Sintering ignition device using pulverized coal as fuel

Abstract

The utility model relates to a sintering ignition device with pulverized coal as fuel, which structurally comprises a pulverized coal conveying pipe, a combustion-supporting pipe, an air mixing chamber, a pulverized coal ignition furnace and an igniter, the air mixing chamber is positioned above the pulverized coal ignition furnace, the air mixing chamber is communicated with the pulverized coal conveying pipe and the combustion-supporting pipe, and the pulverized coal conveying pipe is communicated with the combustion-supporting pipe. The air mixing chamber is arranged in the pulverized coal ignition furnace and is directly or indirectly communicated with the pulverized coal ignition furnace, a flow guide plate is arranged in the pulverized coal ignition furnace and is used for dispersing and guiding flames entering the pulverized coal ignition furnace, a plurality of igniters are arranged on the pulverized coal ignition furnace, and the igniters are communicated with the pulverized coal ignition furnace. And the igniter is used for ejecting flame downwards to ignite the mixture in the sintering pallet. A transition chamber is arranged between the air mixing chamber and the pulverized coal ignition furnace, a lower port of the transition chamber corresponds to the upper end of the guide plate, a fire barrier is arranged in the transition chamber, and a plurality of through holes are evenly formed in the fire barrier. The sintering ignition device can stabilize sintering ignition operation.

Description

Technical Field

[0001] The utility model relates to a sintering ignition device, in particular to a sintering ignition device using coal powder as fuel. Background Art

[0002] In the sintering production line, the sintering igniter is used to ignite the sintering material surface. The specific process is as follows: the sintering igniter is set behind the sintering mixed material bin and on the sintering trolley. The sintering mixture has been equipped with a certain proportion of fuel, generally coke powder or anthracite. The sintering mixture is first transported to the mixed material bin by a belt conveyor, and then the mixture is evenly distributed on the sintering trolley by a distributor, and a certain segregation occurs. The sintering trolley continues to move forward on the sintering machine to the bottom of the igniter. After the igniter receives the blast furnace gas or mixed gas generated by other production workshops in the steel plant, it is mixed with the combustion-supporting air and ignited. It is sprayed to the sintering material surface through many igniters. After the fuel on the sintering material surface is ignited, the sintering trolley continues to move forward and leaves the igniter. At the same time, there is a certain gap between the steel grates at the bottom of the sintering trolley. The bellows under the trolley draws air downward through a certain negative pressure, and the ignited material surface is sintered downward until all the material layers are burned through. At the same time, the sintering trolley also moves to the sintering end point.

[0003] The temperature and flame intensity required for sintering ignition are within a range of values. If the ignition intensity is too low, the surface of the sintering mixture cannot be successfully ignited and the sintering operation cannot be completed; if the ignition intensity is too high, the sintering material panel will form a hard shell, blocking the air from being drawn downward from the surface of the sintering material layer by negative pressure, resulting in poor permeability of the material layer, which is not conducive to the downward sintering process of the mixture. At the same time, the gas fuel used in the sintering ignition operation is a by-product of other production departments, and the supply is unstable. The pressure at the receiving point often changes due to changes in the production situation of other departments, and the ignition intensity also changes accordingly, resulting in the ignition temperature and flame intensity being difficult to control, affecting the continuous sintering production.

[0004] In order to keep the sintering ignition intensity within a relatively reasonable range when the gas pressure changes, it is necessary to continuously adjust the opening of the gas regulating valve and the matching combustion air regulating valve. Even when the gas pressure is too low, in order to prevent the flame in the ignition furnace from going out due to the low gas pressure, and the gas from being not ignited and consumed and causing leakage, a quick shut-off valve is generally provided to automatically cut off the gas source when the gas pressure is too low, causing the sintering production to stop.

[0005] If there is a stable fuel source as a special fuel for sintering ignition, and the fuel amount and pressure can be actually adjusted according to the sintering production needs, the instability of sintering production caused by the unstable sintering fuel source can be avoided to the greatest extent and unnecessary fuel consumption can be minimized.

