Energy-saving and environment-friendly kiln internal circulation smoke exhaust air duct

Abstract

The utility model discloses an energy-saving environment-friendly kiln internal circulation smoke exhaust air duct which comprises an air duct body, one end of the air duct body is communicated with an air outlet of a kiln, the other end of the air duct body is communicated with an air inlet of a desulfurization and denitrification machine, and the air duct body is formed by sequentially communicating a drying section, a preheating section and a heating section. A waste heat utilization mechanism is arranged between the desulfurization and denitrification machine and the preheating section, the waste heat utilization mechanism is composed of an air return pipe, an exhaust pipe and a preheating part, and the preheating part is arranged on the outer surface of the preheating section in a sleeving mode and fixedly connected with the preheating section. According to the waste gas preheating device, the heated waste gas subjected to desulfurization and denitrification treatment can enter the preheating bin in the preheating part through the gas return pipe, and after the treated waste gas makes contact with the outer wall of the preheating section, heat can be conducted to the waste gas which is not heated in the preheating section, so that preheating treatment of the waste gas is completed, the heat of the waste gas can be effectively recycled, and energy conservation and environment protection are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke exhaust ducts, and specifically relates to an energy-saving and environment-friendly in-furnace circulating smoke exhaust duct for a kiln furnace. Background Technique

[0002] When firing brick blanks in a kiln furnace, a large amount of flue gas will be generated, and the hot flue gas in the kiln needs to be extracted through a smoke exhaust duct to enable the fuel to burn smoothly. A large amount of sulfur and nitrate substances will be contained in the flue gas, and it needs to be treated before being discharged.

[0003] Since the flue gas needs to be at an appropriate temperature for desulfurization and denitrification reactions, the flue gas in the duct needs to be heated. This will cause the flue gas after desulfurization and denitrification to contain a large amount of heat. If the treated flue gas is directly discharged, a large amount of heat will be wasted. For this reason, an energy-saving and environment-friendly in-furnace circulating smoke exhaust duct for a kiln furnace is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide an energy-saving and environment-friendly in-furnace circulating smoke exhaust duct for a kiln furnace to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An energy-saving and environment-friendly in-furnace circulating smoke exhaust duct for a kiln furnace, including a duct body. One end of the duct body is communicated with the air outlet of the kiln furnace, and the other end of the duct body is communicated with the air inlet of the desulfurization and denitrification machine. The duct body is successively communicated and composed of a drying section, a preheating section, and a heating section. A waste heat utilization mechanism is arranged between the desulfurization and denitrification machine and the preheating section. The waste heat utilization mechanism is composed of a return pipe, an exhaust pipe, and a preheating member. The preheating member is sleeved on the outer surface of the preheating section and fixedly connected to the preheating section. A preheating chamber is arranged inside the preheating member. An air inlet end is arranged on one side of the preheating member, and the air inlet end is communicated with the desulfurization and denitrification machine through the return pipe. An exhaust end is arranged on the other side of the preheating member, and an exhaust pipe is communicated with the exhaust end.

[0006] As a further preference of this technical solution, the drying section, the preheating section, and the heating section are successively distributed along the direction from the kiln furnace to the desulfurization and denitrification machine.

[0007] As a further preference of this technical solution, the preheating section is composed of a connection end and a preheating air pipe. The two connection ends are respectively communicated with the drying section and the heating section, and a plurality of preheating air pipes are communicated between the two connection ends.

[0008] As a further preference of this technical solution, the preheating air pipe is in a plate-shaped structure, the preheating air pipe is made of ceramic material, and a plurality of preheating air pipes are equally spaced from top to bottom. A hot air layer is formed between adjacent two preheating air pipes.

[0009] As a further preference of the present technical solution, the intake end is located on one side of the side wall of the preheating member close to the drying section, and the exhaust end is located on one side of the side wall of the preheating member close to the heating section.

[0010] As a further preference of the present technical solution, the connection position between the preheating member and the preheating section is fixedly connected by welding.

