Cement kiln household garbage three-way kiln disposal device

Abstract

The utility model discloses a kind of cement kiln household garbage three-way kiln disposal device, including kiln body and respectively being arranged at kiln body two ends kiln head combustion chamber and kiln tail smoke chamber, the top of kiln tail smoke chamber is sequentially connected with rising flue and decomposition furnace, the outside of kiln body is provided with combustible garbage warehouse, non-combustible garbage warehouse and waste gas waste liquid warehouse, combustible garbage warehouse is communicated with kiln head combustion chamber by conveying pipeline, non-combustible garbage warehouse is communicated with kiln body kiln tail by conveying pipeline, the gas phase space of waste gas waste liquid warehouse is communicated with decomposition furnace by conveying pipeline, the liquid phase space of waste gas waste liquid warehouse is connected with filter by conveying pipeline, the liquid outlet of filter is communicated with rising flue by pipeline, the filter residue outlet of filter is communicated with kiln tail smoke chamber by pipeline. Above all, the utility model has the advantages of not producing waste residue, good disposal effect, and can be applied on a large scale.

Description

Technical Field

[0001] This utility model relates to the technical field of cement kiln domestic waste disposal equipment, specifically to a three-way inlet disposal device for cement kiln domestic waste. Background Technology

[0002] Urban solid waste is mostly treated using landfill, composting, and thermal treatment methods, but these methods all have problems such as secondary pollution, incomplete treatment, and excessive energy consumption. However, using cement kilns to co-process urban solid waste has the advantages of the "3T principle" of high temperature, long residence time, and thorough incineration. On the one hand, the cement firing system can eliminate odors and toxic substances generated during the waste treatment process; on the other hand, the ash produced by waste incineration can be used as cement admixture, and the toxic substances in the waste can be decomposed into corresponding inorganic substances and heavy metals that are solidified in the cement clinker; at the same time, some of the high-temperature exhaust gas generated by the cement kiln system can serve as a supplementary heat source or the sole heat source for waste incineration, making the incineration process more complete and further reducing or even eliminating dioxin emissions.

[0003] Based on the characteristics of cement kiln firing systems, municipal solid waste can enter the cement production process at different feeding points, commonly including: the main burner at the kiln head, the smoke chamber at the kiln tail, the rising flue, the precalciner, and the tertiary air duct inlet of the decomposition furnace. Current technology for feeding municipal solid waste into the kiln typically involves direct feeding in a single form. However, due to the significant variations in the properties of municipal solid waste, as the processing volume increases, this single direct feeding method has a substantial impact on the kiln's combustion conditions and feeding system, hindering its large-scale application. Therefore, developing a three-way municipal solid waste feeding device for cement kilns that produces no waste residue, has good treatment efficiency, and can be applied on a large scale is objectively necessary. Utility Model Content

[0004] The purpose of this utility model is to provide a cement kiln domestic waste three-way kiln treatment device that does not produce waste residue, has good treatment effect, and can be applied on a large scale.

[0005] The purpose of this utility model is achieved as follows: it includes a kiln body and a kiln head combustion chamber and a kiln tail smoke chamber respectively arranged at both ends of the kiln body. The top of the kiln tail smoke chamber is connected in sequence to an ascending flue and a decomposition furnace. The outside of the kiln body is provided with a combustible waste storage bin, a non-combustible waste storage bin, and a waste gas and waste liquid storage bin. The combustible waste storage bin is connected to the kiln head combustion chamber through a conveying pipeline. The non-combustible waste storage bin is connected to the kiln tail of the kiln body through a conveying pipeline. The gas phase space of the waste gas and waste liquid storage bin is connected to the decomposition furnace through a conveying pipeline. The liquid phase space of the waste gas and waste liquid storage bin is connected to a filter through a conveying pipeline. The liquid outlet of the filter is connected to the ascending flue through a pipeline. The filter residue outlet is connected to the kiln tail smoke chamber through a pipeline.

