Combined combustion device for baking main channel of blast furnace

Abstract

A cover plate of the combined combustion device is arranged above the main channel of the blast furnace through a support, a combined type baking furnace tube comprises a lower-layer double-tube baking furnace tube and an upper-layer single-tube baking furnace tube which are respectively communicated with a gas tube, and holes are formed in the opposite sides of the lower-layer double-tube baking furnace tube at intervals and face towards the lower portions of the two sides of the main channel. Holes are formed in the two sides of the upper-layer single-tube baking furnace tube and face the upper portions of the two sides of the main channel, the combined baking furnace tube is located below the cover plate and abuts against the blast furnace main channel, the T-shaped burner penetrates through the cover plate to be connected with the support, a burner body is located above the combined baking furnace tube, and the flame detection probe and the temperature thermocouple are fixed to the support at intervals and detect baking flames and temperature. And the controller is electrically connected with the T-shaped burner, the flame detection probe and the temperature thermocouple respectively and controls the gas flux of the combined oven tube. The device realizes the automatic control of the baking of the blast furnace main channel, improves the temperature control precision and the uniformity of the refractory baking temperature, ensures the service life of the main channel refractory, and meets the requirements of energy conservation and environmental protection.

Description

TECHNICAL FIELD

[0001] The utility model relates to a castable baking equipment technical field especially relates to a kind of combined combustion device for blast furnace main groove baking. BACKGROUND

[0002] The purpose of blast furnace main groove baking is to dry and heat the main groove castable to remove moisture, to avoid the moisture not removed in castable from causing water vapor to rapidly generate in the rapid heating process when high-temperature molten iron passes through, leading to the structure of refractory to crack, and finally to withstand the scouring of 1500℃ molten iron at 900℃ high-temperature state.

[0003] The current baking method is as follows: when the temperature is below 300℃, small fire baking pipes are evenly placed at the bottom of the groove for 2 days; when the temperature is above 300℃, 6-8 steel pipe type simple burners that deliver gas through rubber pipes are inserted into the groove through the groove edge, and are separately placed in a 20-meter main groove area for combustion, to bake to about 900℃, with a time of 4 days, and the total baking time is 6 days, and coke oven gas is used for gas. During the baking process, a simple splicing of Valen plate is used as a baking heat preservation cover for heat preservation.

[0004] The current blast furnace main groove baking method has the following defects:

[0005] 1) In terms of baking temperature requirements, only 6-8 steel pipe type simple burners are used for a 20-meter main groove area, and single-point combustion leads to insufficient temperature uniformity, which is prone to local high temperature and local low temperature, and the main groove castable in the local area cannot meet the baking requirements, which affects the service life of the main groove refractory;

[0006] 2) In terms of energy saving and emission reduction, the heat loss of this simple baking device is large, and the energy cannot be uniformly distributed in the groove, resulting in large temperature loss, which not only cannot effectively play a heat preservation role, but also easily causes waste of coke oven gas.

[0007] Based on the requirements of steel enterprises for improvement and optimization of blast furnace main groove baking process and the increasing requirements for safety, environmental protection, energy saving and emission reduction, there is a demand for energy saving, easy installation and intelligent control for blast furnace main groove baking. SUMMARY

[0008] The technical problem to be solved by the utility model is to provide a combined combustion device for blast furnace main groove baking, which overcomes the defects of traditional blast furnace main groove baking operation, realizes automatic control of blast furnace main groove baking, improves temperature control precision and uniformity of refractory baking temperature, ensures the service life of the main groove refractory, and meets the requirements of energy saving and environmental protection.

[0009] The utility model discloses a combined combustion device for high furnace main ditch baking, which comprises a combined baking furnace pipe, a T-shaped burner, a cover plate, a fire detection probe, a temperature measuring thermocouple and a controller.

[0010] Further, the lower double-tube baking furnace pipe of the combined baking furnace pipe is connected to a gas return circuit.

[0011] Further, the lower double-tube baking furnace pipe and the upper single-tube baking furnace pipe of the combined baking furnace pipe are provided with a triangular support frame.

[0012] Further, the lower double-tube baking furnace pipe and the upper single-tube baking furnace pipe of the combined baking furnace pipe are made of heat-resistant stainless steel pipes.

