System and method for stabilizing calorific value and pressure of mixed gas by using waste nitrogen

Abstract

The invention belongs to the technical field of metallurgical gas control, and particularly discloses a system and method for stabilizing the calorific value and pressure of mixed gas by using waste nitrogen, and the method comprises the following steps: S1, setting a coke oven gas pressure threshold value, and detecting the coke oven gas pressure value; s2, judging whether the coke oven gas pressure reaches a coke oven gas pressure threshold value or not, and controlling the introduction amount of natural gas according to a judgment result; s3, setting a threshold value of a target gas calorific value, and carrying out proportioning calculation to obtain a gas calorific value after the first mixing; s4, according to the detected calorific value of the coal gas, flow compensation calculation is conducted, and the amount of waste nitrogen needing to be added is obtained; s5, the required waste nitrogen amount is introduced, and the calorific value of the coal gas mixed for the second time is obtained through proportion calculation; s6, judging whether the calorific value of the mixed coal gas reaches a target coal gas calorific value or not; and S7, the threshold value of the target gas pressure value is 11-14 kPa, the mixed gas reaching the target gas heat value enters a booster fan, and whether the gas pressure value of the mixed gas reaches the threshold value of the target gas pressure value or not is detected.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical gas control, and in particular to a system and method for stabilizing the calorific value and pressure of mixed gas by utilizing polluted nitrogen. Background Art

[0002] In the iron and steel metallurgical industry, the stable operation of the mixed gas system is crucial to energy efficiency and production safety. For energy efficiency, a stable mixed gas system can ensure that different types of gas are mixed and blended in the best proportion, and can also ensure that the combustion equipment is in a good combustion state, improve combustion efficiency, reduce the generation of incomplete combustion products, and reduce energy losses. At the same time, it helps the waste heat recovery system to operate efficiently, using the waste heat after gas combustion to generate steam or hot water for power generation, heating, etc.; in terms of production safety, the stable operation of the mixed gas system can reduce the risk of gas leakage, through stable pressure and flow control, reduce the leakage points of pipelines and equipment, ensure the safe transportation of gas in a closed system, effectively control the gas concentration and oxygen content within a safe range, and avoid the occurrence of explosion accidents. In addition, the stable gas supply reduces the impact and damage to production equipment, avoids frequent start-up and shutdown or overload operation of equipment, extends the service life of equipment, reduces maintenance costs, and ensures safe and reliable operation of equipment.

[0003] However, the existing technology has the problem that it is difficult to accurately control the mixing ratio of different gases during actual production and operation, and the calorific value and pressure fluctuations of gas from different sources are large. Summary of the invention

[0004] The purpose of the present invention is to provide a system and method for stabilizing the calorific value and pressure of mixed coal gas using contaminated nitrogen, so as to solve the problem that it is difficult to accurately control the mixing ratio of different gases and the calorific value and pressure fluctuations of coal gas from different sources are large during actual production operation.

[0005] To achieve the above-mentioned purpose, the basic scheme provided by the present invention is: a system for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen, comprising a blast furnace gas pipe, a coke oven gas pipe, a polluted nitrogen pipe, an industrial nitrogen pipe, a natural gas pipe, a mixing main pipe, a gas pipe network, a PID controller and a PLC controller, the coke oven gas pipe is connected to the blast furnace gas pipe, the polluted nitrogen pipe is connected to the blast furnace gas pipe, the industrial nitrogen pipe is connected to the polluted nitrogen pipe, the natural gas pipe is connected to the coke oven gas pipe, the blast furnace gas pipe is connected to the mixing main pipe, the mixing main pipe is connected to the gas pipe network, a blast furnace gas regulating valve and a blast furnace gas calorific value meter are provided on the blast furnace gas pipe, a coke oven gas pressure gauge is provided on the coke oven gas pipe, a polluted nitrogen regulating valve is provided on the polluted nitrogen pipe, an industrial nitrogen regulating valve is provided on the industrial nitrogen pipe, a natural gas regulating valve is provided on the natural gas pipe, a mixing pressure gauge and a mixed calorific value meter are provided on the mixing main pipe, and a pressurizing fan and a pressurized pressure gauge are provided on the mixing main pipe.

