CN117965832A - Environment-friendly self-adaptive control device and control method for uniform coal injection and blowing of blast furnace - Google Patents

Abstract

The invention discloses an environment-friendly self-adaptive control device and a control method for uniform coal injection of a blast furnace, comprising the following steps: the device comprises a first mounting table, a pulverized coal tank, a first gas tank, an intelligent V-shaped regulating valve, a second mounting table, a second gas tank, a smelting tank, a smoke exhaust pipe and a pulverized coal nozzle, wherein the pulverized coal tank is arranged at the first mounting table; the coal dust tank is connected with the first air tank, the coal dust spray head is connected with the coal dust tank, the intelligent V-shaped regulating valve is located the coal dust tank with between the coal dust spray head, the intelligent V-shaped regulating valve is close to one end of the coal dust spray head is provided with a coal dust flow rate sensing detector capable of monitoring the coal dust circulation speed in real time, the coal dust flow rate sensing detector cooperates with the intelligent V-shaped regulating valve to work, the coal dust flow rate flowing out of the intelligent V-shaped regulating valve is monitored in real time, so that the coal dust flow rate can be known more intuitively, and data support is provided for self-adaptive regulation of the intelligent V-shaped regulating valve.

Description

An environmentally friendly blast furnace uniform coal injection adaptive control device and control method

Technical Field

The invention relates to the field of blast furnace coal injection, and in particular to an environmentally friendly blast furnace uniform coal injection adaptive control device and a control method.

Background technique

Blast furnace coal injection refers to the direct injection of finely ground coal into the blast furnace through the blast furnace tuyere as a reducing agent for blast furnace ironmaking, while replacing part of the coke, thereby achieving the purpose of reducing ironmaking costs and reducing pollutant emissions. Blast furnace coal injection technology has significant advantages in energy saving, emission reduction and consumption reduction, and has become an important means for modern steel companies to reduce pig iron costs, improve pig iron quality and reduce environmental pollution.

Blast furnace coal injection has particularly strict requirements on the uniformity of coal powder injection. If the coal powder injection is uneven, harmful gases such as carbon monoxide will be produced, which will not only affect the safe operation of the blast furnace, but also cause harm to social public safety.

In order to ensure the uniformity of coal injection, the prior art generally adopts the method of installing a regulating valve, such as installing an ordinary O-type ball valve. Although this regulating valve can play a certain role in controlling the uniformity of coal powder injection. However, it is far from enough to ensure the uniformity of injection by simply installing a regulating valve, and it is also impossible to achieve real-time control and adjustment of coal injection. During the injection process, if an emergency occurs, it is also difficult to control and adjust the uniformity of injection through a regulating valve in the first time.

Therefore, there is an urgent need for an environmentally friendly blast furnace uniform coal injection adaptive control device and control method to solve the technical problems existing in the above-mentioned prior art.

Summary of the invention

The invention overcomes the shortcomings of the prior art and provides an environmentally friendly blast furnace uniform coal injection adaptive control device and control method.

To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an environmentally friendly blast furnace uniform coal injection adaptive control device and control method, including: a first mounting platform, a pulverized coal tank installed at the first mounting platform, a first gas tank, an intelligent V-shaped regulating valve, a second mounting platform, a second gas tank installed at the second mounting platform, a smelting tank, a smoke exhaust pipe, and a pulverized coal nozzle.

The pulverized coal tank is connected to the first gas tank, the pulverized coal nozzle is connected to the pulverized coal tank, the intelligent V-shaped regulating valve is located between the pulverized coal tank and the pulverized coal nozzle, and a pulverized coal flow rate sensing detector capable of monitoring the pulverized coal circulation rate in real time is provided at one end of the intelligent V-shaped regulating valve close to the pulverized coal nozzle.

The nozzle of the pulverized coal nozzle is inserted into the interior of the smelting tank. An auxiliary air pipe is arranged at the second gas tank. A plurality of auxiliary nozzles inserted into the smelting tank are arranged at the end of the auxiliary air pipe. The auxiliary nozzles are evenly distributed around the pulverized coal nozzle. The auxiliary air pipe is connected in parallel with the auxiliary nozzles.

In a preferred embodiment of the present invention, the gas in the first gas tank and the second gas tank is one of an inert gas and compressed air.

