102. It can guide the afterburning section flue gas under the rear arch wall 3 to the combustion section, make full use of the radiation heat transfer and gas flow convection heat transfer of the rear arch wall 3 of the furnace chamber, and enable the blown-up glowing ash particles and carbon particles to flow back and fall onto the surface of the garbage layer, ensuring the full combustion of the garbage in the furnace chamber and playing a certain ignition role.

[0044] The flue 4 is vertically arranged and connected between the rear end of the front arch wall 2 and the front end of the rear arch wall 3. It can be understood that the flue 4 is located above the grate 102 in the combustion section, which is beneficial to the emission of flue gas.

[0045] For the waste incineration grate furnace 1000 according to the embodiment of the present invention, since the front arch wall 2 is low and short and covers the drying grate 101, the waste dries quickly at the drying grate 101, which is beneficial to the forward movement of the waste combustion point; while the rear arch wall 3 is high and long, covering the entire area of the burnout section and 1 / 3 to 1 / 2 of the area of the combustion grate 102, the flue gas in the burnout section under the rear arch wall 3 can be guided to the combustion section, making full use of the radiant heat transfer of the rear arch wall 3 of the furnace and the convective heat transfer of the air flow, and enabling the blown hot ash particles and carbon particles to flow back to the surface of the waste layer, ensuring the full combustion of the waste in the furnace and playing a certain ignition role. Therefore, the full combustion of the waste in the furnace can be ensured. In summary, the solid waste co-disposal rate of the embodiment of the present invention is high, the pollutant emissions in the flue gas are reduced, and the energy utilization efficiency is improved.

[0046] According to some embodiments of the present invention, the rear end of the rear arch wall 3 is located above the rear of the rear end of the burnout grate 103. Thus, it is more beneficial to guide the flue gas in the burnout section under the rear arch wall 3 to the combustion section, making full use of the radiant heat transfer of the rear arch wall 3 of the furnace and the convective heat transfer of the air flow, and enabling the blown hot ash particles and carbon particles to flow back to the surface of the waste layer, ensuring the full combustion of the waste in the furnace and playing a certain ignition role

[0047] According to some embodiments of the present invention, the front end of the front arch wall 2 coincides with the front end of the drying grate 101 in the vertical projection, and the rear end of the front arch wall 2 is located above the rear of the rear end of the drying grate 101. Thus, the re-radiation effect of the front arch wall 2 can be enhanced more, the residence time of the high-temperature flue gas in the furnace can be extended more, the drying capacity of the drying section at the drying grate 101 is stronger, which is beneficial to the drying and pyrolysis of high-moisture waste, and avoids the combustion point from moving backward due to a large amount of moisture entering the combustion section.

[0048] According to a further embodiment of the present invention, the front arch wall 2 is arranged in an inclined shape with the front low and the rear high or in a horizontal shape, and the included angle between the front arch wall 2 and the horizontal plane is 0 to 5° or 28° to 32°. It can be understood that the included angle between the front arch wall 2 and the horizontal plane can be any angle within 0 to 5°, for example, the included angle between the front arch wall 2 and the horizontal plane is 0, 1°, 2°, 3°, 4°, 5° and other degrees. This angle range can make the front arch wall 2 arranged in a horizontal shape or close to a horizontal shape, and can make the front arch wall 2 have a smaller distance relative to the drying section grate 101. Especially, the distance between the rear part of the front arch wall 2 and the rear part of the drying section grate 101 is reduced more significantly. Compared with the existing furnace type design, the re-radiation effect of the front arch wall 2 is greatly enhanced, the residence time of the high-temperature flue gas in the furnace is greatly extended, and the drying ability of the garbage is greatly strengthened. This structure is very beneficial to the drying and pyrolysis of high-moisture garbage, and avoids a large amount of moisture entering the combustion section and causing the combustion point to move backward. The included angle between the front arch wall 2 and the horizontal plane can also be any angle within 28° to 32°, for example, the included angle between the front arch wall 2 and the horizontal plane is 28°, 29°, 30°, 31°, 32° and other degrees. This angle range can make the front arch wall 2 arranged in an inclined shape. The smaller distance between the front arch wall 2 and the drying section grate 101 enhances the re-radiation effect of the front arch wall 2, can extend the residence time of the high-temperature flue gas in the furnace, strengthen the drying ability of the garbage, is beneficial to the drying and pyrolysis of high-moisture garbage, and avoids a large amount of moisture entering the combustion section and causing the combustion point to move backward.

[0049] According to a further embodiment of the present invention, when the included angle between the front arch wall 2 and the horizontal plane is 28° to 32°, the front end of the rear arch wall 3 is close to or flush with the rear end of the front arch wall 2. Thus, it can ensure the full combustion of the garbage.

[0050] According to a further embodiment of the present invention, when the included angle between the front arch wall 2 and the horizontal plane is 0 to 5°, the front end of the rear arch wall 3 is higher than the rear end of the front arch wall 2. Thus, it can ensure the full combustion of the garbage.

