Pushing system and method for protecting the walls of a furnace head

Abstract

The present application relates to a kind of pushing coke system and method with the protection of furnace head wall, pushing coke system includes coke pushing car, pushing coke rod and hot air supply device, the push rod of pushing coke rod is equipped with hot air passage and the hot air cavity in the push head is communicated;Hot air supply device is composed of external hot air pipeline, heat exchange device and air extraction pump;Air extraction pump is connected by pipeline and is equipped with heat exchange device in coke oven flue, heat exchange device is connected by external hot air pipeline and the hot air passage of push rod;Multiple hot air outlets are provided on the push head one;Multiple hot air outlets are provided on the push rod two.Pushing coke by the high-temperature air of heat exchange into carbonization chamber through pushing coke rod, form positive pressure environment at the furnace head of carbonization chamber, avoid inhaling cold air when pushing coke, maintain the temperature of the furnace head wall of carbonization chamber, prevent the damage of furnace head wall due to temperature fluctuation.

Description

Technical Field

[0001] This invention relates to the field of coke oven coking technology, and in particular to a coke pushing system and method that protects the furnace head wall. Background Technology

[0002] Modern coke ovens are mainly side-entry type. After a long period of dry distillation, the coal cake is transformed into coke product, which is then pushed out from the coke side by a coke pusher car on the machine side. The coke pusher car is equipped with a coke pushing device. During coke pushing, the head of the pushing rod of the pushing device lightly touches the end face of the coke cake. At the beginning, the pushing speed is slow. When the pushing rod starts, the coke cake is compressed, and the pushing resistance reaches its maximum value.

[0003] During long-term use, coke ovens are subjected to high temperatures, mechanical forces, and chemical reactions, causing gradual changes in various parts of the oven body. These changes primarily manifest as varying degrees of cracks, erosion, deformation, caverns, and even partial collapse on the oven wall surface. The end flues of the combustion chamber typically suffer the earliest and fastest damage. The main reason for the faster damage to the end flues is that the furnace head area of ​​the carbonization chamber is kept open for extended periods during coke pushing, causing a rapid drop in the furnace head wall temperature. After coal charging, the oven door closes, causing the furnace head wall temperature to rise rapidly again. This drastic temperature fluctuation generates thermal stress, making the furnace head wall more susceptible to erosion and cracking. Summary of the Invention

[0004] This invention provides a coke pushing system and method that protects the furnace head wall. During coke pushing, high-temperature air after heat exchange is introduced into the carbonization chamber through the coke pushing rod, forming a positive pressure environment at the furnace head of the carbonization chamber. This prevents cold air from being drawn in during coke pushing, maintains the temperature of the furnace head wall of the carbonization chamber, and prevents damage to the furnace head wall due to drastic temperature fluctuations.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A coke pushing system that protects the furnace head wall includes a coke pushing car and a coke pushing rod. The coke pushing rod is mounted on the coke pushing car and consists of a push rod and a push head located at the end of the push rod. The push rod has a hot air channel inside, and the push head has a hot air chamber inside, with the hot air chamber of the push head connected to the hot air channel of the push rod. The coke pushing system also includes a hot air supply device. The hot air supply device consists of an external hot air duct, a heat exchange device, and an air extraction pump. The air outlet of the air extraction pump is connected to the air inlet of the heat exchange device located in the coke oven flue through a duct. The high-temperature air outlet of the heat exchange device is connected to the hot air channel of the push rod through an external hot air duct. The side of the push head that does not contact the coke has multiple hot air outlets (I); the end of the push rod connected to the push head has multiple hot air outlets (II).

[0007] Furthermore, the heat exchange device is a plate heat exchanger, a partitioned heat exchanger, a floating head heat exchanger, or a shell-and-tube heat exchanger.

[0008] Furthermore, the pusher head, push rod, and external hot air duct are all made of high-temperature resistant metal materials.

[0009] Furthermore, the external hot air duct is equipped with a flow control valve at one end near the push rod, and the control end of the flow control valve is connected to the coke pushing control system.