In a preferred embodiment of the present invention, the number of the auxiliary nozzles is at least 4.

In a preferred embodiment of the present invention, each of the auxiliary nozzles is provided with a regulating valve.

In a preferred embodiment of the present invention, the direction of the gas sprayed by the auxiliary nozzle is consistent with the spraying direction of the coal powder nozzle.

In a preferred embodiment of the present invention, the distance between the auxiliary nozzle and the pulverized coal nozzle is 1 to 3 times the diameter of the nozzle of the pulverized coal nozzle.

In a preferred embodiment of the present invention, the nozzle diameter of the auxiliary nozzle is 1/2 to 2/3 of the nozzle diameter of the coal powder nozzle, including the extreme value of the range.

In a preferred embodiment of the present invention, a first air pipe and a second air pipe are provided at the first gas tank, a boosting pipe is provided at the bottom of the pulverized coal tank, the first air pipe is connected to the top of the pulverized coal tank, the second air pipe is connected to the boosting pipe, the other end of the boosting pipe is connected to the intelligent V-shaped regulating valve through a coal conveying pipe, a coal injection pipe is provided at the other end of the intelligent V-shaped regulating valve, a mounting seat is provided at the end of the coal injection pipe, the pulverized coal nozzle and the auxiliary nozzle are both installed on the mounting seat, and a smoke exhaust pipe is provided on the top of the smelting tank.

In a preferred embodiment of the present invention, an environmentally friendly blast furnace uniform coal injection adaptive control method comprises the following steps:

S1. Set the initial setting value of the total flow rate of pulverized coal flowing out of the intelligent V-type regulating valve per unit time; use the pulverized coal flow rate sensor detector to monitor the pulverized coal flow rate at the output end of the intelligent V-type regulating valve in real time, denoted as K, in cm/min.

S2. The cross-sectional area of the pipeline when the intelligent V-type regulating valve is fully opened is calculated and recorded as S ₁ . The calculation expression is:

;

Wherein, S ₁ is the pipe cross-sectional area of the intelligent V-type regulating valve in the fully open state, unit: cm ² ; d is the diameter of the V-type ball valve of the intelligent V-type regulating valve, unit: cm; π is a mathematical constant.

S3. According to the opening angle of the V-type ball valve, the angle is converted into radians to obtain the opening width of the intelligent V-type regulating valve in the incompletely opened state. The calculation expression is:

; /> ;

Wherein, N is the opening width of the intelligent V-type regulating valve in the incompletely opened state, unit: cm; β is the actual opening angle of the intelligent V-type regulating valve, unit: degree; α is the opening angle of the V-type ball valve, unit: degree; π is a mathematical constant; d is the diameter of the V-type ball valve of the intelligent V-type regulating valve, unit: cm.

S4. Combined with the actual opening of the intelligent V-type regulating valve and the length of the V-type ball valve of the intelligent V-type regulating valve, the cross-sectional area of the pipeline when the pulverized coal flows through the intelligent V-type regulating valve is calculated, which is recorded as S ₂ . The calculation expression is:

;

Wherein, S ₂ is the pipe cross-sectional area of the intelligent V-type regulating valve in the incompletely opened state, unit: cm ² ; π is a mathematical constant; N is the opening width of the intelligent V-type regulating valve in the incompletely opened state, unit: cm; L is the length of the V-type ball valve of the intelligent V-type regulating valve, unit: cm.

S5. Combine the values obtained in steps S1, S2, S3, and S4 to calculate the total flow of pulverized coal flowing out of the intelligent V-type regulating valve per unit time. The calculation expression is:

; /> ;

In the formula, _G1 is the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time when the intelligent V-type regulating valve is fully opened, unit: kg; _G2 is the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time when the intelligent V-type regulating valve is not fully opened, unit: kg; K is the coal powder circulation velocity obtained in step S1, unit: cm/min; ρ is the density of coal powder, which is 800kg/ ^m3 here; _S1 is the pipeline cross-sectional area when the intelligent V-type regulating valve is fully opened, unit: ^cm2 ; _S2 is the pipeline cross-sectional area when the intelligent V-type regulating valve is not fully opened, unit: ^cm2 ; T is unit time, unit: min.

