A control device for a blast furnace gas diffuser tower and a method of use

Abstract

The present application relates to the field of diffusion tower, specifically to a blast furnace gas diffusion tower control device and use method, the blast furnace gas diffusion tower control device includes diffusion device, water seal device and drainage device, both sides of the water seal device are connected with gas pipeline, the gas pipeline of one side is communicated with blast furnace gas inlet pipe of the blast furnace gas diffusion tower, the gas pipeline of the other side is communicated with the diffusion device, both sides of the water seal device are respectively communicated with water supplement pipeline and drainage pipeline, the water supplement pipeline is installed with water supplement valve, the drainage pipeline is installed with drainage valve and the water seal device is communicated with the drainage device through the drainage pipeline, the present application realizes that the water seal device is full of water when not diffusing, the water level seals the gas, achieves zero leakage of the gas, the water seal device drains in advance when diffusing, ensures that the gas can be smoothly discharged, the whole control process does not need manual intervention operation, realizes automatic control of the whole process, achieves the purpose of saving gas.

Description

Technical Field

[0001] This invention relates to the field of venting towers, specifically a control device and method for using a blast furnace gas venting tower. Background Technology

[0002] Blast furnace gas venting towers are mainly used to release excess blast furnace gas and regulate the pressure of the gas pipeline network, thereby enabling users to utilize blast furnace gas stably and efficiently and ensuring the safe operation of the blast furnace gas pipeline network. Even when the gas pipeline network pressure is normal and the regulating valve is closed, a large amount of gas can still leak. Continuous gas leakage leads to significant energy waste and air pollution caused by non-venting CO emissions.

[0003] The current analysis suggests the following reasons for the large amount of gas:

[0004] 1. Due to the structural limitations of the regulating butterfly valve, even when it is displayed as fully closed, there is still a certain amount of leakage.

[0005] 2. The regulating butterfly valve has been operating online for a long time. Due to the long-term erosion of the valve plate sealing surface, wear has occurred, which has led to a gradual increase in the amount of blast furnace gas leaking internally.

[0006] 3. The actual on-site conditions mean that even without releasing the gas, there is still a problem of long-term continuous gas leakage. Summary of the Invention

[0007] This invention provides a control device for a blast furnace gas venting tower, which can solve the problems in the prior art. This invention provides the following technical solution:

[0008] A control device for a blast furnace gas venting tower includes a venting device, a water seal device, and a drainage device. Both sides of the water seal device are connected to gas pipelines. One gas pipeline is connected to the blast furnace gas inlet pipe of the blast furnace gas venting tower and is equipped with a pressure measuring device and a temperature measuring device. The other gas pipeline is connected to the venting device. A water supply pipeline and a drainage pipeline are connected to both sides of the water seal device, respectively. A water supply valve is installed on the water supply pipeline, and a drainage valve is installed on the drainage pipeline. The water seal device is connected to the drainage device through the drainage pipeline. A liquid level measuring device is installed outside the water seal device. This product is installed after each regulating valve of the blast furnace gas venting tower, enabling automatic interlocking control based on pipeline pressure requirements.

[0009] As a further aspect of the present invention: the pressure measuring device adopts a pressure transmitter, and the temperature measuring device adopts a temperature measuring resistance thermometer.

[0010] As a further aspect of the present invention, the pressure measuring device adopts a digital display remote pressure transmitter.

[0011] As a further aspect of the present invention, the drainage device adopts a drainer.

[0012] As a further aspect of the present invention: the liquid level measuring device adopts a diaphragm-sealed remote differential pressure transmitter.

[0013] As a further aspect of the present invention, both the water supply valve and the drain valve are pneumatic valves, which are convenient to use and easy to control by computer to open and close.

[0014] A method for using a control device for a blast furnace gas venting tower includes the following steps:

[0015] Automatic interlocking control of the drain valve: When the pressure is greater than the blast furnace gas pressure venting set value minus 1 kPa, the "permitted to open" green light on the drain valve illuminates. At this time, the drain valve is fully open, the valve turns green, and the drain valve is in a fully open draining state. When the liquid level measuring device displays "0" m, the water seal device is in a waterless state and does not function to seal the gas; the water seal device is fully open. Blast furnace gas can then be released smoothly through the water seal device. At this time, the drain valve is fully open, and the corresponding water supply valve automatically interlocks and closes regardless of the water level in the water seal device. The water supply valve turns red, and the "valve closed" indicator light turns red. At this time, the water supply valve is fully closed, and water supply stops. When the pressure is less than the blast furnace gas pressure release set value minus 2 kPa and the valve position of the regulating valve is less than 3%, the "allow valve to close" green light of the drain valve illuminates. At this time, the drain valve is controlled to close, the valve turns red, and the "valve closed" indicator light turns red. The drain valve is fully closed, and the corresponding water supply valve automatically interlocks and opens. The water supply valve turns green, and the "valve open" indicator light turns green. At this time, the water supply valve is fully open and supplying water.

