A multi-source solid waste disposal system and method based on a cement kiln

Abstract

The application discloses a multi-source solid waste disposal system and method based on a cement kiln, wherein the outlet of a multi-source solid waste feeding system is connected with the inlet of a multi-source solid waste integrated treatment machine, the outlet of the multi-source solid waste integrated treatment machine is connected with the inlet of a cyclone separator, the solid outlet of the cyclone separator is connected with the kiln tail of a cement rotary kiln through a main carbonization product conveying pipeline, the outlet of a raw material supply system is connected with the inlet of a cyclone preheater, the solid outlet of the cyclone preheater is connected with the inlet of a decomposing furnace, the outlet of the decomposing furnace is connected with the kiln head of the cement rotary kiln, the gas outlet of the cyclone preheater is connected with the inlet of the multi-source solid waste integrated treatment machine, the gas outlet of the cyclone separator is connected with the inlet of an acid removal device, and the outlet of the acid removal device is connected with the main carbonization product conveying pipeline. The system and method realize the collaborative disposal of multi-source solid waste based on the cement kiln.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of multi-source solid waste disposal, and relates to a multi-source solid waste disposal system and method based on a cement kiln. BACKGROUND

[0002] In recent years, in addition to the mature sludge disposal technology in cooperation with the cement kiln, the technology for cooperatively disposing of garbage and other solid wastes is still in the development stage and has less practical application. In the process of breaking the multi-source solid waste siege problem and realizing the utilization of multi-source solid waste in the form of "reduction, harmlessness and resource", it is found that, due to the large difference in the physicochemical properties of multi-source solid waste, the current cement kiln cooperative disposal technology cannot realize the integrated disposal of multi-source solid waste by one set of system; part of the multi-source solid waste has a high content of halogen elements such as Cl and F, and direct disposal into the kiln will have a great impact on the quality of clinker; and the supply of single solid waste in the region is limited, which cannot maximize the cooperative disposal capacity of the cement kiln, thereby restricting the promotion speed of the cement kiln in the solid waste disposal industry. SUMMARY

[0003] The application aims to overcome the shortcomings of the prior art and provides a multi-source solid waste disposal system and method based on a cement kiln, which realizes the cooperative disposal of multi-source solid waste based on the cement kiln.

[0004] To achieve the above-mentioned purpose, the application discloses a multi-source solid waste disposal system based on a cement kiln, which comprises a multi-source solid waste feeding system, a multi-source solid waste integrated treatment machine, a cyclone separator, a main carbonization product conveying pipeline, a cement rotary kiln, a raw material supply system, a cyclone preheater, a decomposition furnace and an acid removal device.

[0005] The outlet of the multi-source solid waste feeding system is connected to the inlet of the multi-source solid waste integrated treatment machine, the outlet of the multi-source solid waste integrated treatment machine is connected to the inlet of the cyclone separator, and the solid outlet of the cyclone separator is connected to the kiln tail of the cement rotary kiln through the main carbonization product conveying pipeline.

[0006] The outlet of the raw material supply system is connected to the inlet of the cyclone preheater, the solid outlet of the cyclone preheater is connected to the inlet of the decomposition furnace, and the outlet of the decomposition furnace is connected to the kiln head of the cement rotary kiln; the smoke outlet of the cyclone preheater is connected to the inlet of the multi-source solid waste integrated treatment machine; the gas outlet of the cyclone separator is connected to the inlet of the acid removal device, and the outlet of the acid removal device is connected to the main carbonization product conveying pipeline.

[0007] The outlet of the multi-source solid waste feeding system is connected to the inlet of the multi-source solid waste integrated treatment machine through a spiral conveyor.

[0008] Further comprising a booster fan and a kiln tail burner; the solid outlet of the cyclone separator is connected with the booster fan through a main carbonization product conveying pipeline, and the outlet of the booster fan is connected with the kiln tail of the cement rotary kiln through the kiln tail burner.

[0009] The flue gas outlet of the cyclone preheater is connected with the inlet of the multi-source solid waste integrated treatment machine through a high-temperature furnace flue pipeline.

[0010] Further comprising a flue gas treatment device, and the waste gas outlet of the cyclone preheater is connected with the flue gas treatment device.

[0011] The outlet of the acid removal device is connected with the main carbonization product conveying pipeline through a main deacidification gas pipeline.