S6. According to the total flow rate of pulverized coal flowing out of the intelligent V-type regulating valve per unit time obtained in step S5, the pressure loss pressure drop value of the pulverized coal nozzle in the working state is calculated in combination with the length and radius of the pulverized coal nozzle pipeline and the pulverized coal circulation velocity detected by the pulverized coal flow velocity sensing detector, and the loss pressure drop value is summed with the initial set gas pressure value of the auxiliary nozzle, and the gas pressure value sprayed by the auxiliary nozzle is changed in real time. The calculation expression is:

; /> ; /> ;

In the formula, is the Reynolds number; ρ is the density of coal powder, which is 800kg/m ³ ; K is the flow rate of coal powder in the coal powder nozzle pipe, unit: cm/min; d is the length of the coal powder nozzle pipe, unit: cm; μ is the viscosity coefficient of coal powder, which is a fixed value of 15;/> is the loss pressure drop value of the pulverized coal nozzle in the working state, unit: MPa; G _(1,2) is the total pulverized coal flow rate flowing out of the intelligent V-type regulating valve per unit time when the intelligent V-type regulating valve is fully opened or not fully opened, unit: kg; r is the radius of the pulverized coal nozzle pipeline, unit: cm; P is the ejection gas pressure value of the auxiliary nozzle, unit: MPa; _P0 is the initial ejection gas pressure value of the auxiliary nozzle, unit: MPa.

In a preferred embodiment of the present invention, the pressure drop lost by the nozzle is supplemented so that the pressure value when the nozzle sprays coal powder is at a stable value, thereby ensuring uniform spraying.

In a preferred embodiment of the present invention, the opening angle of the V-shaped ball valve in step S3 is 30° to 90°.

The present invention solves the defects existing in the background technology and has the following beneficial effects:

(1) The present invention is provided with an intelligent V-shaped regulating valve, a coal powder flow rate sensing detector, a coal powder nozzle, and a plurality of auxiliary nozzles. When in use, the coal powder flow rate sensing detector cooperates with the intelligent V-shaped regulating valve to monitor the coal powder flow rate flowing out of the intelligent V-shaped regulating valve in real time, so that the coal powder flow rate can be more intuitively understood, thereby providing data support for the adaptive regulation of the intelligent V-shaped regulating valve; the intelligent V-shaped regulating valve has an equal percentage flow rate regulation characteristic, so that the flow rate of the coal powder can be more accurately and flexibly regulated, thereby making the regulation speed faster and the maintenance simpler, and it can also shred the larger solid particles in the coal powder, thereby avoiding the occurrence of valve channel blockage; the auxiliary nozzle cooperates with the coal powder nozzle to work, and can also fine-tune the flow rate and opening time of each auxiliary air flow pipe according to actual conditions, optimize the coal powder flow direction, thereby effectively avoiding the generation of air flow turbulence around the coal powder nozzle, ensuring the uniformity of coal powder injection, thereby ensuring that the coal powder can be fully burned, thereby effectively avoiding the emission of harmful gases generated by incomplete combustion into the atmosphere to endanger social public safety, thereby making the operation process more environmentally friendly. This solves the problems of uneven coal powder injection and environmentally unfriendly operation in the prior art.

(2) The present invention calculates the opening width of the intelligent V-type regulating valve in a fully open state and the opening width of the intelligent V-type regulating valve in an incompletely open state. When in use, since the opening widths of the intelligent V-type regulating valve in different opening states are inconsistent, the mass of coal powder flowing through the units is also inconsistent. Therefore, through different calculation formulas, the opening width of the intelligent V-type regulating valve in different states can be accurately and effectively calculated, thereby more accurately calculating the total flow rate of coal powder flowing through the units, thereby ensuring that the coal powder is sprayed more evenly.

(3) The present invention uses an intelligent computing system. When the intelligent computing system detects that the value of the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time has changed, the intelligent V-type regulating valve can be adjusted in a timely and accurate manner to thereby return the value of the coal powder flow out per unit time to the initial set value, thereby further ensuring the uniformity of coal powder injection.

