Garbage incinerator combustion system for blending combustion of sludge

Abstract

The garbage incinerator combustion system comprises a hearth, a primary air distribution cycle and a secondary air distribution cycle, the primary air distribution cycle is characterized in that a smoke suction opening is formed in the side wall of an incinerator wall above the hearth and connected with a first ejector, a primary fan is connected with the first ejector, and a secondary fan is connected with the secondary ejector. An outlet of the first ejector is connected with a primary air header pipe; the primary air header pipe is connected with a plurality of primary air inlets in the lower part of the hearth through a plurality of output ports; according to the secondary air distribution circulation, a steam pocket arranged above the hearth is connected with a second ejector through a high-pressure steam pipe, an outlet of the second ejector is connected with a secondary air inlet in the side wall of a rear arch outlet of the hearth, and a secondary fan is connected with the second ejector. The device has the beneficial effects that the ignition condition of the solid waste can be obviously improved, the efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of incinerators, in particular to a garbage incinerator combustion system for mixing and burning sludge. Background Art

[0002] Currently, the primary effective method for harmless sludge treatment is incineration, but this requires the sludge's moisture content to be reduced to below 25%. However, mechanical dehydration within sewage treatment plants currently reduces the sludge's moisture content to a maximum of 65%, resulting in a very low calorific value and difficulty in igniting and burning out. Therefore, improvements must be made to the combustion structure of traditional waste incinerators to ensure that the sludge can be fully mixed with the waste for combustion, thus achieving harmless sludge treatment—killing two birds with one stone.

[0003] A Chinese utility model application, authorized with publication number CN219656083U, discloses a sludge and solid waste mixed combustion system, comprising a waste incinerator, a high-temperature air preheater, a low-temperature air preheater, a deaerator, a biomass gasifier, a vacuum dryer, and an ejector. The biomass gas outlet of the biomass gasifier is connected to the fuel inlet of an auxiliary burner mounted on the waste incinerator. The flue gas outlet of the waste incinerator is connected to the first inlet of the mixer via a second blower. The outlet of the low-temperature air preheater is provided with a branch connected to the second inlet of the mixer, and the outlet of the mixer is connected to the biomass gasifier. This technical solution has the following beneficial effects: it effectively reduces the energy consumption of the vacuum drying system, ensures the stable combustion of low-calorific-value domestic waste and sludge, and produces flue gas with extremely low dust and nitrogen oxide content.

[0004] However, the technical solution utilizes a biomass gasifier, which is expensive and difficult to widely implement. Without a biomass gasifier, the sludge itself has a high moisture content, making it difficult to burn and has a low calorific value. Simply dehydrating the sludge and feeding it into a waste incinerator would make combustion difficult due to its low calorific value. Therefore, improvements to the incinerator's combustion structure are necessary to ensure stable combustion. Furthermore, the above-mentioned technical solution uses high-pressure steam to heat the air, which is costly and urgently needs improvement. Utility Model Content

[0005] The purpose of this utility model is to address the deficiencies of the prior art as described above and to provide a garbage incinerator combustion system for burning sludge, which is used to improve the combustion structure of the existing garbage incinerator to facilitate the ignition and burning of low calorific value fuels, improve combustion efficiency, and reduce dust emissions.

[0006] The technical solution adopted by the present invention is: a combustion system of a garbage incinerator for burning sludge, comprising a furnace 1, a primary air distribution cycle and a secondary air distribution cycle, the furnace 1 is provided with a primary air inlet and a secondary air inlet, the primary air distribution cycle comprises a first ejector 6, a primary fan 5 and a primary air main 7, a circulating flue gas suction port is provided on the side wall of the upper furnace wall of the furnace 1 and is connected to the first ejector 6, the primary fan 5 is connected to the first ejector 6, the outlet of the first ejector 6 is connected to the primary air main 7, and the primary air main 7 is connected to several primary air inlets at the lower part of the furnace 1 through several output ports; the secondary air distribution cycle comprises a second ejector 3, a steam drum 2, and a secondary fan 4, a steam drum 2 is provided above the furnace 1 and is connected to the second ejector 3 through a high-pressure steam pipe, the outlet of the second ejector 3 is connected to the secondary air inlet of the side wall of the rear arch outlet of the furnace 1, and the secondary fan 4 is connected to the second ejector 3.

