Long pipe type decomposing furnace

Abstract

The utility model discloses a long pipe type decomposing furnace which comprises decomposing furnace pipe bodies, an air supply pipe and three rows of ejection pipes, the decomposing furnace pipe bodies are fixedly connected end to end through welding, the air supply pipe is communicated with the decomposing furnace pipe bodies, an auxiliary air pipe is installed on the surface of the air supply pipe, and the three rows of ejection pipes are communicated with the auxiliary air pipe. The auxiliary air pipe and the air supply pipe are symmetrically installed on the surface of the air supply pipe, the decomposition furnace pipe body is communicated with an ammonia water pipe, the three rows of spraying pipes are installed in the decomposition furnace pipe body, the three rows of spraying pipes are arranged in a spiral shape and are respectively communicated with the air supply pipe, the auxiliary air pipe and the ammonia water pipe, a plurality of spraying heads are arranged on the surfaces of the three rows of spraying pipes, and the spraying heads are communicated with the ammonia water pipe. The long tubular decomposing furnace is formed by the plurality of decomposing furnace tubes, so that the decomposing time and path of the raw materials can be prolonged, the raw materials can be fully decomposed, the quality of the clinker can be improved, repeated decomposition can be avoided, the long tubular decomposing furnace can fully utilize heat, and the waste of heat energy can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dry process cement clinker production, in particular to a long tube type decomposition furnace. Background Art

[0002] There are three main ways of producing nitrogen oxides in the new dry process cement kiln system: thermal, fuel and rapid nitrogen oxides. Since combustion is the main cause of nitrogen oxides, the basic method of its control is mainly formulated according to the characteristics of the combustion process. However, at present, in cement production, the air (i.e., tertiary air) from the grate cooler after cooling the clinker passes through the rotary kiln and mixes with the exhaust gas at the tail of the rotary kiln. As flue gas for combustion, its oxygen concentration is about 11%. When the flue gas enters the decomposition furnace from the bottom of the decomposition furnace, the oxygen content of the flue gas at the cone bottom of the decomposition furnace is relatively high, which will produce a large amount of nitrogen oxides. In order to reduce nitrogen oxides, a large amount of cold air and ammonia water are needed, which increases the thermal energy consumption of the decomposition furnace, and then increases the cost of clinker production. Utility Model Content

[0003] The purpose of the utility model is to provide a long tube decomposition furnace to solve the problems raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical solutions: a long tube calciner, comprising a calciner tube body, wherein a plurality of calciner tube bodies are provided and the ends of the calciner tube bodies are fixedly connected by welding, so as to ensure good sealing of the calciner, prevent leakage of clinker, and avoid the emission of harmful gases;

[0005] The decomposition furnace tube body is connected to an air supply pipe, an auxiliary air pipe is installed on the surface of the air supply pipe, the auxiliary air pipe and the air supply pipe are symmetrically installed on the surface of the air supply pipe, and the decomposition furnace tube body is connected to an ammonia water pipe;

[0006] The air supply pipe and the auxiliary air duct can cooperate to realize the double air supply of the decomposition furnace tube body, help control the temperature in the decomposition furnace, and ensure the stable decomposition and combustion of raw materials;

[0007] Three rows of spray pipes are installed inside the decomposition furnace tube body. The three rows of spray pipes are arranged in a spiral shape. The three rows of spray pipes are connected to the air supply pipe, the auxiliary air pipe, and the ammonia water pipe respectively. A plurality of spray nozzles are arranged on the surface of the three rows of spray pipes.

[0008] The use of three rows of ejection pipes and a number of nozzles can help the decomposition furnace process the raw material more fully, ensuring a more stable production of clinker.

[0009] Furthermore, a support ring is installed on the surface of the decomposition furnace tube body, and the lower part of the support ring is rotatably connected to a fixed seat. The fixed seat can keep the decomposition furnace in a tilted state, which is beneficial to the flow of clinker in the decomposition furnace and reduces the residue of clinker in the decomposition furnace.