[0013] The combined combustion device for high furnace main ditch baking of the utility model has the advantages that the cover plate of the device is arranged above the high furnace main ditch through a support, the combined baking furnace pipe comprises a lower double-tube baking furnace pipe and an upper single-tube baking furnace pipe which are connected to gas pipes, the lower double-tube baking furnace pipe is provided with holes on opposite sides and faces downward to the two sides of the main ditch, the upper single-tube baking furnace pipe is provided with holes on the two sides and faces upward to the two sides of the main ditch, the combined baking furnace pipe is located below the cover plate and close to the high furnace main ditch, the T-shaped burner is connected to the support through the cover plate and the burner body is located above the combined baking furnace pipe, the fire detection probe and the temperature measuring thermocouple are fixed to the support and detect the baking flame and the temperature respectively, the controller is electrically connected to the T-shaped burner, the fire detection probe and the temperature measuring thermocouple and controls the gas flux of the combined baking furnace pipe. The device overcomes the defects of the traditional high furnace main ditch baking operation, realizes the automatic control of the high furnace main ditch baking, improves the temperature control precision and the uniformity of the baking temperature of the refractory material, ensures the service life of the main ditch refractory material and meets the requirements of energy saving and environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be explained further in detail in combination with the drawings and embodiments as follows:

[0015] Figure 1The utility model is used for the combined combustion device of the main groove baking of blast furnace.

[0016] Figure 2 The utility model is used for the combined combustion device of the main groove baking of blast furnace.

[0017] Figure 3 The utility model is used for the combined combustion device of the main groove baking of blast furnace. Specific embodiments

[0018] The utility model is used for the combined combustion device of the main groove baking of blast furnace. Figure 1 、 Figure 2 and Figure 3 The utility model is used for the combined combustion device of the main groove baking of blast furnace, including combined baking pipe 1, T type burner 2, apron 3, fire detection probe 4, temperature measuring thermocouple 5 and controller 6, apron 3 is established above blast furnace main groove 7 through support 31, combined baking pipe 1 includes lower double -walled baking pipe 12 and upper single -walled baking pipe 13 that communicate respectively with gas pipe 11, gas pipe 11 is equipped with hand valve 14 respectively, lower double -walled baking pipe 12 and upper single -walled baking pipe 13 are arranged in triangle, the lower double -walled baking pipe 12 is apart from the side hole and is towards the lower direction of the both sides of blast furnace main groove 7, the upper single -walled baking pipe 13 both sides hole and are towards the upper direction of the both sides of blast furnace main groove 7, combined baking pipe 1 is located below apron 3 and is close to blast furnace main groove 7, T type burner 2 passes through apron 3 and is connected support 31 and burner body is located above combined baking pipe 1, fire detection probe 4 and temperature measuring thermocouple 5 are fixedly separated in support 31 and respectively detect baking flame and temperature, controller 6 is electrically connected with T type burner 2, fire detection probe 4 and temperature measuring thermocouple 5 respectively, and the gas flux of combined baking pipe 1 is controlled.

[0019] Preferably, the lower double -walled baking pipe 12 end of combined baking pipe 1 communicates and constitutes gas return circuit.

[0020] Preferably, the lower double -walled baking pipe 12 and upper single -walled baking pipe 13 of combined baking pipe 1 are provided with triangular support frame 15.

[0021] Preferably, the lower double -walled baking pipe 12 and upper single -walled baking pipe 13 of combined baking pipe 1 are heat -resistant stainless steel pipes.

[0022] The traditional baking process of the main groove of the blast furnace has the defects of high energy consumption, poor safety, uneven baking temperature of the castable, and affecting the service life. The combined combustion device is composed of a combined baking furnace pipe and a T-shaped burner. The combined baking furnace pipe can be assembled and disassembled. The baking process is divided into four zones. The device is arranged in the 20-meter main groove of the blast furnace. The controller is used for combustion and electrical control. The device has the characteristics of automatic baking control, high temperature control precision, and high uniformity of refractory temperature, and meets the requirements of energy saving and environmental protection.

[0023] The device is combined by a combined baking furnace pipe and a T-shaped burner. The device is connected with a coal gas and air pipeline system. The device is controlled by combustion and electricity to realize precise baking control according to the baking curve.

[0024] The combined baking furnace pipe is designed in a double-layer structure and is made of heat-resistant stainless steel pipe. The pipe is arranged close to the main groove of the blast furnace. The double-layer baking furnace pipe is controlled by two valves. The lower baking furnace pipe is designed in a loop and is opened on one side, and the pipe is directed to the lower side of the two sides of the main groove of the blast furnace. The upper baking furnace pipe is designed in a single pipe and is opened on both sides, and the pipe is directed to the upper side of the two sides of the main groove of the blast furnace. The opening direction of the upper and lower baking furnace pipes and the flame of the T-shaped burner can ensure that the refractory in the main groove of the blast furnace is evenly heated during baking.