(4) The present invention uses an intelligent computing system to timely and accurately calculate the total coal powder flow rate in the current intelligent V-type regulating valve opening state per unit time according to the coal powder flow rate monitored in real time by the coal powder flow rate sensing detector and the reference to the opening state of the intelligent V-type regulating valve in the current situation, and compares it with the initial set value. When there is any inconsistency, the opening state of the intelligent V-type regulating valve is controlled in a timely and accurate manner, thereby ensuring that the device can accurately and efficiently control the coal powder injection situation and improve the adaptability of the device.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the flow structure of a blast furnace coal injection device according to the present invention;

FIG2 is an enlarged structural schematic diagram of the intelligent V-shaped regulating valve of the present invention;

FIG3 is an enlarged structural schematic diagram of a coal powder nozzle and an auxiliary nozzle of the present invention;

FIG4 is a flow chart of the environmentally friendly blast furnace uniform coal injection adaptive control method provided by the present invention.

In the figure: 1. first mounting platform; 2. pulverized coal tank; 2.1. booster pipe; 3. first gas tank; 4. first gas pipe; 5. second gas pipe; 6. intelligent V-type regulating valve; 7. coal conveying pipe; 7.1. coal injection pipe; 8. mounting base; 9. second mounting platform; 10. second gas tank; 11. auxiliary gas pipe; 12. smelting tank; 13. exhaust pipe; 14. pulverized coal flow rate induction detector; 15. pulverized coal nozzle; 16. auxiliary nozzle.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

As shown in Figures 1 and 2, an environmentally friendly blast furnace uniform coal injection adaptive control device and control method include: a first mounting platform 1, a pulverized coal tank 2 installed at the first mounting platform 1, a first gas tank 3, an intelligent V-shaped regulating valve 6, a second mounting platform 9, a second gas tank 10 installed at the second mounting platform 9, a smelting tank 12, a smoke exhaust pipe 13, and a pulverized coal nozzle 15.

A first air pipe 4 and a second air pipe 5 are provided at the first gas tank 3, a boosting pipe 2.1 is provided at the bottom of the pulverized coal tank 2, the first air pipe 4 is connected to the top of the pulverized coal tank 2, the second air pipe 5 is connected to the boosting pipe 2.1, the other end of the boosting pipe 2.1 is connected to the intelligent V-shaped regulating valve 6 through a coal conveying pipe 7, a coal injection pipe 7.1 is provided at the other end of the intelligent V-shaped regulating valve 6, a mounting seat 8 is provided at the end of the coal injection pipe 7.1, a pulverized coal nozzle 15 and an auxiliary nozzle 16 are both installed on the mounting seat 8, and a smoke exhaust pipe 13 is provided at the top of the smelting tank 12.

The intelligent V-shaped regulating valve 6 is located between the coal powder tank 2 and the coal powder nozzle 15 . One end of the intelligent V-shaped regulating valve 6 close to the coal powder nozzle 15 is provided with a coal powder flow rate sensing detector 14 capable of monitoring the coal powder circulation speed in real time.

The nozzle of the pulverized coal nozzle 15 is inserted into the interior of the smelting tank 12, and an auxiliary gas pipe 11 is provided at the second gas tank 10. The end of the auxiliary gas pipe 11 is provided with a plurality of auxiliary nozzles 16 inserted into the smelting tank 12, and the auxiliary nozzles 16 are evenly distributed around the pulverized coal nozzle 15, and the auxiliary gas pipe 11 is connected in parallel with the auxiliary nozzles 16. The gas in the first gas tank 3 and the second gas tank 10 is one of an inert gas and compressed air.

In one embodiment, the inert gas is one of nitrogen, argon and helium.

As shown in FIG3 , the number of auxiliary nozzles 16 is at least 4, and each auxiliary nozzle 16 is provided with a regulating valve, the gas direction ejected by the auxiliary nozzle 16 is consistent with the ejection direction of the coal powder nozzle 15, the distance between the auxiliary nozzle 16 and the coal powder nozzle 15 is 1 to 3 times the nozzle diameter of the coal powder nozzle 15, and the nozzle diameter of the auxiliary nozzle 16 is 1/2 to 2/3 of the nozzle diameter of the coal powder nozzle 15, including the range extreme value. Thus, the flow direction of coal powder injection can be effectively controlled and optimized, and the influence of turbulence on the uniform injection of coal powder can be reduced.

