A mixing feeding chamber and feeding process of a solid waste disposal rotary furnace

Abstract

The present invention discloses a mixing feeding chamber and feeding process for a solid waste disposal rotary furnace. The mixing feeding chamber comprises a raw material feeding chamber (3) and a solid waste feeding chamber (4). The raw material feeding chamber (3) is connected to a tertiary air branch pipe (1). A solid waste conveying mechanism is provided at the top of the solid waste feeding chamber (4). The solid waste conveying mechanism comprises a screw conveyor 1 (5) and a screw conveyor 2 (6). The feeding end of the screw conveyor 1 (5) is provided with a solid waste feeding port (12). The discharging end of the screw conveyor 1 (5) is connected to the feeding end of the screw conveyor 2 (6), and the discharging end of the screw conveyor 2 (6) is connected to the feeding end of the solid waste feeding chamber (4). The present invention solves the feeding problem of large-sized solid waste, and can utilize the self-extrusion effect of the material to achieve stable feeding and forced sealing, thereby reducing the amount of cold air mixed in during the solid waste feeding process.

Description

Technical Field

[0001] The present invention relates to the field of solid waste disposal, and in particular to a mixing feeding chamber and feeding process of a solid waste disposal rotary furnace. Background Art

[0002] There are various solid waste disposal devices on the market, such as hot plate furnaces, grate furnaces, etc. Hot plate furnaces and grate furnaces can be combined with cement kilns to dispose of solid waste.

[0003] The general process for the combined treatment of solid waste by grate furnaces and cement kilns is that the garbage is transported to the factory by car and then unloaded into the garbage storage pit in the unloading hall. It is then piled up in sections by a crane grab bucket. After 5 to 7 days of fermentation and removal of some moisture, it can be fed into the mechanical grate furnace for incineration. The solid waste is pushed by the moving grate on the inclined grate, and the primary air preheated to 200 to 250°C is blown upward from the bottom, which slowly dries, heats up, and ignites the solid waste. The grate combustion temperature is adjusted by controlling the proportion of combustion-supporting air.

[0004] The collaborative solid waste treatment method of a hot plate furnace and cement kiln is the primary technology currently employed by China Resources Cement. Raw urban and rural domestic waste enters the plant, undergoes shredding, storage, aerobic fermentation, and extrusion dehydration. It is then metered and fed into the hot plate furnace via a tubular belt conveyor. It is ignited in a high-temperature tertiary air environment at approximately 900°C, reaching incineration temperatures of 1050°C to 1100°C.

[0005] However, approximately 5-8% of industrial solid waste is difficult to crush, and 0.5-2% of domestic waste is large, irregular-shaped waste. The existing method of using cement kilns to co-dispose of solid waste cannot effectively solve this part of solid waste, which causes inconvenience.

[0006] In general, most current solid waste incineration processes utilize direct feeding of waste into the incineration system for high-temperature degradation. This approach offers the advantages of a simple process flow, ease of operation, and minimal modification and expense. A typical solution involves pumping high-water sludge or wastewater into the decomposition furnace for incineration. However, its main disadvantage is that it only processes a limited number of solid waste types, failing to meet the increasingly complex waste disposal needs of society. For example, it cannot effectively handle solid granular waste or large-sized solid waste. Summary of the Invention

[0007] The purpose of the present invention is to provide a mixing feeding chamber and feeding process for a solid waste disposal cyclone furnace to solve the technical problem that the types of solid waste treated in the existing technology are relatively single and cannot meet the increasingly complex waste disposal requirements in society, such as solid granular garbage, large-sized solid waste, etc., which cannot be effectively disposed of.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] The present invention provides a mixing feeding chamber of a solid waste disposal cyclone furnace, comprising a raw material feeding chamber and a solid waste feeding chamber, wherein the raw material feeding chamber is connected to a tertiary air branch pipe, one side of the solid waste feeding chamber is connected to the air inlet end of the tertiary air branch pipe, and the other side of the solid waste feeding chamber is provided with an outlet; a solid waste conveying mechanism is provided at the top of the solid waste feeding chamber; the solid waste conveying mechanism comprises a screw conveyor 1 and a screw conveyor 2, the feed end of the screw conveyor 1 is provided with a solid waste feed port, the discharge end of the screw conveyor 1 is connected to the feed end of the screw conveyor 2, and the discharge end of the screw conveyor 2 is connected to the feed end of the solid waste feeding chamber.