[0006] At present, there is no equipment specifically used to solve the problem of unstable gas pressure for sintering ignition. The conventional solution is that steel enterprises build gas cabinets or gas pressure stations to store transit gas or increase gas pressure. However, these two measures are generally used for steel enterprises with abundant gas output or long gas transportation distance, and are not targeted to solve the problem of unstable sintering ignition pressure. Utility Model Content

[0007] The utility model aims to provide a sintering ignition device using coal powder as fuel, so as to solve the problem of unstable sintering ignition pressure in the existing sintering ignition using coal gas as fuel.

[0008] The utility model is implemented as follows: a sintering ignition device using coal powder as fuel, comprising a coal powder conveying pipe, a combustion-supporting pipe, an air mixing chamber, a coal powder ignition furnace and an igniter, wherein the air mixing chamber is located above the coal powder ignition furnace, the air mixing chamber is connected to the coal powder conveying pipe and the combustion-supporting pipe, and the air mixing chamber is directly or indirectly connected to the coal powder ignition furnace, a guide plate is arranged in the coal powder ignition furnace, the guide plate is used to disperse and guide the flame entering the coal powder ignition furnace, a plurality of igniters are arranged on the coal powder ignition furnace, the igniters are used to spray flames downward to ignite the mixture in the sintering trolley.

[0009] For the sintering ignition device using pulverized coal as fuel of the utility model, a transition chamber is arranged between the air mixing chamber and the pulverized coal ignition furnace, the lower port of the transition chamber corresponds to the upper end of the guide plate, a fire baffle wall is arranged in the transition chamber, and a plurality of through holes are evenly opened on the fire baffle wall.

[0010] For the sintering ignition device using coal powder as fuel of the utility model, the guide plate forms a divergent flame channel.

[0011] For the sintering ignition device using coal powder as fuel of the utility model, an exhaust bellows is arranged below the sintering trolley.

[0012] For the sintering ignition device using coal powder as fuel of the utility model, a furnace dispersing device is arranged on the coal powder ignition furnace, and the furnace dispersing device comprises a quick connector connected to the inner cavity of the coal powder ignition furnace and a dispersing pipe.

[0013] For the sintering ignition device using coal powder as fuel of the utility model, a temperature sensor and a pressure sensor are arranged on the coal powder ignition furnace, a pressure sensor, a temperature sensor, a flow sensor and an oxygen content sensor are arranged on the combustion-supporting tube, and a pressure sensor, a temperature sensor and a flow sensor are arranged on the coal powder conveying pipe.

[0014] For the sintering ignition device using coal powder as fuel of the utility model, a combustion-supporting fan is arranged on the combustion-supporting pipe, and a coal conveying fan is arranged on the coal powder conveying pipe.

[0015] For the sintering ignition device using coal powder as fuel of the utility model, a quantitative feeding device is arranged on the coal powder conveying pipe.

[0016] The utility model uses coal powder to provide fuel for the igniter of the sintering machine, and transports the coal powder from the coal powder bin to the coal conveying fan through a quantitative feeding device, and then the coal conveying fan transports the coal powder to the air mixing chamber, and at the same time, the combustion-supporting fan draws air from the outside as combustion-supporting air, and transports it to the air mixing chamber to mix with the coal powder airflow. At the same time, the temperature in the coal powder ignition furnace is about 1150°C during normal operation. When the coal powder enters the coal powder ignition furnace, it starts to spontaneously ignite to form a flame. Through the combined action of the fire baffle wall and the guide plate, the flame is evenly distributed above each igniter, and is sprayed to the sintering material surface through the igniter to ignite the sintering mixture. At the same time, the ash formed after the combustion of the coal powder falls to the sintering material surface through the ash falling hole in the igniter and is sintered with the mixture.

[0017] The utility model can control the negative pressure of the sintering igniter fuel by adjusting the coal conveying fan, and can stabilize the sintering ignition operation. When the sintering raw material conditions change, the actual fuel amount required by the raw material conditions can be adjusted to prevent the ignition intensity from being too high, thereby reducing the consumption of ignition fuel and reducing the carbon consumption per ton of sintering ore, which is more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model.

