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CN-116447888-B - Annealing furnace top heating device

CN116447888BCN 116447888 BCN116447888 BCN 116447888BCN-116447888-B

Abstract

The invention discloses a top heating device of an annealing furnace, which comprises a top cover, wherein a cavity is arranged in the middle of the top cover, a plurality of spray pipes communicated with the outside of the lower side of the top cover are arranged at the bottom of the cavity, a gas pipe communicated with the outside of the upper side of the top cover is arranged at the top of the cavity, an oxygen pipe is communicated with the side wall of the gas pipe, the top heating device further comprises a plurality of auxiliary gas pipe assemblies consisting of branch pipes, annular gas collecting pipes and a main pipe, the lower end of each branch pipe is communicated with the outside of the lower side of the top cover, the upper end of each branch pipe is communicated with the gas collecting pipe, the gas collecting pipes are arranged in the cavity, the side wall of each branch pipe is communicated with one end of the main pipe, the other end of the main pipe is positioned outside the top cover and provided with gas source interfaces, and the plurality of spray pipes and the lower ends of the branch pipes are uniformly distributed on the lower surface of the top cover. The invention uses a fuel gas heating mode to spray flame downwards and can ensure flame stabilization, thereby having the advantages of low cost and reliable operation.

Inventors

  • DENG WEIHONG
  • LI XU

Assignees

  • 洛阳久盛冶金材料加工有限公司

Dates

Publication Date
20260512
Application Date
20230315

Claims (8)

  1. 1. A top heating device of an annealing furnace comprises a top cover (1), and is characterized in that a cavity (2) is arranged in the middle of the top cover (1), a plurality of spray pipes (21) communicated with the outside of the lower side of the top cover (1) are arranged at the bottom of the cavity (2), a gas pipe (22) communicated with the outside of the upper side of the top cover (1) is arranged at the top of the cavity (2), and an oxygen pipe (23) is communicated with the side wall of the gas pipe (22); The auxiliary air pipe assembly comprises a plurality of branch pipes (31), annular air collecting pipes (32) and a main pipe (33), wherein the lower end of each branch pipe (31) is communicated with the outside of the lower side of the top cover (1), the upper end of each branch pipe is communicated with the air collecting pipe (32), the air collecting pipe (32) is arranged in the cavity (2), the side wall of the air collecting pipe is communicated with one end of the main pipe (33), and the other end of the main pipe (33) is positioned outside the top cover (1) and is provided with an air source interface (331); The lower ends of the spray pipes (21) and the branch pipes (31) are uniformly distributed on the lower surface of the top cover (1).
  2. 2. The annealing furnace top heating device according to claim 1, wherein a cooling water channel (4) is further arranged at the lower part of the top cover (1), and a water inlet (41) and a water outlet (42) which are communicated with the cooling water channel (4) are further arranged on the top cover (1).
  3. 3. The annealing furnace top heating apparatus according to claim 2, wherein said nozzle (21) and said branch pipe (31) extend through said cooling water channel (4).
  4. 4. The annealing furnace top heating device according to claim 3, further comprising an exhaust pipe (5), wherein the exhaust pipe (5) penetrates through the top cover (1) from bottom to top, the upper end of the exhaust pipe is communicated with a flue gas collecting pipeline (51), and a valve (52) is arranged on the exhaust pipe (5) positioned outside the upper side of the top cover (1).
  5. 5. The annealing furnace top heating device according to claim 4, further comprising an ignition mechanism (6), wherein the ignition mechanism (6) is detachably inserted into a preset insertion hole of the top cover (1), and the lower end of the ignition mechanism extends out of the lower side of the top cover (1) and is used for igniting fuel gas sprayed out from the lower end of the spray pipe (21).
  6. 6. The annealing furnace top heating device according to claim 5, wherein a clamping head (11) is arranged on the periphery of the lower surface of the top cover (1), and the clamping head (11) can be inserted into a clamping groove preset at the upper end of the furnace body (7) of the annealing furnace.
  7. 7. The annealing furnace top heating device according to claim 6, wherein the upper end of the top cover (1) is provided with a lifting lug (12) for connecting lifting equipment.
  8. 8. The annealing furnace top heating device according to any one of claims 1 to 7, wherein the gas introduced into the gas source interface (331) is oxygen, and a control valve is further arranged on the gas source interface (331) for controlling the input amount of the oxygen.

