Hydrogen-rich carbon circulating oxygen blast furnace tuyere oxygen supply quantity matching device based on audio frequency measurement and adjusting method

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a hydrogen-rich carbon circulating oxygen blast furnace tuyere oxygen supply matching device based on audio frequency measurement and an adjusting method.The device comprises a blast furnace body, an optical transmitter, an optical receiver and a central control room host, the blast furnace body is communicated with a tuyere small sleeve, and the tuyere small sleeve is provided with a hot gas pipe and an oxygen pipe; the oxygen pipe is provided with an electromagnetic flowmeter and an electric control adjusting valve, a hot gas pipe flange is connected with a hot gas branch pipe, a condenser microphone is arranged at the flange connecting position, the condenser microphone and the electromagnetic flowmeter are electrically connected with a light transmitter, the light transmitter is electrically connected with a light receiver, and the light receiver is electrically connected with a PLC. And the central control room host and the electric control adjusting valve are electrically connected with the PLC. The problem that the oxygen supply amount corresponding to the hot gas injection amount of the tuyere small sleeve cannot be accurately controlled is solved. According to the invention, the audio signal of the hot gas is monitored through the condenser microphone, and the oxygen supply amount corresponding to the hot gas is obtained by combining the calculation of the central control room host, so that the oxygen supply amount is accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace ironmaking, and in particular to a device and an adjustment method for matching the oxygen supply amount of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement. Background Art

[0002] Blast furnace ironmaking is a steelmaking process that involves mixing iron-containing raw materials (such as iron ore, sintered ore, and pellets) with fuels (such as coke and pulverized coal) and auxiliary raw materials in a specific proportion. The mixture is then pumped into the blast furnace through tuyeres along the furnace's circumference, causing the raw materials to undergo a chemical reaction at high temperatures, producing liquid pig iron. To improve blast furnace ironmaking efficiency and reduce carbon emissions, the hydrogen-rich carbon-cycle oxygen blast furnace significantly reduces carbon emissions by integrating top gas decarbonization (hot gas) and full oxygen smelting, building on the traditional blast furnace process.

[0003] However, during the production process, there will be deviations in the oxygen supply corresponding to the hot gas injection volume of the tuyere small sleeve. This deviation directly affects the efficiency and energy consumption of the reduction reaction in the furnace. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydrogen-rich carbon cycle oxygen blast furnace tuyere oxygen supply matching device and adjustment method based on audio frequency measurement, so as to solve the problem that the oxygen supply corresponding to the hot coal gas injection volume of the tuyere small sleeve will deviate, resulting in low reduction reaction efficiency and high energy consumption in the furnace.

[0005] To achieve the above-mentioned objectives, the basic solution provided by the present invention is: a hydrogen-rich carbon cycle oxygen blast furnace tuyere oxygen supply matching device and adjustment method based on audio frequency measurement, comprising a blast furnace body, an optical transmitter, an optical receiver and a central control room host, the air inlet end of the blast furnace body being connected to a tuyere small sleeve, the tuyere small sleeve being respectively connected to a hot gas pipe and an oxygen pipe, the oxygen pipe being provided with an electromagnetic flowmeter and an electrically controlled regulating valve, one end of the hot gas pipe being flange-connected to a hot gas branch pipe, the flange connection between the hot gas pipe and the hot gas branch pipe being detachably connected to an L-shaped flat iron, the L-shaped flat iron being detachably connected to a condenser microphone, the condenser microphone and the electromagnetic flowmeter being electrically connected to the optical transmitter, the optical transmitter being electrically connected to the optical receiver, the optical receiver being electrically connected to a PLC controller, the central control room host being electrically connected to the PLC controller, and the electrically controlled regulating valve being electrically connected to the PLC controller.

[0006] The working principle of the present invention is as follows: first, hot coal gas enters the blast furnace body through the hot coal gas branch pipe, the hot coal gas pipe, and the tuyere sleeve. Simultaneously, oxygen enters the blast furnace body through the oxygen pipe and the tuyere sleeve. During this process, a capacitive microphone converts the sound frequency generated by the hot coal gas in the hot coal gas pipe into an electrical signal in real time. The electrical signal is transmitted to an optical transmitter for conversion into an optical signal. The optical signal is then transmitted to an optical receiver for conversion into an electrical signal. The electrical signal is then transmitted to a main unit in the central control room via a PLC controller. After receiving the electrical signal of the hot coal gas sound frequency, the main unit in the central control room calculates the theoretical oxygen supply of a single tuyere sleeve, then compares the theoretical oxygen supply of the tuyere sleeve with the actual oxygen supply of the tuyere sleeve to calculate a deviation. Then, based on the calculated deviation, the main unit in the central control room issues a command to the PLC controller to adjust the opening of an electronically controlled regulating valve on the oxygen pipe. The PLC controller increases or decreases the opening of the electronically controlled regulating valve according to the deviation value to ensure that the actual oxygen supply of the tuyere sleeve is the same as the theoretical oxygen supply of the tuyere sleeve.