[0010] Furthermore, the external hot air duct includes a coke oven side hot air duct and a coke pusher car hot air duct. One end of the coke oven side hot air duct is connected to a heat exchange device, and the other end of the coke oven side hot air duct is detachably and sealed to one end of the coke pusher car hot air duct through a top pipe interface device. The other end of the coke pusher car hot air duct is detachably and sealed to the hot air channel of the pusher rod.

[0011] Furthermore, the furnace top pipe interface device is a sealed box, with quick-connect interfaces at both ends of the sealed box that are sealed and connected to the corresponding coke oven side hot air pipe and coke pusher car hot air pipe.

[0012] Furthermore, the hot air duct of the coke pusher car and the push rod are connected by a socket-type sliding connection, and a sealing structure is provided at the connection.

[0013] A coke pushing method that protects the furnace head wall involves the following steps: During the coke pushing process, ambient air drawn from the atmosphere by an air extraction pump exchanges heat with the high-temperature flue gas in the coke oven's flue gas duct via a heat exchange device. The high-temperature air after heat exchange is then sent to the coke pushing rod through an external hot air duct and into the corresponding carbonization chamber through multiple hot air outlets 1 on the back of the pusher head and multiple hot air outlets 2 at the end of the pusher rod. As the distance the coke pushing rod moves into the carbonization chamber increases, the flow rate of hot air from the pusher head and pusher rod increases accordingly, creating a positive pressure environment at the furnace head of the carbonization chamber to prevent the intake of cold air during coke pushing, which would lower the temperature of the furnace head wall.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) When pushing coke, high-temperature air after heat exchange is introduced into the carbonization chamber through the coke pushing rod to form a positive pressure environment at the furnace head of the carbonization chamber, so as to avoid the intake of cold air during coke pushing, maintain the temperature of the furnace head wall of the carbonization chamber, and prevent the furnace head wall from being damaged due to drastic temperature fluctuations.

[0016] (2) The heat supplied to the high-temperature gas in the carbonization chamber comes from the exhaust gas in the coke oven flue, which saves energy and improves the efficiency of waste heat utilization of coke oven flue gas.

[0017] (3) High-temperature gas is introduced from inside the push rod, which can avoid high-temperature deformation caused by the large temperature difference between the inside and outside of the push rod due to prolonged exposure to the high-temperature environment of the carbonization chamber. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the coke pushing system that protects the furnace head wall as described in this invention.

[0019] Figure 2 This is a schematic diagram of the coke pusher car pipeline interface described in this invention.

[0020] In the diagram: 11. Coke oven flue; 12. Exhaust gas switch; 13. Coke oven side door; 14. Machine side door; 15. Coke oven foundation; 16. Coke pusher car; 17. Coal box; 18. Carbonization chamber; 22. Air extraction pump; 23. Heat exchanger; 24. Coke oven side hot air duct; 25. Hot air outlet one; 31. Pusher head; 32. Push rod; 33. Oven top pipe interface device; 34. Coke pusher car hot air duct; 35. Hot air outlet two. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0022] like Figure 1 As shown, the coke pushing system of the present invention, which protects the furnace head wall, includes a coke pushing car 16 and a coke pushing rod. The coke pushing rod is mounted on the coke pushing car 16 and consists of a push rod 32 and a push head 31 located at the end of the push rod 32. The push rod 32 has a hot air channel inside, and the push head 31 has a hot air chamber inside, and the hot air chamber of the push head 31 is connected to the hot air channel of the push rod 32. The coke pushing system also includes a hot air supply device. The hot air supply device consists of an external hot air pipe, a heat exchange device 23, and an air extraction pump 22. The air outlet of the air extraction pump 22 is connected to the air inlet of the heat exchange device 23 located in the coke oven flue 11 through a pipe. The high-temperature air outlet of the heat exchange device 23 is connected to the hot air channel of the push rod 32 through an external hot air pipe. The side of the push head 31 that does not contact the coke has multiple hot air outlets 1-25. The end of the push rod 32 connected to the push head 31 has multiple hot air outlets 2-35.

[0023] Furthermore, the heat exchange device 23 is a plate heat exchanger, a partition wall heat exchanger, a floating head heat exchanger, or a shell and tube heat exchanger.

[0024] Furthermore, the push head 32, push rod 31, and external hot air duct are all made of high-temperature resistant metal materials.