[0010] Furthermore, the inner diameter of the solid waste feeding chamber is 800-1200 mm.

[0011] Furthermore, the raw material feeding chamber and the solid waste feeding chamber are arranged in sequence along the flow direction of the gas in the tertiary air branch pipe.

[0012] Furthermore, the tertiary air branch pipe is arranged to be inclined downward along the direction of gas flow therein.

[0013] Furthermore, the first screw conveyor is a horizontal screw conveyor.

[0014] Furthermore, the second screw conveyor is a vertical screw conveyor.

[0015] Furthermore, the tertiary air branch pipe is provided with an electric gate valve, which is located on the air inlet side of the raw material feeding chamber.

[0016] The present invention provides a feeding process for a solid waste disposal cyclone furnace, in which solid waste enters the solid waste feeding chamber at room temperature, and raw meal enters the raw meal feeding chamber at room temperature; the temperature of the air in the tertiary air branch pipe entering the solid waste feeding chamber is controlled to be greater than 850°C, the negative pressure is less than -300Pa, and the wind speed is 25-30m / s.

[0017] Furthermore, the raw meal comprises the following components by weight: 12.69-12.72 parts of silicon dioxide, 3.08-3.05 parts of aluminum oxide; 2.58 parts of iron oxide; 42.99-43.04 parts of calcium oxide; 0.93-0.99 parts of magnesium oxide; and a KH value of 1.041-1.042; an SM value of 2.24-2.26; and an IM value of 1.18-1.19.

[0018] Based on the above technical solution, the embodiments of the present invention can produce at least the following technical effects:

[0019] (1) The present invention provides a mixing feeding chamber and feeding process for a solid waste disposal rotary furnace. During feeding, raw materials are added along the tertiary air flow path to force the raw materials to disperse. After entering the rotary furnace, the raw materials decompose and absorb heat. The purpose is to control the temperature in the rotary furnace to be less than 1100°C. If the temperature in the rotary furnace is too high (>1150°C), the raw materials are fed in to decompose calcium carbonate to absorb heat and lower the temperature, thereby avoiding high-temperature melting and sintering after the garbage is burned, so that the garbage incineration can proceed smoothly.

[0020] (2) The present invention provides a mixed feeding chamber and feeding process for a solid waste disposal cyclone furnace. During feeding, since the tertiary air branch pipe is arranged obliquely downward along the direction of gas flow, the high-temperature tertiary air enters the cyclone furnace obliquely downward along the ramp. The solid waste falling from the top of the solid waste feeding chamber is swept by the tertiary air and is discharged under a large turbulent field (Reynolds number Re>5×10 5 ) under the condition that the dehydration, drying, pyrolysis and ignition processes of the solid waste feeding process can be optimized; the solid waste enters the feeding chamber at room temperature, and the flow field distribution is that the upper layer is room temperature solid waste, and the lower layer is high-temperature tertiary air, which can realize forced convection heat exchange. The temperature of the original solid waste fed into the solid waste feeding chamber is <50℃. After encountering the high-temperature tertiary air (air temperature>850℃), plus the volatilization and combustion of a small amount of organic matter in the solid waste, the temperature of the solid waste after preheating and pre-combustion is >500℃. Due to the preliminary preheating of the solid waste, the solid waste can be better ignited after entering the rotary kiln.

[0021] (3) The solid waste disposal cyclone furnace mixing feeding chamber and feeding process provided by the present invention has an inner diameter of 800-1200mm, which solves the feeding problem of large-sized solid waste. The temperature of the solid waste after three-time preheating and pre-combustion at high temperature is greater than 500℃. Since the large-sized solid waste is preheated, the large-sized solid waste can be better ignited after entering the cyclone furnace, which is conducive to the full combustion of the large-sized solid waste in the cyclone furnace and cement kiln.