[0051] As Figure 1 and Figure 2 shown, according to some embodiments of the present invention, secondary air inlets 6 are provided at the connection part between the front arch wall 2 and the flue 4 and at the connection between the rear arch wall 3 and the flue 4. Thus, with the injection of the secondary air, the gas flow disturbance and mixing in the furnace are increased, and the high-temperature zone in the furnace is more concentrated in the combustion section. This is beneficial to the combustion reaction of the garbage, the temperature field at the outlet is uniform, the turbulence degree of the flow field is very good, which is beneficial to the complete combustion of the combustible gas, is beneficial to the residence time of the flue gas above 850°C exceeding 2 s, reduces the generation of dioxins, and is beneficial to inhibiting the generation of thermal type NOx.

[0052] As Figure 3According to some embodiments of the present invention, the drying section grate 101, the combustion section grate 102, and the burnout section grate 103 each include a plurality of movement modules 7 arranged in sequence in the left-right direction, which are used to push the garbage on the movement modules 7 to move from the front high position to the back low position. Thus, the individual movements of the drying section grate 101, the combustion section grate 102, and the burnout section grate 103 are respectively realized.

[0053] As Figure 3 shown, according to a further embodiment of the present invention, the gaps between two adjacent movement modules form a primary air inlet 5. Thus, the structure of the primary air inlet 5 is simple, and it can make the primary air inlet more evenly distributed in the furnace, which is beneficial to ensuring uniform and sufficient combustion of the garbage and improving the combustion efficiency of the garbage.

[0054] The following uses two specific examples to illustrate the waste incineration grate furnace 1000 of the present invention.

[0055] Specific Example 1:

[0056] As Figure 1 、 Figure 3 and Figure 4 shown, the waste incineration grate furnace 1000 includes an incineration grate 1, a front arch wall 2, a rear arch wall 3, and a flue 4.

[0057] Specifically, the incineration grate 1 includes a drying section grate 101 that can be adjusted independently in movement, a combustion section grate 102 that can be adjusted independently in movement, and a burnout section grate 103 that can be adjusted independently in movement. The drying section grate 101, the combustion section grate 102, and the burnout section grate 103 are all arranged in an inclined shape with the front high and the back low and are arranged in sequence from the front to the back. The rear end of the drying section grate 101 is higher than the front end of the combustion section grate 102, and the rear end of the combustion section grate 102 is higher than the front end of the burnout section grate 103; a primary air inlet 5 for air intake from the bottom to the top is provided on each of the drying section grate 101, the combustion section grate 102, and the burnout section grate 103.

[0058] The front arch wall 2 is located above the drying section grate 101 and completely covers the drying section grate 101 in the vertical projection. Specifically, the front end of the front arch wall 2 coincides with the front end of the drying section grate 101 in the vertical projection, the rear end of the front arch wall 2 is located above the rear of the rear end of the drying section grate 101, and the front arch wall 2 is arranged in an inclined shape with the front low and the back high, and the angle between the front arch wall 2 and the horizontal plane is 30°.

[0059] The rear arch wall 3 is arranged in an inclined shape with the front high and the rear low. The included angle between the rear arch wall 3 and the horizontal plane is 41°. The rear arch wall 3 is located above the burnout section grate 103 and the combustion section grate 102. A part of the rear arch wall 3 projects completely to cover the burnout section grate 103 in the vertical direction, and the remaining part of the rear arch wall 3 projects to cover half of the area of the combustion section grate 102 in the vertical direction. The front end of the rear arch wall 3 is basically at the same height as the rear end of the front arch wall 2, and the rear end of the rear arch wall 3 is located above the rear of the rear end of the burnout section grate 103.

[0060] The flue 4 is arranged vertically and is connected between the rear end of the front arch wall 2 and the front end of the rear arch wall 3.

[0061] The simulation experiment results of the waste incineration grate furnace 1000 in Specific Example 1 are (as Figure 4 shown): As Figure 4 can be seen, compared with the existing furnace type design, this new type of furnace design guides the flue gas in the burnout section under the rear arch to the combustion section, makes full use of the radiant heat transfer and gas convection heat transfer of the furnace rear arch, and can make the blown hot ash particles and carbon particles flow back to the surface of the waste layer, ensuring the full combustion of the waste in the furnace. This new type of incinerator structure design has a certain ignition effect.

[0062] Specific Example 2:

[0063] As Figure 2 , Figure 3 and Figure 5 shown, the waste incineration grate furnace 1000 includes an incineration grate 1, a front arch wall 2, a rear arch wall 3, and a flue 4.

[0064] Specifically, the incineration grate 1 includes a drying section grate 101 that can be adjusted independently in movement, a combustion section grate 102 that can be adjusted independently in movement, and a burnout section grate 103 that can be adjusted independently in movement. The drying section grate 101, the combustion section grate 102, and the burnout section grate 103 are all arranged in an inclined shape with the front high and the rear low and are arranged in sequence from front to back. The rear end of the drying section grate 101 is higher than the front end of the combustion section grate 102, and the rear end of the combustion section grate 102 is higher than the front end of the burnout section grate 103. Primary air inlets 5 for air intake from bottom to top are provided on the drying section grate 101, the combustion section grate 102, and the burnout section grate 103.

