A waste incinerator

Abstract

The application discloses a waste incinerator and relates to the technical field of waste incineration treatment. The waste incinerator comprises an incinerator body, an intermediate arch and a recirculation flue gas nozzle. The intermediate arch is arranged in a hearth of the incinerator body and is located between a front arch, a rear arch and a combustion section grate. A first flue gas passage is formed between the intermediate arch and the front arch, and a second flue gas passage is formed between the intermediate arch and the rear arch. High-temperature flue gas in the hearth of the incinerator body flows through the first flue gas passage and the second flue gas passage, converges above the intermediate arch and then enters a flue. The recirculation flue gas nozzle is arranged at the bottom of the intermediate arch and is used for spraying low-temperature flue gas into the hearth of the incinerator body. At least one group of recirculation flue gas nozzles faces the front side of the intermediate arch, and at least one group of recirculation flue gas nozzles faces the rear side of the intermediate arch. The intermediate arch arranged in the hearth prevents coking, increases disturbance of the high-temperature flue gas, promotes mixing of volatile components and oxygen and improves combustion efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste incineration treatment, in particular to a waste incinerator. BACKGROUND

[0002] The waste incinerator is a device for incinerating waste, and the main types include mechanical grate incinerator, fluidized bed incinerator and rotary kiln incinerator.

[0003] Among them, the mechanical grate incinerator is provided with a group of stepped grates at the bottom of the hearth, and the waste is fed from the upper part of the grate. With the movement of the grate, the waste on the grate passes through the drying stage, the combustion stage and the burnout stage in turn. In this process, the air system under the grate will provide the appropriate amount of air to make the waste burn evenly.

[0004] However, the high-temperature flue gas generated by the combustion stage of the above-mentioned incinerator directly flows to the flue through the hearth, and the oxygen in it cannot effectively mix with the volatile matter (CO, CH4, etc.) generated by combustion, which is easy to cause the tail CO to exceed the standard. SUMMARY

[0005] The purpose of the present application is to provide a waste incinerator to solve the problems existing in the above-mentioned related technology. By setting an anti-coking intermediate arch in the hearth, the disturbance of high-temperature flue gas can be increased, the mixing of volatile matter and oxygen can be promoted, and the combustion efficiency can be improved.

[0006] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0007] The application provides a waste incinerator, which comprises an incinerator body, a waste feeding port arranged at the front end of the hearth of the incinerator body, a slag discharging port arranged at the rear end of the hearth of the incinerator body, a front arch arranged at the top of the hearth of the incinerator body and close to the waste feeding port, a rear arch arranged at the top of the hearth of the incinerator body and close to the slag discharging port, and a flue arranged at the top of the hearth of the incinerator body and between the front arch and the rear arch; the bottom of the hearth of the incinerator body is sequentially provided with a drying section grate, a combustion section grate and a burnout section grate from front to back; the application further comprises an intermediate arch and a recirculation flue gas nozzle, the intermediate arch is arranged in the hearth of the incinerator body and between the front arch, the rear arch and the combustion section grate, a first flue gas channel can be formed between the intermediate arch and the front arch, a second flue gas channel can be formed between the intermediate arch and the rear arch, so that the high-temperature flue gas in the hearth of the incinerator body flows through the first flue gas channel and the second flue gas channel, and then converges above the intermediate arch and enters the flue; the recirculation flue gas nozzle is arranged at the bottom of the intermediate arch, the recirculation flue gas nozzle is used for spraying low-temperature flue gas into the hearth of the incinerator body, and at least two groups of the recirculation flue gas nozzle are arranged, wherein at least one group of the recirculation flue gas nozzle is directed to the front side of the intermediate arch, and at least one group of the recirculation flue gas nozzle is directed to the rear side of the intermediate arch.

[0008] Preferably, the intermediate arch is a rectangular plate structure, and the length direction of the intermediate arch is perpendicular to the side wall of the incinerator body.

[0009] Preferably, the intermediate arch is arranged to be inclined downward from front to back.

[0010] Preferably, the angle between the intermediate arch and the horizontal plane is 10°-20°.

[0011] Preferably, the distance between the front side of the intermediate arch and the front arch is greater than or equal to 1.3 m, the distance between the rear side of the intermediate arch and the rear arch is greater than or equal to 1.3 m, and the distance between the rear side of the intermediate arch and the combustion section grate is greater than or equal to 1.5 m.

[0012] Preferably, each group of the recirculation flue gas nozzle comprises a plurality of branch pipes which are uniformly distributed along the length direction of the intermediate arch.

[0013] Preferably, the angle between the branch pipe directed to the front side of the intermediate arch and the intermediate arch is 20°-45°.

[0014] Preferably, the angle between the branch pipe directed to the rear side of the intermediate arch and the intermediate arch is 20°-45°.

[0015] Preferably, the front end of the hearth of the incinerator body is further provided with a garbage pusher, and the garbage pusher is located below the garbage inlet.

[0016] Preferably, the intermediate arch is further provided with a water-cooled wall.