[0006] Furthermore, a slag storage bin is installed on the conveying pipeline between the filter slag outlet and the kiln tail smoke chamber, and a slag discharge branch pipe is installed on the conveying pipeline between the slag storage bin and the kiln tail smoke chamber, which is connected to the kiln head combustion chamber.

[0007] Furthermore, the combustible waste storage bin is divided into a high-calorific-value waste storage bin and a low-calorific-value waste storage bin by a partition. The high-calorific-value waste storage bin is connected to the kiln head combustion chamber. A mixing tank is installed on the pipeline between the non-combustible waste storage bin and the kiln body and kiln tail. The low-calorific-value waste storage bin is connected to a gasifier. The slag discharge port of the gasifier is connected to the mixing tank.

[0008] Furthermore, preheaters are installed on the conveying pipelines between the waste gas and waste liquid storage silo and the decomposition furnace, between the liquid outlet of the filter and the rising flue, and between the filter residue outlet and the kiln tail smoke chamber. The exhaust port of the gasifier is connected to the heat source inlet of each preheater through pipelines, and the heat source outlet of each preheater is connected to the decomposition furnace.

[0009] Furthermore, a crusher is connected to the ash discharge port of the gasifier, and the outlet of the crusher is connected to the mixing tank.

[0010] Furthermore, the high-calorific-value waste storage bin is connected to the decomposition furnace via a diversion pipeline.

[0011] In operation, this invention separates municipal solid waste into three categories: combustible waste, non-combustible waste, and waste gas and waste liquid. Combustible waste mainly consists of lightweight combustible materials such as plastics, paper, textiles, and wood, which are sent to the kiln head combustion chamber as alternative fuel, replacing some pulverized coal and saving fuel, thus reducing cement production costs. Non-combustible waste mainly consists of inorganic materials such as bricks, tiles, slag, and glass, whose components, such as silicon, calcium, aluminum, and iron, are the minerals required for cement clinker. It replaces some natural raw materials and is sent to the kiln tail as alternative raw materials, thus saving raw material consumption in cement production while disposing of waste. Waste gas and waste liquid are the leachate and emitted waste gas generated during the municipal solid waste treatment process. The waste gas is directly sent to the decomposition furnace, while the waste liquid is filtered through a filter. The resulting waste liquid is sent to the rising flue, and the filter residue is sent to the kiln tail flue. In other words, the waste gas and waste liquid are separated into three phases: gas, liquid, and solid, which are then introduced into different locations for separate treatment. This invention employs a three-way kiln-entry technology, introducing different types of municipal solid waste into different locations within the cement kiln system in different ways. It fully considers the characteristics of various types of municipal solid waste and the operating conditions of different parts of the cement kiln, increasing the processing capacity of municipal solid waste. This results in no waste residue after treatment, simple operation, and minimizes the impact of municipal solid waste treatment on the cement kiln's operating conditions while maximizing processing capacity. It has a large municipal solid waste disposal capacity and can simultaneously treat the combustible and non-combustible components, exhaust gas, and leachate from the municipal solid waste, achieving thorough disposal without waste residue. Furthermore, it effectively decomposes toxic and harmful components, reducing the concentration of dioxins, nitrogen oxides, sulfur dioxide, etc., to meet emission standards, and reducing flue gas volume, thus saving on tail gas treatment investment. In summary, this invention has the advantages of producing no waste residue, excellent treatment effect, and scalability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; In the diagram: 1-Kiln body, 2-Kiln head combustion chamber, 3-Kiln tail flue, 4-Rising flue, 5-Decomposition furnace, 6-Combustible waste storage bin, 7-Non-combustible waste storage bin, 8-Waste gas and waste liquid storage bin, 9-Filter, 10-Slag storage bin, 11-Slag discharge branch pipe, 12-High calorific value waste storage bin, 13-Low calorific value waste storage bin, 14-Agitator, 15-Gasifier, 16-Preheater, 17-Crusher. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0014] like Figure 1As shown, this utility model includes a kiln body 1 and a kiln head combustion chamber 2 and a kiln tail smoke chamber 3 respectively disposed at both ends of the kiln body 1. The top of the kiln tail smoke chamber 3 is connected in sequence to an ascending flue 4 and a decomposition furnace 5. The above-mentioned cement kiln components are existing technologies. Combustible waste storage bins 6, non-combustible waste storage bins 7 and waste gas and waste liquid storage bins 8 are disposed on the outside of the kiln body 1. Combustible waste storage bins 6 are connected to the kiln head combustion chamber 2 through a conveying pipeline. Non-combustible waste storage bins 7 are connected to the kiln tail of the kiln body 1 through a conveying pipeline. The gas phase space of the waste gas and waste liquid storage bins 8 is connected to the decomposition furnace 5 through a conveying pipeline. The liquid phase space of the waste gas and waste liquid storage bins 8 is connected to a filter 9 through a conveying pipeline. The filter 9 is existing technology and is used to filter the leachate, perform solid-liquid separation, and separate the residue in the leachate. The liquid outlet of the filter 9 is connected to the ascending flue 4 through a pipeline, and the filter residue outlet of the filter 9 is connected to the kiln tail smoke chamber 3 through a pipeline.

