Preheating air anti-blocking pipeline

Abstract

The utility model discloses a preheating air anti-blocking pipeline which comprises an air pipe, a collecting hopper is arranged at the air inlet low end of the air pipe and communicates with the air pipe, a cooling pipe is installed at the bottom of the collecting hopper, and a plurality of cooling air pipes transversely arranged in a penetrating mode are arranged in the cooling pipe. The bottom of the cooling pipe is installed on an air chute through a discharging pipe, a gate valve is installed on the discharging pipe, a reducer pipe is arranged at the air direction rear end of the air pipe located in the collecting hopper, and the diameter of the reducer pipe is set from large to small. The collecting structure is additionally arranged at the air pipe, dust is collected at the hot air alternating position, the total dust amount entering the preheating utilization system is reduced, and therefore the purpose of delaying shutdown cleaning is achieved, it can be guaranteed that cleaning and overhaul are conducted at the same time, and the cleaning efficiency is improved. The heat exchange efficiency of the heat exchange system in the long-time operation process is further improved, and therefore the good production efficiency is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology in cement production process, and in particular to a preheating air anti-clogging pipe. Background Technology

[0002] Waste heat utilization in cement kilns is an important way for the cement industry to save energy and reduce emissions. By recovering the waste heat emitted from the kiln system for power generation or heating, energy efficiency can be significantly improved and production costs reduced. The waste heat mainly comes from the clinker cooler at the kiln head and the preheater at the kiln tail, with a temperature between 200-400 degrees Celsius. Steam is generated through the waste heat boiler to drive the steam turbine generator set to generate electricity, which can meet the internal power needs of some cement plants. Therefore, waste heat recovery is one of the important energy-saving and emission-reduction measures for cement plants.

[0003] Because the hot air coming out of the cement kiln head contains a small amount of dust, the dust that adheres to it after a period of operation affects heat exchange, and a large amount of dust also accumulates in the hot air duct, it is necessary to carry out maintenance and cleaning to improve heat exchange efficiency and ventilation efficiency. However, simply shutting down the machine to clean the hot air duct is not in line with the company's efficiency. At present, the cleaning of hot air ducts is mainly carried out in conjunction with the major overhaul of the plant. Therefore, we have proposed a preheated air anti-blockage duct to solve the above problems. Utility Model Content

[0004] This application provides a preheating air anti-clogging duct, which solves the problem that dust can easily accumulate quickly during waste heat recovery, affecting heat exchange efficiency and production efficiency.

[0005] This application provides a preheating air anti-clogging duct, including an air duct, a collection hopper is provided at the air inlet of the air duct, the collection hopper is connected to the air duct, a cooling pipe is installed at the bottom of the collection hopper, a plurality of horizontally connected cooling air ducts are provided inside the cooling pipe, the bottom of the cooling pipe is installed on an air chute through a discharge pipe, and a gate valve is installed on the discharge pipe.

[0006] Preferably, a variable diameter pipe is provided at the rear end of the air duct of the collection hopper, and the diameter of the variable diameter pipe is set from large to small.

[0007] Preferably, a negative pressure chamber is installed at one end of the cooling pipe located in the cooling air duct. An opening is provided on one side of the negative pressure chamber, and a sealing plate is detachably provided at the opening. A negative pressure air duct is also connected to one side of the negative pressure chamber. One end of the negative pressure air duct is connected to a negative pressure device, and a gate valve is installed on the negative pressure air duct.

[0008] Preferably, the opening of the negative pressure chamber is provided with a groove, and the sealing plate is installed in the groove.

[0009] Preferably, the collecting hopper is provided with a heat insulation layer.

[0010] Preferably, the cooling duct is made of stainless steel.

[0011] Preferably, multiple temperature sensors are vertically mounted on the cooling pipe.

[0012] Preferably, a thickened layer is provided on one side of the cooling pipe.

[0013] As can be seen from the above technical solution, this application provides a preheating air anti-blockage pipe. In use, this application is installed at the connection between the air outlet and the air duct of the cement kiln. The hot air of the cement kiln is transmitted to the heat exchange unit through the air duct. When installing the air duct, it is only necessary to ensure that the end of the air outlet of the cement kiln is lower than the end of the heat exchange unit. Some dust will accumulate in the air duct and then fall into the cooling pipe through the collection hopper. Since the hot air moves along the air duct, the cooling pipe is less affected by temperature except for the collection hopper. Moreover, the cooling pipe is suspended and will not affect the surrounding personnel. Therefore, when the temperature in the cooling pipe is not higher than 150℃, normal air cooling can be used. After the dust accumulates for a period of time, the gate valve and air chute can be opened to send the dust in the cooling pipe to the raw material silo for use as cement raw material. Since some dust falls into the cooling pipe, it can effectively reduce the dust accumulation in other links, thus reducing the amount of dust accumulation in the waste heat recovery system and improving the circulation efficiency and heat exchange efficiency of the hot air. It can be cleaned during normal overhaul.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. By setting up collection hoppers and cooling pipes, collection hoppers are added at the initial stage of hot air flow and at the location where airflow changes, which can collect some dust and reduce the amount of dust brought into the heat exchange system.