[0022] (4) The solid waste disposal cyclone furnace mixing feeding chamber and feeding process provided by the present invention are provided with a solid waste conveying mechanism, which includes a screw conveyor 1 and a screw conveyor 2. The feed end of the screw conveyor 1 is provided with a solid waste feed port, the discharge end of the screw conveyor 1 is connected to the feed end of the screw conveyor 2, and the discharge end of the screw conveyor 2 is connected to the feed end of the solid waste feeding chamber; when feeding, the connected screw conveyor 1 and screw conveyor 2 can utilize the self-extrusion effect of the material to achieve stable feeding and forced sealing, which can reduce the amount of cold air mixed in during the solid waste feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural diagram of embodiment 1 of the present invention;

[0024] Figure 2This is a schematic diagram of the installation of embodiment 1 of the present invention.

[0025] In the figure: 1. Tertiary air branch pipe; 2. Tertiary air duct; 3. Raw material feeding room; 4. Solid waste feeding room; 5. Screw conveyor 1; 6. Screw conveyor 2; 7. Electric gate valve; 8. Rotary furnace; 9. Decomposition furnace; 10. Motor 1; 11. Motor 2; 12. Solid waste feed port; 13. Exhaust port. DETAILED DESCRIPTION

[0026] like Figure 1 and Figure 2 As shown:

[0027] Example 1:

[0028] A mixing feeding chamber of a solid waste disposal cyclone furnace comprises a raw material feeding chamber 3 and a solid waste feeding chamber 4, wherein the raw material feeding chamber 3 is connected to a tertiary air branch pipe 1, one side of the solid waste feeding chamber 4 is connected to the air inlet end of the tertiary air branch pipe 1, and the other side of the solid waste feeding chamber 4 is provided with an outlet 13; a solid waste conveying mechanism is provided at the top of the solid waste feeding chamber 4; the solid waste conveying mechanism comprises a screw conveyor 1 5 and a screw conveyor 2 6, wherein the screw conveyor 1 5 and the screw conveyor 2 6 are driven to rotate by a motor 10 and a motor 2 11 respectively, a solid waste feed port 12 is provided at the feed end of the screw conveyor 1 5, a discharge end of the screw conveyor 1 5 is connected to the feed end of the screw conveyor 2 6, and a discharge end of the screw conveyor 2 6 is connected to the feed end of the solid waste feeding chamber 4. The mixed feeding chamber of the solid waste disposal gyratory furnace provided by the present invention adds raw material along the tertiary wind during feeding, forcing the raw material to be dispersed. After entering the gyratory furnace, the raw material decomposes and absorbs heat. The purpose is to control the temperature in the gyratory furnace to be less than 1100°C. If the temperature in the gyratory furnace is too high, >1150°C, the raw material is fed in to decompose calcium carbonate to absorb heat and lower the temperature, thereby avoiding high-temperature melting and sintering after the garbage is burned, so that the garbage incineration proceeds smoothly.

[0029] As an optional embodiment, the raw material feeding chamber 3 and the solid waste feeding chamber 4 are arranged in sequence along the flow direction of the gas in the tertiary air branch pipe 1.

[0030] As an optional embodiment, the tertiary air branch pipe 1 is arranged obliquely downward along the direction of gas flow. During feeding, since the tertiary air branch pipe 1 is arranged obliquely downward along the direction of gas flow, the high-temperature tertiary air enters the gyratory furnace along the ramp. The solid waste falling from the top of the solid waste feeding chamber 4 is swept by the tertiary air. Under the large turbulent field, the Reynolds number Re>5×10 5Under this condition, the dehydration, drying, pyrolysis and ignition processes of the solid waste feeding process can be optimized; the solid waste enters the feeding chamber at room temperature, and the flow field distribution is that the upper layer is room temperature solid waste, and the lower layer is high-temperature tertiary air, which can realize forced convection heat exchange. The temperature of the original solid waste fed into the solid waste feeding chamber 4 is <50°C, and the air temperature after encountering the high-temperature tertiary air is >850°C. In addition, a small amount of organic matter in the solid waste is volatilized and burned, and the temperature of the solid waste after preheating and pre-combustion is >500°C. Due to the preliminary preheating of the solid waste, the solid waste can be better ignited after entering the rotary furnace.

[0031] As an optional embodiment, the inner diameter of the solid waste feeding chamber 4 is 800-1200mm; the inner diameter of the solid waste feeding chamber 4 is set at 800-1200mm, which solves the feeding problem of large-sized solid waste. The temperature of the solid waste after three high-temperature preheating and pre-combustion is >500°C. Since the large-sized solid waste is preheated, the large-sized solid waste can be better ignited after entering the rotary furnace, which is conducive to the full combustion of large-sized solid waste in the rotary furnace and cement kiln.

