Method and system for converting coke oven chimney from cold state to hot state

Abstract

The invention relates to a method and system for converting a coke oven chimney from a cold state to a hot state, a flame generator is arranged in the coke oven chimney, the flame generator is connected with a fuel gas source through a fuel gas pipeline, and a fuel gas valve is arranged on the fuel gas pipeline; when equipment for providing power for coke oven flue gas emission breaks down and coke oven flue gas needs to be exhausted by means of gravitation of the coke oven chimney, the flame generating device is started, so that the coke oven chimney is rapidly converted from a cold state to a hot state, and hot airflow upward from the root is formed in the coke oven chimney; and high-temperature coke oven flue gas from a coke oven main flue is guided to continuously upwards and is discharged through a coke oven chimney, so that the pressure difference required by normal production of the coke oven is formed. According to the invention, on the premise that the coke oven chimney does not need to be subjected to hot standby by continuously consuming energy, the coke oven chimney can be quickly converted from a cold state to a hot state, so that the realization of extreme recovery of coke oven flue gas waste heat is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of coke oven coking, and particularly to a method and system for converting a coke oven chimney from a cold state to a hot state. Background Art

[0002] Coke oven flue gas is the waste flue gas generated after fuel combustion in the coke oven production process. The coke oven flue gas contains certain amounts of atmospheric pollutants such as NO x , SO2, etc., and greenhouse gas CO2, and at the same time carries waste heat accounting for about 17% of the total heat output of the coke oven. With the improvement of environmental protection requirements, the treatment of atmospheric pollutants such as NO x , SO2, etc. in the coke oven flue gas, as well as the capture and resource utilization of CO2 in the coke oven flue gas, have become an indispensable part of the green and low-carbon development of the coking industry. And the full and effective recovery of the waste heat carried by the coke oven flue gas is also an inevitable requirement for realizing extremely efficient coking.

[0003] In the existing coke oven flue gas desulfurization and denitrification technologies, the coke oven flue gas at a temperature of 180°C to 300°C is sent to the coke oven chimney for emission by the fan of the desulfurization and denitrification system after desulfurization and denitrification. The pressure required by the coke oven heating system during normal coke oven production is provided by the fan of the desulfurization and denitrification system. To ensure the normal production of the coke oven in case of sudden failure of the desulfurization and denitrification system, it is required to take heat standby measures for the coke oven chimney to maintain the temperature of the gas flowing in the coke oven chimney at 100°C to 130°C or higher. For this purpose, certain technical means are needed to make the gas at a temperature of 100°C to 130°C or higher continuously pass through the coke oven chimney for emission, so that the coke oven chimney is always in a heat standby state. For example:

[0004] The Chinese utility model patent with the application number CN201520394546.X discloses "a coke oven flue gas heat standby system", and the Chinese utility model patent with the application number CN202320079753.0 discloses "a system for desulfurization, denitrification and waste heat utilization of low-temperature coke oven flue gas", both of which use a heat exchanger to exchange heat between air and the coke oven flue gas after denitrification and waste heat recovery, and then send the heated air into the coke oven chimney to solve the heat standby problem of the coke oven chimney.

[0005] The Chinese invention patent with the application number CN201610295380.5 discloses a "desulfurization and denitrification method and device for heat standby of a coke oven chimney using coke oven flue gas", which uses the coke oven flue gas at 160°C to 180°C discharged from the waste heat boiler to heat the coke oven flue gas at 60°C to 80°C discharged from the desulfurization and denitrification absorption tower to 120°C to 130°C in a heat standby heat exchanger and then sends it into the coke oven chimney to solve the heat standby problem of the chimney.

[0006] The Chinese utility model patent with the application number CN201620479180.0 discloses "A hot standby system for coke oven chimney applicable to wet flue gas desulfurization and denitrification process". Through the gas-gas heat exchanger, the sensible heat of the high-temperature coke oven flue gas before desulfurization and denitrification is used to heat the clean coke oven flue gas after desulfurization and denitrification, and then the heated clean coke oven flue gas is sent into the coke oven chimney to realize the hot standby of the coke oven chimney.

[0007] The Chinese utility model patent with the application number CN201620753101.0 discloses "A system for low-temperature denitrification, wet flue gas desulfurization and dust removal and ensuring the hot standby of the chimney". Through the air heat exchanger, the sensible heat of the coke oven flue gas after denitrification is used to heat a certain amount of air, and then the heated air is sent into the coke oven chimney for the hot standby of the coke oven chimney.