[0016] The water supply valve is automatically interlocked. When the drain valve is fully closed and the water level in the water seal device is higher than 2m, the water supply valve automatically interlocks and closes completely, turning red and the "valve closed" indicator light turns red, stopping water supply. When the water level in the water seal device is lower than 1.6m, the water supply valve automatically interlocks and opens to supply water, turning green and the "valve open" indicator light turns green, stopping water supply. When the drain valve is fully open, the water supply valve will unconditionally close completely, stopping water supply, regardless of whether the water level in the water seal device is high or low.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention fully realizes the zero-leakage of gas by filling the water seal device with water when not releasing it and sealing the gas by the water level. When releasing the gas, the water seal device drains water in advance to ensure that the gas can be discharged smoothly. The entire control process does not require manual intervention and realizes fully automatic control, thereby saving gas. Attached Figure Description

[0019] Figure 1This is a schematic structural diagram of the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0020] Figure 2 This is an external schematic diagram of the control cabinet配套with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0021] Figure 3 This is an internal schematic diagram of the control cabinet配套with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the function control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0023] Figure 5 This is an overall schematic diagram of the drain valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0024] Figure 6 This is a first schematic diagram of the drain valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0025] Figure 7 This is a second schematic diagram of the drain valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0026] Figure 8 This is a third schematic diagram of the drain valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0027] Figure 9 This is a fourth schematic diagram of the drain valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0028] Figure 10 This is an overall schematic diagram of the makeup water valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0029] Figure 11 This is a first schematic diagram of the makeup water valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0030] Figure 12 This is a second schematic diagram of the makeup water valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0031] Figure 13 This is a third schematic diagram of the makeup water valve control program配合with the control device for the blast furnace gas relief tower in an embodiment of the present invention.

[0032] It should be noted that the words "配套" and "配合" in the original text seem to be used inaccurately. The more appropriate expressions might be "associated with" or "cooperating with". The above translation is adjusted accordingly.Among them: 1-Blast furnace gas inlet pipe, 2-Gas pipeline, 3-Pressure measuring device, 4-Temperature measuring device, 5-Ventilation device, 6-Water seal device, 7-Water supply valve, 8-Water supply pipeline, 9-Liquid level measuring device, 10-Drain valve, 11-Drain pipeline, 12-Drainage device. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The existing blast furnace gas venting tower has three DN800 vent pipes, each with a DN800 regulating valve. The total leakage of the three regulating butterfly valves is 3000 m³ / h, resulting in an annual economic loss of 3 million yuan. This invention installs a water seal device after each regulating valve in the blast furnace gas venting tower, automatically interlocking and controlling the system according to pipeline pressure requirements. The process control flow only shows the venting branch pipe of blast furnace #1; the venting branches of blast furnaces #2 and #3 are the same as those of blast furnace #1.

[0035] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0036] Example 1:

[0037] See Figure 1 A control device for a blast furnace gas venting tower includes a venting device 5, a water seal device 6, and a drainage device 12. Both sides of the water seal device 6 are connected to gas pipelines 2. One gas pipeline 2 is connected to the blast furnace gas inlet pipe 1 of the blast furnace gas venting tower, and a pressure measuring device 3 and a temperature measuring device 4 are installed on the gas pipeline 2. The other gas pipeline 2 is connected to the venting device 5. A water supply pipe 8 and a drainage pipe 11 are connected to both sides of the water seal device 6, respectively. A water supply valve 7 is installed on the water supply pipe 8, and a drainage valve 10 is installed on the drainage pipe 11. The water seal device 6 is connected to the drainage device 12 through the drainage pipe 11. A liquid level measuring device 9 is installed outside the water seal device 6. This product is installed after each regulating valve of the blast furnace gas venting tower, and can automatically achieve interlocked control according to the pipeline pressure requirements.