[0016] 2. By setting up the air chute, when ash needs to be discharged, the ash in the cooling pipe can be discharged to the raw material silo for reuse without closing the air duct.

[0017] In summary, this application adds a collection structure to the air duct to collect dust at the alternation point of hot air, thereby reducing the total amount of dust entering the preheating and utilization system, thus delaying the shutdown for cleaning. This not only ensures that cleaning and overhaul can be carried out simultaneously, but also further improves the heat exchange efficiency of the heat exchange system during long-term operation, thereby ensuring better production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a preheating air anti-clogging pipe proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the installation structure of a temperature sensor for a preheating air anti-clogging pipeline proposed in this utility model;

[0021] In the diagram: 1. Air duct, 2. Collection hopper, 3. Cooling pipe, 4. Feeding pipe, 5. Slide valve, 6. Air chute, 7. Negative pressure air duct, 8. Gate valve, 9. Cooling air duct, 10. Negative pressure chamber, 11. Slide, 12. Sealing plate, 13. Reducing pipe, 14. Temperature sensor, 15. Thickened layer. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0023] See Figure 1-2 A preheating air anti-clogging duct includes an air duct 1 connected to the hot air outlet of a cement kiln in a cement production system. The air duct 1 is used to collect hot air from the cement kiln. During installation, the air duct 1 is inclined, with the hot air outlet in the cement kiln at a lower position and the preheating system end at a higher position. A collection hopper 2 is installed at the lower end of the air duct 1 near the cement kiln. At this location, the initial airflow velocity is turbulent, and dust easily settles and accumulates. Therefore, dust is collected at this location. The collection hopper 2 is connected to the air duct 1, and the dust generated at this location falls into the collection hopper 2. Because this location is in contact with the air duct 1, it is prone to causing blockages. To reduce heat loss, an insulation layer is installed on the collection hopper 2. A cooling pipe 3 is installed at the bottom of the collection hopper 2 to collect the falling dust. Since the dust temperature is high, the accumulated heat is not easily dissipated. Multiple horizontally connected cooling air ducts 9 are installed inside the cooling pipe 3. The air flowing into the cooling air ducts 9 cools the dust in the cooling pipe 3. Under normal circumstances, the amount of dust is small, and the cooling by natural wind can meet the preset requirements. The cooling air ducts 9 are made of stainless steel, which can effectively reduce rusting and improve cooling efficiency.

[0024] The bottom of the cooling pipe 3 is installed on the air chute 6 via the discharge pipe 4. The dust accumulation in the cooling pipe 3 is relatively high and will affect dust settling. The dust in the cooling pipe 3 needs to be cleaned regularly. Since the air duct 1 is in continuous operation, the dust in the cooling pipe 3 is recycled through the air chute 6 and sent to the raw material silo or fly ash silo for use as cement raw material. A slide valve 5 is installed on the discharge pipe 4. The opening and closing of the discharge pipe 4 is controlled by the slide valve 5. The slide valve 5 only needs to be opened and cleaned about once every 15 days.

[0025] The setup in this application can greatly reduce the dust entering the waste heat utilization system. In fact, under normal wind speed and high heat exchange efficiency, it can be cleaned during the overhaul process in the plant area. It is worth noting that the cooling pipe 3 is made of iron plate and is fixed with bolts. During the overhaul, if the cooling pipe 3 needs to be cleaned or repaired, it can be disassembled by removing the bolts.

[0026] In this invention, in order to further improve the dust settling efficiency, a variable diameter pipe 13 is provided at the rear end of the air duct 1 of the collection hopper. The diameter of the variable diameter pipe 13 is set from large to small, and the hot air settles further at the variable diameter pipe 13.