[0008] The Chinese utility model patent with the application number CN201621451587.9 discloses "A device for hot standby of coke oven chimney". Through the air heat exchanger, the sensible heat of the high-temperature coke oven flue gas before desulfurization is used to heat a certain amount of air, and then the heated air is sent into the coke oven chimney for the hot standby of the coke oven chimney.

[0009] The Chinese utility model patent with the application number CN201820466613.8 discloses a "Power-free hot standby system for coke oven chimney". An air inlet is opened at the root of the coke oven chimney, and steam is used to heat the air entering the coke oven chimney from the root of the coke oven chimney. The heated air is discharged through the coke oven chimney, so that the coke oven chimney is always in a hot standby state.

[0010] In the above-mentioned published literatures, whether the flue gas after desulfurization and denitrification is heated to 100°C - 130°C or higher, or the air is heated to 100°C - 130°C or higher, it is necessary to set up necessary heat exchange equipment, and at the same time, a large amount of heat needs to be exchanged or provided additionally from the coke oven flue gas to achieve this. The flue gas or air discharged from the coke oven chimney carries a large amount of waste heat and is discharged, resulting in insufficient recovery and utilization of energy.

[0011] The Chinese utility model patent with the application number CN201621151226.2 discloses "An integrated energy-saving purification system for desulfurization and denitrification of coke oven flue gas". A coaxial internal combustion engine is set for the coke oven flue gas induced draft fan. When an emergency power failure or a fault trip occurs, the coaxial internal combustion engine is used to replace the motor driving the induced draft fan to ensure the normal operation of the desulfurization and denitrification system, and at the same time, it also avoids the decrease in flue gas pressure caused by power failure. By using this method, the long-term hot standby of the coke oven chimney can be cancelled. However, when the entire coke oven flue gas desulfurization and denitrification system stops working due to a fault other than the induced draft fan motor of the coke oven flue gas desulfurization and denitrification system, the coaxial internal combustion engine cannot ensure the pressure required for the normal operation of the coke oven heating system by driving the induced draft fan, and the reliability is not high. Summary of the Invention

[0012] The present invention provides a method and system for converting a coke oven chimney from a cold state to a hot state. Without the need to continuously consume energy for hot standby of the coke oven chimney, the coke oven chimney can be quickly converted from a cold state to a hot state, which is beneficial to achieving the ultimate recovery of the waste heat of the coke oven flue gas. When the equipment that provides power for the flue gas discharge in the coke oven production system fails, the coke oven chimney can be quickly converted to a hot state and quickly restored to the normal production state, ensuring the stable operation of the coke oven production.

[0013] To achieve the above object, the present invention is implemented by the following technical solutions:

[0014] A method for converting a coke oven chimney from a cold state to a hot state, in which a flame generator is arranged in the coke oven chimney. The flame generator is connected to a gas source through a gas pipeline, and a gas valve is arranged on the gas pipeline. When the equipment that provides power for the coke oven flue gas discharge fails and the coke oven flue gas needs to be discharged by the gravitational force of the coke oven chimney, the flame generator is turned on, so that the coke oven chimney is quickly converted from a cold state to a hot state, and a hot air flow from the root upwards is formed in the coke oven chimney, guiding the high-temperature coke oven flue gas from the main flue of the coke oven to continuously flow upwards and be discharged through the coke oven chimney, forming the pressure difference required for the normal production of the coke oven.

[0015] A method for converting a coke oven chimney from a cold state to a hot state, and the specific process is as follows:

[0016] S1. When the equipment that provides the required power for the normal production of the coke oven is stopped or interrupted due to a sudden failure, the coke oven chimney in the cold state is quickly put into use; while the main flue damper is opened, the gas valve arranged on the gas pipeline is opened;

[0017] S2. The combustible gas stored in the gas source enters the flame generator along the gas pipeline and undergoes a combustion reaction in the coke oven chimney; the hot air flow generated by the combustion flows upwards from the root of the coke oven chimney, driving the cold air in the coke oven chimney to flow upwards and be discharged from the top of the coke oven chimney;