[0019] Figure 2 It is a structural diagram of the fire retaining wall of the utility model.

[0020] Figure 3 yes Figure 2 Side view of.

[0021] In the figure: 1. Pulverized coal conveying pipe; 2. Combustion-supporting air duct; 3. Air mixing chamber; 4. Pulverized coal ignition furnace; 5. Transition chamber; 6. Guide plate; 7. Fire baffle; 8. Dosing device; 9. Coal conveying fan; 10. Combustion-supporting fan; 11. Ignition device; 12. Sintering trolley; 13. Exhaust bellows; 14. Quick connector; 15. Vent pipe; 16. Data processing device; 7-1. Through hole. DETAILED DESCRIPTION

[0022] The utility model will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1As shown, the sintering ignition device using pulverized coal as fuel of the utility model comprises a pulverized coal conveying pipe 1, a combustion-supporting pipe, an air mixing chamber 3, a pulverized coal ignition furnace 4 and an igniter 11. The air mixing chamber 3 is located above the pulverized coal ignition furnace 4. The air mixing chamber 3 is connected to the pulverized coal conveying pipe 1 and the combustion-supporting pipe, and the air mixing chamber 3 is directly or indirectly connected to the pulverized coal ignition furnace 4. A guide plate 6 is arranged in the pulverized coal ignition furnace 4. The guide plate 6 is used to disperse and guide the flame entering the pulverized coal ignition furnace 4. A plurality of igniters 11 are arranged on the pulverized coal ignition furnace 4. The igniters 11 are used to spray flames downward to ignite the mixture in the sintering trolley 12.

[0024] The sintering trolley 12 is located below the pulverized coal ignition furnace 4 . The sintering trolley 12 is filled with sintering mixture, and the surface of the sintering mixture faces the end of the igniter 11 .

[0025] The pulverized coal is transported to the air mixing chamber 3 through the pulverized coal conveying pipe 1. At the same time, the combustion-supporting pipe transports combustion-supporting gases such as air into the air mixing chamber 3. The combustion-supporting gas is mixed with the pulverized coal airflow in the air mixing chamber 3. The fully mixed airflow enters the pulverized coal ignition furnace 4. Since the temperature in the pulverized coal ignition furnace 4 is about 1150°C during normal operation, the pulverized coal begins to spontaneously combust into a flame when it enters the pulverized coal ignition furnace 4.

[0026] Among them, the guide plate 6 forms a tree-like divergent flame channel. When the flame passes through the guide plate 6, it is evenly dispersed into the pulverized coal ignition furnace 4 under the guidance of the tree-like divergent channel, so as to be evenly distributed above each igniter 11, and is evenly sprayed onto the sintering material surface through the igniter 11 to ignite the sintering mixture.

[0027] In order to further improve the uniformity of the flame, the sintering ignition device of the utility model is further improved. A transition chamber 5 is provided between the air mixing chamber 3 and the pulverized coal ignition furnace 4. The lower end of the transition chamber 5 is connected to the pulverized coal ignition furnace 4, and the lower end of the transition chamber 5 corresponds to the upper end of the guide plate 6. Figure 2 , Figure 3 As shown, a fire retaining wall 7 is arranged in the transition chamber 5, and a plurality of through holes 7-1 are evenly opened on the fire retaining wall 7.

[0028] The cross section of the through hole 7 - 1 is circular, elliptical, triangular, square or other special-shaped structures.

[0029] Because the temperature of the pulverized coal ignition furnace 4 is about 1150°C when it works normally, the temperature in the transition chamber 5 is also higher than the temperature at which the pulverized coal spontaneously ignites. The pulverized coal begins to burn when it enters the transition chamber 5, and the formed flame passes downward through the fire baffle wall 7 under the pressure provided by the coal conveying fan 9. After the flame is blocked by the fire baffle wall 7, its flame core is shortened, which can protect the guide plate 6 below. At the same time, the fire baffle wall 7 can absorb the heat of the flame for heat storage, keeping the transition chamber 5 continuously at a temperature above 800°C, satisfying the conditions for the spontaneous combustion of pulverized coal.