[0017] The present application has the following technical effects relative to the related art:

[0018] The garbage incinerator provided by the present application comprises an incinerator body, an intermediate arch and a recirculated flue gas nozzle, the intermediate arch is arranged in the hearth of the incinerator body and located between the front arch, the rear arch and the combustion section grate, and the intermediate arch and the front arch can form a first flue gas passage, and the intermediate arch and the rear arch can form a second flue gas passage, so that when the high-temperature flue gas in the hearth of the incinerator body flows through the intermediate arch, part of the high-temperature flue gas passes through the first flue gas passage, and the other part of the high-temperature flue gas passes through the second flue gas passage, then the two parts of the high-temperature flue gas converge above the intermediate arch and then enter the flue, greatly increasing the disturbance of the high-temperature flue gas, promoting the mixing of the volatile components and oxygen therein, improving the combustion efficiency, reducing the air excess coefficient from 1.4-1.6 to 1.3-1.4, and improving the boiler efficiency by more than 0.5%; meanwhile, at least two groups of recirculated flue gas nozzles are arranged at the bottom of the intermediate arch, at least one group of the recirculated flue gas nozzles faces the front side of the intermediate arch, and at least one group of the recirculated flue gas nozzles faces the rear side of the intermediate arch, low-temperature flue gas is sprayed into the front side and the rear side of the intermediate arch through the two groups of recirculated flue gas nozzles, respectively, the jet flow of the two groups of recirculated flue gas nozzles flows through the front side and the rear side of the intermediate arch, respectively, the temperature of the flue gas on the front side and the rear side of the intermediate arch is reduced, and thus coking and blockage of the intermediate arch are effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 The schematic diagram of the garbage incinerator provided by the present application;

[0021] Figure 2 The simulation diagram of the flue gas flow effect in the garbage incinerator provided by the present application.

[0022] In the figure: 1, the hearth of the incinerator body; 2, the garbage inlet; 3, the slag outlet; 4, the front arch; 5, the rear arch; 6, the flue; 7, the drying section grate; 8, the combustion section grate; 9, the burnout section grate; 10, the garbage pusher; 11, the intermediate arch; 12, the recirculated flue gas nozzle. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a waste incinerator to solve the problems existing in related technologies. By setting an anti-coking intermediate arch in the furnace, the turbulence of high-temperature flue gas can be increased, promoting the mixing of volatiles and oxygen and improving combustion efficiency.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, this embodiment provides a waste incinerator, including an incinerator body. A waste inlet 2 is provided at the front end of the furnace chamber 1 of the incinerator body, and a slag outlet 3 is provided at the rear end of the furnace chamber 1. A front arch 4 is provided at the top of the furnace chamber 1 near the waste inlet 2, and a rear arch 5 is provided at the top of the furnace chamber 1 near the slag outlet 3. A flue 6 is provided at the top of the furnace chamber 1 between the front arch 4 and the rear arch 5. The bottom of the furnace chamber 1 of the incinerator body extends from front to back... The furnace body is provided with a drying section grate 7, a combustion section grate 8, and a burnout section grate 9 in sequence. Specifically, in this embodiment, the furnace chamber 1 of the incinerator body is also provided with a waste pusher 10 at the front end. The waste pusher 10 is located below the waste inlet 2. When in use, the waste pusher 10 can push the waste falling from the waste inlet 2 onto the drying section grate 7. With the alternating movement of the drying section grate 7, the combustion section grate 8, and the burnout section grate 9, the waste passes through the drying stage, the combustion stage, and the burnout stage in sequence, and is then discharged from the slag outlet 3.

[0027] In the embodiment, the waste incinerator further comprises an intermediate arch 11 and a recirculation flue gas nozzle 12, the intermediate arch 11 is arranged in the hearth 1 of the incinerator body and located between the front arch 4, the rear arch 5 and the combustion section grate 8, and a first flue gas passage can be formed between the intermediate arch 11 and the front arch 4, and a second flue gas passage can be formed between the intermediate arch 11 and the rear arch 5, so that the high-temperature flue gas in the hearth 1 of the incinerator body flows through the first flue gas passage and the second flue gas passage, and then converges above the intermediate arch 11 and enters the flue 6, which greatly increases the disturbance of the high-temperature flue gas, promotes the mixing of the volatile matter and oxygen therein, improves the combustion efficiency, reduces the air excess coefficient from 1.4-1.6 to 1.3-1.4, and improves the boiler efficiency by more than 0.5%.

[0028] In the embodiment, the recirculation flue gas nozzle 12 is arranged at the bottom of the intermediate arch 11, the recirculation flue gas nozzle 12 is used to spray low-temperature flue gas into the hearth 1 of the incinerator body, and at least two groups of recirculation flue gas nozzles 12 are arranged, wherein at least one group of recirculation flue gas nozzles 12 faces the front side of the intermediate arch 11, and at least one group of recirculation flue gas nozzles 12 faces the rear side of the intermediate arch 11, and the gas flow of the two groups of recirculation flue gas nozzles 12 flows through the front and rear sides of the intermediate arch 11 respectively, as shown in Figure 2 The embodiment provides a waste incinerator suitable for solid waste incineration, and particularly suitable for efficient and low-pollution incineration of household garbage.