[0012] Further comprising a Roots blower and a decomposing furnace burner, and the solid outlet of the cyclone separator is connected with the inlet of the Roots blower through a bypass carbonization product conveying pipeline, and the outlet of the Roots blower is connected with the decomposing furnace through the decomposing furnace burner.

[0013] The outlet of the acid removal device is connected with the bypass carbonization product conveying pipeline through a bypass deacidification gas pipeline.

[0014] The application discloses a multi-source solid waste disposal method based on a cement kiln, which comprises the following steps:

[0015] The multi-source solid waste is sent into the multi-source solid waste integrated treatment machine through a multi-source solid waste feeding system, high-temperature flue gas is extracted from the cyclone preheater, and then introduced into the multi-source solid waste integrated treatment machine; in the multi-source solid waste integrated treatment machine, the high-temperature flue gas is used to dry, carbonize and crush the multi-source solid waste in a direct contact mode, and the product discharged from the multi-source solid waste integrated treatment machine is sent into a cyclone separator for separation; the separated gas enters an acid removal device for acid removal to obtain deacidification gas, and then enters the main carbonization product conveying pipeline; the carbonization product after separation enters the main carbonization product conveying pipeline, mixes with the deacidification gas in the main carbonization product conveying pipeline, and is sprayed into a cement rotary kiln.

[0016] The cement raw material is sent into the cyclone preheater through a raw material supply system, falls into a decomposing furnace for incineration and decomposition after multi-stage preheating, and then enters the cement rotary kiln through the kiln head for clinker preparation.

[0017] The temperature of the high-temperature flue gas extracted from the cyclone preheater is 550-650 DEG C.

[0018] The application has the following beneficial effects:

[0019] The cement kiln-based multi-source solid waste disposal system and method can realize harmless resourceful disposal of multiple solid wastes through one process, effectively realize solid waste reduction and heavy metal solidification, fully utilize the calorific value of multi-source solid waste to realize fuel substitution of the cement kiln, reduce the use of fossil fuels, reduce the fuel use cost of the cement plant, change the social function positioning of the cement kiln, avoid early shutdown of the kiln still in service period due to the overcapacity of the national cement production, effectively save social resources, and help the construction of beautiful China. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The figure is a structural schematic diagram of the present application.

[0021] 1 is a multi-source solid waste feeding system, 2 is a screw conveyor, 3 is a raw material supply system, 4 is a cyclone preheater, 5 is a multi-source solid waste integrated treatment machine, 6 is a cyclone separator, 7 is an acid removal device, 8 is a booster fan, 9 is a Roots blower, 10 is a cement rotary kiln, 101 is a kiln tail burner, 11 is a decomposition furnace, 111 is a decomposition furnace burner, 12 is a high-temperature furnace flue, 13 is a flue gas treatment device, 141 is a main acid-removing gas pipeline, 142 is a bypass acid-removing gas pipeline, 151 is a main carbonization product conveying pipeline, and 152 is a bypass carbonization product conveying pipeline. DETAILED DESCRIPTION

[0022] In order to enable personnel in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments, and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts should fall within the scope of the present application.

[0023] The structural schematic diagram according to the disclosed embodiment of the present application is shown in the accompanying drawings. These drawings are not drawn to scale, in which some details are exaggerated for the purpose of clarity and some details can be omitted. The shapes of various regions, layers and the relative size and position relationship therebetween shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and a person skilled in the art can additionally design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0024] Reference Figure 1 The cement kiln-based multi-source solid waste disposal system according to the present application comprises a multi-source solid waste feeding system 1, a screw conveyor 2, a raw material supply system 3, a cyclone preheater 4, a multi-source solid waste integrated treatment machine 5, a cyclone separator 6, an acid removal device 7, a booster fan 8, a Roots blower 9, a cement rotary kiln 10, a kiln tail burner 101, a decomposition furnace 11, a decomposition furnace burner 111, a high-temperature furnace flue 12, a flue gas treatment device 13, a main deacidification gas pipeline 141, a bypass deacidification gas pipeline 142, a main carbonization product conveying pipeline 151 and a bypass carbonization product conveying pipeline 152.