[0010] Furthermore, a shaping rod is fixedly connected between the three rows of ejection pipes, and a reinforcing column is provided on the inner wall of the decomposition furnace tube body. The reinforcing column is connected to the three rows of ejection pipes to prevent the three rows of ejection pipes from deforming and blocking the movement of clinker.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] (1) By forming a long-tube calciner through a plurality of calciner tubes, the decomposition time and path of the raw material can be extended, ensuring that the raw material is fully decomposed, improving the quality of the clinker, and avoiding repeated decomposition. The long-tube calciner also makes more full use of heat and reduces the waste of heat energy.

[0013] (2) Through three rows of spray pipes and nozzles, air and ammonia water can be sprayed into the decomposition furnace tube body in a spiral shape, so that the air and ammonia water can contact the raw material in a spiral manner, the contact area is larger, and the generation of nitrogen oxides is reduced. BRIEF 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 cross-sectional view of the utility model.

[0016] In the figure: 1. decomposition furnace tube body; 2. support ring; 3. fixing seat; 4. clinker outlet pipe; 5. ammonia water pipe; 6. air supply pipe; 7. transfer pipe; 8. control valve; 9. auxiliary air duct; 10. feed head; 11. reinforcement column; 12. three rows of spray pipes; 13. shaping rod; 14. spray nozzle. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Example:

[0019] See also Figure 1-2 The utility model provides a technical solution: a long tube decomposition furnace, comprising a decomposition furnace tube body 1, wherein a plurality of decomposition furnace tube bodies 1 are provided and the ends of the decomposition furnace tube bodies 1 are fixedly connected by welding;

[0020] After welding, the multiple calciner tube bodies 1 are in a long tube shape, which can prolong the decomposition time of the calciner for the raw material, making the raw material decompose more thoroughly;

[0021] The decomposition furnace tube body 1 is connected to an air supply pipe 6, and an auxiliary air pipe 9 is installed on the surface of the air supply pipe 6. The auxiliary air pipe 9 is symmetrically installed on the surface of the air supply pipe 6. The decomposition furnace tube body 1 is connected to an ammonia water pipe 5;

[0022] The gas enters the decomposition furnace through the air supply pipe 6 and the auxiliary air pipe 9, which can reduce the reducing atmosphere in the decomposition furnace and improve the combustion efficiency. The ammonia water can reduce the pH value of the decomposition furnace and neutralize the nitrogen oxides.

[0023] Three rows of ejection pipes 12 are installed inside the decomposition furnace tube body 1. The three rows of ejection pipes 12 are arranged in a spiral shape. The three rows of ejection pipes 12 are connected to the air supply pipe 6, the auxiliary air pipe 9, and the ammonia water pipe 5 respectively. A plurality of nozzles 14 are arranged on the surface of the three rows of ejection pipes 12.

[0024] The three rows of spray pipes 12 can surround the raw material in the decomposition furnace, so that the cold air and ammonia water can be sprayed on the raw material more evenly, thereby improving the decomposition efficiency.

[0025] In this embodiment, if Figure 1 As shown, the left and right ends of the calciner tube body 1 are respectively connected to a clinker outlet pipe 4 and a feed head 10 . The raw material to be decomposed is fed into the calciner tube body 1 through the feed head 10 . The raw material to be decomposed is decomposed to form clinker, which is discharged through the clinker outlet pipe 4 .

[0026] In this embodiment, if Figure 1 As shown, a support ring 2 is installed on the surface of the decomposition furnace tube body 1, and a fixed seat 3 is rotatably connected to the lower part of the support ring 2. The fixed seat 3 is supported by a steel frame. The rotatable connection between the fixed seat 3 and the support ring 2 can keep the decomposition furnace tube body 1 in an inclined state, which is convenient for the discharge of clinker.

