Method for improving heat treatment efficiency and pyrolysis carbonization furnace assembly using the method

Abstract

The present invention belongs to the technical field of pyrolysis carbonization, and particularly relates to a method for improving heat treatment efficiency and a pyrolysis carbonization furnace group using the method. The method for improving heat treatment efficiency, according to the heat treatment process of the material, the material is sequentially subjected to a gradient heating mode and an isothermal heating mode, the gradient heating mode is carried out in at least one gradient heating furnace body, the isothermal heating mode is carried out in at least one isothermal heating furnace body, the gradient heating furnace body and the isothermal heating furnace body are stacked up and down, the heating chambers of the gradient heating furnace body and the isothermal heating furnace body are connected, the heating temperature of the gradient heating mode is increased sequentially, and the heat source of the isothermal heating mode is a plurality of burners arranged along the isothermal heating furnace body. After adopting this scheme, not only the processing efficiency of the pyrolysis carbonization process can be improved and heat loss can be reduced, but the stacking arrangement of the gradient heating furnace body and the isothermal heating furnace body can also save floor space.

Description

Technical Field

[0001] The invention belongs to the technical field of pyrolysis carbonization, and in particular relates to a method for improving heat treatment efficiency and a pyrolysis carbonization furnace group using the method. Background Art

[0002] In the field of waste treatment such as oil sludge, municipal sludge, and organically contaminated soil, pyrolysis carbonization process has become a mainstream treatment process. The prior art has made relatively in-depth research on the pyrolysis carbonization process, among which how to improve the utilization efficiency of heat and the treatment efficiency of the pyrolysis carbonization process have always been two research focuses. Chinese patent document CN 207227248U discloses a sludge drying and carbonization treatment device, which includes a drying furnace body and a carbonization furnace body arranged in upper and lower layers. The drying furnace body and the carbonization furnace body are both jacketed rotary furnace bodies. The jacketed rotary furnace body includes a rotary furnace cavity, a heating cavity and an insulation layer. The hot flue gas in the heating cavity is provided by a combustion chamber. The heating cavity of the drying furnace body is connected to the heating cavity of the carbonization furnace body. The hot flue gas provides gradient heating for the material in the rotary furnace cavity. After the hot flue gas in the heating cavity of the lower carbonization furnace body completes the heating of the carbonization furnace body, it flows into the heating cavity of the drying furnace body to continue heating the drying furnace body, thereby reducing energy loss. The materials directly fall into the carbonization furnace body after passing through the upper drying furnace body, which improves the processing efficiency of the whole process. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for improving heat treatment efficiency and a pyrolysis carbonization furnace group using the method, so as to further improve the heat treatment efficiency of the pyrolysis carbonization process.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] The method for improving the heat treatment efficiency is that according to the heat treatment process of the material, the material passes through the gradient heating mode and the isothermal heating mode in sequence, and the heating temperature of the gradient heating mode increases in sequence.

[0006] As an improvement, the gradient heating mode is carried out in at least one gradient heating furnace body, and the isothermal heating mode is carried out in at least one isothermal heating furnace body, and the heating chambers of the gradient heating furnace body and the isothermal heating furnace body are connected.

[0007] As an improvement, the gradient heating furnace body and the isothermal heating furnace body both adopt a jacketed heating mode.

[0008] As a further improvement, the heat source of the isothermal heating mode is a plurality of burners arranged along the isothermal heating furnace body.

[0009] As a further improvement, the gradient heating furnace body and the isothermal heating furnace body are stacked up and down.

[0010] As an improvement, the gradient heating mode is carried out in at least one gradient heating furnace body, and the end of the last gradient heating furnace body adopts an isothermal heating mode.

[0011] The present invention also provides a pyrolysis carbonization furnace group, which comprises a gradient heating section and an isothermal heating section, wherein the heating chambers of the gradient heating section and the isothermal heating section are connected.

[0012] As an improvement, the gradient heating section includes at least one gradient heating furnace body, and the isothermal heating section includes at least one gradient heating furnace body.

[0013] As a further improvement, the gradient heating section includes at least one gradient heating furnace body, and the isothermal heating section is located at the end of the last gradient heating furnace body.

[0014] As a further improvement, the isothermal heating section realizes isothermal heating by arranging a plurality of burners along the furnace body of the isothermal heating section.

[0015] The inventive concept of the present invention is to divide the pyrolysis carbonization process into two steps: gradient heating and isothermal heating. The material adopts an isothermal heating mode at the back end of the pyrolysis carbonization process, which increases the residence time of the material at high temperature, thereby achieving the purpose of improving the processing efficiency. It should be noted that the isothermal heating mode described in this application does not mean that the temperature in the isothermal heating section is strictly equal, but means that there are multiple burners for heating along the length direction of the isothermal heating section, so that the temperature in the isothermal heating section remains relatively consistent.

[0016] More importantly, compared with the traditional combustion chamber providing hot flue gas as a heat source, the isothermal heating mode of the present application has less heat loss. The reason is that if the temperature of the hot flue gas at the entrance of the heating chamber is required to reach 950°C, the traditional mode is to configure a separate combustion chamber. Generally, it is necessary to first increase the temperature in the combustion chamber to about 1100°C, and then use cold air to adjust the temperature of the hot flue gas to about 950°C. However, if a number of burners are used to heat along the isothermal heating furnace body, if the temperature of the isothermal heating section is to be maintained at about 950°C, it is only necessary to burn the burner to about 950°C. Compared with the traditional method, the heat loss will be greatly reduced.