[0007] The beneficial effects of the present invention are as follows: the audio signal of the hot gas is monitored by a capacitive microphone, and the audio signal is combined with the calculation of the main unit in the central control room to determine the oxygen supply corresponding to the hot gas, so that the electronically controlled regulating valve on the oxygen pipe is adjusted by the PLC controller to achieve precise control of the oxygen supply. During this process, the audio signal is transmitted through an optical transmitter-optical receiver link, avoiding the signal attenuation and distortion problems of traditional cables.

[0008] Option 2 is a preferred option of the basic option. A protective box is provided on the L-shaped flat iron, and the condenser microphone is located in the protective box. A switch door is detachably connected to one side of the protective box. By setting up the protective box, the condenser microphone can be protected and external noise can be prevented from interfering with the condenser microphone.

[0009] Solution 3, a method for adjusting the oxygen supply amount of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement, comprising the following steps:

[0010] S1. First, hot gas enters the blast furnace through the hot gas branch pipe, hot gas pipe and tuyere sleeve. At the same time, oxygen enters the blast furnace through the oxygen pipe and tuyere sleeve.

[0011] S2, the condenser microphone converts the sound frequency generated by the hot gas in the hot gas pipe into an electrical signal, which is then transmitted to the optical transmitter and converted into an optical signal. The optical signal is then transmitted to the optical receiver and converted into an electrical signal. The electrical signal is then transmitted to the main unit in the central control room via the PLC controller;

[0012] S3. After receiving the electrical signal of the hot gas sound frequency, the host computer in the central control room calculates the hot gas sound frequency;

[0013] S4. Calculate theoretical hot gas flow velocity based on the audio frequency;

[0014] S5. Calculate the theoretical hot gas injection volume of a single tuyere small set based on the theoretical hot gas flow velocity;

[0015] S6. Calculate the proportion of the theoretical hot gas injection volume of a single tuyere small set in the total injected gas volume based on the theoretical hot gas injection volume of a single tuyere small set;

[0016] S7. Calculate the theoretical oxygen supply capacity of a single tuyere small set based on the proportion of the theoretical hot gas injection capacity of a single tuyere small set in the total injected gas capacity;

[0017] S8. Compare the theoretical oxygen supply of the tuyere small sleeve with the actual oxygen supply of the tuyere small sleeve, and calculate the deviation value;

[0018] S9. After calculating the deviation value, the main unit in the central control room adjusts the opening of the electric control valve on the oxygen pipe through the PLC controller to make the actual oxygen supply of the tuyere sleeve the same as the theoretical oxygen supply of the tuyere sleeve; the audio signal in the hot gas pipe is collected through a capacitive microphone, and the theoretical oxygen supply is calculated based on the formula. The opening is dynamically adjusted through the electric control valve to achieve a precise match between the oxygen supply and the hot gas volume, ensuring the maximum efficiency of the reduction reaction in the furnace.

[0019] Solution 4 is a preferred solution of Solution 3. In S3, the calculation formula of the audio frequency is as follows:

[0020]

[0021] Where: f is the sound frequency of hot gas; K max is the peak value of audio detection; N is the number of audio sampling points; f s is the audio sampling frequency.

[0022] Option 5 is a preferred option of Option 3. In S4, the theoretical hot coal gas flow rate is calculated as follows:

[0023]

[0024] Where: U 理论 is the theoretical hot gas flow velocity; f is the hot gas sound frequency; S t is the Strouhal number, S t =0.2; D is the diameter of the hot gas pipe; C O is the reference speed of sound in air, C O =343m / s; C 热煤气 is the speed of sound of hot gas.