[0018] S3. The high-temperature coke oven flue gas from the main flue of the coke oven flows from the root to the top outlet of the coke oven chimney under the entrainment effect of the hot air flow generated in the coke oven chimney and the thermal buoyancy effect of the flue gas itself;

[0019] S4. The flow of the high-temperature coke oven flue gas in the coke oven chimney generates a pressure difference inside and outside the coke oven chimney, promoting the formation of a stable high-temperature coke oven flue gas flow in the coke oven chimney, thereby quickly completing the conversion of the coke oven chimney from a cold state to a hot state and ensuring the normal and stable operation of the coke oven heating system;

[0020] S5. After the coke oven chimney meets the requirements of the normal and stable operation of the coke oven heating system by relying on the self-power of the high-temperature coke oven flue gas, the gas valve is closed to terminate the combustion reaction of the flame generator.

[0021] The gas source is a combustible gas storage tank for storing combustible gas with a set pressure.

[0022] The gas valve is a normally closed electric valve. The gas valve and the main flue damper are interlocked and controlled by a control system, or are directly controlled to open or close by the control system respectively.

[0023] One set of the flame generators is arranged at the bottom of the coke oven chimney, or several sets are arranged at intervals along the height of the coke oven chimney.

[0024] When several sets of the flame generators are arranged at intervals along the height of the coke oven chimney, the groups of flame generators are started synchronously, or are started sequentially from bottom to top at a set time interval.

[0025] The equipment that provides power for the emission of coke oven flue gas is the induced draft fan in the coke oven flue gas desulfurization and denitrification system.

[0026] A system for converting a coke oven chimney from a cold state to a hot state, comprising a coke oven chimney and a flame generating device; the coke oven chimney is connected to a coke oven through a main flue of the coke oven, and a main flue damper is arranged on the main flue of the coke oven; the flame generating device includes a gas source, a gas valve, a gas pipeline and a flame generator, the flame generator is arranged in the coke oven chimney, and at least one set of flame generators is arranged at the bottom of the coke oven chimney; the gas inlet of the flame generator is connected to the gas source through the gas pipeline, and a gas valve is arranged on the gas pipeline; the main flue damper is an electric valve plate, and the gas valve is a normally closed electric valve; the main flue damper and the gas valve are respectively connected to a control system.

[0027] A plurality of sets of the flame generators are arranged along the height of the coke oven chimney, and each set of flame generators is composed of a plurality of flame generators uniformly arranged along the circumferential direction of the coke oven chimney. The plurality of flame generators in the same group are connected to the gas pipeline through an annular gas supply pipeline.

[0028] The main flue of the coke oven is provided with a flue gas outlet at one end close to the coke oven, and a flue gas inlet at one end downstream of the main flue damper and close to the coke oven chimney. The flue gas outlet and the flue gas inlet are connected through a coke oven flue gas pipeline. A coke oven flue gas desulfurization and denitrification system and a coke oven flue gas waste heat recovery system are sequentially arranged on the coke oven flue gas pipeline along the flow direction of the coke oven flue gas.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1) Low construction cost, simple maintenance, reliable operation and low cost;

[0031] By setting up a flame generating device, when the coke oven flue gas desulfurization and denitrification system fails or a power outage occurs emergency, causing the system to shut down, a gravitational force is formed in the coke oven chimney to guide the high-temperature coke oven flue gas from the main flue of the coke oven to quickly discharge through the coke oven chimney, enabling the cold coke oven chimney to quickly return to the state ensuring normal production of the coke oven; compared with the prior art, there is no need to set up heat exchange equipment, avoiding the increase in the construction cost of the coke oven flue gas desulfurization and denitrification system, and significantly reducing the engineering construction cost;

[0032] A stable combustible gas is provided to the flame generator through a gas source (such as a container with a certain volume and capable of storing combustible gas at a set pressure or other facilities that can provide stable combustible gas). When the coke oven changes from the cold state to the hot state, only a limited amount of combustible gas in the gas source is consumed, and there is no need for continuous supply of combustible gas (no energy is consumed when the flame generating device is not started), the system maintenance is simple and convenient, and the operation cost is low.