[0015] In operation, this utility model separates domestic waste into three categories: combustible waste, non-combustible waste, and waste gas and waste liquid. Combustible waste mainly consists of lightweight combustible materials such as plastics, paper, textiles, and wood, which are sent to the kiln head combustion chamber 2 as alternative fuel, replacing some of the coal powder, thus saving fuel and reducing cement production costs. Non-combustible waste mainly consists of inorganic materials such as bricks, tiles, slag, and glass, whose components such as silicon, calcium, aluminum, and iron are the mineral components required for cement clinker, replacing some of the natural raw materials. It is sent to the kiln tail of the kiln body 1 as alternative raw materials, which can save raw material consumption in cement production while disposing of waste. Waste gas and waste liquid are the leachate and emitted waste gas generated during the domestic waste treatment process. The waste gas is directly sent to the decomposition furnace 5, while the waste liquid is filtered through the filter 9. The resulting waste liquid is sent to the rising flue 4, and the filter residue is sent to the kiln tail flue 3. In other words, the waste gas and waste liquid are separated into three phases: gas, liquid, and solid, which are then introduced into different locations for corresponding treatment.

[0016] This invention employs a three-way kiln-entry technology, allowing different types of municipal solid waste to enter different locations within the cement kiln system in different ways. It fully considers the characteristics of various types of municipal solid waste and the operating conditions of different parts of the cement kiln, increasing the processing capacity of municipal solid waste. This results in no waste residue after processing, simple operation, and minimizes the impact of municipal solid waste processing on the cement kiln's operating conditions while maximizing the processing capacity. It has a large municipal solid waste disposal capacity and can simultaneously treat the combustible and non-combustible components, exhaust gas, and leachate from the municipal solid waste, providing thorough disposal without waste residue. Furthermore, it effectively decomposes toxic and harmful components, reducing the concentration of dioxins, nitrogen oxides, sulfur dioxide, etc., to meet emission standards, and reducing flue gas volume, thus saving on tail gas treatment investment.

