阅读说明：本技术 一种干熄焦炉紧急充氮系统及控制方法 (Emergency nitrogen charging system for dry quenching furnace and control method ) 是由 王付强 张春峰 王建中 于 2021-08-05 设计创作，主要内容包括：本发明公开了一种干熄焦炉紧急充氮系统及控制方法,属于干熄焦炉气体检测领域；包括干熄焦炉、气体循环检测装置、氮气供应装置和干熄焦控制站DCS；控制方法包括以下步骤：判断可燃气体浓度是否超标；超标的情况下,根据气体温度控制空气调节阀开度；判断超标等级,启动紧急充氮系统；判断是否启动紧急排查程序；不超标的情况下,判断浓度的变化速度；浓度快速增长的情况下,启动紧急充氮系统；浓度变化速度平稳的情况下,关闭氮气调节阀；判断氮气缓冲罐氮气压力,调节管网氮气调节阀和备用氮气调节阀开度,保证事故氮气的充足供给。本发明实现可燃气体浓度上升期提前充入氮气预防浓度超标,超标后分等级自动对干熄焦炉进行充氮调节。(The invention discloses an emergency nitrogen charging system of a coke dry quenching furnace and a control method, belonging to the field of gas detection of coke dry quenching furnaces; the system comprises a dry quenching furnace, a gas circulation detection device, a nitrogen supply device and a dry quenching control station DCS; the control method comprises the following steps: judging whether the concentration of the combustible gas exceeds the standard or not; under the condition of exceeding the standard, controlling the opening of the air regulating valve according to the gas temperature; judging the standard exceeding grade, and starting an emergency nitrogen charging system; judging whether an emergency investigation program is started; judging the change speed of the concentration under the condition of not exceeding the standard; starting an emergency nitrogen charging system under the condition of rapid increase of concentration; under the condition that the concentration change speed is stable, closing the nitrogen regulating valve; and the nitrogen pressure of the nitrogen buffer tank is judged, and the opening degree of a pipe network nitrogen regulating valve and a standby nitrogen regulating valve is regulated to ensure sufficient supply of accident nitrogen. The invention realizes that the concentration of the combustible gas is prevented from exceeding the standard by charging nitrogen in advance in the rising period of the concentration, and the dry quenching furnace is automatically regulated by charging nitrogen in a grading manner after exceeding the standard.)

1. An emergency nitrogen charging system for a dry quenching furnace is characterized in that: the system comprises a dry quenching furnace (1) for cooling red coke and heating circulating gas, a gas circulation detection device for ensuring the safe circulation of the gas, a nitrogen supply device for reducing the concentration of combustible gas and a dry quenching control station DCS (13) for acquiring data in real time and controlling the operation of the system;

the gas circulation detection device comprises an air regulating valve (4) for controlling the amount of air introduced into the dry quenching furnace (1), a circulating gas collecting pipe (2) for collecting circulating gas and conveying the circulating gas to the inlet of the waste heat boiler, a gas analyzer (3) and a gas temperature sensor (5) which are respectively arranged at the inlet of the circulating gas collecting pipe (2);

the nitrogen supply device comprises a nitrogen buffer tank (7) provided with a nitrogen pressure sensor (12), a pipe network nitrogen regulating valve (8) for controlling an oxygen generation station (10) to convey nitrogen flow to the nitrogen buffer tank (7), a standby nitrogen regulating valve (9) for controlling standby liquid nitrogen (11) to convey nitrogen flow to the nitrogen buffer tank (7), and an accident nitrogen regulating valve (6) for controlling the nitrogen buffer tank (7) to convey nitrogen flow to the dry quenching furnace (1);

the dry quenching control station DCS (13) collects data of the gas analyzer (3), the gas temperature sensor (5) and the nitrogen pressure sensor (12) and controls the opening degrees of the air regulating valve (4), the accident nitrogen regulating valve (6), the pipe network nitrogen regulating valve (8) and the standby nitrogen regulating valve (9).

2. The dry quenching furnace emergency nitrogen charging system of claim 1, wherein: a primary dust removal device (2-1) is arranged at the inlet of the circulating gas collecting pipe (2); the gas analyzer (3) and the gas temperature sensor (5) are both arranged behind the primary dust removal device (2-1).

3. The dry quenching furnace emergency nitrogen charging system of claim 1, wherein: the gas analyzer (3) bagH sequentially installed from bottom to top₂A content detector (3-1), a CO content detector (3-2) and O₂A content detector (3-3).