[0030] The fire baffle 7 and the guide plate 6 work together to evenly distribute the flame above each igniter 11, thereby achieving even spraying of the flame.

[0031] An exhaust bellows 13 is provided below the sintering trolley 12 . The exhaust bellows 13 forms a certain negative pressure below the sintering trolley 12 , which is beneficial for the flame to spray downward onto the sintering mixture surface of the sintering trolley 12 .

[0032] As a further improvement of the sintering ignition device in this specific embodiment, a furnace dissipation device is provided on the pulverized coal ignition furnace 4 , and the furnace dissipation device includes a quick connector 14 connected to the inner cavity of the pulverized coal ignition furnace 4 and a dissipation pipe 15 .

[0033] When the equipment is completed or the sintering machine is ready to start up after a long shutdown, the coal powder ignition furnace 4 can be heated and dried by connecting it to an external gas fuel through the quick connector 14 of the drying furnace venting device. The ignition furnace is heated to above 800°C to meet the natural conditions of the coal powder. The waste gas generated in the process is discharged from the venting pipe 15.

[0034] A combustion-supporting fan 10 is provided on the combustion-supporting pipe, and a coal conveying fan 9 is provided on the pulverized coal conveying pipe 1. A quantitative feeding device 8 is provided on the pulverized coal conveying pipe 1.

[0035] The combustion-supporting fan 10 and the coal conveying fan 9 may be variable frequency fans, and the quantitative feeding device 8 may be a Fuller pump.

[0036] The air volume of the combustion-supporting gas is controlled by the combustion-supporting fan 10 , and the supply amount of the pulverized coal is controlled by the quantitative feeding device 8 and the coal conveying fan 9 .

[0037] The igniter 11 is specifically a burner, the number of which is set according to actual needs. The upper part is connected to the pulverized coal ignition furnace 4, and an adjusting valve is provided in the middle to spray the pulverized coal flame ignited in the ignition furnace to the sintering material surface.

[0038] As an embodiment of the utility model, the sintering ignition device is further improved. A temperature sensor and a pressure sensor are provided on the pulverized coal ignition furnace 4, a pressure sensor, a temperature sensor, a flow sensor and an oxygen content sensor are provided on the combustion-supporting tube, and a pressure sensor, a temperature sensor and a flow sensor are provided on the pulverized coal conveying pipe 1.

[0039] The temperature and pressure sensors are arranged inside the coal injection ignition furnace to detect the temperature and pressure of the flame ejected from the igniter 11 in real time, and the signal is fed back to the data processing device 16. The required amount of coal powder and the amount of combustion-supporting air required for burning the coal powder are calculated according to the set ignition negative pressure and temperature, and the signals are fed back to the combustion-supporting fan 10, the coal conveying fan 9, and the quantitative feeding device 8 through signal transmission. The above equipment is adjusted to meet the required requirements. Furthermore, the sensor in the combustion-supporting pipe detects the pressure, temperature, flow rate, and oxygen content of the combustion-supporting air, and the coal powder conveying pipe 1 detects the pressure, temperature, and flow rate of the coal powder airflow, which are transmitted to the data processing device 16 through signals for verification. After verification, the calculation is recalculated, and fine-tuning and fitting are performed to adjust the parameters to further meet the set ignition conditions.