[0025] Scheme 6, which is the preferred option of Scheme 3, in S5, the calculation formula for the theoretical hot gas injection rate of a single tuyere small sleeve is as follows:

[0026] Q1=U 理论 ·nS

[0027] Where: U 理论 is the theoretical hot gas flow rate; Q1 is the theoretical hot gas injection volume of a single tuyere sleeve; S is the cross-sectional area of the tuyere sleeve; n is the number of tuyere sleeves, n=1.

[0028] Option 7, which is the preferred option of Option 3, in S6, the calculation formula for the proportion of the theoretical hot gas injection volume of a single tuyere small sleeve in the total injected gas volume is as follows:

[0029]

[0030] Where: Q1 is the theoretical hot gas injection volume of a single tuyere small set; Q 总 is the total injected gas volume; K is the proportion of the hot gas injection volume of a theoretical single tuyere small sleeve in the total injected gas volume.

[0031] Option 8 is the preferred option of Option 3. In S7, the calculation formula for the theoretical oxygen supply of a single tuyere sleeve is as follows:

[0032]

[0033] Where: L 理论 is the theoretical oxygen supply of a single tuyere sleeve; K is the proportion of the theoretical hot gas injection volume of a single tuyere sleeve in the total injected gas volume; z is the oxygen injection volume consumed in the tuyere sleeve per ton of iron in the blast furnace; m is the daily output benchmark of the blast furnace; h is the blast furnace operation time, h = 24.

[0034] Solution 9, which is a preferred solution of Solution 3, in S8, the calculation formula of the deviation value is as follows:

[0035] ΔL=L 理论 -L 实际

[0036] Where: ΔL is the deviation between the theoretical oxygen supply of a single tuyere sleeve and the actual oxygen supply of the tuyere sleeve; L 理论 L is the theoretical oxygen supply of a single tuyere small set; 实际 It is the actual oxygen supply of the tuyere small set.

[0037] Option 10 is a preferred option of Option 3. In S9, the ratio of the deviation value to the opening of the electronically controlled regulating valve is 1:0.9. The oxygen supply of the tuyere sleeve can be dynamically adjusted by adjusting the ratio of the deviation value to the opening of the electronically controlled regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of a device for matching oxygen supply quantity of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to the present invention;

[0039] Figure 2This is a schematic diagram of a capacitive microphone and a central control room host in a device for matching oxygen supply quantity of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to the present invention;

[0040] Figure 3 This is an enlarged view of a condenser microphone in a hydrogen-rich carbon cycle oxygen blast furnace tuyere oxygen supply matching device based on audio frequency measurement according to the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below through specific embodiments:

[0042] The figure marks in the drawings of the specification include: 1. blast furnace body; 2. optical transmitter; 3. optical receiver; 4. main unit in the central control room; 5. air inlet sleeve; 6. hot gas pipe; 7. oxygen pipe; 8. electromagnetic flowmeter; 9. hot gas branch pipe; 10. electric control regulating valve; 11. L-shaped flat iron; 12. condenser microphone; 13. protective box; 15. ceramic fiber cloth; 16. nitrogen pipe; 17. one-way valve.

[0043] Example 1

[0044] like Figures 1 to 3 As shown: A hydrogen-rich carbon cycle oxygen blast furnace tuyere oxygen supply matching device based on audio frequency measurement, including a blast furnace body 1, an optical transmitter 2, an optical receiver 3 and a central control room host 4, the air inlet end of the blast furnace body 1 is connected to a tuyere small sleeve 5, the tuyere small sleeve 5 is respectively connected to a hot gas pipe 6 and an oxygen pipe 7, the oxygen pipe 7 is provided with an electromagnetic flowmeter 8 and an electronically controlled regulating valve 10, the oxygen pipe 7 is connected to a nitrogen pipe 16, the nitrogen pipe 16 is provided with a one-way valve 17, one end of the hot gas pipe 6 is flange-connected to a hot gas branch pipe 9, the flange connection between the hot gas pipe 6 and the hot gas branch pipe 9 is bolted with an L-shaped flat iron 11, the L-shaped flat iron A condenser microphone 12 is connected to the clamp on 11, a protective box 13 is provided on the L-shaped flat iron 11, the condenser microphone 12 is located in the protective box 13, one side of the protective box 13 is detachably connected to a switch door, a sealing ring is provided at the gap of the switch door, a sound-absorbing sponge is provided in the protective box 13, and a ceramic fiber cloth 15 is provided on the outer surface of the protective box 13. The condenser microphone 12 and the electromagnetic flowmeter 8 are electrically connected to the optical transmitter 2, the optical transmitter 2 is electrically connected to the optical receiver 3, the optical receiver 3 is electrically connected to the PLC controller, the central control room host 4 is electrically connected to the PLC controller, and the electronically controlled regulating valve 10 is electrically connected to the PLC controller.