4. A method of controlling the use of the dry quenching furnace emergency nitrogen dosing system of any of claims 1-3, characterized by: the method comprises the following steps:

s1, judging H in the circulating gas₂、CO、O₂Whether the concentration exceeds the standard or not;

h in S2 and S1₂Under the condition that the CO concentration exceeds the standard, the temperature of the circulating gas is judged, and the opening of an air adjusting valve (4) is controlled;

s3, judgment of H in S2₂CO and O in S1₂Starting an emergency nitrogen charging system of the dry quenching furnace when the concentration exceeds the standard level;

s4, collecting O in S3₂Judging whether an emergency investigation program is started or not according to the concentration overproof duration time;

h in S5 and S1₂、CO、O₂Under the condition that the concentration does not exceed the standard, H is judged₂、CO、O₂The rate of change of concentration;

h in S6 and S5₂、CO、O₂Under the condition that the concentration is rapidly increased, starting an emergency nitrogen charging system of the dry quenching furnace, and opening an accident nitrogen regulating valve (6) to 40%;

h in S7 and S5₂、CO、O₂Under the condition that the concentration change speed is stable, the nitrogen regulating valve (6) is closed;

s8, judging the nitrogen pressure of the nitrogen buffer tank (7), adjusting the opening degrees of the pipe network nitrogen adjusting valve (8) and the standby nitrogen adjusting valve (9), and ensuring sufficient supply of accident nitrogen.

5. The control method of the dry quenching furnace emergency nitrogen charging system as claimed in claim 4, characterized in that: in S1, H in the circulating gas is judged₂、CO、O₂Whether the concentration exceeds the standard or not specifically comprises the following steps:

s1.1 Dry quenching control station DCS (13) collects H₂The data of the content detector (3-1) is judged and measuredH of (A) to (B)₂Whether the percentage C1 is greater than 2%, and if so, proceed directly to S2;

s1.2, collecting data of a CO content detector (3-2) by a dry quenching control station DCS (13), judging whether the measured CO percentage C2 is more than 6%, and if so, directly carrying out S2;

s1.3 Dry quenching control station DCS (13) acquisition O₂The data of the content detector (3-3) is used for judging the measured O₂Whether the percentage C3 is greater than 0.75%, if so, proceed to S3, and if not, proceed to S5.

6. The control method of the dry quenching furnace emergency nitrogen charging system as claimed in claim 4, characterized in that: in the step S2, the temperature of the circulating gas is judged, and the opening of the air adjusting valve (4) is controlled, and the method specifically comprises the following steps:

s2.1, collecting the temperature T of a gas temperature sensor (5) by a dry quenching control station DCS (13);

s2.2, when the temperature T of the circulating gas is higher than 600 ℃, the air regulating valve (4) is opened to the maximum;

s2.3, when the temperature T of the circulating gas is less than 600 ℃, the air regulating valve (4) is closed.

7. The control method of the dry quenching furnace emergency nitrogen charging system as claimed in claim 4, characterized in that: in the step S3, the temperature of the circulating gas is judged, and the opening of the air adjusting valve (4) is controlled, and the method specifically comprises the following steps:

s3.1 Dry quenching control station DCS (13) judges H₂Whether the percentage C1 is greater than 6%, if so, opening the accident nitrogen adjusting valve (6) to the maximum and carrying out S8;

s3.2, judging whether the CO percentage C2 is more than 8% by the DCS (13) of the dry quenching control station, if so, opening the accident nitrogen regulating valve (6) to the maximum, and carrying out S8;

s3.3 Dry quenching control station DCS (13) judging O₂Whether the percentage C3 is greater than 1%, if so, opening the accident nitrogen adjusting valve (6) to the maximum, and carrying out S4 and S8;

s3.4 if C1 is less than 6%, C2 is less than 8%, C3 is less than 1%, the accident nitrogen adjustment valve (6) is opened to 70%, and S8 is performed.

8. The control method of the dry quenching furnace emergency nitrogen charging system as claimed in claim 4, characterized in that: in S4, collecting O₂Judging whether to start an emergency investigation program or not according to the concentration overproof duration, and specifically comprising the following steps of:

s4.1, starting a DCS (13) timer of a dry quenching control station;

s4.2 determination of O₂Whether the percentage C3 is less than 1%, and if so, clearing the timer;

and S4.3, timing by a timer to a set value for 5 minutes, alarming, starting an emergency investigation program, and investigating whether the negative pressure section leaks.