[0032] As an optional embodiment, the screw conveyor 1 5 is a horizontal screw conveyor, and the screw conveyor 2 6 is a vertical screw conveyor. During feeding, the arrangement of the connected horizontal and vertical screw conveyors can utilize the self-extrusion effect of the material to achieve stable feeding and forced sealing, thereby reducing the amount of cold air introduced during the solid waste feeding process.

[0033] As an optional embodiment, the tertiary air branch pipe 1 is provided with an electric gate valve 7, located on the air inlet side of the raw meal feeding chamber 3. The opening and closing control of the electric gate valve 7 can be controlled independently or by the control system of the solid waste disposal cyclone furnace. When the mixing feeding chamber of the present invention is under maintenance, the gate valve is closed to prevent air leakage.

[0034] like Figure 2 As shown in FIG. 1 , it is an installation diagram of an embodiment of the invention, in which the rotary furnace 8 is installed on the feed side of the decomposition furnace 9 .

[0035] Example 2:

[0036] The mixed feeding chamber of the solid waste disposal cyclone furnace in Example 1 is applied, and the present invention provides a feeding process for a solid waste disposal cyclone furnace, in which solid waste enters from the solid waste feeding chamber 4 at room temperature, and raw meal enters from the raw meal feeding chamber 3 at room temperature; the temperature of the air in the tertiary air branch pipe 1 entering the solid waste feeding chamber 4 is controlled to be 1000°C, the negative pressure is -320Pa, and the wind speed is 25m / s; the temperature of the solid waste after preheating and pre-combustion reaches 500~550°C.

[0037] The raw material comprises the following components by weight: 12.72 parts of silicon dioxide, 3.05 parts of aluminum oxide, 2.58 parts of iron oxide, 43.04 parts of calcium oxide, and 0.99 parts of magnesium oxide; and the KH value is controlled to be 1.041-1.042, the SM value is 2.24-2.26, and the IM value is 1.18-1.19.

[0038] The amount of raw meal added is determined based on the heat released by the combustion of solid waste and the operating conditions of the rotary furnace. The temperature sensor and gas analyzer at the outlet of the rotary furnace are used to monitor the oxygen and carbon monoxide in the combustion exhaust gas for feedback adjustment. If the temperature is too high (>1150°C), raw meal is fed in to decompose calcium carbonate to absorb heat and lower the temperature.

[0039] Example 3:

[0040] The mixed feeding chamber of the solid waste disposal cyclone furnace in Example 1 is applied, and the present invention provides a feeding process for a solid waste disposal cyclone furnace, in which solid waste enters from the solid waste feeding chamber 4 at room temperature, and raw meal enters from the raw meal feeding chamber 3 at room temperature; the temperature of the air in the tertiary air branch pipe 1 entering the solid waste feeding chamber 4 is controlled to be 1050°C, the negative pressure is -340Pa, and the wind speed is 28m / s; the temperature of the solid waste after preheating and pre-combustion reaches 530~580°C.

[0041] The raw material comprises the following components by weight: 12.72 parts of silicon dioxide, 3.08 parts of aluminum oxide, 2.58 parts of iron oxide, 43.04 parts of calcium oxide, and 0.93 parts of magnesium oxide; and the KH value is controlled to be 1.041-1.042, the SM value is 2.24-2.26, and the IM value is 1.18-1.19.

[0042] The amount of raw meal added is determined based on the heat released by the combustion of solid waste and the operating conditions of the rotary furnace. The temperature sensor and gas analyzer at the outlet of the rotary furnace are used to monitor the oxygen and carbon monoxide in the combustion exhaust gas for feedback adjustment. If the temperature is too high (>1150°C), raw meal is fed in to decompose calcium carbonate to absorb heat and lower the temperature.

[0043] Example 4:

[0044] The mixed feeding chamber of the solid waste disposal cyclone furnace in Example 1 is applied, and the present invention provides a feeding process for a solid waste disposal cyclone furnace, in which solid waste enters from the solid waste feeding chamber 4 at room temperature, and raw meal enters from the raw meal feeding chamber 3 at room temperature; the temperature of the air in the tertiary air branch pipe 1 entering the solid waste feeding chamber 4 is controlled to be 1100°C, the negative pressure is -360Pa, and the wind speed is 30m / s; the temperature of the solid waste after preheating and pre-combustion reaches 550~600°C.