[0038] In one embodiment of the present invention, the pressure measuring device 3 is a pressure transmitter and the temperature measuring device 4 is a temperature measuring resistance thermometer, which can accurately measure the pressure and temperature of the gas pipeline.

[0039] In one embodiment of the present invention, the pressure measuring device adopts a digital display remote pressure transmitter, and the thermometer adopts a temperature measuring resistance thermometer, so that the specific values ​​of pressure and temperature can be obtained directly on the computer.

[0040] In one embodiment of the present invention, the drainage device 12 is a drainer, which is readily available on the market and simple and convenient to use.

[0041] In one embodiment of the present invention, the liquid level measuring device 9 adopts a diaphragm-sealed differential pressure transmitter.

[0042] In one embodiment of the present invention, both the water supply valve 7 and the drain valve 10 are electric valves, which are convenient to use and easy to control by computer to open and close.

[0043] A method for using a control device for a blast furnace gas venting tower includes the following steps:

[0044] Automatic interlocking control of the drain valve: When the pressure is greater than the blast furnace gas pressure venting set value minus 1 kPa, the "permitted to open" green light on the drain valve illuminates. At this time, the drain valve is fully open, the valve turns green, and the drain valve is in a fully open draining state. When the liquid level measuring device displays "0" m, the water seal device is in a waterless state and does not function to seal the gas; the water seal device is fully open. Blast furnace gas can then be released smoothly through the water seal device. At this time, the drain valve is fully open, and the corresponding water supply valve automatically interlocks and closes regardless of the water level in the water seal device. The water supply valve turns red, and the "valve closed" indicator light turns red. At this time, the water supply valve is fully closed, and water supply stops. When the pressure is less than the blast furnace gas pressure release set value minus 2 kPa and the valve position of the regulating valve is less than 3%, the "allow valve to close" green light of the drain valve illuminates. At this time, the drain valve is controlled to close, the valve turns red, and the "valve closed" indicator light turns red. The drain valve is fully closed, and the corresponding water supply valve automatically interlocks and opens. The water supply valve turns green, and the "valve open" indicator light turns green. At this time, the water supply valve is fully open and supplying water.

[0045] The water supply valve is automatically interlocked. When the drain valve is fully closed and the water level in the water seal device is higher than 2m, the water supply valve automatically interlocks and closes completely, turning red and the "valve closed" indicator light turns red, stopping water supply. When the water level in the water seal device is lower than 1.6m, the water supply valve automatically interlocks and opens to supply water, turning green and the "valve open" indicator light turns green, stopping water supply. When the drain valve is fully open, the water supply valve will unconditionally close completely, stopping water supply, regardless of whether the water level in the water seal device is high or low.

[0046] See Figures 2-3To better control this product, a Siemens S7-315 PLC control cabinet, Siemens modules, and network communication are used. The control cabinet software uses STEP 7 V5.6, and the host computer screen configuration software uses WinCC V7.5+SP2. By compiling the control program, the zero-leakage, fully automatic control of the blast furnace gas venting tower is achieved.

[0047] See Figure 4 The FC14 function control program for this product is as follows: 1. ma-computer screen manual / automatic control

[0048] 2. MO - Manual water supply valve start control / drain valve close control via computer screen;

[0049] 3. MC-computer screen manual water supply valve closing control / drain valve starting control;

[0050] 4. ao - Automatic control for water supply valve start / drain valve close;

[0051] 5. AC-Automatic control for water supply valve closing / drain valve starting;

[0052] 6. Out - Manual / automatic control of water supply and drainage valve output.

[0053] See Figure 5 The drain valve control program for this product (calling the FC14 function control program) is as follows:

[0054] 1. The drain valve of the M30.0-1# water seal device is manually / automatically controlled;

[0055] 2. The drain valve of the M30.2-1# water seal device is closed on the computer screen;

[0056] 3. The computer screen displays the opening of the drain valve for the M30.1-1# water seal device;

[0057] 4. I1.5 - Allow automatic closure of drain valve #1 in the venting tower;

[0058] 5. I1.4 - Automatic conditions for opening drain valves 1#-3# of the old venting tower;

[0059] 6. Q8.0-1# Water seal device drain valve open / close control output.

[0060] See Figures 6-9 The specific procedure for the drain valve control is as follows:

[0061] Program segment 1: Numerical comparator IN1 > IN2, and the output of M115.0 is the necessary condition for opening the drain valve of the water seal device (gas pressure value comparison); Note: IN1 = DB1.DBW44 is the actual measured pressure value of the blast furnace gas pipeline network, and IN2 = M236 is the numerical value of the blast furnace gas pressure set value - 1 kPa.