9. The control method of the dry quenching furnace emergency nitrogen charging system as claimed in claim 4, characterized in that: at S5, H is judged₂、CO、O₂The change speed of the concentration specifically comprises the following steps:

s5.1 Dry quenching control station DCS (13) H₂Whether the percentage increase speed S1 is greater than 0.5%/min or not, and if so, directly carrying out S6;

s5.2, judging whether the CO percentage increase speed S2 of the dry quenching control station DCS (13) is more than 1%/min or not, and if so, directly carrying out S6;

s5.3 Dry quenching control station DCS (13) O₂Whether the percentage increase speed S1 is greater than 1%/min, if so, proceed directly to S7.

10. The control method of the dry quenching furnace emergency nitrogen charging system as claimed in claim 2, characterized in that: in S8, judging the nitrogen pressure of the nitrogen buffer tank (7), and adjusting the opening degrees of the pipe network nitrogen adjusting valve (8) and the standby nitrogen adjusting valve (9), the method specifically comprises the following steps:

s8.1, collecting data of a nitrogen pressure sensor (12) by a DCS (13) of a dry quenching control station to obtain nitrogen pressure P of a nitrogen buffer tank (7);

s8.2, when the nitrogen pressure P is greater than 0.7MPa, opening the pipe network nitrogen regulating valve (8) to 60%;

s8.3, when the nitrogen pressure P is 0.5-0.7 MPa, opening a pipe network nitrogen regulating valve (8) to the maximum;

s8.4, when the nitrogen pressure P is less than 0.5MPa, opening the pipe network nitrogen regulating valve (8) and the standby nitrogen regulating valve (9) to the maximum.

Technical Field

The invention relates to the field of gas detection of a dry quenching furnace, in particular to an emergency nitrogen charging system of the dry quenching furnace and a control method.

Background

And (3) carrying out countercurrent heat exchange on the inert circulating gas and coke in a cooling section of the dry quenching furnace, heating to 900-960 ℃, and then feeding into a dry quenching boiler. Due to the gas circulation systemA small amount of air, O, can leak into the negative pressure section₂Will react with coke to generate CO through the red coke layer₂，CO₂The CO is reduced to CO in a high-temperature area of a coke layer, and the CO concentration in the circulating gas is higher and higher along with the increase of the circulating times. In addition, the residual volatile matter in the coke is precipitated, and H generated by coke pyrolysis₂CO, etc. are also flammable and explosive components, so in dry quenching operation, the concentration of flammable components in the recycle gas is controlled below the explosive limit. Generally, two measures can be used for control, one is to continuously supplement a proper amount of industrial nitrogen into a gas circulation system, dilute combustible components in the circulating gas and then disperse a corresponding amount of circulating gas; and the other method is to continuously introduce a proper amount of air into the circulating gas led out after the temperature is raised to 900-960 ℃ to burn the growing combustible components, and then to disperse the corresponding amount of circulating gas after the circulating gas is cooled by a boiler. However, both of these measures require manual adjustment of the valve according to the gas concentration, and both of these measures are adjusted after the concentration of the combustible gas is abnormal, which is dangerous to some extent.

In order to solve the problems, the development of an emergency nitrogen charging system and a control method for the dry quenching furnace is needed.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an emergency nitrogen charging system and a control method for a dry quenching furnace, so that the nitrogen is charged in advance in the rising period of the combustible gas concentration to prevent the combustible gas concentration from exceeding the standard, and the dry quenching furnace is automatically subjected to nitrogen charging adjustment in a graded manner after the combustible gas concentration exceeds the standard.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

an emergency nitrogen charging system of a coke dry quenching furnace comprises the coke dry quenching furnace, a gas circulation detection device, a nitrogen supply device and a coke dry quenching control station DCS, wherein the coke dry quenching furnace is used for cooling red coke and heating circulating gas, the gas circulation detection device ensures the safe circulation of the gas, the nitrogen supply device reduces the concentration of combustible gas, and the coke dry quenching control station DCS is used for acquiring data in real time and controlling the operation of the system;

the gas circulation detection device comprises an air regulating valve for controlling the amount of introduced air of the dry quenching furnace, a circulating gas collecting pipe for collecting circulating gas and conveying the circulating gas to the inlet of the waste heat boiler, a gas analyzer and a gas temperature sensor which are respectively arranged at the inlet of the circulating gas collecting pipe;