[0065] The front arch wall 2 is located above the drying section grate 101 and projects completely to cover the drying section grate 101 in the vertical direction. Specifically, the front end of the front arch wall 2 projects to coincide with the front end of the drying section grate 101 in the vertical direction. The rear end of the front arch wall 2 is located above the rear of the rear end of the drying section grate 101, and the front arch wall 2 is arranged horizontally.

[0066] The rear arch wall 3 is arranged in an inclined shape with the front high and the rear low. The angle between the rear arch wall 3 and the horizontal plane is 41°. The rear arch wall 3 is located above the grate 103 in the burnout section and the grate 102 in the combustion section. A part of the rear arch wall 3 projects completely over the grate 103 in the vertical direction, and the remaining part of the rear arch wall 3 projects over half of the area of the grate 102 in the combustion section in the vertical direction. The front end of the rear arch wall 3 is higher than the rear end of the front arch wall 2, and the rear end of the rear arch wall 3 is located above and behind the rear end of the grate 103 in the burnout section.

[0067] The flue 4 is arranged vertically and is connected between the rear end of the front arch wall 2 and the front end of the rear arch wall 3.

[0068] The simulation experiment results of the waste incineration grate furnace 1000 in Specific Example 2 are (as shown in Figure 5): From Figure 5 It can be seen that the results of the temperature distribution, velocity distribution, and product concentration distribution show that compared with the existing furnace type design, Design Three enhances the re-radiation effect of the front arch, extends the residence time of the high-temperature flue gas in the furnace, greatly enhances the drying ability of the waste, and this structure is very beneficial to the drying and pyrolysis of high-moisture waste, avoiding a large amount of moisture entering the combustion section and causing the combustion point to move backward.

[0069] It should be noted that for Specific Example 1 and Specific Example 2, in view of the characteristics of high moisture content of domestic waste in China, the needs of different waste incineration conditions in various regions can be met. For example, domestic waste with a high moisture content can use the waste incineration grate furnace in Specific Example 1, and domestic waste with an even higher moisture content can use the waste incineration grate furnace in Specific Example 2.

[0070] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0071] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A waste incineration grate furnace, characterized in that, Comprising: An incinerator grate, the incinerator grate includes a drying section grate, a combustion section grate, and an afterburning section grate that can be adjusted for movement independently. The drying section grate, the combustion section grate, and the afterburning section grate are all arranged in an inclined shape with the front end higher than the rear end and are arranged in sequence from front to back. The rear end of the drying section grate is higher than the front end of the combustion section grate, and the rear end of the combustion section grate is higher than the front end of the afterburning section grate; on the drying section grate, the combustion section grate, and the afterburning section grate, there are all primary air inlets for air to enter from bottom to top. A front arch wall, the front arch wall is located above the drying section grate and its projection in the vertical direction completely covers the drying section grate. A rear arch wall, the rear arch wall is arranged in an inclined shape with the front end higher than the rear end, the included angle between the rear arch wall and the horizontal plane is 39° - 43°, the rear arch wall is located above the afterburning section grate and the combustion section grate, a part of the rear arch wall's projection in the vertical direction completely covers the afterburning section grate, and the remaining part of the rear arch wall's projection in the vertical direction covers 1 / 3 to 1 / 2 of the area of the combustion section grate. A flue, the flue is arranged vertically and is connected between the rear end of the front arch wall and the front end of the rear arch wall. The front end of the front arch wall's projection in the vertical direction coincides with the front end of the drying section grate, and the rear end of the front arch wall is located behind and above the rear end of the drying section grate. The front arch wall is arranged in an inclined shape with the front end lower than the rear end or in a horizontal shape, and the included angle between the front arch wall and the horizontal plane is 0° - 5° or 28° - 32°. When the included angle between the front arch wall and the horizontal plane is 28° - 32°, the front end of the rear arch wall is at the same height as the rear end of the front arch wall. The included angle between the front arch wall and the horizontal plane is 0° - 5°, and the front end of the rear arch wall is higher than the rear end of the front arch wall. The rear end of the rear arch wall is located behind and above the rear end of the afterburning section grate.

2. The waste incineration grate furnace according to claim 1, wherein, At the connection part between the front arch wall and the flue and at the connection between the rear arch wall and the flue, there are secondary air inlets.

3. The waste incineration grate furnace according to claim 1, characterized in that, The drying section grate, the combustion section grate, and the afterburning section grate all include a plurality of movement modules arranged in sequence in the left - right direction, which are used to push the garbage on the movement modules to move from the front high place to the rear low place.

4. The waste incineration grate furnace according to claim 3, characterized in that, The gaps between two adjacent movement modules form the primary air inlets.

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