[0017] A slag storage bin 10 is installed on the conveying pipeline between the slag outlet of filter 9 and the kiln tail flue 3. A slag discharge branch pipe 11 is installed on the conveying pipeline between the slag storage bin 10 and the kiln tail flue 3. The slag discharge branch pipe 11 is connected to the kiln head combustion chamber 2. The slag storage bin 10 is used to store the slag discharged from filter 9 and then divide it into two parts. Most of it is sent to the kiln tail flue 3, where the high temperature in the kiln tail flue 3 is used to completely decompose the organic matter in the slag. Even if a small portion cannot be decomposed and is discharged with the flue gas, it can be discharged into the subsequent rising flue 4 and decomposition furnace. The waste is fully decomposed within 5, and the decomposed inorganic components become part of the cement minerals, achieving the ultimate treatment and harmlessness of the waste. A small portion is sent to the kiln head combustion chamber 2, which is the highest temperature area in the cement production system. The extremely high temperature can ensure that any complex organic matter is decomposed instantly and completely. This invention sends a small amount of filter residue into this area, and efficiently decomposes the filter residue without affecting or with minimal impact on the operating conditions of the kiln head combustion chamber 2, thereby reducing the decomposition load on the filter residue in the kiln tail smoke chamber 3.

[0018] Combustible waste storage 6 is divided into high-calorific-value waste storage 12 and low-calorific-value waste storage 13 by a partition. High-calorific-value waste storage 12 is connected to the kiln head combustion chamber 2. A mixing tank 14 is installed on the pipeline between the non-combustible waste storage 7 and the kiln tail of the kiln body 1. Low-calorific-value waste storage 13 is connected to a gasifier 15, and the slag discharge port of the gasifier 15 is connected to the mixing tank 14. High-calorific-value municipal solid waste refers to a portion of municipal solid waste with high content of combustibles such as plastics, paper, textiles, and wood and bamboo, and low content of kitchen waste and moisture. Low-calorific-value municipal solid waste refers to a portion of municipal solid waste with high content of kitchen waste and moisture, and low content of combustibles. This invention separates low-calorific-value municipal solid waste from combustible waste and gasifies it using a gasifier 15. On the one hand, this prevents the low-calorific-value municipal solid waste from affecting the working conditions of the kiln head combustion chamber 2. On the other hand, the gasification process produces slag, the components of which are raw materials for cement production. This slag is then fed into a mixing tank 14 to mix and homogenize with non-combustible waste before being sent to a cement kiln for firing. This process produces no waste residue and reduces the amount and cost of cement raw materials.

[0019] Preheaters 16 are installed on the conveying pipelines between the waste gas and waste liquid storage silo 8 and the decomposition furnace 5, the conveying pipelines between the liquid outlet of the filter 9 and the rising flue 4, and the conveying pipelines between the filter residue outlet of the filter 9 and the kiln tail smoke chamber 3. The exhaust port of the gasifier 15 is connected to the heat source inlet of each preheater 16 through pipelines, and the heat source outlet of each preheater 16 is connected to the decomposition furnace 5. The preheaters 16 are existing technology and are used to preheat the waste gas, waste liquid, and filter residue. They can be gas-to-gas heat exchangers, gas-liquid heat exchangers, or gas-solid heat exchangers, and the specific structure is selected according to the actual situation. The heat source is the gas generated in the gasifier 15, which increases the temperature of the waste gas, waste liquid, and filter residue, thereby improving their decomposition efficiency when entering the decomposition furnace 5, the rising flue 4, and the kiln tail smoke chamber 3.

[0020] The slag discharge port of the gasifier 15 is connected to a crusher 17, and the outlet of the crusher 17 is connected to the mixing tank 14. The crusher 17 is an existing crushing equipment. In the gasifier 15, low-calorific-value municipal solid waste undergoes partial combustion and gasification reactions under anaerobic or hypoxic conditions, and organic matter is converted into combustible gas. The remaining solid waste is the slag. The slag is mainly composed of non-combustible materials such as glass, ceramics, and sand from the municipal solid waste, and is itself a raw material component for cement production. Therefore, the slag in the gasifier 15 is crushed by the crusher 17 and then sent to the kiln 1 to be burned together with the raw materials, thereby improving the resource utilization rate of the slag.

