Preparation method of flame path sealing element of prebaked anode roasting furnace

Abstract

The invention discloses a method for preparing a flame path sealing element of a prebaked anode roasting furnace, which comprises the following steps of: extending plastic cloth into a flame path transverse wall socket between two furnace chambers along a flame path opening, and adsorbing the plastic cloth to the transverse wall socket by utilizing negative pressure in the flame path to realize the sealing between the furnace chambers; according to the preparation method of the flame path sealing element of the prebaked anode roasting furnace, the sealing effect can be improved, the negative pressure in the furnace chamber is stable, the situation of negative pressure loss is avoided, various environmental protection index data of a desulfurization system are stable, and the purposes of greenness, low carbon, environmental protection and ultralow emission are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of prebaked anode production, in particular to a method for preparing a flue seal of a prebaked anode baking furnace. Background Art

[0002] The open annular roasting furnace for prebaked carbon anode for aluminum is composed of multiple furnace chambers with the same structure. The carbon blocks to be roasted are placed in the material box, which is surrounded by heating fire channels and cross walls on both sides and front and back of the material box. The fire channel is a heating fire wall. The hot air flow transfers the heat to the roasted products in the material box through the fire wall. Multiple fire retaining walls are set in each fire channel. The heat inside the fire channel comes from the external fuel and the volatile matter discharged from the roasted carbon blocks, etc., and the air volume is added through the blower and preheated by the furnace chamber.

[0003] When the open annular carbon prebaked anode roasting furnace is in operation, each flame system moves to the next furnace chamber when it reaches a combustion cycle according to the production tasks and process technology requirements. During the movement, the sealing baffles connecting each fire channel in the cross wall of the entire system to the next furnace chamber must be pulled out and replaced with the plug-in plate of the next furnace chamber cross wall to ensure that the system operates under sufficient negative pressure in each fire channel.

[0004] The existing sealing baffle is made of iron plate. After long-term use, the sealing baffle or the cross wall refractory brick will be deformed, the sealing effect will deteriorate, resulting in insufficient negative pressure in the combustion system, and incomplete combustion of the fuel and volatiles supplied by the system, causing disorder in the operation of the combustion system, posing safety hazards and unstable emission data of desulfurization environmental protection indicators. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a method for preparing a flue seal of a pre-baked anode baking furnace, which can increase the sealing effect, ensure the stability of the negative pressure in the furnace chamber, avoid the loss of negative pressure, and effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method for preparing a flue seal of a pre-baked anode baking furnace, extending a plastic sheet along the flue opening to the cross wall socket of the flue between two furnace chambers, and utilizing the negative pressure inside the flue to be adsorbed at the cross wall socket position to achieve sealing between the furnace chambers.

[0007] As a preferred technical solution of the present invention, when the plastic sheet enters the fire channel, wooden sticks are used to support the two ends of the plastic sheet until the plastic sheet completely covers the position of the horizontal wall socket.

[0008] As a preferred technical solution of the present invention, one end of the plastic sheet extends out of the fire channel opening and is pressed against the fire channel opening by a refractory sleeve.

[0009] As a preferred technical solution of the present invention, the plastic sheet is made of polyvinyl chloride material.

[0010] As a preferred technical solution of the present invention, the size of the plastic sheet is 180 cm in length and 50 cm in width.

[0011] As a preferred technical solution of the present invention, the plastic sheet extends out of the fire channel by at least 15 cm.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the preparation method of the fire channel seal of the pre-baked anode baking furnace is reasonably designed and ingeniously conceived. The original iron plate is replaced with plastic cloth to reduce material consumption. At the same time, the plastic cloth is adsorbed on the cross wall socket under negative pressure conditions. Compared with the rigid seal, the sealing effect of the furnace surface system is greatly improved, the combustion system is fully burned, the energy consumption of natural gas is reduced, and the environmental protection indicators of the desulfurization system are relatively stable, achieving the purpose of green, low-carbon, environmentally friendly and ultra-low emissions. At the same time, the use of calcium hydroxide is saved and the production operation cost is reduced. DETAILED DESCRIPTION

[0013] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] The present invention provides a technical solution: a method for preparing a flue seal of a pre-baked anode baking furnace, wherein a plastic sheet is extended along the flue opening to the cross wall socket of the flue between two furnace chambers, and the negative pressure inside the flue is used to absorb the plastic sheet at the cross wall socket to achieve sealing between the furnace chambers.