[0006] The principle and beneficial effect of the present invention are as follows: when blast furnace gas is mixed with coke oven gas and natural gas, the calorific value of the gas becomes higher, causing unstable gas pressure. The blast furnace gas pipe is connected to the dirty nitrogen pipe. When the pipe network system is unstable, the dirty nitrogen regulating valve is adjusted to control the content of the added dirty nitrogen, thereby achieving the effect of stabilizing the high calorific value of the converted gas. The dirty nitrogen resources can be well utilized, the generation of abnormal conditions in the mixing system can be effectively solved, and the high calorific value caused by the mixing of coke oven gas and natural gas can be reduced.

[0007] Option 2: This is the preferred basic option. The blast furnace gas regulating valve, waste nitrogen regulating valve, industrial nitrogen regulating valve, and natural gas regulating valve are all electrically connected to the PID controller. The blast furnace gas calorific value meter, coke oven gas pressure gauge, mixed pressure gauge, mixed calorific value meter, pressurized fan, and pressurized pressure gauge are all electrically connected to the PLC controller. The PID controller is signal-connected to the PLC controller.

[0008] Scheme 3, a method for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen, comprising the following steps:

[0009] S1: Set the coke oven gas pressure threshold through the PLC controller and use the coke oven gas pressure gauge to detect the coke oven gas pressure value;

[0010] S2: judging whether the coke oven gas pressure reaches the coke oven gas pressure threshold, and controlling the amount of natural gas introduced according to the judgment result;

[0011] S3: Set the threshold of the target gas calorific value through the PLC controller, pass the high calorific value gas into the blast furnace gas pipe, and perform the ratio calculation to obtain the calorific value of the gas after the first mixing;

[0012] S4: Based on the calorific value of the coal gas detected for the first time, flow compensation calculation is performed in the PLC controller to obtain the amount of polluted nitrogen gas required to be added;

[0013] S5: using the PLC controller to transmit a signal to the PID controller, the PID controller opens the dirty nitrogen regulating valve, introduces the required amount of dirty nitrogen into the blast furnace gas pipe, and obtains the calorific value of the gas after the second mixing through ratio calculation;

[0014] S6: Determine whether the calorific value of the gas after the second mixing reaches the target calorific value of the gas. If it reaches the target calorific value, the gas directly enters the mixing main pipe. If it does not reach the target calorific value, the flow compensation calculation is performed in the PLC controller to obtain the required amount of industrial nitrogen to be introduced, and the industrial nitrogen regulating valve is opened through the PID controller to introduce the required amount of industrial nitrogen into the blast furnace gas pipe. The mixed gas enters the mixing main pipe;

[0015] S7: The threshold of the target gas pressure value is set to 11-14kPa through the PLC controller. The mixed gas that reaches the target gas calorific value enters the pressurized fan. The pressure gauge after pressurization is used to detect whether the gas pressure value of the mixed gas reaches the threshold range of the target gas pressure value. If it reaches the threshold range, it enters the gas network. If not, the pressurized fan is controlled to increase the pressure, and it enters the gas network after reaching the threshold.

[0016] Scheme 4 is a preferred embodiment of Scheme 3. The basis for controlling the amount of natural gas introduced in step S2 is to see whether the coke oven gas pressure reaches the threshold standard:

[0017] If the threshold is reached, the opening of the natural gas regulating valve will not be changed;

[0018] If it is less than the threshold, the opening of the natural gas regulating valve is increased to increase the natural gas flow entering the coke oven gas pipe;

[0019] If it is greater than the threshold, the opening of the natural gas regulating valve will be reduced to reduce the natural gas flow entering the coke oven gas pipe.

[0020] Option 5 is a preferred option of Option 3. The high calorific value fuel gas in step S3 is natural gas and coke oven gas.