[0025] The outlet of the multi-source solid waste feeding system 1 is connected to the inlet of the multi-source solid waste integrated treatment machine 5 through the screw conveyor 2, the outlet of the multi-source solid waste integrated treatment machine 5 is connected to the inlet of the cyclone separator 6, the solid outlet of the cyclone separator 6 is connected to the booster fan 8 through the main carbonization product conveying pipeline 151, and the outlet of the booster fan 8 is connected to the kiln tail of the cement rotary kiln 10 through the kiln tail burner 101.

[0026] The outlet of the raw material supply system 3 is connected to the inlet of the cyclone preheater 4, the solid outlet of the cyclone preheater 4 is connected to the inlet of the decomposition furnace 11, and the outlet of the decomposition furnace 11 is connected to the kiln head of the cement rotary kiln 10.

[0027] The smoke outlet of the cyclone preheater 4 is connected to the inlet of the multi-source solid waste integrated treatment machine 5 through the high-temperature furnace flue 12.

[0028] The exhaust gas outlet of the cyclone preheater 4 is connected to the flue gas treatment device 13.

[0029] The gas outlet of the cyclone separator 6 is connected to the inlet of the acid removal device 7, and the outlet of the acid removal device 7 is connected to the main carbonization product conveying pipeline 151 through the main deacidification gas pipeline 141.

[0030] In this embodiment, the solid outlet of the cyclone separator 6 is connected to the inlet of the Roots blower 9 through the bypass carbonization product conveying pipeline 152, and the outlet of the Roots blower 9 is connected to the decomposition furnace 11 through the decomposition furnace burner 111.

[0031] In this embodiment, the outlet of the acid removal device 7 is connected to the bypass carbonization product conveying pipeline 152 through the bypass deacidification gas pipeline 142.

[0032] With reference to Figure 1 The cement kiln-based multi-source solid waste disposal method comprises the following steps:

[0033] The multi-source solid waste is sent into the multi-source solid waste integrated treatment machine 5 through the multi-source solid waste feeding system 1 and the screw conveyor 2, high-temperature flue gas at 550-650℃ is extracted from the cyclone preheater 4, and then introduced into the multi-source solid waste integrated treatment machine 5 through the high-temperature furnace flue pipeline 12. In the multi-source solid waste integrated treatment machine 5, the high-temperature flue gas directly contacts the multi-source solid waste to dry, carbonize and crush the multi-source solid waste in an integrated manner. The product discharged from the multi-source solid waste integrated treatment machine 5 is sent to the cyclone separator 6 for separation.

[0034] The separated gas enters the acid removal device 7 for acid removal. The halogen element substances such as Cl and F are removed by reacting with the alkaline substances in the acid removal device 7 to obtain deacidification gas, which is then introduced into the main carbonization product conveying pipeline 151 through the main deacidification gas pipeline 141. The separated carbonization product enters the main carbonization product conveying pipeline 151 and is mixed with the deacidification gas in the main carbonization product conveying pipeline 151, and then is injected into the cement rotary kiln 10 through the booster fan 8 and the kiln tail burner 101.

[0035] The cement raw material is sent into the cyclone preheater 4 by the raw material supply system 3, falls into the decomposition furnace 11 after multi-stage preheating for incineration and decomposition, and then enters the cement rotary kiln 10 through the kiln head for clinker preparation.

[0036] The waste flue gas output by the cyclone preheater 4 is treated by the flue gas treatment device 13 and then discharged after reaching the standard.

[0037] In addition, when necessary, the carbonization product separated by the cyclone separator 6 is injected into the decomposition furnace 11 through the bypass carbonization product conveying pipeline 152 and the Roots blower 9, and then is incinerated by the decomposition furnace burner 111.

[0038] When necessary, the deacidification gas is introduced into the bypass carbonization product conveying pipeline 152 through the bypass deacidification gas pipeline 142, and then is injected into the decomposition furnace 11 through the Roots blower 9 and the decomposition furnace burner 111 for disposal.