[0011] As a further preference of the present technical solution, the return air pipe and the outer surface of the preheating member are coated with a heat insulation coating.

[0012] The utility model provides an energy-saving and environment-friendly in-kiln circulating smoke exhaust air duct, which has the following beneficial effects:

[0013] Through a unique structural design, the utility model can make the waste gas after desulfurization and denitration treatment enter the preheating bin in the preheating member through the return air pipe. After the treated waste gas contacts the outer wall of the preheating section, the heat can be conducted to the unheated waste gas in the preheating section, so as to complete the preheating treatment of the waste gas, effectively recover the heat of the waste gas, and save energy and protect the environment. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a split schematic diagram of the overall structure of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the preheating section in the utility model;

[0017] Figure 4 It is a schematic diagram of the structure of the waste heat utilization mechanism in the utility model;

[0018] In the figure: 1, air duct body; 2, drying section; 3, preheating section; 4, heating section; 5, return air pipe; 6, exhaust pipe; 7, preheating member; 8, intake end; 9, exhaust end; 10, connection end; 11, preheating air pipe; 12, hot gas layer; 13, preheating bin; 14, desulfurization and denitration machine. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model.

[0020] The utility model provides a technical solution: As Figures 1 to 4As shown in the figure, in this embodiment, an energy-saving and environmental-friendly kiln internal circulation smoke exhaust air duct includes an air duct body 1. One end of the air duct body 1 is connected to the air outlet of the kiln, and the other end of the air duct body 1 is connected to the air inlet of the desulfurization and denitration machine 14. The air duct body 1 is successively connected and composed of a drying section 2, a preheating section 3, and a heating section 4. The drying section 2, the preheating section 3, and the heating section 4 are successively distributed along the direction from the kiln to the desulfurization and denitration machine 14. A waste heat utilization mechanism is arranged between the desulfurization and denitration machine 14 and the preheating section 3. The waste heat utilization mechanism is composed of a return air pipe 5, an exhaust pipe 6, and a preheating member 7. The preheating member 7 is sleeved on the outer surface of the preheating section 3 and fixedly connected to the preheating section 3. A preheating chamber 13 is opened inside the preheating member 7. An air inlet end 8 is arranged on one side of the preheating member 7. The air inlet end 8 is connected to the desulfurization and denitration machine 14 through the return air pipe 5. An air outlet end 9 is arranged on the other side of the preheating member 7. The exhaust pipe 6 is connected to the air outlet end 9.

[0021] Among them, the preheating section 3 is composed of a connection end 10 and a preheating air pipe 11. The two connection ends 10 are respectively connected to the drying section 2 and the heating section 4. A plurality of preheating air pipes 11 are connected between the two connection ends 10. The preheating air pipes 11 are in a plate-like structure. The preheating air pipes 11 are made of ceramic material. The plurality of preheating air pipes 11 are equally spaced from top right to bottom. A hot gas layer 12 is formed between two adjacent preheating air pipes 11.

[0022] By arranging a plurality of preheating air pipes 11 in a plate-like structure, the contact area between the preheating air pipes 11 and the waste gas flowing back into the preheating chamber 13 can be increased, thereby improving the heat transfer efficiency and further improving the preheating efficiency.

[0023] Among them, the air inlet end 8 is located on the side of the side wall of the preheating member 7 close to the drying section 2, and the air outlet end 9 is located on the side of the side wall of the preheating member 7 close to the heating section 4.

[0024] With such an arrangement, the waste gas flowing back into the preheating member 7 can flow along the direction from the drying section 2 to the heating section 4.

[0025] Among them, the connection position between the preheating member 7 and the preheating section 3 is fixedly connected by welding.

[0026] Welding has good sealing performance, which can ensure that the waste gas in the preheating chamber 13 will not leak.

[0027] Among them, the outer surface of the return air pipe 5 and the preheating member 7 is coated with a heat insulation coating. The heat insulation coating is made of glass fiber material.