[0045] The implementation method of this embodiment is as follows: first, hot gas enters the blast furnace body 1 through the hot gas branch pipe 9, the hot gas pipe 6, and the tuyere sleeve 5. Simultaneously, oxygen enters the blast furnace body 1 through the oxygen pipe 7 and the tuyere sleeve 5. During this process, the condenser microphone 12 converts the sound frequency generated by the hot gas in the hot gas pipe 6 into an electrical signal in real time. The electrical signal is transmitted to the optical transmitter 2 for conversion into an optical signal. The optical signal is then transmitted to the optical receiver 3 for conversion into an electrical signal. The electrical signal is then transmitted to the central control room host 4 via a PLC controller. After receiving the electrical signal of the hot gas sound frequency, the central control room host 4 calculates the theoretical oxygen supply of a single tuyere sleeve. The theoretical oxygen supply of the tuyere sleeve is then compared with the actual oxygen supply of the tuyere sleeve to calculate a deviation. Then, based on the calculated deviation, the central control room host issues a command to the PLC controller to adjust the opening of the electronically controlled regulating valve on the oxygen pipe. The PLC controller increases or decreases the opening of the electronically controlled regulating valve according to the deviation value to ensure that the actual oxygen supply of the tuyere sleeve is the same as the theoretical oxygen supply of the tuyere sleeve.

[0046] Example 2

[0047] A method for adjusting the oxygen supply amount of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement comprises the following steps:

[0048] S1. First, hot gas enters the blast furnace body 1 through the hot gas branch pipe 9, the hot gas pipe 6 and the tuyere sleeve 5. At the same time, oxygen enters the blast furnace body 1 through the oxygen pipe 7 and the tuyere sleeve 5.

[0049] S2, the condenser microphone 12 converts the sound frequency generated by the hot gas in the hot gas pipe 6 into an electrical signal, which is transmitted to the optical transmitter 2 and converted into an optical signal. The optical signal is transmitted to the optical receiver 3 and converted into an electrical signal. The electrical signal is transmitted to the host computer 4 in the central control room via the PLC controller;

[0050] S3. After receiving the electrical signal of the hot gas sound frequency, the host computer 4 in the central control room calculates the hot gas sound frequency. The calculation formula of the sound frequency is as follows:

[0051]

[0052] Where: K max is the peak value of audio detection; N is the number of audio sampling points; f s is the audio sampling frequency;

[0053] S4. Calculate the theoretical hot gas flow velocity based on the audio frequency. The calculation formula for the theoretical hot gas flow velocity is as follows:

[0054]

[0055] Where: U 理论 is the theoretical hot gas flow velocity; f is the hot gas sound frequency; S t is the Strouhal number, St =0.2; D is the diameter of the hot gas pipe; C O is the reference speed of sound in air, C O =343m / s; C 热煤气 is the speed of sound of hot gas;

[0056] S5. Calculate the theoretical hot gas injection rate of a single tuyere small set based on the theoretical hot gas flow rate. The calculation formula for the theoretical hot gas injection rate of a single tuyere small set is as follows:

[0057] Q1=U 理论 ·nS

[0058] Where: U 理论 is the theoretical hot gas flow rate; Q1 is the theoretical hot gas injection volume of a single tuyere sleeve; S is the cross-sectional area of the tuyere sleeve; n is the number of tuyere sleeves, n=1;

[0059] S6. Calculate the proportion of the theoretical hot gas injection volume of a single tuyere small set in the total injected gas volume based on the theoretical hot gas injection volume of a single tuyere small set. The calculation formula for the proportion of the theoretical hot gas injection volume of a single tuyere small set in the total injected gas volume is as follows:

[0060]

[0061] Where: Q1 is the theoretical hot gas injection volume of a single tuyere small set; Q 总 is the total injected gas volume; K is the proportion of the hot gas injection volume of a theoretical single tuyere small set in the total injected gas volume;

[0062] S7. Calculate the theoretical oxygen supply of a single tuyere small set based on the proportion of the theoretical hot gas injection volume of a single tuyere small set in the total injected gas volume. The calculation formula for the theoretical oxygen supply of a single tuyere small set is as follows:

[0063]

[0064] Where: L 理论 is the theoretical oxygen supply of a single tuyere sleeve; K is the proportion of the theoretical hot gas injection volume of a single tuyere sleeve in the total injected gas volume; z is the oxygen injection volume consumed by the tuyere sleeve per ton of iron in the blast furnace; m is the daily output benchmark of the blast furnace; h is the blast furnace operating time, h = 24;

[0065] S8. Compare the theoretical oxygen supply of the tuyere sleeve with the actual oxygen supply of the tuyere sleeve and calculate the deviation value. The calculation formula of the deviation value is as follows:

[0066] ΔL=L 理论 -L 实际

[0067] Where: ΔL is the deviation between the theoretical oxygen supply of a single tuyere sleeve and the actual oxygen supply of the tuyere sleeve; L 理论 L is the theoretical oxygen supply of a single tuyere small set; 实际 is the actual oxygen supply of the tuyere small set;

[0068] S9. After calculating the deviation value, the host in the central control room adjusts the opening of the electric control valve on the oxygen pipe through the PLC controller so that the actual oxygen supply of the air outlet small sleeve is the same as the theoretical oxygen supply of the air outlet small sleeve. The ratio of the deviation value to the opening of the electric control valve is 1:0.9.

[0069] Table 1. The relationship between the deviation value (the amount of oxygen supplied by the air inlet sleeve) and the opening of the electronically controlled regulating valve

[0070]

[0071]

[0072] Example 3

[0073] A method for adjusting the oxygen supply amount of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement comprises the following steps:

[0074] S1. First, hot gas enters the blast furnace body 1 through the hot gas branch pipe 9, the hot gas pipe 6 and the tuyere sleeve 5. At the same time, oxygen enters the blast furnace body 1 through the oxygen pipe 7 and the tuyere sleeve 5.

[0075] S2, the condenser microphone 12 converts the sound frequency generated by the hot gas in the hot gas pipe 6 into an electrical signal, which is transmitted to the optical transmitter 2 and converted into an optical signal. The optical signal is transmitted to the optical receiver 3 and converted into an electrical signal. The electrical signal is transmitted to the host computer 4 in the central control room via the PLC controller;

[0076] S3. After receiving the electrical signal of the hot gas sound frequency, the host computer 4 in the central control room calculates the hot gas sound frequency. The calculation formula of the sound frequency is as follows:

[0077]

[0078] The host in the central control room obtained: N is 490, f s 500Hz, K max is 230, calculate the audio frequency f:

[0079]

[0080] f=234.69Hz

[0081] Where: f is the sound frequency of hot gas; K max is the peak value of audio detection; N is the number of audio sampling points; f s is the audio sampling frequency;

[0082] S4. Calculate the theoretical hot gas flow velocity based on the audio frequency. The calculation formula for the theoretical hot gas flow velocity is as follows:

[0083]

[0084] Where, f = 234.69 Hz is known, and C is obtained by measurement. 热煤气 =412m / s, C O =343m / s, D=0.12m, S t =0.2, calculate the theoretical hot coal gas flow rate U 理论 :

[0085]

[0086] U 理论 =169.14m / s

[0087] Where: U 理论 is the theoretical hot gas flow velocity; f is the hot gas sound frequency; S t is the Strouhal number, S t =0.2; D is the diameter of the hot gas pipe; C O is the reference speed of sound in air, C O =343m / s; C 热煤气 is the speed of sound of hot gas;

[0088] S5. Calculate the theoretical hot gas injection rate of a single tuyere small set based on the theoretical hot gas flow rate. The calculation formula for the theoretical hot gas injection rate of a single tuyere small set is as follows:

[0089] Q1=U 理论 ·nS

[0090] Among them, it is known that U 理论 =169.14m / s, n=1, Calculate the hot gas injection volume Q1 of a single tuyere small sleeve:

[0091] Q1=169.14×1×0.0113=1.911m 3 / s

[0092] Where: U 理论 is the theoretical hot gas flow rate; Q1 is the theoretical hot gas injection volume of a single tuyere sleeve; S is the cross-sectional area of the tuyere sleeve; n is the number of tuyere sleeves, n = 1; π is pi, π is 3.14, D is the diameter of the hot gas pipe, D = 0.12m;