As shown in FIG4 , an environmentally friendly blast furnace uniform coal injection adaptive control method comprises the following steps:

S1. Set the initial setting value of the total flow rate of pulverized coal flowing out of the intelligent V-type regulating valve per unit time; use the pulverized coal flow rate sensor detector to monitor the pulverized coal flow rate at the output end of the intelligent V-type regulating valve in real time, denoted as K, in cm/min.

S2. The cross-sectional area of the pipeline when the intelligent V-type regulating valve is fully opened is calculated to be S ₁ , and its calculation expression is:

;

Wherein, S ₁ is the pipe cross-sectional area of the intelligent V-type regulating valve in the fully open state, unit: cm ² ; d is the diameter of the V-type ball valve of the intelligent V-type regulating valve, unit: cm; π is a mathematical constant with a value of 3.14.

S3. According to the opening angle of the V-type ball valve, the opening angle of the V-type ball valve is 30°~90°. The angle is converted into radians to obtain the opening width of the intelligent V-type regulating valve in the incompletely opened state. The calculation expression is:

; /> ;

Wherein, N is the opening width of the intelligent V-type regulating valve in the incompletely opened state, unit: cm; β is the actual opening angle of the intelligent V-type regulating valve, unit: degree; α is the opening angle of the V-type ball valve, unit: degree; π is a mathematical constant; d is the diameter of the V-type ball valve of the intelligent V-type regulating valve, unit: cm.

S4. Combined with the actual opening of the intelligent V-type regulating valve and the length of the V-type ball valve of the intelligent V-type regulating valve, the cross-sectional area of the pipeline when the pulverized coal flows through the intelligent V-type regulating valve is calculated, which is recorded as S ₂ . The calculation expression is:

;

Wherein, S ₂ is the pipe cross-sectional area of the intelligent V-type regulating valve in the incompletely opened state, unit: cm ² ; π is the mathematical constant 3.14; N is the opening width of the intelligent V-type regulating valve in the incompletely opened state, unit: cm; L is the length of the V-type ball valve of the intelligent V-type regulating valve, unit: cm.

S5. Combine the values obtained in steps S1, S2, S3, and S4 to calculate the total flow of pulverized coal flowing out of the intelligent V-type regulating valve per unit time. The calculation expression is:

; /> ;

In the formula, _G1 is the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time when the intelligent V-type regulating valve is fully opened, unit: kg; _G2 is the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time when the intelligent V-type regulating valve is not fully opened, unit: kg; K is the coal powder circulation velocity obtained in step S1, unit: cm/min; ρ is the density of coal powder, which is 800kg/ ^m3 here; _S1 is the pipeline cross-sectional area when the intelligent V-type regulating valve is fully opened, unit: ^cm2 ; _S2 is the pipeline cross-sectional area when the intelligent V-type regulating valve is not fully opened, unit: ^cm2 ; T is unit time, unit: min.

S6. According to the total flow rate of pulverized coal flowing out of the intelligent V-type regulating valve per unit time obtained in step S5, the pressure loss pressure drop value of the pulverized coal nozzle in the working state is calculated in combination with the length and radius of the pulverized coal nozzle pipeline and the pulverized coal circulation velocity detected by the pulverized coal flow velocity sensing detector, and the loss pressure drop value is summed with the initial set gas pressure value of the auxiliary nozzle, and the gas pressure value sprayed by the auxiliary nozzle is changed in real time. The calculation expression is:

; /> ; /> ;

In the formula, is the Reynolds number; ρ is the density of coal powder, which is 800kg/m ³ ; K is the flow rate of coal powder in the coal powder nozzle pipe, unit: cm/min; d is the length of the coal powder nozzle pipe, unit: cm; μ is the viscosity coefficient of coal powder, which is a fixed value of 15;/> is the loss pressure drop value of the pulverized coal nozzle in the working state, unit: MPa; G _(1,2) is the total flow rate of pulverized coal flowing out of the intelligent V-type regulating valve per unit time when the intelligent V-type regulating valve is fully opened or not fully opened, unit: kg; r is the radius of the pulverized coal nozzle pipeline, unit: cm; P is the ejection gas pressure value of the auxiliary nozzle, unit: MPa; _P0 is the initial ejection gas pressure value of the auxiliary nozzle, unit: MPa.

The experimental calculations were performed with the following parameters unchanged.