[0028] By arranging the heat insulation coating, the speed of heat dissipation of the waste gas heat in the return air pipe 5 and the preheating member 7 to the outside can be alleviated.

[0029] The present utility model provides an energy-saving and environmental-friendly kiln internal circulation smoke exhaust air duct. The specific working principle is as follows:

[0030] During use, the waste gas of the kiln enters the desulfurization and denitrification machine 14 after passing through the drying section 2, the preheating section 3, and the heating section 4 for desulfurization and denitrification treatment. The treated waste gas can enter the preheating chamber 13 in the preheating member 7 through the return pipe 5. After the treated waste gas contacts the outer wall of the preheating section 3, the heat can be conducted to the waste gas that has not been heated in the preheating section 3, thereby completing the preheating treatment of the waste gas, effectively recovering the heat of the waste gas, saving energy and protecting the environment. By providing multiple preheating gas pipes 11 in a plate-like structure, the contact area between the preheating gas pipes 11 and the waste gas flowing back into the preheating chamber 13 can be increased. The preheating gas pipes 11 are made of ceramic material, which can improve the heat conduction efficiency and thus the preheating efficiency. The heat insulation coating on the outer surface of the return pipe 5 and the preheating member 7 can slow down the speed at which the heat of the waste gas in the return pipe 5 and the preheating member 7 volatilizes to the outside.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving and environment-friendly kiln internal circulation smoke exhaust air duct, comprising an air duct body (1), characterized in that: One end of the air duct body (1) is connected to the air outlet of the kiln, and the other end of the air duct body (1) is connected to the air inlet of the desulfurization and denitrification machine (14). The air duct body (1) is composed of a drying section (2), a preheating section (3) and a heating section (4) which are connected in sequence. A waste heat utilization mechanism is arranged between the desulfurization and denitrification machine (14) and the preheating section (3). The waste heat utilization mechanism is composed of a return air pipe (5), an exhaust pipe (6) and a preheating element (7). The preheating element (7) is sleeved on the outer surface of the preheating section (3) and is fixedly connected to the preheating section (3). A preheating chamber (13) is provided inside the preheating element (7). An air inlet end (8) is arranged on one side of the preheating element (7). The air inlet end (8) is connected to the desulfurization and denitrification machine (14) through the return air pipe (5). An exhaust end (9) is arranged on the other side of the preheating element (7). The exhaust end (9) is connected to the exhaust pipe (6).

2. The energy-saving and environment-friendly kiln internal circulation smoke exhaust duct according to claim 1 is characterized by: The drying section (2), the preheating section (3) and the heating section (4) are sequentially distributed along the direction from the kiln to the desulfurization and denitrification machine (14).

3. The energy-saving and environment-friendly kiln internal circulation smoke exhaust duct according to claim 1 is characterized by: The preheating section (3) is composed of a connecting end (10) and a preheating air pipe (11); the two connecting ends (10) are respectively connected to the drying section (2) and the heating section (4); and a plurality of preheating air pipes (11) are connected between the two connecting ends (10).

4. The energy-saving and environment-friendly kiln internal circulation smoke exhaust duct according to claim 3 is characterized by: The preheating air pipe (11) is in a plate-like structure and is made of ceramic material. A plurality of the preheating air pipes (11) are arranged at equal intervals from the upper right to the lower right, and a hot air layer (12) is formed between two adjacent preheating air pipes (11).

5. The energy-saving and environment-friendly kiln internal circulation smoke exhaust duct according to claim 3 is characterized by: The air inlet end (8) is located on a side of the preheating element (7) close to the drying section (2), and the air outlet end (9) is located on a side of the preheating element (7) close to the heating section (4).

6. The energy-saving and environment-friendly kiln internal circulation smoke exhaust duct according to claim 1 is characterized by: The connection position between the preheating element (7) and the preheating section (3) is fixedly connected by welding.

7. The energy-saving and environment-friendly kiln internal circulation smoke exhaust duct according to claim 1 is characterized by: The outer surfaces of the return air pipe (5) and the preheating element (7) are coated with a heat insulation coating.

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