[0025] Furthermore, the external hot air duct is equipped with a flow control valve at one end near the push rod 32, and the control end of the flow control valve is connected to the coke pushing control system.

[0026] Furthermore, the external hot air duct includes a coke oven side hot air duct 24 and a coke pusher car hot air duct 34. One end of the coke oven side hot air duct 24 is connected to a heat exchange device 23, and the other end of the coke oven side hot air duct 24 is detachably and sealed to one end of the coke pusher car hot air duct 34 through a furnace top pipe interface device 33. The other end of the coke pusher car hot air duct 34 is detachably and sealed to the hot air channel of the pusher rod 32.

[0027] Furthermore, the furnace top pipe interface device 33 is a sealed box, and quick interfaces are respectively provided at both ends of the sealed box to be sealed and connected to the corresponding coke oven side hot air pipe 24 and coke pusher car hot air pipe 34.

[0028] Furthermore, such as Figure 2 As shown, the hot air duct 34 of the coke pusher car and the push rod 32 are connected by a socket sliding connection, and a sealing structure is provided at the connection.

[0029] like Figure 1 As shown, the coke pushing method of the present invention, which protects the furnace head wall, involves the following process: During the coke pushing process, ambient air drawn from the atmosphere by the air extraction pump 22 exchanges heat with the high-temperature flue gas in the coke oven flue 11 through the heat exchange device 23. The high-temperature air after heat exchange is then sent to the coke pushing rod through an external hot air pipe and into the corresponding carbonization chamber 18 through multiple hot air outlets 25 on the back of the pusher head 31 and multiple hot air outlets 35 at the end of the pusher rod 32. As the distance the coke pushing rod moves into the carbonization chamber 18 increases, the flow rate of hot air sent from the pusher head 31 and the pusher rod 32 increases accordingly, creating a positive pressure environment at the furnace head of the carbonization chamber 18 to prevent the intake of cold air during coke pushing, which would lower the temperature of the furnace head wall of the carbonization chamber 18.

[0030] like Figure 1 As shown, the side-loading coke oven (tamping coke oven) consists of alternating combustion chambers and carbonization chambers 18. A small flue is located at the bottom of the combustion chamber and connected to the coke oven branch flue 11 via a waste gas switch 12. The lowest part of the coke oven is the coke oven foundation 15. During coke pushing operation, the coke pusher 16 moves to the machine side of the corresponding carbonization chamber 18. After the machine side furnace door 14 and the coke side furnace door 13 of the corresponding carbonization chamber 18 are opened, the pusher rod extends into the carbonization chamber 18 to push the coke out from the coke side. The coke pusher is usually a coal-charging coke pusher, equipped with a coal box 17, which also functions to load coal into the carbonization chamber 18.

[0031] The present invention discloses a coke pushing system that protects the furnace head wall, comprising a coke pushing car, a coke pushing rod, and a hot air supply device; the coke pushing rod includes a pusher head 31 and a pusher rod 32; a hot air outlet is provided at the end of the pusher rod 32 connected to the pusher head 31 and on the back side of the pusher head 31 that does not contact the coke.

[0032] In the push rod, the push head 31 is located at the end of the push rod 32, forming a T-shaped structure. The push rod 32 is a hollow rod with a hot air channel inside; the push head 31 is a hollow structure with a hot air cavity inside, and the hot air channel of the push rod 32 is connected to the hot air cavity of the push head 31; the other end of the push rod 32 is connected to an external hot air duct.

[0033] The external hot air duct is divided into two sections: the coke oven side hot air duct 24 and the coke pusher car hot air duct 34. The coke pusher car hot air duct 34 is located on the coke pusher car 16. The two external hot air ducts are temporarily connected by the furnace top duct interface device 33 before coke pushing. The furnace top duct interface device 33 preferably has a sealed box structure. The two ends of the sealed box are provided with quick interfaces to seal and connect with the coke oven side hot air duct 24 and the coke pusher car hot air duct 34.

[0034] like Figure 2 As shown, the hot air duct 34 of the coke pusher car and the push rod 32 are connected by a socket-type sealing structure, and the two are connected by a sliding seal.