[0039] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A multi-source solid waste treatment system based on cement kilns, characterized in that, It includes a multi-source solid waste feeding system (1), a multi-source solid waste integrated treatment machine (5), a cyclone separator (6), a main carbonization product conveying pipeline (151), a cement rotary kiln (10), a raw material supply system (3), a cyclone preheater (4), a decomposition furnace (11), and an acid removal device (7); The outlet of the multi-source solid waste feeding system (1) is connected to the inlet of the multi-source solid waste integrated treatment machine (5), the outlet of the multi-source solid waste integrated treatment machine (5) is connected to the inlet of the cyclone separator (6), and the solid outlet of the cyclone separator (6) is connected to the kiln tail of the cement rotary kiln (10) through the main carbonization product conveying pipeline (151). The outlet of the raw material supply system (3) is connected to the inlet of the cyclone preheater (4), the solid outlet of the cyclone preheater (4) is connected to the inlet of the decomposition furnace (11), and the outlet of the decomposition furnace (11) is connected to the kiln head of the cement rotary kiln (10); the flue gas outlet of the cyclone preheater (4) is connected to the inlet of the multi-source solid waste integrated treatment machine (5); the gas outlet of the cyclone separator (6) is connected to the inlet of the acid removal device (7), and the outlet of the acid removal device (7) is connected to the main carbonization product conveying pipeline (151).

2. The multi-source solid waste treatment system based on cement kilns according to claim 1, characterized in that, The outlet of the multi-source solid waste feeding system (1) is connected to the inlet of the multi-source solid waste integrated treatment machine (5) via a screw conveyor (2).

3. The multi-source solid waste treatment system based on cement kilns according to claim 1, characterized in that, It also includes a booster fan (8) and a kiln tail burner (101); the solid outlet of the cyclone separator (6) is connected to the booster fan (8) through the main carbonization product conveying pipeline (151), and the outlet of the booster fan (8) is connected to the kiln tail of the cement rotary kiln (10) through the kiln tail burner (101).

4. The multi-source solid waste treatment system based on cement kilns according to claim 1, characterized in that, The flue gas inlet of the cyclone preheater (4) is connected to the inlet of the multi-source solid waste integrated treatment machine (5) through the high-temperature flue gas pipe (12).

5. The multi-source solid waste treatment system based on cement kilns according to claim 1, characterized in that, It also includes a flue gas treatment device (13), and the exhaust outlet of the cyclone preheater (4) is connected to the flue gas treatment device (13).

6. The multi-source solid waste treatment system based on cement kilns according to claim 1, characterized in that, The outlet of the acid removal device (7) is connected to the main carbonization product conveying pipeline (151) through the main deacidification gas pipeline (141).

7. The multi-source solid waste treatment system based on cement kilns according to claim 1, characterized in that, It also includes a Roots blower (9) and a decomposition furnace burner (111). The solid outlet of the cyclone separator (6) is connected to the inlet of the Roots blower (9) through a bypass carbonization product conveying pipe (152). The outlet of the Roots blower (9) is connected to the decomposition furnace (11) through the decomposition furnace burner (111).

8. The multi-source solid waste treatment system based on cement kilns according to claim 7, characterized in that, The outlet of the acid removal device (7) is connected to the bypass carbonization product conveying pipeline (152) through the bypass deacidification gas pipeline (142).

9. A method for treating multi-source solid waste based on cement kilns, characterized in that, The multi-source solid waste treatment system based on cement kilns as described in claim 1 includes the following steps: Multi-source solid waste is fed into the multi-source solid waste integrated treatment machine (5) through the multi-source solid waste feeding system (1). High-temperature flue gas is extracted from the cyclone preheater (4) and then introduced into the multi-source solid waste integrated treatment machine (5). In the multi-source solid waste integrated treatment machine (5), the high-temperature flue gas directly contacts the multi-source solid waste for integrated treatment of drying, carbonization and crushing. The product discharged from the multi-source solid waste integrated treatment machine (5) is sent to the cyclone separator (6) for separation. The separated gas enters the acid removal device (7) for acid removal to obtain deacidified gas, and then enters the main carbonization product conveying pipeline (151). The separated carbonization product enters the main carbonization product conveying pipeline (151) and is mixed with the deacidified gas in the main carbonization product conveying pipeline (151) before being sprayed into the cement rotary kiln (10). Cement raw materials are fed into the cyclone preheater (4) by the raw material supply system (3), and after multi-stage preheating, they fall into the decomposition furnace (11) for incineration and decomposition, and then enter the cement rotary kiln (10) through the kiln head for clinker preparation.

10. The method for multi-source solid waste disposal based on cement kilns according to claim 9, characterized in that, The temperature of the high-temperature flue gas extracted from the cyclone preheater (4) is 550-650℃.

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