[0027] In this embodiment, if Figure 2 As shown, the three rows of ejection pipes 12 are fixedly connected with shaping rods 13 to prevent the three rows of ejection pipes 12 from spreading out, keep the three rows of ejection pipes 12 in a spiral state, and prevent the three rows of ejection pipes 12 from deforming.

[0028] In this embodiment, if Figure 2 As shown, the inner wall of the decomposition furnace tube body 1 is provided with a reinforcement column 11, and the reinforcement column 11 is connected to the three rows of ejection pipes 12, so that the three rows of ejection pipes 12 are fixed in the middle of the decomposition furnace tube body 1, preventing the three rows of ejection pipes 12 from moving in the decomposition furnace tube body 1, and avoiding the decomposition furnace tube body 1 from colliding with the three rows of ejection pipes 12.

[0029] In this embodiment, if Figure 1 As shown, the auxiliary air duct 9 is connected to a control valve 8 , and the control valve 8 is connected to the air supply pipe 6 via a transfer tube 7 , and the cold air flow rate of the auxiliary air duct 9 can be adjusted by the control valve 8 .

[0030] Specifically, when in use, the raw material to be decomposed is fed into the decomposition furnace tube body 1 from the feed head 10, the decomposition furnace is heated by fuel, and then the raw material is decomposed by heating, cold air enters the decomposition furnace tube body 1 through the air supply pipe 6, and is divided into two parts through the adapter tube 7 and the auxiliary air duct 9 and fed into the three rows of ejection pipes 12, ammonia water is fed into the three rows of ejection pipes 12 through the ammonia water pipe 5, and the long tube decomposition furnace composed of multiple sections of the decomposition furnace tube body 1 provides sufficient decomposition time for the decomposition of the raw material. The raw material moves along the inclined decomposition furnace while being decomposed under the action of the spray of cold air and ammonia water. The spiral three rows of ejection pipes 12 have a more comprehensive contact with the raw material through a number of nozzles 14, and the decomposition effect is better. When the raw material is processed into clinker, the clinker is discharged from the clinker outlet pipe 4.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A long tube calciner, characterized in that: It comprises a decomposition furnace tube body (1), wherein a plurality of decomposition furnace tube bodies (1) are provided and the ends of the decomposition furnace tube bodies (1) are fixedly connected by welding; The decomposition furnace tube body (1) is connected to an air supply pipe (6), an auxiliary air pipe (9) is installed on the surface of the air supply pipe (6), and the auxiliary air pipe (9) and the air supply pipe (6) are symmetrically installed on the surface of the air supply pipe (6), and the decomposition furnace tube body (1) is connected to an ammonia water pipe (5); Three rows of spray pipes (12) are installed inside the decomposition furnace tube body (1). The three rows of spray pipes (12) are arranged in a spiral shape. The three rows of spray pipes (12) are respectively connected to the air supply pipe (6), the auxiliary air pipe (9), and the ammonia water pipe (5). A plurality of spray heads (14) are arranged on the surface of the three rows of spray pipes (12).

2. A long tube calciner according to claim 1, characterized in that: The left and right ends of the decomposition furnace tube body (1) are respectively connected to a clinker outlet pipe (4) and a feed head (10).

3. A long tube calciner according to claim 1, characterized in that: A support ring (2) is installed on the surface of the decomposition furnace tube body (1), and a fixing seat (3) is rotatably connected to the lower part of the support ring (2).

4. The long tube calciner according to claim 1, characterized in that: A shaping rod (13) is fixedly connected between the three rows of ejection pipes (12).

5. The long tube calciner according to claim 1, characterized in that: The inner wall of the decomposition furnace tube body (1) is provided with a reinforcement column (11), and the reinforcement column (11) is connected to three rows of ejection pipes (12).

6. The long tube calciner according to claim 1, characterized in that: The auxiliary air duct (9) is connected to a control valve (8), and the control valve (8) is connected to the air supply duct (6) via a transfer tube (7).

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