[0062] Program segment 2: Numerical comparator IN1 < IN2, and the output of M115.1 is the necessary condition for closing the drain valve of the water seal device (gas pressure value comparison); Note: IN1 = DB1.DBW44 is the actual measured pressure value of the blast furnace gas pipeline network, and IN2 = M238 is the numerical value of the gas pressure set value - 2 kPa.

[0063] Program segment 3: Numerical subtractor IN1 - IN2, M236 = the numerical value of the blast furnace gas pressure set value - 1 kPa; Note: IN1 = DB4.DBW4 is the gas pressure set value on the computer screen, and IN2 = 200 represents the actual numerical value 1 kPa in the program.

[0064] Program segment 4: Numerical subtractor IN1 - IN2, M238 = the numerical value of the blast furnace gas pressure set value - 2 kPa; Note: IN1 = DB4.DBW4 is the gas pressure set value on the computer screen, and IN2 = 400 represents the actual numerical value 2 kPa in the program.

[0065] Program segment 5: Numerical comparator IN1 < IN2, and M115.4 is the output when the blast furnace gas relief regulating valve position value is less than 3%; Note: IN1 = DB1.DBW26 is the valve position value of the gas relief regulating valve, and IN2 = 300 represents the numerical value of 3% of the gas relief regulating valve position in the program.

[0066] Program segment 6: Retention timer 2S, the input of M115.0 is the necessary condition for opening the drain valve of the water seal device (gas pressure value comparison), this signal is kept on for 2S (T60), and the output of the condition Q16.3 that allows the drain valve to open is enabled.

[0067] Program segment 7: Retention timer 2S, when the signals of M115.1 + M115.4 are simultaneously kept on for 2S (T61), the output of the condition Q16.4 that allows the drain valve to close is enabled. Note: M115.1 is the comparison condition for closing the drain valve of the water seal device, and M115.4 is the numerical value of the blast furnace gas relief regulating valve position less than 3%.

[0068] Refer to Figure 10 , the water replenishing valve control program of this product (calling the FC14 function control program) is as follows: 1. M36.0 - Manual / automatic control of the water replenishing valve of the 1# water seal device;

[0069] 2. The computer screen displays the opening of the water supply valve for the M36.1--1# water seal device;

[0070] 3. The water supply valve of the M36.2--1# water seal device is closed on the computer screen;

[0071] 4. M41.1 -- Automatic conditions that allow opening of the No. 1 water supply valve of the old venting tower;

[0072] 5. M41.0 -- Allows automatic closure of the No. 1 water supply valve of the old venting tower;

[0073] 6. Q8.3-1# Water seal device water supply valve open / close control output. Note: The water supply valve control procedures for water seal devices 2# and 3# are the same as those for water seal device 1#, but the addresses are different.

[0074] See Figures 11-13 The specific procedure for the water supply valve control is as follows:

[0075] Program segment 1:

[0076] 1. PIW320--1# Water seal device water level input;

[0077] 2.375--Upper limit of water level range for water seal device #1;

[0078] 3. Lower limit of water level range for water seal device #1 (0.000-1).

[0079] 4. MD300--1# Water seal device water level output.

[0080] Program segment 2:

[0081] Numerical comparator IN1≥IN2, high water level alarm condition for water seal device #1

[0082] 1. Input water level value for MD300--1# water seal device;

[0083] 2. DB10.DBD0--1# Water seal device high water level alarm computer screen setting value;

[0084] 3. M40.0--1# water seal device high water level alarm output;

[0085] 4. T1 - The input signal needs to be held for 2 seconds after it is turned on.

[0086] Program segment 3:

[0087] 1. High water level alarm signal for M40.0--1# water seal device;

[0088] 2. Signal indicating that the drain valve of the I0.0-1# water seal device is fully open;

[0089] 3. Control signal for drain valve of Q8.0-1# water seal device;

[0090] 4. M41.0-1# water supply valve stops water supply signal.

[0091] Program segment 4:

[0092] Numerical comparator IN1≥IN2, high water level alarm condition for water seal device #1

[0093] 1. Input water level value for MD300--1# water seal device;

[0094] 2. DB10.DBD12--1# Water seal device low water level alarm computer screen setting value;

[0095] 3. M40.1--1# water seal device low water level alarm output;

[0096] 4. T2 — The input signal needs to be held for 2 seconds after it is turned on.