[0015] In order to ensure the convenience of covering with plastic sheet, wooden sticks are used to support both ends of the plastic sheet when the plastic sheet enters the fire channel until the plastic sheet completely covers the position of the cross wall socket.

[0016] In order to prevent the plastic sheet from shifting, one end of the plastic sheet extends out of the fire channel opening and is pressed tightly at the fire channel opening through a refractory sleeve.

[0017] In order to save material costs, the plastic sheeting is made of waste polyvinyl chloride material, which is easy to obtain and does not require complicated processing.

[0018] In order to ensure full coverage of the cross wall socket, the size of the plastic sheet is 180 cm long and 50 cm wide. The length and width of the plastic sheet are much larger than the size of the cross wall socket.

[0019] In order to facilitate the fixing and removal of the plastic sheet, the plastic sheet extends out of the fire channel by at least 15 cm.

[0020] The present invention uses the original iron plate as a sealing baffle inserted at each socket of the cross wall to seal the negative pressure of the system. Now, it is changed below the first fire channel opening of the furnace room, and the used plastic cloth is cut into the size that meets the sockets of each cross wall of the furnace room, so that it is sucked and tightly attached to the connection between the two furnace rooms along the fire channel opening under the state of slight negative pressure. When moving the combustion system, the moving time is shortened, and the step of opening the cover plate at each fire channel socket of the cross wall is omitted. Each time the cross wall cover plate is opened, the insulation cotton is damaged, the labor intensity of the operator is reduced, the sealing effect is greatly improved, and the sealing of the furnace surface system is improved at the same time, and the negative pressure loss and air leakage are reduced from -30pa to below -5pa. The negative pressure of each fire channel of the combustion system is sufficient and can be adjusted according to demand, so that the fuel and volatile matter supplied by the system can be fully burned; the oxygen content in the flue gas is greatly reduced, and the oxygen content in the flue gas is reduced from 17.5% to below 16%; the ignition phenomenon in the roasting system is eliminated, and the safe and stable operation of the roasting system is guaranteed, and the green emission of various environmental protection indicators of the desulfurization system is stable.

[0021] 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 method for preparing a flue seal for a prebaked anode baking furnace, characterized in that: Extend the plastic sheet along the fire channel opening to the fire channel cross wall socket between the two furnace chambers, and use the negative pressure inside the fire channel to adsorb it at the cross wall socket position to achieve sealing between the furnace chambers.

2. The method for preparing a flue seal for a prebaked anode baking furnace according to claim 1, characterized in that: When the plastic sheet enters the fire channel, wooden sticks are used to support the two ends of the plastic sheet until the plastic sheet completely covers the position of the horizontal wall socket.

3. The method for preparing a flue seal of a prebaked anode baking furnace according to claim 1, characterized in that: One end of the plastic sheet extends out of the fire channel opening and is pressed tightly at the fire channel opening through a fire-resistant sleeve.

4. The method for preparing a flue seal for a prebaked anode baking furnace according to claim 1, characterized in that: The plastic sheet is made of polyvinyl chloride material.

5. The method for preparing a flue seal for a prebaked anode baking furnace according to claim 1, characterized in that: The size of the plastic sheet is 180 cm long and 50 cm wide.

6. The method for preparing a flue seal for a prebaked anode baking furnace according to claim 3, characterized in that: The plastic sheet extends out of the fire channel by at least 15 cm.