[0027] In this invention, a negative pressure chamber 10 is installed at one end of the cooling pipe 3 located in the cooling air duct 9. An opening is provided on one side of the negative pressure chamber 10. Under normal circumstances, the opening is in a normally open state, and the cooling air duct 9 is cooled by natural wind. A sealing plate 12 is detachably installed at the opening. When the temperature of the cooling pipe 3 cannot be reduced to the set state, a negative pressure air duct 7 is also connected to one side of the negative pressure chamber 10. One end of the negative pressure air duct 7 is connected to a negative pressure device. The flow rate through the cooling air duct 9 is accelerated by an external negative pressure air source, thereby achieving the purpose of cooling. A gate valve 8 is installed on the negative pressure air duct 7. Since opening the negative pressure air source will affect other equipment, the negative pressure air duct 7 is closed by the gate valve 8 under normal circumstances. The setting of the negative pressure air duct 7 can effectively solve the impact of abnormal temperature on the cooling pipe 3.

[0028] Furthermore, a groove 11 is provided at the opening of the negative pressure chamber 10, and a sealing plate 12 is installed in the groove 11. The opening and closing of the opening is controlled by pulling the sealing plate 12.

[0029] Furthermore, in order to better monitor the cooling pipe 3, multiple temperature sensors 14 are vertically installed on the cooling pipe 3 to monitor the temperature of the cooling pipe 3 at a vertical position, so as to avoid abnormally high temperature of the cooling pipe 3.

[0030] In this utility model, a thickened layer 15 is also provided on one side of the cooling pipe 3. During normal ash removal, the thickened layer 15 can be knocked with a stick to achieve the purpose of ash removal.

[0031] As can be seen from the above technical solution, when this application is used, it is installed at the connection between the air outlet of the cement kiln and the air duct 1. The hot air of the cement kiln is transmitted to the heat exchange unit through the air duct 1. When installing the air duct 1, it is only necessary to ensure that one end of the air outlet of the cement kiln is lower than the other end of the heat exchange unit. Some dust will be deposited in the air duct 1 and then fall into the cooling pipe 3 through the collection hopper 2. Since the hot air moves along the air duct 1, the cooling pipe 3 is less affected by temperature except for the collection hopper 2. Moreover, the cooling pipe 3 is suspended and will not affect the surrounding personnel. Therefore, when the temperature in the cooling pipe 3 is not higher than 150℃, normal air cooling can be used. After the dust accumulates for a period of time, the gate valve 5 and the air chute 6 can be opened to send the dust in the cooling pipe 3 to the raw material silo for use as cement raw material. Since some dust falls into the cooling pipe 3, it can effectively reduce the dust accumulation in other links, thus reducing the amount of dust accumulation in the waste heat recovery system and improving the circulation efficiency and heat exchange efficiency of the hot air. It can be cleaned during normal overhaul.

[0032] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0033] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this application described above do not constitute a limitation on the scope of protection of this application.

Claims

1. A preheating air anti-clogging duct, comprising an air duct (1), characterized in that: A collection hopper (2) is provided at the air inlet of the air duct (1). The collection hopper (2) is connected to the air duct (1). A cooling pipe (3) is installed at the bottom of the collection hopper (2). Multiple horizontally connected cooling air ducts (9) are provided inside the cooling pipe (3). The bottom of the cooling pipe (3) is installed on the air chute (6) through the discharge pipe (4). A slide valve (5) is installed on the discharge pipe (4).

2. The preheating air anti-clogging pipe according to claim 1, characterized in that, A variable diameter pipe (13) is provided at the rear end of the air duct (1) located in the collection hopper, and the diameter of the variable diameter pipe (13) is set from large to small.

3. The preheating air anti-clogging pipe according to claim 1, characterized in that, The cooling pipe (3) is located at one end of the cooling air duct (9) and a negative pressure chamber (10) is also installed. An opening is provided on one side of the negative pressure chamber (10), and a sealing plate (12) is detachably provided at the opening. A negative pressure air duct (7) is also connected to one side of the negative pressure chamber (10). One end of the negative pressure air duct (7) is connected to a negative pressure device, and a gate valve (8) is installed on the negative pressure air duct (7).

4. A preheating air anti-clogging pipe according to claim 3, characterized in that, The opening of the negative pressure chamber (10) is provided with a chute (11), and the sealing plate (12) is installed in the chute (11).

5. A preheating air anti-clogging pipe according to claim 1, characterized in that, The collection hopper (2) is provided with a heat insulation layer.

6. A preheating air anti-clogging pipe according to claim 1, characterized in that, The cooling duct (9) is made of stainless steel.

7. A preheating air anti-clogging pipe according to claim 1, characterized in that, Multiple temperature sensors (14) are vertically mounted on the cooling pipe (3).

8. A preheating air anti-clogging pipe according to claim 1, characterized in that, A thickened layer (15) is also provided on one side of the cooling pipe (3).

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