Coal powder with a density of ρ=800kg/m ³ is selected, and the viscosity coefficient of the coal powder is measured by existing equipment such as a rotational viscometer and a shear viscometer. In this embodiment, a constant of 15 is selected for experimental calculation; and an initial setting value _{G00=45.36kg of the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time in the fully open state of the intelligent V-type regulating valve is set in the intelligent computing system; an initial setting value G01 =} 10.32kg of the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time in the incompletely open state of the intelligent V-type regulating valve is set in the intelligent computing system.

The selected intelligent V-type regulating valve 6 has a ball valve length L of 4 cm, a V-type ball valve diameter d of 3.8 cm, a valve seat diameter of 19 cm, and a valve disc diameter of 19 cm. The radius of the auxiliary nozzle is 10 cm, and the value of π is 3.14. The initial setting of the spray gas pressure of the auxiliary nozzle is 5 MPa.

The opening angle of the V-shaped ball valve of the intelligent V-shaped regulating valve 6 is 60°; the intelligent V-shaped regulating valve 6 is installed between the coal conveying pipe 7 and the coal injection pipe 7.1; and the coal powder flow rate sensor detector is installed at the output end of the intelligent V-shaped regulating valve 6. Calculate the total flow rate of coal powder flowing out of the intelligent V-shaped regulating valve 6 within a unit time T=5min.

The coal injection nozzle 15 and four auxiliary nozzles 16 are all installed on the smelting tank 12, and the four auxiliary nozzles 16 are respectively located at the top, bottom, left and right of the coal injection nozzle 15; the distance between the auxiliary nozzle 16 and the coal powder nozzle 15 is twice the diameter of the coal powder nozzle nozzle; the nozzle diameter of the auxiliary nozzle 16 is 1/2 of the nozzle diameter of the coal powder nozzle 15; at the same time, the first gas tank 3 is connected to the coal injection nozzle 15, and the second gas tank 10 is connected to the auxiliary nozzle 16.

Embodiment 1

Calculate the total flow rate of pulverized coal flowing out of the intelligent V-type regulating valve per unit time when the intelligent V-type regulating valve is fully opened.

Start the coal injection switch, and the coal powder flow rate sensor detector timely monitors the speed of coal powder flowing out of the intelligent V-type regulating valve, and obtains the initial speed K=100000cm/min.

According to the known V-shaped ball valve diameter d=3.8cm of the intelligent V-shaped regulating valve, the pipe cross-sectional area _S1 = ^11.34cm2 of the intelligent V-shaped regulating valve in the fully open state is obtained by applying it into the calculation expression of the pipe cross-sectional area when the pulverized coal flows through the intelligent V-shaped regulating valve.

According to the obtained initial velocity K = 100000cm/min (1000m/min), the density of coal powder ρ = 800kg/m ³ , the pipe cross-sectional area S ₁ = 11.34cm ² (11.34·10 ^-6 m ² ) of the intelligent V-type regulating valve in the fully open state, the value of S ₁ is taken to two decimal places; it is substituted into the calculation expression of the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time, and the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time T = 5min is obtained G ₁ = 45.36kg.

Based on the total coal powder flow per unit time after the intelligent V-type regulating valve is fully opened, the loss pressure drop when the nozzle is working is calculated. =2.52MPa, so the gas pressure value sprayed by the auxiliary nozzle after real-time adjustment is 7.52MPa through summation calculation.

Embodiment 2

The difference from the above-mentioned embodiment 1 is that: the opening state of the intelligent V-shaped regulating valve is changed;

The coal powder flow rate sensing detector timely monitors the speed of coal powder flowing out of the intelligent V-type regulating valve and obtains the initial speed K=100000cm/min (1000m/min); the values of other parameters remain unchanged.

The calculated opening width of the intelligent V-type regulating valve in the incompletely opened state is approximately N=2.19cm, and the value of N is taken to two decimal places.

According to the obtained opening width of the intelligent V-shaped regulating valve in the incompletely opened state, the pipe cross-sectional area S ₂ =2.58 cm ² of the intelligent V-shaped regulating valve in the incompletely opened state is calculated.

According to the obtained initial velocity K = 100000cm/min (1000m/min), the density of coal powder ρ = 800kg/m ³ , the pipe cross-sectional area S ₁ = 2.58cm ² (2.58·10 ^-6 m ² ) of the intelligent V-type regulating valve in the fully open state, and substituted into the calculation expression of the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time, the total flow rate of coal powder flowing out of the intelligent V-type regulating valve per unit time T = 5min is obtained as G ₂ = 10.32kg.