[0021] Scheme 6: This is the preferred option of Scheme 5. The formula for calculating the ratio is:

[0022] R3=[Q1·R1+(Q2-Q1)·R2] / (Q1+Q2)

[0023] In step S3, R1 is the calorific value of blast furnace gas, R2 is the calorific value of high calorific value gas, R3 is the target calorific value, Q1 is the blast furnace gas flow rate, and Q2 is the high calorific value gas flow rate;

[0024] In step S5, R1 is the high gas calorific value, R2 is the dirty nitrogen gas calorific value, R3 is the target calorific value, Q1 is the high gas flow rate, and Q2 is the dirty nitrogen gas flow rate.

[0025] Scheme 7: This is the preferred basic scheme. The flow compensation calculation formula is:

[0026] Q=K*[ΔP / ρ]1 / 2

[0027] Among them, ΔP is the differential pressure, ρ is the gas density, and K1 is the maximum flow rate which is proportional to the square root of the maximum differential pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a system and method for stabilizing the calorific value and pressure of mixed coal gas by utilizing polluted nitrogen in the present invention; DETAILED DESCRIPTION

[0029] The present invention is further described in detail below through specific embodiments:

[0030] The figure marks in the drawings of the specification include: 1. blast furnace gas pipe, 2. coke oven gas pipe, 3. dirty nitrogen pipe, 4. industrial nitrogen pipe, 5. natural gas pipe, 6. mixing main pipe, 7. gas pipeline network, 8. blast furnace gas regulating valve, 9. blast furnace gas calorific value meter, 10. coke oven gas pressure gauge, 11. dirty nitrogen regulating valve, 12. industrial nitrogen regulating valve, 13. natural gas regulating valve, 14. mixing pressure gauge, 15. mixed calorific value meter, 16. pressurized fan, 17. pressure gauge after pressurization, 18. PID controller, 19. PLC controller.

[0031] Embodiment 1

[0032] Implementation example Figure 1 As shown: a system for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen, comprising a blast furnace gas pipe 1, a coke oven gas pipe 2, a polluted nitrogen pipe 3, an industrial nitrogen pipe 4, a natural gas pipe 5, a mixing main pipe 6, a gas pipe network 7, a PID controller 18 and a PLC controller 19, the coke oven gas pipe 2 is connected to the blast furnace gas pipe 1, the polluted nitrogen pipe 3 is connected to the blast furnace gas pipe 1, the industrial nitrogen pipe 4 is connected to the polluted nitrogen pipe 3, the natural gas pipe 5 is connected to the coke oven gas pipe 2, the blast furnace gas pipe 1 is connected to the mixing main pipe 6, the mixing main pipe 6 is connected to the gas pipe network 7, a blast furnace gas regulating valve 8 and a blast furnace gas calorific value meter 9 are provided on the blast furnace gas pipe 1, a coke oven gas pressure gauge 10 is provided on the coke oven gas pipe 2, and a polluted nitrogen pipe 11 is connected to the mixing main pipe 6. 3 is provided with a dirty nitrogen regulating valve 11, the industrial nitrogen pipe 4 is provided with an industrial nitrogen regulating valve 12, the natural gas pipe 5 is provided with a natural gas regulating valve 13, the mixing main pipe 6 is provided with a mixing pressure gauge 14 and a mixing calorific value meter 15, the mixing main pipe 6 is provided with a pressurizing fan 16 and a pressurized pressure gauge 17, the blast furnace gas regulating valve 8, the dirty nitrogen regulating valve 11, the industrial nitrogen regulating valve 12, and the natural gas regulating valve 13 are all electrically connected to the PID controller 18, the blast furnace gas calorific value meter 9, the coke oven gas pressure gauge 10, the mixing pressure gauge 14, the mixing calorific value meter 15, the pressurizing fan 16 and the pressurized pressure gauge 17 are all electrically connected to the PLC controller 19, and the PID controller 18 is signal-connected to the PLC controller 19.