Description

Annealing furnace top heating device Technical Field The invention belongs to the technical field of electrolytic aluminum production, and particularly relates to a top heating device of an annealing furnace. Background In the electrolytic aluminum industry, according to the current cathode pouring development trend, the annealing furnace can be used for replacing large-scale carbon block heating pouring. However, the existing annealing furnace only has bottom heating and side heating, is generally used for quenching and tempering annealing of castings, lacks top heating, and cannot meet the requirement of cathode heating. In order to avoid repeated investment and save cost, the existing annealing furnace is expected to be upgraded and reformed so as to have the function of top heating and meet the heating requirement of cathode carbon blocks. For this reason, the technical means generally adopted include that an electric heating wire is additionally arranged on the furnace top cover, but the carbon block is a poor conductor of heat, so that the heating time is longer, the consumed electric energy is larger, and the cost is high. In the prior art, a fuel gas heating mode is adopted. However, the problem faced by the gas heating is that in order to avoid the oxidation of the carbon block, the ratio of the gas to the oxygen must be precisely controlled so that the oxygen can be fully consumed. Furthermore, the fuel gas is usually in an anoxic combustion state, and particularly in a combustion stage after the fuel gas enters the furnace body, the combustion flame state is difficult to control, the flame is unstable, and the flameout phenomenon is easy to occur. Disclosure of Invention In order to overcome the defects in the background art, the invention provides a top heating device of an annealing furnace, and aims to adopt a fuel gas heating mode to set a spraying mechanism on the lower surface of a top cover, spray flame downwards from the top of a furnace body and ensure flame stabilization. In order to achieve the above purpose, the present invention provides the following technical solutions: the top heating device of the annealing furnace comprises a top cover, a cavity, a gas pipe and a heating device, wherein the top cover is used for covering the upper end of a furnace body; The auxiliary air pipe assembly comprises a plurality of branch pipes, annular air collecting pipes and a main pipe, wherein the lower end of each branch pipe is communicated with the outside of the lower side of the top cover, and the upper end of each branch pipe is communicated with the air collecting pipe; the lower ends of the spray pipes and the branch pipes are uniformly distributed on the lower surface of the top cover. As further optimization, the lower part of the top cover is also provided with a cooling water channel, and the top cover is also provided with a water inlet and a water outlet which are communicated with the cooling water channel. As a further optimization, the spray pipe and the branch pipe penetrate through the cooling water channel. The flue gas collecting device is further optimized and further comprises an exhaust pipe, the exhaust pipe penetrates through the top cover from bottom to top, the upper end of the exhaust pipe is communicated with a flue gas collecting pipeline, and a valve is arranged on the exhaust pipe which is positioned outside the upper side of the top cover. The gas burner is further optimized and further comprises an ignition mechanism, wherein the ignition mechanism is detachably inserted into a preset jack of the top cover, and the lower end of the ignition mechanism extends out of the lower side of the top cover and is used for igniting gas sprayed out from the lower end of the spray pipe. As further optimization, the periphery of the lower surface of the top cover is provided with a clamping head, and the clamping head can be inserted into a clamping groove preset at the upper end of the furnace body of the annealing furnace. As further optimization, the upper end of the top cover is provided with a lifting lug for connecting lifting equipment. The gas source interface is further optimized to be connected with oxygen, and a control valve is further arranged on the gas source interface and used for controlling the input quantity of the oxygen. The invention has the beneficial effects that: (1) The gas heating speed is high, the heating efficiency is high, and the cost is low. (2) Only the top cover on the furnace body is replaced, so that the furnace body has a top heating function and is suitable for upgrading and reforming the old furnace body. (3) The gas combustion is sufficient, the flame is stable, flameout is not easy, the unconsumed oxygen is less, and the oxidation to heated articles in the furnace body is reduced. In a word, the device uses a fuel gas heating mode to spray flame downwards, and can ensure flame stabilization, so that the device has the advantages of lo