Based on the total coal powder flow per unit time after the intelligent V-type regulating valve is fully opened, the loss pressure drop when the nozzle is working is calculated. =0.57MPa, so the gas pressure value sprayed by the auxiliary nozzle after real-time adjustment is 5.57MPa through summation calculation.

In this embodiment, when the intelligent V-type regulating valve 6 is in a fully open state, when the total flow rate _G1 of pulverized coal flowing out of the intelligent V-type regulating valve 6 within a unit time T=5min is not equal to the initial set value _G00 , the intelligent computing system will timely adjust the injection air pressure until _G1 is equal to the initial set value _G00 .

When the intelligent V-type regulating valve 6 is in an incompletely open state, and the total pulverized coal flow rate _G2 flowing out of the intelligent V-type regulating valve 6 within the unit time T=5min is not equal to the initial set value _G01 , the intelligent computing system will timely adjust the injection air pressure or adjust the opening state of the intelligent V-type regulating valve until _G2 is equal to the initial set value _G01 .

When the present invention is used, the coal powder flow rate sensing detector 14 cooperates with the intelligent V-shaped regulating valve 6 to work, and monitors the coal powder flow rate flowing out of the intelligent V-shaped regulating valve 6 in real time, thereby directly obtaining the coal powder flow rate, thereby providing data support for the adaptive regulation of the intelligent V-shaped regulating valve 6;

The intelligent computing system calculates the total flow of pulverized coal outflowing from the intelligent V-shaped regulating valve 6 per unit time under different opening states of the intelligent V-shaped regulating valve 6, and compares it with the initial set value. If there is a discrepancy, the intelligent computing system will automatically adjust the injection pressure or the opening state of the intelligent V-shaped regulating valve 6;

The auxiliary nozzle 16 cooperates with the pulverized coal nozzle 15 to work, thereby forming a guide channel at the nozzle of the pulverized coal nozzle 15, thereby reducing the influence of turbulence on the pulverized coal injection.

The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims (10)

1. An environment-friendly self-adaptive control device for uniform coal injection and injection of a blast furnace, comprising: the device comprises a first mounting table, a pulverized coal tank, a first gas tank, an intelligent V-shaped regulating valve, a second mounting table, a second gas tank, a smelting tank, a smoke exhaust pipe and a pulverized coal nozzle, wherein the pulverized coal tank is arranged at the first mounting table; the method is characterized in that:

The intelligent V-shaped regulating valve is positioned between the pulverized coal tank and the pulverized coal nozzle, and one end of the intelligent V-shaped regulating valve, which is close to the pulverized coal nozzle, is provided with a pulverized coal flow velocity sensing detector capable of monitoring pulverized coal flow velocity in real time;

The nozzle of the pulverized coal spray head is inserted into the smelting tank, an auxiliary air pipe is arranged at the second air tank, a plurality of auxiliary spray heads which are inserted into the smelting tank are arranged at the end part of the auxiliary air pipe, the auxiliary spray heads are uniformly distributed around the pulverized coal spray head, and the auxiliary air pipe is connected with the auxiliary spray heads in parallel.

2. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the gas in the first gas tank and the second gas tank is one of inert gas and compressed air.

3. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the number of the auxiliary spray heads is at least 4.

4. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: and each auxiliary spray head is provided with an adjusting valve.

5. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the gas direction sprayed by the auxiliary spray nozzle is consistent with the spraying direction of the pulverized coal spray nozzle.

6. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the distance between the auxiliary spray head and the pulverized coal spray head is 1-3 times of the caliber of the nozzle of the pulverized coal spray head.

7. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the aperture of the auxiliary nozzle is 1/2-2/3 of that of the pulverized coal nozzle, and the range extremum is included.

8. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the utility model discloses a coal smelting pot, including first gas tank department, second gas tank department, buggy jar, second gas tank department, first gas tank department is provided with first trachea and second trachea, the bottom of buggy jar is provided with the booster pipe, first trachea with the top of buggy jar links to each other, the second trachea with the booster pipe links to each other, the other end of booster pipe pass through the coal conveying pipe with intelligent V type governing valve links to each other, the other end of intelligent V type governing valve is provided with the coal injection pipe, the tip of coal injection pipe is provided with the mount pad, the buggy shower nozzle is all installed with auxiliary shower nozzle on the mount pad, the top of smelting pot is provided with the exhaust pipe.