[0021] The high-calorific-value waste storage bin 12 is connected to the decomposition furnace 5 via a diversion pipeline. The high-calorific-value waste is sent to the kiln head combustion chamber 2 as fuel to replace part of the pulverized coal. However, since the calorific value of pulverized coal is much higher than that of high-calorific-value municipal solid waste, and the calorific value of pulverized coal is very stable, while the calorific value of municipal solid waste fluctuates greatly, in actual implementation, if too much high-calorific-value municipal solid waste is put into the kiln head combustion chamber 2, it will affect the combustion efficiency of the kiln head combustion chamber 2, and thus affect the kiln head operating conditions, causing fluctuations and instability in the operating conditions. In order to reduce the above fluctuations in operating conditions, part of the high-calorific-value municipal solid waste is sent to the decomposition furnace 5 to replace part of the fuel for combustion in the decomposition furnace 5, thereby improving the stability of the operating conditions of the cement kiln head.

Claims

1. A three-way inlet treatment device for municipal solid waste in a cement kiln, comprising a kiln body (1) and a kiln head combustion chamber (2) and a kiln tail flue chamber (3) respectively disposed at both ends of the kiln body (1), wherein the top of the kiln tail flue chamber (3) is sequentially connected to an ascending flue (4) and a decomposition furnace (5), characterized in that: The outer side of the kiln body (1) is provided with a combustible waste storage bin (6), a non-combustible waste storage bin (7) and a waste gas and waste liquid storage bin (8). The combustible waste storage bin (6) is connected to the kiln head combustion chamber (2) through a conveying pipeline. The non-combustible waste storage bin (7) is connected to the kiln tail of the kiln body (1) through a conveying pipeline. The gas phase space of the waste gas and waste liquid storage bin (8) is connected to the decomposition furnace (5) through a conveying pipeline. The liquid phase space of the waste gas and waste liquid storage bin (8) is connected to a filter (9) through a conveying pipeline. The liquid outlet of the filter (9) is connected to the rising flue (4) through a pipeline. The filter residue outlet of the filter (9) is connected to the kiln tail smoke chamber (3) through a pipeline.

2. The cement kiln domestic waste three-way inlet treatment device according to claim 1, characterized in that: A slag storage bin (10) is provided on the conveying pipeline between the filter residue outlet of the filter (9) and the kiln tail smoke chamber (3). A slag discharge branch pipe (11) is provided on the conveying pipeline between the slag storage bin (10) and the kiln tail smoke chamber (3). The slag discharge branch pipe (11) is connected to the kiln head combustion chamber (2).

3. The cement kiln domestic waste three-way inlet treatment device according to claim 1, characterized in that: The combustible waste storage bin (6) is divided into a high-calorific-value waste storage bin (12) and a low-calorific-value waste storage bin (13) by a partition. The high-calorific-value waste storage bin (12) is connected to the kiln head combustion chamber (2). A mixing tank (14) is installed on the pipeline between the non-combustible waste storage bin (7) and the kiln tail of the kiln body (1). The low-calorific-value waste storage bin (13) is connected to a gasifier (15). The slag discharge port of the gasifier (15) is connected to the mixing tank (14).

4. The cement kiln domestic waste three-way inlet disposal device according to claim 3, characterized in that: Preheaters (16) are respectively installed on the conveying pipeline between the waste gas and waste liquid storage tank (8) and the decomposition furnace (5), the conveying pipeline between the liquid outlet of the filter (9) and the rising flue (4), and the conveying pipeline between the filter residue outlet of the filter (9) and the kiln tail smoke chamber (3). The exhaust port of the gasifier (15) is connected to the heat source inlet of each preheater (16) through pipelines, and the heat source outlet of each preheater (16) is connected to the decomposition furnace (5).

5. A cement kiln domestic waste three-way inlet treatment device according to claim 3, characterized in that: The gasifier (15) has a slag discharge port connected to a crusher (17), and the outlet of the crusher (17) is connected to the mixing tank (14).

6. A cement kiln domestic waste three-way inlet disposal device according to claim 3, characterized in that: The high-calorific-value waste storage bin (12) is connected to the decomposition furnace (5) via a diversion pipeline.

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