[0093] S6. Calculate the proportion of the theoretical hot gas injection volume of a single tuyere small set in the total injected gas volume based on the theoretical hot gas injection volume of a single tuyere small set. The calculation formula for the proportion of the theoretical hot gas injection volume of a single tuyere small set in the total injected gas volume is as follows:

[0094]

[0095] Among them, it is known that Q 总 =50m 3 / s, Q1=1.911m 3 / s, calculate the proportion K:

[0096]

[0097] Where: Q1 is the theoretical hot gas injection volume of a single tuyere small set; Q 总 is the total injected gas volume; K is the proportion of the hot gas injection volume of a theoretical single tuyere small set in the total injected gas volume;

[0098] S7. Calculate the theoretical oxygen supply of a single tuyere small set based on the proportion of the theoretical hot gas injection volume of a single tuyere small set in the total injected gas volume. The calculation formula for the theoretical oxygen supply of a single tuyere small set is as follows:

[0099]

[0100] Among them, it is known that K = 0.03822, z = 450m 3 , m = 5000t, h = 24, calculate the theoretical oxygen supply L of a single tuyere small set 理论 :

[0101]

[0102] L 理论 =23.8875m 3 / s

[0103] Where: L 理论 is the theoretical oxygen supply of a single tuyere sleeve; K is the proportion of the theoretical hot gas injection volume of a single tuyere sleeve in the total injected gas volume; z is the oxygen injection volume consumed by the tuyere sleeve per ton of iron in the blast furnace; m is the daily output benchmark of the blast furnace; h is the blast furnace operating time, h = 24;

[0104] S8. Compare the theoretical oxygen supply of the tuyere sleeve with the actual oxygen supply of the tuyere sleeve and calculate the deviation value. The calculation formula of the deviation value is as follows:

[0105] ΔL=L 理论 -L 实际

[0106] Among them, it is known that L 理论=23.8875m 3 / s,L 实际 =26m 3 / s, calculate the deviation value ΔL:

[0107] ΔL=23.8875-26=-2.1125m 3 / s

[0108] Where: ΔL is the deviation between the theoretical oxygen supply of a single tuyere sleeve and the actual oxygen supply of the tuyere sleeve; L 理论 L is the theoretical oxygen supply of a single tuyere small set; 实际 is the actual oxygen supply of the tuyere small set;

[0109] S9. Calculate the deviation value ΔL = -2.1125m 3 / s later, the main unit in the central control room reduces the opening of the electric control valve on the oxygen tube through the PLC controller by 1.9%, so that the actual oxygen supply of the air outlet small set is the same as the theoretical oxygen supply of the air outlet small set. The ratio of the deviation value to the opening of the electric control valve is 1:0.9. If the calculated deviation value is positive, the opening of the electric control valve on the oxygen tube needs to be increased. If the calculated deviation value is negative, the opening of the electric control valve on the oxygen tube needs to be reduced.

[0110] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection 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 device for matching the oxygen supply quantity of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement, characterized in that: The invention comprises a blast furnace body (1), an optical transmitter (2), an optical receiver (3) and a central control room host (4); the air inlet end of the blast furnace body (1) is connected to a tuyere sleeve (5); the tuyere sleeve (5) is respectively connected to a hot gas pipe (6) and an oxygen pipe (7); the oxygen pipe (7) is provided with an electromagnetic flowmeter (8) and an electric control regulating valve (10); one end of the hot gas pipe (6) is flange-connected to a hot gas branch pipe (9); the hot gas pipe (6) and the hot gas branch pipe (9) are flange-connected to each other; An L-shaped flat iron (11) is detachably connected to the flange connection, a condenser microphone (12) is detachably connected to the L-shaped flat iron (11), the condenser microphone (12) and the electromagnetic flowmeter (8) are electrically connected to the optical transmitter (2), the optical transmitter (2) is electrically connected to the optical receiver (3), the optical receiver (3) is electrically connected to the PLC controller, the central control room host (4) is electrically connected to the PLC controller, and the electrically controlled regulating valve (10) is electrically connected to the PLC controller.

2. The device for matching oxygen supply quantity of hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to claim 1, characterized in that: A protection box (13) is provided on the L-shaped flat iron (11), the condenser microphone (12) is located in the protection box (13), and a switch door (14) is detachably connected to one side of the protection box (13).