9. An environment-friendly self-adaptive control method for uniform coal injection and blowing of a blast furnace, based on the self-adaptive control device of any one of claims 1-8, is characterized by comprising the following steps:

S1, setting an initial set value of the total flow of coal dust flowing out of an intelligent V-shaped regulating valve in unit time; the pulverized coal flow velocity at the output end of the intelligent V-shaped regulating valve is monitored in real time by using a pulverized coal flow velocity sensing detector and is recorded as K in cm/min;

S2, calculating the cross section area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and recording as S ₁, wherein the calculation expression is as follows:

；

Wherein S ₁ is the cross-sectional area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and the unit is: cm ²; d is the diameter of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm; pi is a mathematical constant;

S3, converting the angle into an arc system according to the opening angle of the V-shaped ball valve, so as to obtain the opening width of the intelligent V-shaped regulating valve in an incomplete opening state, wherein the calculation expression is as follows:

；/>；

Wherein N is the opening width of the intelligent V-shaped regulating valve in the incomplete opening state, and the unit is as follows: cm; beta is the actual opening angle of the intelligent V-shaped regulating valve, and the unit is: a degree; alpha is the opening angle of the V-shaped ball valve, and the unit is: a degree; pi is a mathematical constant; d is the diameter of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm;

S4, combining the opening condition of the intelligent V-shaped regulating valve in the actual condition and the length of the V-shaped ball valve of the intelligent V-shaped regulating valve, calculating the cross-sectional area of a pipeline when coal dust flows through the intelligent V-shaped regulating valve, and recording as S ₂, wherein the calculation expression is as follows:

；

Wherein S ₂ is the cross-sectional area of the pipeline in the incompletely opened state of the intelligent V-shaped regulating valve, and the unit is: cm ²; pi is a mathematical constant; n is the opening width of the intelligent V-shaped regulating valve in the incomplete opening state, and the unit is: cm; l is the length of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm;

S5, combining the values obtained in the steps S1, S2, S3 and S4, and calculating to obtain the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time, wherein the calculation expression is as follows:

；/>；

Wherein G ₁ is the total flow of pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; g ₂ is the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; k is the coal powder circulation speed obtained in the step S1, and the unit is: cm/min; ρ is the density of pulverized coal, and 800kg/m ³;S₁ is the cross-sectional area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and the unit is: cm ²;S₂ is the cross-sectional area of the pipeline in the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is: cm ²; t is the unit time, unit: min;

S6, according to the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time obtained in the step S5, calculating a pressure loss pressure drop value under the working state of the pulverized coal nozzle by combining the length and the radius of a pulverized coal nozzle pipeline and the pulverized coal flowing speed detected by the pulverized coal flow rate sensing detector, carrying out summation calculation on the loss pressure drop value and an initial jetting gas pressure value of the auxiliary nozzle, and changing the gas pressure value jetted by the auxiliary nozzle in real time, wherein the calculation expression is as follows:

；/>；/>；

in the method, in the process of the invention, Is a Reynolds number; ρ is the density of coal powder, and the value is 800kg/m ³; k is the flow velocity of coal powder in a coal powder spray nozzle pipeline, and the unit is: cm/min; d is the length of the pulverized coal nozzle pipeline, and the unit is: cm; mu is the viscosity coefficient of the pulverized coal, and a fixed value 15 is taken; /(I)The loss pressure drop value is the unit MPa of the loss pressure drop value under the working state of the pulverized coal nozzle; g _（1,2） is the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state or the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; r is the radius of the pulverized coal nozzle pipeline, and the unit is: cm; p is the pressure value of the sprayed gas of the auxiliary spray head, and the unit is: MPa; p ₀ is the initial jet gas pressure value of the auxiliary jet head, and the unit is: and (5) MPa.

10. The self-adaptive control method for uniform coal injection and blowing of the environment-friendly blast furnace according to claim 9, which is characterized in that: and 3, the opening angle of the V-shaped ball valve in the step S3 is 30-90 degrees.