[0033] The specific implementation of this embodiment is as follows:

[0034] After the coke oven gas and natural gas are mixed, high calorific value gas is formed. The high calorific value gas enters the blast furnace gas pipe 1 and mixes with the blast furnace gas. Then, the dirty nitrogen regulating valve 11 is opened to pass the dirty nitrogen into the blast furnace gas pipe 1 to stabilize the calorific value of the gas. If the calorific value of the gas has not reached the target threshold after the dirty nitrogen is passed, the industrial nitrogen regulating valve 12 is opened to add industrial nitrogen into the blast furnace gas pipe 1 to reduce the heat again and stabilize the calorific value. The calorific value and pressure value of the mixed gas are detected by the mixed calorific value meter 15 and the mixed pressure gauge 14. If the calorific value and pressure value of the mixed gas both reach the target threshold, the mixed gas enters the pressurizing fan 16 for pressurization. The pressurized mixed gas enters the gas pipeline network 7. If the calorific value and pressure value of the mixed gas do not reach the target threshold, dirty nitrogen or high calorific value gas is passed again for mixing, and the mixed gas enters the gas pipeline network 7 after reaching the target threshold.

[0035] Embodiment 2

[0036] Implementation example Figure 1 A method for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen is characterized by comprising the following steps:

[0037] S1: setting the coke oven gas pressure threshold value through the PLC controller 19, and detecting the coke oven gas pressure value using the coke oven gas pressure gauge 10;

[0038] S2: Determine whether the coke oven gas pressure reaches the coke oven gas pressure threshold, and control the amount of natural gas introduced based on the determination result. The basis for controlling the amount of natural gas introduced is to see whether the coke oven gas pressure reaches the threshold standard:

[0039] If the threshold is reached, the opening of the natural gas regulating valve 13 is not changed;

[0040] If it is less than the threshold, the opening of the natural gas regulating valve 13 is increased to increase the flow of natural gas entering the coke oven gas pipe 2;

[0041] If it is greater than the threshold, the opening of the natural gas regulating valve 13 is reduced to reduce the flow of natural gas entering the coke oven gas pipe 2;

[0042] S3: The threshold of the target gas calorific value is set by the PLC controller 19, and the high calorific value gas is introduced into the blast furnace gas pipe 1, and the ratio calculation is performed to obtain the calorific value of the gas after the first mixing. The high calorific value gas is natural gas and coke oven gas, and the ratio calculation is:

[0043] R3=[Q1·R1+(Q2-Q1)·R2] / (Q1+Q2)

[0044] Among them, R1 is the calorific value of blast furnace gas, R2 is the calorific value of high calorific value gas, R3 is the target calorific value, Q1 is the blast furnace gas flow rate, Q2 is the high calorific value gas flow rate;

[0045] S4: Based on the calorific value of the coal gas detected for the first time, a flow compensation calculation is performed in the PLC controller 19 to obtain the amount of dirty nitrogen gas that needs to be added;

[0046] S5: The PLC controller 19 transmits a signal to the PID controller 18, and the PID controller 18 opens the dirty nitrogen regulating valve 11, introduces the required amount of dirty nitrogen into the blast furnace gas pipe 1, and obtains the calorific value of the gas after the second mixing through ratio calculation. The ratio calculation is:

[0047] R3=[Q1·R1+(Q2-Q1)·R2] / (Q1+Q2)

[0048] Among them, R1 is the high gas calorific value, R2 is the dirty nitrogen gas calorific value, R3 is the target calorific value, Q1 is the high gas flow rate, and Q2 is the dirty nitrogen gas flow rate;

[0049] S6: Determine whether the calorific value of the gas after the second mixing reaches the target calorific value of the gas. If it reaches the target calorific value, the gas directly enters the mixing main pipe 6. If it does not reach the target calorific value, the flow compensation calculation is performed in the PLC controller 19 to obtain the required amount of industrial nitrogen to be introduced, and the industrial nitrogen regulating valve 12 is opened through the PID controller 18 to introduce the required amount of industrial nitrogen into the blast furnace gas pipe 1. The mixed gas enters the mixing main pipe 6;

[0050] S7: The threshold of the target gas pressure value is set to 11-14 kPa through the PLC controller 19, and the mixed gas reaching the target gas calorific value enters the pressurizing fan 16. The pressurized pressure gauge 17 is used to detect whether the gas pressure value of the mixed gas reaches the threshold range of the target gas pressure value. If it reaches the threshold range, it enters the gas pipe network 7. If not, the pressurizing fan 16 is controlled to increase the pressure, and the mixed gas enters the gas pipe network 7 after reaching the threshold.