3. The method for adjusting the oxygen supply matching device for a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to any one of claims 1 or 2, characterized in that: The following steps are involved: S1. First, hot gas enters the blast furnace body (1) through the hot gas branch pipe (9), the hot gas pipe (6) and the tuyere sleeve (5). At the same time, oxygen enters the blast furnace body (1) through the oxygen pipe (7) and the tuyere sleeve (5). S2, the condenser microphone (12) converts the sound frequency generated by the hot gas in the hot gas pipe (6) into an electrical signal, which is transmitted to the optical transmitter (2) and converted into an optical signal, which is transmitted to the optical receiver (3) and converted into an electrical signal, which is transmitted to the main unit (4) in the central control room via the PLC controller; S3, after receiving the electrical signal of the hot gas sound frequency, the host computer (4) in the central control room calculates the hot gas sound frequency; S4. Calculate theoretical hot gas flow velocity based on the audio frequency; S5. Calculate the theoretical hot gas injection volume of a single tuyere small set based on the theoretical hot gas flow velocity; S6. Calculate the proportion of the theoretical hot gas injection volume of a single tuyere small set in the total injected gas volume based on the theoretical hot gas injection volume of a single tuyere small set; S7. Calculate the theoretical oxygen supply capacity of a single tuyere small set based on the proportion of the theoretical hot gas injection capacity of a single tuyere small set in the total injected gas capacity; S8. Compare the theoretical oxygen supply of the tuyere small sleeve with the actual oxygen supply of the tuyere small sleeve, and calculate the deviation value; S9. After calculating the deviation value, the host in the central control room adjusts the opening of the electric control valve on the oxygen pipe through the PLC controller so that the actual oxygen supply of the air outlet small set is the same as the theoretical oxygen supply of the air outlet small set.

4. The method for adjusting the oxygen supply amount of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to claim 3, characterized in that: In S3, the calculation formula of the audio frequency is as follows: Where: f is the sound frequency of hot gas; K max is the peak value of audio detection; N is the number of audio sampling points; f s is the audio sampling frequency.

5. The method for adjusting oxygen supply in a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to claim 3, characterized in that: In S4, the calculation formula of the theoretical hot coal gas flow rate is as follows: Where: U 理论 is the theoretical hot gas flow velocity; f is the hot gas sound frequency; S t is the Strouhal number, S t =0.2; D is the diameter of the hot gas pipe; C O is the reference speed of sound in air, C O =343m / s; C 热煤气 is the speed of sound of hot gas.

6. The method for adjusting the oxygen supply quantity of a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to claim 3, characterized in that: In S5, the calculation formula for the theoretical single tuyere small sleeve hot gas injection amount is as follows: Q1=U 理论 ·nS Where: U 理论 is the theoretical hot gas flow rate; Q1 is the theoretical hot gas injection volume of a single tuyere sleeve; S is the cross-sectional area of the tuyere sleeve; n is the number of tuyere sleeves, n=1.

7. The method for adjusting oxygen supply in a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to claim 3, characterized in that: In S6, the calculation formula for the proportion of the theoretical hot gas injection volume of a single tuyere small sleeve in the total injected gas volume is as follows: Where: Q1 is the theoretical hot gas injection volume of a single tuyere small set; Q 总 is the total injected gas volume; K is the proportion of the hot gas injection volume of a theoretical single tuyere small sleeve in the total injected gas volume.

8. The method for adjusting oxygen supply in a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to claim 3, characterized in that: In S7, the calculation formula for the theoretical oxygen supply of a single tuyere sleeve is as follows: Where: L 理论 is the theoretical oxygen supply of a single tuyere sleeve; K is the proportion of the theoretical hot gas injection volume of a single tuyere sleeve in the total injected gas volume; z is the oxygen injection volume consumed in the tuyere sleeve per ton of iron in the blast furnace; m is the daily output benchmark of the blast furnace; h is the blast furnace operation time, h = 24.

9. The method for adjusting oxygen supply in a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to claim 3, characterized in that: In S8, the calculation formula of the deviation value is as follows: ΔL=L 理论 -L 实际 Where: ΔL is the deviation between the theoretical oxygen supply of a single tuyere sleeve and the actual oxygen supply of the tuyere sleeve; L 理论 L is the theoretical oxygen supply of a single tuyere small set; 实际 It is the actual oxygen supply of the tuyere small set.

10. The method for adjusting oxygen supply in a hydrogen-rich carbon cycle oxygen blast furnace tuyere based on audio frequency measurement according to claim 3, characterized in that: In S9, the ratio of the deviation value to the opening of the electronically controlled regulating valve is 1:0.9.

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