the nitrogen supply device comprises a nitrogen buffer tank provided with a nitrogen pressure sensor, a pipe network nitrogen regulating valve for controlling the oxygen generation station to convey the nitrogen flow to the nitrogen buffer tank, a standby nitrogen regulating valve for controlling standby liquid nitrogen to convey the nitrogen flow to the nitrogen buffer tank, and an accident nitrogen regulating valve for controlling the nitrogen buffer tank to convey the nitrogen flow to the dry quenching furnace;

the DCS collects data of a gas analyzer, a gas temperature sensor and a nitrogen pressure sensor and controls the opening of an air regulating valve, an accident nitrogen regulating valve, a pipe network nitrogen regulating valve and a standby nitrogen regulating valve.

The technical scheme of the invention is further improved as follows: a primary dust removal device is arranged at the inlet of the circulating gas collecting pipe; the gas analyzer and the gas temperature sensor are both arranged behind the primary dust removal device.

The technical scheme of the invention is further improved as follows: the gas analyzer comprises H which are sequentially arranged from bottom to top₂Content detector, CO content detector and O₂A content detector.

A control method of an emergency nitrogen charging system of a dry quenching furnace comprises the following steps:

s1, judging H in the circulating gas₂、CO、O₂Whether the concentration exceeds the standard or not;

h in S2 and S1₂Judging the temperature of the circulating gas and controlling the opening of an air adjusting valve under the condition that the concentration of CO exceeds the standard;

s3, judgment of H in S2₂CO and O in S1₂Starting an emergency nitrogen charging system of the dry quenching furnace when the concentration exceeds the standard level;

s4, collecting O in S3₂Judging whether an emergency investigation program is started or not according to the concentration overproof duration time;

h in S5 and S1₂、CO、O₂Under the condition that the concentration does not exceed the standard, H is judged₂、CO、O₂The rate of change of concentration;

h in S6 and S5₂、CO、O₂In case of rapid concentration increase, dry startOpening an accident nitrogen regulating valve to 40% by using an emergency nitrogen filling system of the coke quenching furnace;

h in S7 and S5₂、CO、O₂Under the condition that the concentration change speed is stable, closing the nitrogen regulating valve;

s8, judging the nitrogen pressure of the nitrogen buffer tank, adjusting the opening of the pipe network nitrogen adjusting valve and the standby nitrogen adjusting valve, and ensuring sufficient supply of accident nitrogen.

The technical scheme of the invention is further improved as follows: in S1, H in the circulating gas is judged₂、CO、O₂Whether the concentration exceeds the standard or not specifically comprises the following steps:

s1.1 Dry quenching control station DCS acquisition H₂Content detector data, determining measured H₂Whether the percentage C1 is greater than 2%, and if so, proceed directly to S2;

s1.2, collecting CO content detector data by a dry quenching control station DCS, judging whether the measured CO percentage C2 is more than 6%, and if so, directly carrying out S2;

s1.3 Dry quenching control station DCS acquisition O₂The data of the content detector is used for judging the measured O₂Whether the percentage C3 is greater than 0.75%, if so, proceed to S3, and if not, proceed to S5.

The technical scheme of the invention is further improved as follows: in S2, determining the temperature of the circulating gas and controlling the opening of the air regulating valve, specifically comprising the steps of:

s2.1, collecting the temperature T of a gas temperature sensor by a dry quenching control station DCS;

s2.2, when the temperature T of the circulating gas is higher than 600 ℃, the air regulating valve is opened to the maximum;

s2.3 when the temperature T of the circulating gas is less than 600 ℃, the air regulating valve is closed.

The technical scheme of the invention is further improved as follows: in S3, determining the temperature of the circulating gas and controlling the opening of the air regulating valve, specifically comprising the steps of:

s3.1 Dry quenching control station DCS judges H₂Whether the percentage C1 is greater than 6%, if so, opening the accident nitrogen adjusting valve to the maximum, and carrying out S8;

s3.2, judging whether the CO percentage C2 is more than 8% by the DCS, if so, opening the accident nitrogen regulating valve to the maximum, and carrying out S8;

s3.3 Dry quenching control station DCS judges O₂Whether the percentage C3 is greater than 1%, if so, opening the accident nitrogen adjusting valve to the maximum, and carrying out S4 and S8;

s3.4 if C1 is less than 6%, C2 is less than 8%, C3 is less than 1%, open the incident nitrogen adjustment valve to 70%, and proceed to S8.