[0033] 2) The ultimate recovery and utilization of the waste heat energy of the coke oven flue gas can be realized;

[0034] The present invention changes the way of the prior art that uses hot flue gas or hot air with sufficient temperature to continuously pass through the coke oven chimney for a long time to maintain the hot standby state of the chimney. The temperature of the coke oven flue gas discharged through the coke oven chimney can be reduced to below 100°C, so as to give full play to the role of the coke oven flue gas waste heat recovery system; at the same time, there is no need to supplement additional energy to meet the hot standby needs of the coke oven chimney, achieving energy conservation and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of a system for converting a coke oven chimney from the cold state to the hot state according to the present invention.

[0036] Figure 2 is a schematic diagram of a multi-layer heating device provided in the coke oven chimney according to the present invention.

[0037] Figure 3 is Figure 2 the A-A view in

[0038] In the figure: 1. Gas source 2. Gas valve 3. Gas pipeline 4. Flame generator 5. Main flue damper 6. Coke oven 7. Coke oven flue gas desulfurization and denitrification system 8. Coke oven flue gas waste heat recovery system 9. Coke oven chimney DETAILED DESCRIPTION OF THE INVENTION

[0039] The following further describes the specific embodiments of the present invention in conjunction with the drawings:

[0040] Such as Figure 1As shown in the figure, for the method of converting a coke oven chimney from a cold state to a hot state in the present invention, a flame generator 4 is arranged in the coke oven chimney 9. The flame generator 4 is connected to a gas source 1 through a gas pipeline 3, and a gas valve 2 is arranged on the gas pipeline 3. When the equipment that provides power for the flue gas discharge of the coke oven 6 fails and the coke oven flue gas needs to be discharged by relying on the gravitational force of the coke oven chimney 9, the flame generator 4 is turned on, so that the coke oven chimney 9 is quickly converted from a cold state to a hot state, and a hot air flow from the root upwards is formed in the coke oven chimney 9, guiding the high-temperature coke oven flue gas from the main flue of the coke oven to continuously rise and be discharged through the coke oven chimney 9, forming the pressure difference required for the normal production of the coke oven 6.

[0041] The method of converting a coke oven chimney from a cold state to a hot state in the present invention is specifically as follows:

[0042] S1. When the equipment that provides the required power for the normal production of the coke oven 6 is out of service or interrupted due to a sudden failure, the cold coke oven chimney 9 is quickly put into use; while the main flue damper 5 is opened, the gas valve 2 arranged on the gas pipeline 3 is opened.

[0043] S2. The combustible gas stored in the gas source 1 enters the flame generator 4 along the gas pipeline 3 and undergoes a combustion reaction in the coke oven chimney 9; the hot air flow generated by the combustion flows upwards from the root of the coke oven chimney 9, driving the cold air in the coke oven chimney 9 to flow upwards and be discharged from the top of the coke oven chimney 9.

[0044] S3. The high-temperature coke oven flue gas from the main flue of the coke oven flows from the root to the top outlet of the coke oven chimney 9 under the entrainment effect of the hot air flow generated in the coke oven chimney 9 and the thermal buoyancy effect of the flue gas itself.

[0045] S4. The flow of the high-temperature coke oven flue gas in the coke oven chimney 9 generates a pressure difference inside and outside the coke oven chimney 9, prompting a stable high-temperature coke oven flue gas flow to be formed in the coke oven chimney 9, thereby quickly completing the conversion of the coke oven chimney 9 from a cold state to a hot state and ensuring the normal and stable operation of the coke oven heating system.

[0046] S5. After the coke oven chimney 9 relies on the self-power of the high-temperature coke oven flue gas to meet the requirements of the normal and stable operation of the coke oven heating system, the gas valve 2 is closed to terminate the combustion reaction of the flame generator 4.

[0047] The gas source 1 is a combustible gas storage tank for storing combustible gas with a set pressure.

[0048] The gas valve 2 is a normally closed electric valve. The gas valve 2 and the main flue damper 5 are interlocked and controlled by a control system, or are directly controlled to be opened or closed by the control system respectively.

[0049] One group of the flame generators 4 is arranged at the bottom of the coke oven chimney 9, or several groups are arranged at intervals along the height of the coke oven chimney 9 (such asFigure 2 as shown

[0050] When several groups of the flame generators 4 are arranged at intervals in the height direction along the coke oven chimney 9, each group of the flame generators 4 is started synchronously, or started successively from bottom to top at a set time interval.

[0051] The equipment that provides power for the coke oven flue gas emission is the induced draft fan in the coke oven flue gas desulfurization and denitration system 7.