[0045] The raw material comprises the following components by weight: 12.72 parts of silicon dioxide, 3.05 parts of aluminum oxide, 2.58 parts of iron oxide, 42.99 parts of calcium oxide, and 0.93 parts of magnesium oxide; and the KH value is controlled to be 1.041-1.042, the SM value is 2.24-2.26, and the IM value is 1.18-1.19.

[0046] The amount of raw meal added is determined based on the heat released by the combustion of solid waste and the operating conditions of the rotary furnace. The temperature sensor and gas analyzer at the outlet of the rotary furnace are used to monitor the oxygen and carbon monoxide in the combustion exhaust gas for feedback adjustment. If the temperature is too high (>1150°C), raw meal is fed in to decompose calcium carbonate to absorb heat and lower the temperature.

Claims

1. A mixing and feeding chamber of a solid waste disposal cyclone furnace, characterized by: The invention comprises a raw material feeding chamber (3) and a solid waste feeding chamber (4), wherein the raw material feeding chamber (3) is connected to the tertiary air branch pipe (1), one side of the solid waste feeding chamber (4) is connected to the air inlet end of the tertiary air branch pipe (1), and the other side of the solid waste feeding chamber (4) is provided with an outlet (13); a solid waste conveying mechanism is provided at the top of the solid waste feeding chamber (4); the solid waste conveying mechanism comprises a screw conveyor 1 (5) and a screw conveyor 2 (6), the feed end of the screw conveyor 1 (5) is provided with a solid waste feed port (12), the discharge end of the screw conveyor 1 (5) is connected to the feed end of the screw conveyor 2 (6), and the screw conveyor 2 (6) is provided with a solid waste feed port (12). The discharge end of the conveyor 2 (6) is connected to the feed end of the solid waste feeding chamber (4); the inner diameter of the solid waste feeding chamber (4) is 800-1200mm; the raw material feeding chamber (3) and the solid waste feeding chamber (4) are arranged in sequence along the flow direction of the gas in the tertiary air branch pipe (1); the tertiary air branch pipe (1) is arranged obliquely downward along the flow direction of the gas therein, and the solid waste enters the solid waste feeding chamber (4) at room temperature, and the raw material enters the raw material feeding chamber (3) at room temperature; the temperature of the air in the tertiary air branch pipe (1) entering the solid waste feeding chamber (4) is controlled to be greater than 850°C, the negative pressure is less than -300Pa, and the wind speed is 20-30m / s.

2. The mixing and feeding chamber of the solid waste disposal cyclone furnace according to claim 1, characterized in that: The screw conveyor 1 (5) is a horizontal screw conveyor.

3. The mixing and feeding chamber of the solid waste disposal cyclone furnace according to claim 1, characterized in that: The second screw conveyor (6) is a vertical screw conveyor.

4. The mixing and feeding chamber of the solid waste disposal cyclone furnace according to claim 1, characterized in that: An electric gate valve (7) is provided on the tertiary air branch pipe (1), and the electric gate valve (7) is located on the air inlet side of the raw material feeding chamber (3).

5. A feeding process for a solid waste disposal cyclone furnace, characterized by: The feeding process of the solid waste disposal cyclone furnace is used for the mixed feeding chamber of the solid waste disposal cyclone furnace according to any one of claims 1 to 4, wherein the solid waste enters from the solid waste feeding chamber (4) at room temperature, and the raw material enters from the raw material feeding chamber (3) at room temperature; the temperature of the air in the tertiary air branch pipe (1) entering the solid waste feeding chamber (4) is controlled to be greater than 850°C, the negative pressure is less than -300Pa, and the wind speed is 20-30m / s.

6. The feeding process for the solid waste disposal cyclone furnace according to claim 5, characterized in that: The raw material comprises the following components by weight: 12.69-12.72 parts of silicon dioxide, 3.08-3.05 parts of aluminum oxide, 2.58 parts of iron oxide, 42.99-43.04 parts of calcium oxide, 0.93-0.99 parts of magnesium oxide, and has a KH value of 1.041-1.042, an SM value of 2.24-2.26, and an IM value of 1.18-1.19.

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