[0051] The above flow compensation calculation formula is:

[0052] Q=K*[ΔP / ρ]1 / 2

[0053] Among them, ΔP is the differential pressure, ρ is the gas density, and K is the maximum flow rate which is proportional to the square root of the maximum differential pressure.

[0054] The specific implementation of this embodiment is as follows:

[0055] When the high calorific value gas enters the blast furnace gas pipe 1, the calorific value of the high gas is measured to be 800 kCal / m 3 , the maximum air flow is 20000m 3 / h, according to the overall operation of the blast furnace, the target calorific value is set to 600kCal / m through the PLC controller 19. 3 When the PLC controller 19 receives the heat value and flow rate signal transmitted back by the detection instrument, according to the formula:

[0056] R3=[Q1·R1+(Q2-Q1)·R2] / (Q1+Q2) to calculate the amount of polluted nitrogen required to be introduced.

[0057] Substitute the test value into the formula:

[0058] 600=[20000*800+(Q2-20000)*0] / (20000+Q2)

[0059] It turns out that Q2≈6667m 3 / h

[0060] At this time, the flow rate of polluted nitrogen gas required to be introduced is 6667m 3 / h, after the PLC controller 19 calculates the result, it sends a signal to the PID controller 18. After receiving the signal, the PID controller 18 controls the dirty nitrogen regulating valve 11 to open. When the dirty nitrogen gas intake reaches 6667m 3 / h, the PID controller 18 controls the dirty nitrogen regulating valve 11 to close, and then further detects the high gas mixed with dirty nitrogen. If it reaches 600kCal / m 3 The target calorific value is reached, and then the gas enters the pressurizing fan 16 for pressurization and is transported to the gas network 7. If the target calorific value is not reached, 600 kCal / m 3 The target calorific value is then received by the PLC controller 19, and the required supplementary nitrogen is calculated. Then the PLC controller 19 sends a signal to the PID controller 18. After receiving the signal, the PID controller 18 controls the industrial nitrogen regulating valve 12 to open. After the target calorific value is reached, the PID controller 18 controls the industrial nitrogen regulating valve 12 to close. Then the mixed coal gas enters the pressurizing fan 16 for pressurization and is transported to the gas pipeline network 7.

[0061] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A system for stabilizing the calorific value and pressure of mixed coal gas using polluted nitrogen, characterized in that: The invention comprises a blast furnace gas pipe (1), a coke oven gas pipe (2), a dirty nitrogen pipe (3), an industrial nitrogen pipe (4), a natural gas pipe (5), a mixing main pipe (6), a gas pipe network (7), a PID controller (18) and a PLC controller (19), wherein the coke oven gas pipe (2) is connected to the blast furnace gas pipe (1), the dirty nitrogen pipe (3) is connected to the blast furnace gas pipe (1), the industrial nitrogen pipe (4) is connected to the dirty nitrogen pipe (3), the natural gas pipe (5) is connected to the coke oven gas pipe (2), the blast furnace gas pipe (1) is connected to the mixing main pipe (6), and the mixing main pipe (6) is connected to the gas pipe network (7). The two pipes are connected to a pipe network (7), the blast furnace gas pipe (1) is provided with a blast furnace gas regulating valve (8) and a blast furnace gas calorific value meter (9), the coke oven gas pipe (2) is provided with a coke oven gas pressure gauge (10), the dirty nitrogen pipe (3) is provided with a dirty nitrogen regulating valve (11), the industrial nitrogen pipe (4) is provided with an industrial nitrogen regulating valve (12), the natural gas pipe (5) is provided with a natural gas regulating valve (13), the mixing main pipe (6) is provided with a mixing pressure gauge (14) and a mixing calorific value meter (15), and the mixing main pipe (6) is provided with a pressurizing fan (16) and a pressure gauge after pressurization (17).