[0007] Several through holes on the primary air main pipe 7 form an output port, and the output port is connected to the primary air inlet through a pipeline, and a gas regulating valve (not shown) is installed in the pipeline.

[0008] The secondary air inlets are circular, with 8-10 in number and a diameter of 110 mm.

[0009] The primary air blower 5 is a high-pressure Roots blower.

[0010] The secondary air blower 4 is a high-pressure Roots blower.

[0011] The present application first extracts the high-temperature flue gas in the furnace and mixes it with cold air in the ejector 6 to form 160°C hot air. There is no need to use high-pressure steam as a heat source, and the application cost is greatly reduced; secondly, due to the addition of some high-temperature flue gas, the oxygen content in the 160°C combustion-supporting hot air drops to about 18%, and the emission of nitrogen oxides generated during combustion is greatly reduced; finally, through the ejection effect of high-pressure steam, a fast-ejecting secondary air is added to the traditional garbage incinerator. On the one hand, it can push the flame in the high-temperature zone at the rear of the garbage incinerator to the front, improving the ignition conditions of the fuel; it can also form a large-scale reflux of high-temperature flue gas, greatly increasing the residence time of the flue gas in the furnace arch area, ensuring that the fuel is burned out; allowing the high-temperature flue gas to flow back into the furnace to heat the combusted objects multiple times, and using the residual heat of the flue gas to make the combustion process more complete.

[0012] The technical solution of this utility model is a transformation technology based on the combustion structure of the traditional garbage incinerator. It does not require the addition of a biomass gasification furnace. It can effectively incinerate the mixture of sludge and domestic garbage, fully utilize the energy value of the sludge, and turn biomass and domestic sludge resources into treasure, truly achieving efficiency improvement while being environmentally friendly, and has great promotion and application value.

[0013] In general, compared with the existing technology, the beneficial effects of the present invention are as follows: in terms of economic benefits, it can significantly improve the processing efficiency of solid waste disposal enterprises, reduce the investment costs of technological improvements of enterprises, and thus enhance the region's resource recycling and utilization capabilities; in terms of social benefits, it can significantly reduce pollutant emissions and reduce damage to the health of the surrounding public. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is an L-shaped flow flame diagram of the prior art;

[0016] Figure 2 It is an α-shaped flowing flame formed after improvement of the utility model;

[0017] Figure 3 This is a schematic diagram of the system structure of the utility model. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the embodiments. It should be noted that the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without inventive effort are within the scope of protection of the present invention. In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance or to implicitly specify the number of the technical features indicated. Therefore, features designated "first" or "second" may explicitly or implicitly include one or more of the aforementioned features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a communication between the two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Among them, Figure 1 and Figure 2 The front arch is on the left side of the center and the rear arch is on the right side.

[0019] A waste incinerator combustion system for burning sludge, such as Figure 3As shown, it includes a furnace 1, a primary air distribution cycle and a secondary air distribution cycle. The furnace 1 is provided with a primary air inlet and a secondary air inlet. The primary air distribution cycle includes a first ejector 6, a primary fan 5 and a primary air main 7. A flue gas suction port is provided on the side wall of the furnace wall above the furnace 1 and is connected to the low-pressure inlet of the first ejector 6 through a pipeline. The primary fan 5 is connected to the high-pressure inlet of the first ejector 6 through a pipeline. The outlet of the first ejector 6 is connected to the primary air main 7. The primary air main 7 is connected to several primary air inlets at the lower part of the furnace 1 through several output ports. The secondary air distribution cycle includes a second ejector 3, a steam drum 2 and a secondary fan 4. The steam drum 2 provided above the furnace 1 is connected to the high-pressure inlet of the second ejector 3 through a high-pressure steam pipe. The outlet of the second ejector 3 is connected to the secondary air inlet of the side wall of the rear arch outlet of the furnace 1, and the secondary fan 4 is connected to the low-pressure inlet of the second ejector 3. Several through holes on the primary air main pipe 7 form an output port, and the output port is connected to the primary air inlet through a pipeline. A gas regulating valve (not shown) is installed in the pipeline to adjust the flow of each pipeline.