The technical scheme of the invention is further improved as follows: in S4, collecting O₂Judging whether to start an emergency investigation program or not according to the concentration overproof duration, and specifically comprising the following steps of:

s4.1, starting a DCS timer of a dry quenching control station;

s4.2 determination of O₂Whether the percentage C3 is less than 1%, and if so, clearing the timer;

and S4.3, timing by a timer to a set value for 5 minutes, alarming, starting an emergency investigation program, and investigating whether the negative pressure section leaks.

The technical scheme of the invention is further improved as follows: at S5, H is judged₂、CO、O₂The change speed of the concentration specifically comprises the following steps:

s5.1 Dry quenching control station DCS H₂Whether the percentage increase speed S1 is greater than 0.5%/min or not, and if so, directly carrying out S6;

s5.2, judging whether the DCS CO percentage increase speed S2 of the dry quenching control station is more than 1%/min or not, and if so, directly carrying out S6;

s5.3 Dry quenching control station DCS O₂Whether the percentage increase speed S1 is greater than 1%/min, if so, proceed directly to S7.

The technical scheme of the invention is further improved as follows: in S8, judging the nitrogen pressure of the nitrogen buffer tank, and adjusting the opening of the pipe network nitrogen adjusting valve and the standby nitrogen adjusting valve, the method specifically comprises the following steps:

s8.1, collecting data of a nitrogen pressure sensor by a dry quenching control station DCS to obtain nitrogen pressure P of a nitrogen buffer tank;

s8.2, when the nitrogen pressure P is greater than 0.7MPa, opening the nitrogen regulating valve of the pipe network to 60%;

s8.3, when the nitrogen pressure P is 0.5-0.7 MPa, opening the nitrogen regulating valve of the pipe network to the maximum;

and S8.4, when the nitrogen pressure P is less than 0.5MPa, opening the pipe network nitrogen regulating valve and the standby nitrogen regulating valve to the maximum.

Due to the adoption of the technical scheme, the invention has the technical progress that:

1. according to the invention, the automatic control of the emergency nitrogen charging system is realized by collecting data through the DCS and controlling the opening of the regulating valve.

2. According to the invention, the nitrogen is filled in advance in the combustible gas concentration rising period to prevent the combustible gas concentration from exceeding the standard, so that the safety of the dry quenching production process is improved.

3. The method realizes reasonable allocation of nitrogen charging flow by grading the concentration exceeding of the combustible gas and controlling different valve openings under different grades.

4. The invention passes the pair H according to the difference of gas density₂Content detector, CO content detector and O₂The content detector is sequentially arranged from bottom to top, so that the measurement H is ensured₂CO and O₂The accuracy of the method.

5. According to the invention, the gas analyzer and the gas temperature sensor are arranged on the primary dust removal device, so that the service lives of the gas analyzer and the gas temperature sensor are prolonged.

6. The nitrogen buffer tank is arranged, so that the stability of the nitrogen pressure in the pipe network is realized; by arranging the nitrogen pressure sensor, sufficient nitrogen is provided in the emergency nitrogen filling process, and the reliability of the nitrogen filling system is improved.

Drawings

FIG. 1 is a flow chart of a control method of the present invention;

FIG. 2 is a schematic diagram of the system architecture of the present invention;

FIG. 3 is a schematic view showing the internal structure of the circulating gas header of the present invention;

wherein, 1, dry quenching furnace, 2, circulating gas collecting pipe, 2-1, primary dust removing device, 3, gas analyzer, 3-1, H₂Content detector, 3-2, CO content detector, 3-3, O₂A content detector is arranged on the device for detecting the content,4. air control valve, 5, gas temperature sensor, 6, accident nitrogen control valve, 7, nitrogen buffer tank, 8, pipe network nitrogen control valve, 9, reserve nitrogen control valve, 10, oxygen generation station, 11, reserve liquid nitrogen, 12, nitrogen pressure sensor, 13, dry quenching control station DCS.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

an emergency nitrogen charging system of a coke dry quenching furnace comprises a coke dry quenching furnace 1 for cooling red coke and heating circulating gas, a gas circulation detection device for ensuring the safe circulation of the gas, a nitrogen supply device for reducing the concentration of combustible gas and a coke dry quenching control station DCS13 for acquiring data in real time and controlling the operation of the system;

as shown in fig. 2, the gas circulation detection device includes an air regulating valve 4 for controlling the amount of air introduced into the dry quenching furnace 1, a circulating gas header 2 for collecting the circulating gas and sending the circulating gas to the inlet of the waste heat boiler, a gas analyzer 3 and a gas temperature sensor 5 respectively installed at the inlet of the circulating gas header 2.