2. A system for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen according to claim 1, characterized in that: The blast furnace gas regulating valve (8), the waste nitrogen regulating valve (11), the industrial nitrogen regulating valve (12), and the natural gas regulating valve (13) are all electrically connected to the PID controller (18); the blast furnace gas calorific value meter (9), the coke oven gas pressure gauge (10), the mixed pressure gauge (14), the mixed calorific value meter (15), the pressurized fan (16), and the pressurized pressure gauge (17) are all electrically connected to the PLC controller (19); and the PID controller (18) is signal-connected to the PLC controller (19).

3. A method for stabilizing the calorific value and pressure of mixed coal gas using polluted nitrogen, characterized in that: The following steps are involved: S1: setting a coke oven gas pressure threshold value through a PLC controller (19) and detecting a coke oven gas pressure value using a coke oven gas pressure gauge (10); S2: judging whether the coke oven gas pressure reaches the coke oven gas pressure threshold, and controlling the amount of natural gas introduced according to the judgment result; S3: setting a threshold value of the target gas calorific value through the PLC controller (19), passing the high calorific value gas into the blast furnace gas pipe (1), and performing a ratio calculation to obtain the calorific value of the gas after the first mixing; S4: Based on the calorific value of the coal gas detected for the first time, a flow compensation calculation is performed in the PLC controller (19) to obtain the amount of polluted nitrogen gas required to be added; S5: using the PLC controller (19) to transmit a signal to the PID controller (18), the PID controller (18) opens the dirty nitrogen regulating valve (11), introduces the required amount of dirty nitrogen into the blast furnace gas pipe (1), and obtains the calorific value of the gas after the second mixing through ratio calculation; S6: Determine whether the calorific value of the gas after the second mixing reaches the target calorific value of the gas. If it reaches the target calorific value, the gas directly enters the mixing main pipe (6). If it does not reach the target calorific value, the flow compensation calculation is performed in the PLC controller (19) to obtain the required amount of industrial nitrogen to be introduced, and the industrial nitrogen regulating valve (12) is opened through the PID controller (18) to introduce the required amount of industrial nitrogen into the blast furnace gas pipe (1). The mixed gas enters the mixing main pipe (6); S7: The threshold of the target gas pressure value is set to 11-14 kPa through the PLC controller (19), and the mixed gas that reaches the target gas calorific value enters the pressurizing fan (16). The pressure gauge (17) after pressurization is used to detect whether the gas pressure value of the mixed gas reaches the threshold range of the target gas pressure value. If it reaches the threshold range, it enters the gas pipeline (7). If it does not reach the threshold, the pressurizing fan (16) is controlled to increase the pressure, and the mixed gas enters the gas pipeline (7) after reaching the threshold.

4. The method for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen according to claim 3, characterized in that: The basis for controlling the amount of natural gas introduced in step S2 is to see whether the coke oven gas pressure reaches the threshold standard: If the threshold is reached, the opening of the natural gas regulating valve (13) is not changed; If it is less than the threshold value, the opening of the natural gas regulating valve (13) is increased to increase the flow of natural gas entering the coke oven gas pipe (2); If it is greater than the threshold value, the opening of the natural gas regulating valve (13) is reduced to reduce the flow of natural gas entering the coke oven gas pipe (2).

5. The method for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen according to claim 3, characterized in that: The high calorific value fuel gas in step S3 is natural gas and coke oven gas.

6. A system and method for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen according to claim 5, characterized in that: The formula for calculating the ratio is: R3=[Q1·R1+(Q2-Q1)·R2] / (Q1+Q2) In step S3, R1 is the calorific value of blast furnace gas, R2 is the calorific value of high calorific value gas, R3 is the target calorific value, Q1 is the blast furnace gas flow rate, and Q2 is the high calorific value gas flow rate; In step S5, R1 is the high gas calorific value, R2 is the dirty nitrogen gas calorific value, R3 is the target calorific value, Q1 is the high gas flow rate, and Q2 is the dirty nitrogen gas flow rate.

7. The method for stabilizing the calorific value and pressure of mixed coal gas by using polluted nitrogen according to claim 3, characterized in that: The flow compensation calculation formula is: Q=K*[ΔP / ρ]1 / 2 Among them, ΔP is the differential pressure, ρ is the gas density, and K1 is the maximum flow rate which is proportional to the square root of the maximum differential pressure.

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