[0017] In summary, the adoption of this solution can not only improve the processing efficiency of the pyrolysis carbonization process and reduce heat loss, but the upper and lower stacking arrangement of the gradient heating furnace body and the isothermal heating furnace body can also save floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the present invention, the hatched lines in the figure represent the gradient heating furnace body and the isothermal heating furnace body, the dotted lines in the gradient heating furnace body and the isothermal heating furnace body represent the running route of the material, and the dotted lines in the heating chamber represent the running route of the hot flue gas;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention after removing the heating chamber.

[0020] In the figure: 1. Gradient heating furnace body; 2. Isothermal heating furnace body; 3. Heating chamber; 4. Burner; 5. Thermal compensator; 6. Feeding device; 7. Discharging port. DETAILED DESCRIPTION

[0021] Example 1

[0022] like Figure 1 , Figure 2 As shown, the method for improving the heat treatment efficiency of the present invention, according to the heat treatment process of the material, the material enters from the feeding device 6 and is discharged from the discharge port 7, and passes through the gradient heating mode and the isothermal heating mode in sequence, and the heating temperature of the gradient heating mode increases in sequence. The gradient heating mode is carried out in two gradient heating furnace bodies 1, and the isothermal heating mode is carried out in one isothermal heating furnace body 2. The two gradient heating furnace bodies 1 and one isothermal heating furnace body 2 are stacked up and down. A thermal compensator 5 is arranged between the ends of the two gradient heating furnace bodies 1 and one isothermal heating furnace body 2 to prevent the connection end of the furnace body from being damaged due to thermal expansion and contraction of the furnace body. The two gradient heating furnace bodies 1 form the gradient heating section of the pyrolysis carbonization furnace group, and the one isothermal heating furnace body 2 is the isothermal heating section of the pyrolysis carbonization furnace group. The setting form of the heating chamber 3 is the existing technology, and the gradient heating furnace body 1 and the isothermal heating furnace body 2 both adopt the jacket heating mode, and the heating chambers 3 of the gradient heating section and the isothermal heating section are connected. The heat source of the isothermal heating mode is a plurality of burners 4 arranged along the isothermal heating furnace body 2. The burner 4 is also of prior art, such as a gas burner of Wuxi Saineng Thermal Energy Technology Co., Ltd., which is a combustion device commonly used in industrial kilns. In this embodiment, the length of the isothermal heating furnace body 2 is about 10 meters, and 6 burners 4 are arranged at intervals.

[0023] Example 2

[0024] Embodiment 2 is different from Embodiment 1 in that the gradient heating mode is performed in a gradient heating furnace body 1, the isothermal heating mode is performed in an isothermal heating furnace body 2, and the burners 4 are arranged at intervals on the isothermal heating furnace body 2. This mode is suitable for materials with low moisture content, and no drying treatment is required at this time.

[0025] Example 3

[0026] Embodiment 3 is different from Embodiment 1 in that the isothermal heating section is no longer a complete furnace body, and the isothermal heating section is only located at the end of the last gradient heating furnace body 1. Figure 1, that is, the right side of the bottom furnace body is still in gradient heating mode, while the left side is in isothermal heating mode, that is, the burner 4 is only arranged on the left side of the bottom furnace body.

Claims

1. A method for improving heat treatment efficiency, characterized in that: According to the heat treatment process of the material, the material passes through the gradient heating mode and the isothermal heating mode in turn, and the heating temperature of the gradient heating mode is increased in turn to reach the temperature of the isothermal heating mode; a number of burners are arranged in the isothermal heating section, and the temperature of the isothermal heating section is heated to the required temperature of the hot flue gas at the inlet of the heating chamber by using the hot flue gas generated by the burner; the gradient heating mode is carried out in at least one gradient heating furnace body, and the isothermal heating mode is carried out in at least one isothermal heating furnace body, the gradient heating furnace body and the isothermal heating furnace body have independent heating chambers and all the heating chambers are connected, and the hot flue gas of the heating furnace body flows from the isothermal heating section to the gradient heating section in turn, so that the material is subjected to gradient heating and isothermal heating in turn; the material is always at the temperature of the isothermal heating section in the isothermal heating section, so that the material prolongs its residence time at high temperature.

2. The method for improving heat treatment efficiency according to claim 1, characterized in that: The gradient heating furnace body and the isothermal heating furnace body both adopt a jacket heating mode.

3. The method for improving heat treatment efficiency according to claim 1, characterized in that: The gradient heating furnace body and the isothermal heating furnace body are stacked up and down.

4. Pyrolysis carbonization furnace group, characterized by: It includes a gradient heating section and an isothermal heating section. The heating cavities of the gradient heating section and the isothermal heating section are connected. The isothermal heating section adopts a plurality of burners arranged along the furnace body of the isothermal heating section to realize isothermal heating. The gradient heating section includes at least one gradient heating furnace body, and the isothermal heating section includes at least one gradient heating furnace body. The gradient heating furnace body and the isothermal heating furnace body have independent heating cavities and all the heating cavities are connected. The hot flue gas of the heating furnace body flows from the isothermal heating section to the gradient heating section in sequence, so that the material is subjected to gradient heating and isothermal heating in sequence.

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