The nitrogen supply device comprises a nitrogen buffer tank 7 provided with a nitrogen pressure sensor 12, a pipe network nitrogen regulating valve 8 for controlling the oxygen generation station 10 to convey the nitrogen flow to the nitrogen buffer tank 7, a standby nitrogen regulating valve 9 for controlling standby liquid nitrogen 11 to convey the nitrogen flow to the nitrogen buffer tank 7, and an accident nitrogen regulating valve 6 for controlling the nitrogen buffer tank 7 to convey the nitrogen flow to the dry quenching furnace 1; the nitrogen buffer tank is arranged to realize the stability of the nitrogen pressure in the pipe network; by arranging the nitrogen pressure sensor, sufficient nitrogen is provided in the emergency nitrogen filling process, and the reliability of the nitrogen filling system is improved.

The dry quenching control station DCS13 collects data of the gas analyzer 3, the gas temperature sensor 5 and the nitrogen pressure sensor 12, and controls the opening degrees of the air regulating valve 4, the accident nitrogen regulating valve 6, the pipe network nitrogen regulating valve 8 and the standby nitrogen regulating valve 9.

As shown in fig. 3, a primary dust removing device 2-1 is arranged at the inlet of the circulating gas collecting pipe 2; the gas analyzer 3 and the gas temperature sensor 5 are both arranged behind the primary dust removal device 2-1; the circulating gas enters the gas analyzer 3 and the gas temperature sensor 5 after most dust is filtered by the primary dust removal device 2-1, so that the service life of the gas analyzer 3 and the gas temperature sensor 5 is prolonged.

The gas analyzer 3 comprises H sequentially arranged from bottom to top₂Content detector 3-1, CO content detector 3-2 and O₂3-3 of a content detector; according to different gas densities, the pair H₂Content detector 3-1, CO content detector 3-2 and O₂The content detectors 3-3 are sequentially arranged from bottom to top, so that the measurement H is ensured₂CO and O₂The accuracy of the method.

As shown in FIG. 1, a control method of an emergency nitrogen charging system of a dry quenching furnace comprises the following steps:

s1, judging H in the circulating gas₂、CO、O₂Whether the concentration exceeds the standard or not:

s1.1 Dry quenching control station DCS13 acquisition H₂The content detector 3-1 judges the measured H₂Whether the percentage C1 is more than 2% or not, if so, judging that the percentage exceeds the standard, and directly carrying out S2;

s1.2, collecting 3-2 data of a CO content detector by a dry quenching control station DCS13, judging whether the measured CO percentage C2 is more than 6%, if so, judging that the CO percentage exceeds the standard, and directly carrying out S2;

s1.3 Dry quenching control station DCS13 acquisition O₂The content detector 3-3 judges the measured O₂And whether the percentage C3 is greater than 0.75% or not, if so, judging that the percentage exceeds the standard, and performing S3, and if not, performing S5.

H in S2 and S1₂And under the condition that the CO concentration exceeds the standard, judging the temperature of the circulating gas, and controlling the opening degree of an air adjusting valve 4:

s2.1, collecting the temperature T of a gas temperature sensor 5 by a dry quenching control station DCS 13;

s2.2 when the temperature T of the circulating gas is more than 600 ℃, the DCS13 of the dry quenching control station controls the air regulating valve 4 to be opened to the maximum, and air is introduced to reduce H₂、CO、O₂Concentration;

s2.3, when the temperature T of the circulating gas is less than 600 ℃, the dry quenching control station DCS13 controls the air regulating valve 4 to be closed, and air is prevented from entering the dry quenching furnace to explode.