[0035] During the coke pushing process, ambient air drawn from the atmosphere is heated by the heat exchanger 23 and then flows through the hot air duct 24 on the coke oven side and the hot air duct 34 on the coke pushing car to the coke pushing rod. The air is then delivered into the carbonization chamber 18 through the hot air outlets on the pusher rod 32 and the pusher head 31. The flow control valve on the external hot air duct is interlocked with the coke pushing control system. As the coke pushing rod moves deeper into the carbonization chamber 18, the hot air flow rate increases accordingly to prevent cold air from entering the carbonization chamber 18, ensuring that the furnace wall temperature at the furnace head does not drop significantly and preventing damage to the furnace head wall due to drastic temperature fluctuations.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pushing method for protecting the walls of a furnace head, characterized in that, The application discloses a coke pushing system for protecting the wall of a coke oven, which comprises a coke pushing vehicle and a coke pushing rod, wherein the coke pushing rod is arranged on the coke pushing vehicle, and the coke pushing rod is composed of a pushing rod and a pushing head arranged at the end of the pushing rod; the inside of the pushing rod is provided with a hot air channel, and the inside of the pushing head is provided with a hot air cavity, and the hot air cavity of the pushing head is communicated with the hot air channel of the pushing rod; the coke pushing system further comprises a hot air supply device; the hot air supply device is composed of an external hot air pipeline, a heat exchange device and an air extraction pump; the air outlet of the air extraction pump is connected with the air inlet of the heat exchange device arranged in the coke oven flue through a pipeline, and the high-temperature air outlet of the heat exchange device is connected with the hot air channel of the pushing rod through the external hot air pipeline; the end surface of the side of the pushing head, which is not in contact with the coke, is provided with a plurality of hot air outlets I; and the end of the pushing rod, which is connected with the pushing head, is provided with a plurality of hot air outlets II. During the coke pushing process, the normal-temperature air extracted from the atmosphere by the air extraction pump is exchanged with the high-temperature flue gas in the coke oven flue through the heat exchange device, and the high-temperature air after the heat exchange is sent into the coke pushing rod through the external hot air pipeline, and then is sent into the corresponding carbonization chamber through the plurality of hot air outlets I arranged on the back surface of the pushing head and the plurality of hot air outlets II arranged at the end of the pushing rod; with the increase of the moving distance of the coke pushing rod into the carbonization chamber, the hot air flow rate sent from the pushing head and the pushing rod is correspondingly increased, so that a positive pressure environment is formed at the wall of the carbonization chamber, and the cold air is avoided from being inhaled during the coke pushing process to reduce the temperature of the wall of the carbonization chamber.

2. A pushing method for protecting the walls of the furnace front according to claim 1, characterized in that, The heat exchange device is a plate heat exchanger, a partition heat exchanger, a floating head heat exchanger or a tube heat exchanger.

3. A pushing method for protecting the walls of the furnace front according to claim 1, characterized in that, The pushing head, the pushing rod and the external hot air pipeline are all made of high-temperature resistant metal materials.

4. The method of pushing a coke according to claim 1, wherein, The external hot air pipeline is provided with a flow control valve at the end close to the pushing rod, and the control end of the flow control valve is connected with a coke pushing control system.

5. The method of pushing a coke charge according to claim 1, wherein, The external hot air pipeline comprises a coke oven side hot air pipeline and a coke pushing vehicle hot air pipeline, one end of the coke oven side hot air pipeline is connected with the heat exchange device, the other end of the coke oven side hot air pipeline is detachably and sealingly connected with one end of the coke pushing vehicle hot air pipeline through a coke oven top pipeline interface device, and the other end of the coke pushing vehicle hot air pipeline is detachably and sealingly connected with the hot air channel of the pushing rod.

6. A pushing method for protecting the walls of the furnace front according to claim 5, characterized in that, The coke oven top pipeline interface device is a sealing box body, and the two ends of the sealing box body are respectively provided with quick interfaces and are sealingly connected with the corresponding coke oven side hot air pipeline and coke pushing vehicle hot air pipeline.

7. A pushing method for protecting the walls of a furnace head according to claim 5, characterized in that, The coke pushing vehicle hot air pipeline and the pushing rod are in a socket joint sliding connection, and a sealing structure is arranged at the joint.

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