[0025] The baking temperature of the refractory in the main groove of the blast furnace is from room temperature to the highest process temperature of 900℃. The temperature is detected by a temperature measuring thermocouple. The free water in the refractory is baked out gradually during the low-temperature baking process. The temperature needs to be slowly increased. Considering the actual process requirements, a small fire is needed during the low-temperature baking process below 300℃. The flame covers the refractory at the bottom and both sides of the main groove. At this time, the lower baking furnace pipe and the T-shaped burner are opened to burn. More heat is needed during the medium-high temperature baking process above 500℃. The coverage of the flame and the amount of fuel gas are increased. At this time, the upper baking furnace pipe is also opened to burn.

[0026] The combined baking furnace pipe is manually ignited. The fire detection probe provided on the furnace cover can be used for monitoring during the working process. The T-shaped burner is equipped with an electronic igniter through the controller to realize automatic ignition, automatic combustion adjustment, automatic control of the whole process of fire extinguishing alarm and re-ignition, etc.

[0027] The device is arranged in four zones. The combined baking method can be used according to different temperature sections. The gas flow of the combined baking furnace pipe in each zone can be independently controlled according to the needs. The gas and air of the burner and the baking furnace pipe are mixed well, the combustion is complete, the uniform baking of the refractory in the main groove is realized, and the temperature control precision is ensured within ±10℃.

[0028] Considering the different baking requirements of the low-temperature section and the high-temperature section, the device adopts combined baking furnace pipes and T-shaped burners for combined combustion, adjusts conveniently, safely and reliably through different combustion combination modes to meet the baking process requirements, ensures the temperature control accuracy in the baking process, realizes the uniformity of the temperature rising speed and the overall lining temperature in the main groove refractory baking process, solves the problems of insufficient single-point combustion temperature uniformity, easy local temperature overhigh and local temperature low caused by the traditional use of single-point steel pipe simple burner, overcomes the defects that the local main groove castable cannot reach the baking requirements, and helps to improve the service life of the main groove refractory after baking.

[0029] The device can realize automatic temperature control of the whole process such as ignition, automatic adjustment of combustion, extinguishing alarm and re-ignition, and the controller has a manual / automatic switching function to realize the automation and electrification of the baking process and improve the intelligent operation and maintenance level. At the same time, the process flow is adjusted and controlled according to the baking process curve, the heat supply of each temperature stage is met, therefore, the energy waste caused by excessive heat in the initial baking stage can be greatly reduced, and the energy supply in the final baking stage can also be increased to ensure that the baking temperature is reached, and the purpose of energy saving and consumption reduction is realized.

Claims

1. A combined combustion device for baking in the main trench of a blast furnace, Its features are: The system includes a combined baking furnace tube, a T-shaped burner, a cover plate, a flame detector, a thermocouple, and a controller. The cover plate is mounted above the main blast furnace trench via a bracket. The combined baking furnace tube comprises a lower double-tube baking furnace tube and an upper single-tube baking furnace tube, each connected to a gas pipe. Each gas pipe is equipped with a manual valve. The lower double-tube baking furnace tube and the upper single-tube baking furnace tube are arranged in a triangular pattern. The lower double-tube baking furnace tube has openings on its opposing sides, facing downwards towards both sides of the main blast furnace trench. The upper single-tube baking furnace tube has openings on both sides, facing upwards towards both sides of the main blast furnace trench. The combined baking furnace tube is located below the cover plate and close to the main blast furnace trench. The T-shaped burner passes through the cover plate and is connected to the bracket, with the burner body positioned above the combined baking furnace tube. The flame detector and thermocouple are fixed at intervals to the bracket and respectively detect the baking flame and temperature. The controller is electrically connected to the T-shaped burner, the flame detector, and the thermocouple, and controls the gas flow rate of the combined baking furnace tube.

2. The combined combustion device for blast furnace main trench baking according to claim 1, Its features are: The lower double-tube oven tube of the combined oven tube is connected at its end to form a gas circuit.

3. The combined combustion device for blast furnace main trench baking according to claim 1 or 2, Its features are: The lower double-tube drying tube and the upper single-tube drying tube of the combined drying oven tube are provided with triangular support frames at intervals.

4. The combined combustion device for blast furnace main trench baking according to claim 3, Its features are: The lower double-tube drying oven tube and the upper single-tube drying oven tube of the combined drying oven tube are heat-resistant stainless steel tubes.

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