S3, judgment of H in S2₂CO and O in S1₂And (3) starting an emergency nitrogen charging system of the dry quenching furnace when the concentration exceeds the standard level:

s3.1 Dry quenching control station DCS13 judges H₂Whether the percentage C1 is more than 6% or not, if so, the first grade exceeds the standard, the dry quenching control station DCS13 controls the accident nitrogen adjusting valve 6 to be opened to the maximum, and the first-grade emergency nitrogen filling is started;

s3.2, judging whether the CO percentage C2 is more than 8% by the dry quenching control station DCS13, if so, exceeding the first grade, controlling the accident nitrogen adjusting valve 6 to be opened to the maximum by the dry quenching control station DCS13, and starting the first-grade emergency nitrogen filling;

s3.3 Dry quenching control station DCS13 judging O₂Whether the percentage C3 is more than 1% or not, if so, the first grade exceeds the standard, the dry quenching control station DCS13 controls the accident nitrogen adjusting valve 6 to be opened to the maximum, and the first-grade emergency nitrogen filling is started;

s3.4, if the C1 is less than 6%, the C2 is less than 8% and the C3 is less than 1%, the second grade exceeds the standard, the dry quenching control station DCS13 controls the accident nitrogen adjusting valve 6 to be opened to 70%, and the second grade emergency nitrogen filling is started.

S4, collecting O in S3₂And (3) judging whether an emergency investigation program is started or not according to the concentration overproof duration time:

s4.1, starting a DCS13 timer of a dry quenching control station;

s4.2 determination of O₂Whether the percentage C3 is less than 1%, and if so, clearing the timer;

and S4.3, timing by a timer to a set value for 5 minutes, giving an alarm by a DCS13 control station, starting an emergency investigation program, and investigating whether the negative pressure section leaks.

H in S5 and S1₂、CO、O₂Under the condition that the concentration does not exceed the standard, H is judged₂、CO、O₂Rate of change of concentration:

s5.1 Dry quenching control station DCS13H₂Whether the percentage increase speed S1 is greater than 0.5%/min or not, if so, in a concentration rise period, and directly performing S6;

s5.2, judging whether the percentage increase speed S2 of the dry quenching control station DCS13CO is more than 1%/min or not, if so, in a concentration rise period, and directly carrying out S6;

s5.3 Dry quenching control station DCS13O₂Whether the percentage increase rate S1 is greater than 1%/min, if so, in the concentration plateau, and directly proceeds to S7.

H in S6 and S5₂、CO、O₂Under the condition that the concentration is rapidly increased, an emergency nitrogen charging system of the dry quenching furnace is started, the emergency nitrogen adjusting valve 6 is opened to 40 percent, nitrogen is charged in advance in the rising period of the concentration of combustible gas to prevent the concentration of the combustible gas from exceeding the standard, and the safety of the production process of the dry quenching furnace is improved.

H in S7 and S5₂、CO、O₂Under the condition of stable concentration change speed, the dry quenching control station DCS13 closes the nitrogen regulating valve 6.

S8, judging the nitrogen pressure of the nitrogen buffer tank 7, and adjusting the opening degrees of a pipe network nitrogen adjusting valve 8 and a standby nitrogen adjusting valve 9 by a dry quenching control station DCS13 to ensure the sufficient supply of accident nitrogen:

s8.1, collecting data of a nitrogen pressure sensor 12 by a dry quenching control station DCS13 to obtain the nitrogen pressure P of a nitrogen buffer tank 7;

s8.2, when the nitrogen pressure P is greater than 0.7MPa, the dry quenching control station DCS13 opens the pipe network nitrogen regulating valve 8 to 60%;

s8.3, when the nitrogen pressure P is 0.5-0.7 MPa, the dry quenching control station DCS13 opens the pipe network nitrogen regulating valve 8 to the maximum;

s8.4, when the nitrogen pressure P is less than 0.5MPa, the dry quenching control station DCS13 opens the pipe network nitrogen regulating valve 8 and the standby nitrogen regulating valve 9 to the maximum.

In summary, the present invention is based on the fact that the H content in the circulating gas measured by a gas analyzer mounted on the circulating gas header₂、CO、O₂The concentration of the coke dry quenching furnace is fed back and adjusted, when the gas concentration continuously rises, nitrogen is filled in advance to prevent the concentration of combustible gas from exceeding the standard, and the coke dry quenching furnace is automatically adjusted by filling nitrogen in a grading manner after the concentration of the combustible gas exceeds the standard; the data are collected by a DCS (distributed control System) of a dry quenching control station, and the opening of a regulating valve is controlled, so that the automatic control of an emergency nitrogen charging system is realized; the nitrogen charging flow is realized by grading the concentration of combustible gas to exceed the standard and controlling the different opening degrees of the valves under different gradesAnd (4) reasonably blending.