[0029] It should be noted that the source of the flue gas of the recirculation flue gas nozzle 12 in the embodiment is low-temperature flue gas discharged from the tail end of a subsequent flue gas purification device after purification and dust removal, and the temperature of the low-temperature flue gas is 160-300℃, which is much lower than the temperature (900-1100℃) of the high-temperature flue gas in the waste incinerator; the flow rate of the low-temperature flue gas sprayed by the recirculation flue gas nozzle 12 is 10-20 m / s.

[0030] In the embodiment, the intermediate arch 11 is in a rectangular plate shape, and the length direction of the intermediate arch 11 is perpendicular to the side wall of the incinerator body (i.e. the length direction of the intermediate arch 11 is Figure 1 perpendicular to the direction of the paper plane).

[0031] In the embodiment, the intermediate arch 11 is arranged downwardly inclined from front to rear.

[0032] Further, the angle between the intermediate arch 11 and the horizontal plane is 10-20°, and in the embodiment, the angle is preferably 15°.

[0033] In the embodiment, the distance between the front side of the intermediate arch 11 and the front arch 4 is greater than or equal to 1.3 m, the distance between the back side of the intermediate arch 11 and the back arch 5 is greater than or equal to 1.3 m, and the distance between the back side of the intermediate arch 11 and the combustion section grate 8 is greater than or equal to 1.5 m.

[0034] In the embodiment, each group of the recirculated flue gas nozzles 12 comprises a plurality of branch pipes which are uniformly distributed along the length direction of the intermediate arch 11.

[0035] Further, the included angle between the branch pipe towards the front side of the intermediate arch 11 and the intermediate arch 11 is 20°-45°, and the included angle between the branch pipe towards the back side of the intermediate arch 11 and the intermediate arch 11 is 20°-45°.

[0036] In the embodiment, a water-cooled wall is further arranged on the intermediate arch 11, which enhances the cooling effect of the flue gas around the intermediate arch 11 and helps to prevent coking and blockage of the intermediate arch 11.

[0037] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above embodiment is only used to help understand the method of the present application and its core idea; meanwhile, for the general skilled in the art, the specific implementation manners and application range will be changed according to the idea of the present application. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A waste incinerator, comprising an incinerator body, wherein a waste inlet is provided at the front end of the furnace chamber of the incinerator body, a slag outlet is provided at the rear end of the furnace chamber of the incinerator body, a front arch is provided at the top of the furnace chamber near the waste inlet, a rear arch is provided at the top of the furnace chamber near the slag outlet, and a flue is provided at the top of the furnace chamber between the front arch and the rear arch; the bottom of the furnace chamber of the incinerator body is provided with a drying section grate, a combustion section grate, and a burnout section grate arranged sequentially from front to back; characterized in that: It also includes an intermediate arch and recirculating flue gas nozzles. The intermediate arch is disposed within the furnace of the incinerator body and is located between the front arch, the rear arch, and the combustion section grate. The intermediate arch is disposed above the combustion section grate and below the flue. A first flue gas passage can be formed between the intermediate arch and the front arch, and a second flue gas passage can be formed between the intermediate arch and the rear arch, so that the high-temperature flue gas in the furnace of the incinerator body flows through the first flue gas passage and the second flue gas passage, and converges above the intermediate arch before entering the flue. The recirculating flue gas nozzles are disposed at the bottom of the intermediate arch and are used to inject low-temperature flue gas into the furnace of the incinerator body. At least two sets of recirculating flue gas nozzles are provided, wherein at least one set of recirculating flue gas nozzles faces the front side of the intermediate arch, and at least one set of recirculating flue gas nozzles faces the rear side of the intermediate arch. The intermediate arch is inclined downward from front to back; the angle between the intermediate arch and the horizontal plane is 10°-20°.

2. The waste incinerator according to claim 1, characterized in that: The intermediate arch is a rectangular plate structure, and the length direction of the intermediate arch is perpendicular to the side wall of the incinerator body.

3. The waste incinerator according to claim 1, characterized in that: The distance between the front side of the intermediate arch and the front arch is greater than or equal to 1.3m, the distance between the rear side of the intermediate arch and the rear arch is greater than or equal to 1.3m, and the distance between the rear side of the intermediate arch and the grate of the combustion section is greater than or equal to 1.5m.

4. The waste incinerator according to claim 2, characterized in that: Each group of recirculated flue gas nozzles includes multiple branch pipes evenly distributed along the length of the intermediate arch.

5. The waste incinerator according to claim 4, characterized in that: The angle between the branch pipe facing the front side of the intermediate arch and the intermediate arch is 20°-45°.

6. The waste incinerator according to claim 4, characterized in that: The angle between the branch pipe facing the rear side of the intermediate arch and the intermediate arch is 20°-45°.

7. The waste incinerator according to claim 1, characterized in that: The incinerator body is equipped with a waste pusher at the front end of the furnace chamber, and the waste pusher is located below the waste inlet.

8. The waste incinerator according to any one of claims 1-7, characterized in that: A water-cooled wall is also provided on the intermediate arch.

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