[0040] The most suitable combustion-supporting air volume can be obtained by calculating the output of pulverized coal. The patent CN219178275U "A sintering igniter 11 automatic control gas and combustion-supporting air device" can be referred to. The combustion medium and excess oxygen coefficient therein can be replaced with the corresponding parameters of pulverized coal. The following principle can also be used:

[0041] According to the combustion chemical formula of the effective ingredients in coal powder: C+O2=CO2, S+O2=SO2, the chemical composition of the produced coal powder is first tested to obtain its fixed carbon content W1, the carbon element content in the fixed carbon W2, and the sulfur element content W3. The coal powder output in the receiving equipment is M1, of which the mass of the combustible carbon is M1×W1×W2, and the mass of the sulfur is M1×W1×W3. According to the chemical formula of carbon and sulfur combustion, the total required oxygen mass M2 is M1×W1×(8 / 3W2+W3). The oxygen concentration in the combustion-supporting air can be detected in the combustion-supporting air duct as W4, the combustion-supporting air temperature is Q1, and the delivery air pressure is P1. According to the above conditions, the standard molar volume V1 corresponding to O2 under the conditions of Q1 and P1 can be found in the "Handbook of Thermophysical Properties of Commonly Used Engineering Materials". The excess oxygen coefficient of coal powder combustion is η, and the required combustion-supporting air volume is M1×W1×(8 / 3W2+W3)×V1 / (32×W4×η). The flow sensor in the combustion-supporting air duct can be used to detect data and feed it back to the data processing device to achieve real-time matching of the combustion of combustion-supporting air and coal powder, so as to meet the control of sintering ignition temperature and ignition pressure.

[0042] The utility model can control the negative pressure of the fuel of the sintering igniter 11 by adjusting the coal conveying fan 9, and can stabilize the sintering ignition operation. When the sintering raw material conditions change, the actual amount of fuel required by the raw material conditions can be adjusted to prevent the occurrence of excessive ignition intensity, thereby reducing the consumption of ignition fuel, reducing the carbon consumption per ton of sintering ore, and being more energy-saving and environmentally friendly.

Claims

1. A sintering ignition device using coal powder as fuel, characterized in that: It includes a coal powder conveying pipe, a combustion-supporting pipe, an air mixing chamber, a coal powder ignition furnace and an igniter. The air mixing chamber is located above the coal powder ignition furnace. The air mixing chamber is connected to the coal powder conveying pipe and the combustion-supporting pipe, and the air mixing chamber is directly or indirectly connected to the coal powder ignition furnace. A guide plate is arranged in the coal powder ignition furnace, and the guide plate is used to disperse and guide the flame entering the coal powder ignition furnace. A plurality of igniters are arranged on the coal powder ignition furnace, and the igniters are used to spray flames downward to ignite the mixture in the sintering trolley.

2. The sintering ignition device using coal powder as fuel according to claim 1, characterized in that: A transition chamber is arranged between the air mixing chamber and the pulverized coal ignition furnace, a lower port of the transition chamber corresponds to the upper end of the guide plate, a fire baffle is arranged in the transition chamber, and a plurality of through holes are evenly opened on the fire baffle.

3. The sintering ignition device using coal powder as fuel according to claim 1, characterized in that: The guide plate forms a divergent flame channel.

4. The sintering ignition device using coal powder as fuel according to claim 1, characterized in that: An exhaust bellows is provided under the sintering trolley.

5. The sintering ignition device using coal powder as fuel according to claim 1, characterized in that: The pulverized coal ignition furnace is provided with a furnace dissipation device, and the furnace dissipation device comprises a quick connector communicated with the inner cavity of the pulverized coal ignition furnace and a dissipation pipe.

6. The sintering ignition device using coal powder as fuel according to claim 1, characterized in that: The pulverized coal ignition furnace is provided with a temperature sensor and a pressure sensor, the combustion-supporting tube is provided with a pressure sensor, a temperature sensor, a flow sensor and an oxygen content sensor, and the pulverized coal conveying pipe is provided with a pressure sensor, a temperature sensor and a flow sensor.

7. The sintering ignition device using pulverized coal as fuel according to claim 1, characterized in that: A combustion-supporting fan is arranged on the combustion-supporting pipe, and a coal conveying fan is arranged on the pulverized coal conveying pipe.

8. The sintering ignition device using coal powder as fuel according to claim 1, characterized in that: A quantitative feeding device is arranged on the pulverized coal conveying pipe.

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