[0020] This application fully utilizes the thermal energy of the high-temperature flue gas in the furnace, improving the ignition and combustion functions while reducing the content of nitrogen oxides in the exhaust flue gas, killing two birds with one stone. Among them, the primary air blower 5 adopts a high-pressure Roots blower, which draws back the 1000-degree Celsius high-temperature flue gas (15% by mass) from the furnace through the first ejector 6, mixes it with cold air (85% by mass) in the first ejector 6 to form hot gas above 160 degrees Celsius, and then enters the primary air main 7 (no high-pressure steam heating is required, saving energy). This can improve the ignition and combustion performance of the garbage fuel. At the same time, due to the addition of flue gas, the oxygen content is reduced, and the content of nitrogen oxides in the flue gas is also significantly reduced, with significant environmental performance.

[0021] A steam drum 2 is provided on the upper part of the furnace 1. High-pressure steam (1 / 3 by mass) with a pressure of 40 kg and a temperature of 300 degrees Celsius is drawn out of the steam drum 2 through a high-pressure steam pipe and introduced into the second ejector 3. The cold air (2 / 3 by mass) provided by the secondary fan 4 is sucked in and mixed in the second ejector 3 to form high-speed hot air at 100 degrees Celsius as the secondary air of the garbage furnace. The air is sprayed into the furnace at high speed. On the one hand, it can push the flame in the high-temperature zone at the rear of the garbage furnace to the front, improving the ignition conditions of the fuel; on the other hand, it can form a large-scale reflux of high-temperature flue gas, strive to form an α-shaped flowing flame, increase the residence time of the flue gas in the furnace arch area, and ensure that the fuel is burned out.

[0022] The utility model changes the air distribution mode of the garbage incinerator and increases the secondary air ejected at high speed in the furnace 1. It can further transform the traditional L-shaped flue gas path of the garbage incinerator (such as Figure 1 As shown) is modified to an α-shaped path (as shown below Figure 2The resulting novel incinerator design is better suited to burning a mixture of dewatered sludge and municipal waste with a low calorific value.

[0023] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste incinerator combustion system for burning sludge, characterized in that: It includes a furnace, a primary air distribution cycle and a secondary air distribution cycle. The furnace is provided with a primary air inlet and a secondary air inlet. The primary air distribution cycle includes a first ejector, a primary fan and a primary air main. A circulating flue gas suction port is provided on the side wall of the upper furnace wall and is connected to the first ejector. The primary fan is connected to the first ejector. The outlet of the first ejector is connected to the primary air main. The primary air main is connected to several primary air inlets at the lower part of the furnace through several output ports. The secondary air distribution cycle includes a second ejector, a steam drum and a secondary fan. The steam drum provided above the furnace is connected to the second ejector through a high-pressure steam pipe. The outlet of the second ejector is connected to the secondary air inlet on the side wall of the furnace rear arch outlet. The secondary fan is connected to the second ejector.

2. The waste incinerator combustion system for co-burning sludge according to claim 1, characterized in that: A plurality of through holes on the primary air main pipe form an output port, and the output port is connected to the primary air inlet through a pipeline, and a gas regulating valve is installed in the pipeline.

3. The waste incinerator combustion system for co-burning sludge according to claim 2, characterized in that: The secondary air inlets are circular, with 8-10 in number and a diameter of 110 mm.

4. The waste incinerator combustion system for co-burning sludge according to claim 1, characterized in that: The primary air blower adopts a high-pressure Roots blower.

5. The waste incinerator combustion system for co-burning sludge according to claim 1, characterized in that: The secondary air blower adopts a high-pressure Roots blower.

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