[0097] Program segment 5:

[0098] 1. Low water level alarm signal for M40.1--1# water seal device;

[0099] 2. Signal indicating that the drain valve of the I0.1-1# water seal device is fully closed;

[0100] 3. Control signal for drain valve of Q8.0-1# water seal device;

[0101] 4. M41.1-1# water supply valve is authorized to supply water signal.

[0102] The blast furnace gas venting tower has three DN800 blast furnace gas regulating valves, with a total leakage of 3000 m³ / h. The resulting power generation benefit is calculated as follows: Leakage * Annual working hours / Power generation unit consumption * Excluding 8% self-consumption rate (0.92 represents 8% of the current power consumption rate for 100MW) * Electricity cost / (Tax rate 13%, excluding tax divided by 1.13) = (3000 * 24 * 362) / 3 * 0.92 * 0.425 / 1.13 = 3,006,000 yuan. This means that by using this product in conjunction with the above-mentioned functional control program, full-process automatic control can be achieved, resulting in energy savings from gas and an annual benefit of over 3 million yuan. This model can be adopted and promoted in related metallurgical industries.

[0103] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A control device for a blast furnace gas venting tower, characterized in that, The device includes a venting device, a water seal device, and a drainage device. Both sides of the water seal device are connected to gas pipelines. One side of the gas pipeline is connected to the blast furnace gas inlet pipe of the blast furnace gas venting tower and is equipped with a pressure measuring device and a temperature measuring device. The other side of the gas pipeline is connected to the venting device. The two sides of the water seal device are respectively connected to a water supply pipeline and a drainage pipeline. A water supply valve is installed on the water supply pipeline, and a drainage valve is installed on the drainage pipeline. The water seal device is connected to the drainage device through the drainage pipeline. A liquid level measuring device is installed on the outside of the water seal device.

2. The control device for the blast furnace gas venting tower according to claim 1, characterized in that, The pressure measuring device uses a pressure transmitter.

3. The control device for the blast furnace gas venting tower according to claim 2, characterized in that, The pressure measuring device uses a digital display remote pressure transmitter.

4. The control device for the blast furnace gas venting tower according to claim 1, characterized in that, The drainage device is a drainer.

5. The control device for the blast furnace gas venting tower according to claim 1 or 4, characterized in that, The liquid level measuring device uses a diaphragm-sealed remote differential pressure transmitter.

6. The control device for the blast furnace gas venting tower according to claim 1 or 4, characterized in that, Both the water supply valve and the drain valve are pneumatic valves.

7. A method of using a control device for a blast furnace gas venting tower, characterized in that, Includes the following steps: Automatic interlocking control of the drain valve: When the pressure is greater than the blast furnace gas pressure venting set value minus 1 kPa, the "allow opening" green light on the drain valve illuminates. At this time, the drain valve is fully open, the valve turns green, and the drain valve is in a fully open draining state. When the liquid level measuring device displays "0" m, the water seal device is in a waterless state and the water seal device is fully open. Blast furnace gas can then be released smoothly through the water seal device. At this time, the drain valve is fully open, and the corresponding water supply valve automatically interlocks and closes regardless of the water level in the water seal device. The water supply valve turns red, and the "valve closed" indicator light turns red. At this time, the water supply valve is fully closed, and water supply stops. When the pressure is less than the blast furnace gas pressure release set value minus 2 kPa and the valve position of the regulating valve is less than 3%, the "allowed to close" green light of the drain valve illuminates. At this time, the drain valve is controlled to close, the valve turns red, and the "valve closed" indicator light turns red. The drain valve is fully closed, and the corresponding water supply valve automatically interlocks and opens. The water supply valve turns green, and the "valve open" indicator light turns green. At this time, the water supply valve is fully open and supplying water. The water supply valve is automatically interlocked. When the drain valve is fully closed and the water level in the water seal device is higher than 2m, the water supply valve automatically interlocks and closes completely, turning red. The "valve closed" indicator light also turns red, indicating that water supply has stopped. When the water level in the water seal device is lower than 1.6m, the water supply valve automatically interlocks and opens to supply water, turning green. The "valve open" indicator light also turns green, indicating that water supply has started. When the drain valve is fully open, the water supply valve remains fully closed regardless of whether the water level in the water seal device is high or low, indicating that water supply has stopped.

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