[0052] The system for converting a coke oven chimney from a cold state to a hot state according to the present invention includes a coke oven chimney 9 and a flame generating device; the coke oven chimney 9 is connected to a coke oven 6 through a coke oven main flue, and a main flue gate 5 is provided on the coke oven main flue; the flame generating device includes a gas source 1, a gas valve 2, a gas pipeline 3 and a flame generator 4, the flame generator 4 is arranged in the coke oven chimney 9, and at least one group of flame generators 4 is arranged at the bottom of the coke oven chimney 9; the gas inlet of the flame generator 4 is connected to the gas source 1 through the gas pipeline 3, and a gas valve 2 is provided on the gas pipeline 3; the main flue gate 5 is an electric valve plate, and the gas valve 2 is a normally closed electric valve; the main flue gate 5 and the gas valve 2 are respectively connected to a control system.

[0053] The flame generator 4 is arranged in multiple groups in the height direction along the coke oven chimney 9, and each group of flame generators 4 is composed of a plurality of flame generators 4 evenly arranged in the circumferential direction along the coke oven chimney 9 (as Figure 3 shown), and the multiple flame generators 4 in the same group are connected to the gas pipeline 3 through an annular gas supply pipeline.

[0054] The coke oven main flue is provided with a flue gas outlet at one end close to the coke oven 6, and a flue gas inlet at one end downstream of the main flue gate 5 and close to the coke oven chimney 9. The flue gas outlet and the flue gas inlet are connected through a coke oven flue gas pipeline, and a coke oven flue gas desulfurization and denitration system 7 and a coke oven flue gas waste heat recovery system 8 are successively arranged on the coke oven flue gas pipeline along the flowing direction of the coke oven flue gas.

[0055] The technical advantage of the present invention is that the temperature of the coke oven flue gas discharged through the coke oven chimney 9 can not consider the hot standby requirement of the coke oven chimney 9, so that the waste heat energy of the coke oven flue gas can be recovered to the limit through the coke oven flue gas waste heat recovery system 8.

[0056] In order to more intuitively reflect the present invention, the implementation manner of the present invention will be further described in combination with embodiments. The following embodiments are only the preferred specific implementation manners of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution that can be obviously obtained by those skilled in the art within the technical scope disclosed by the present invention, including simple changes or equivalent replacements, is within the protection scope of the present invention.

[0057]

Embodiment 1

[0058] such asFigure 1 As shown in the figure, in this embodiment, a set of flame generators 4 are provided at the root of the coke oven chimney 9. The flame generators 4 are connected to the gas source 1 through a gas pipeline 3, and a gas valve 2 is provided on the gas pipeline 3. Both the gas source 1 and the gas valve 2 are arranged outside the coke oven chimney 9, and the flame generators 4 are arranged inside the coke oven chimney 9.

[0059] In this embodiment, the gas source 1 adopts a combustible gas storage tank with a certain volume and storing combustible gas under a certain pressure, and the pressure state is always maintained in the combustible gas storage tank during the closing period of the gas valve 2.

[0060] In this embodiment, the gas valve 2 is a normally closed electric valve, and it is linked with the main flue damper 5 to be opened through a control system.

[0061] During the normal production of the coke oven 6, the pressure required by the coke oven heating system is provided by the induced draft fan in the coke oven flue gas desulfurization and denitrification system 7. The coke oven flue gas realizes pollutant reduction and waste heat recovery through the coke oven flue gas desulfurization and denitrification system 7 and the coke oven flue gas waste heat recovery system 8. The clean flue gas after desulfurization, denitrification and waste heat recovery is finally discharged through the coke oven chimney 9.

[0062] When the coke oven flue gas desulfurization and denitrification system 7 stops operating due to a fault or an emergency power outage, the pressure required by the coke oven heating system can no longer be provided by the induced draft fan in the coke oven flue gas desulfurization and denitrification system 7. At this time, the main flue damper 5 is opened, and at the same time, the gas valve 2 on the gas pipeline 3 between the gas source 1 and the flame generators 4 is opened. The combustible gas in the gas source 1 flows into the flame generators 4 inside the coke oven chimney 9 along the gas pipeline 3 and undergoes a combustion reaction. The hot gas flow generated by the combustion flows upward from the root of the coke oven chimney 9, driving the cold air in the coke oven chimney 9 to flow upward to the top outlet of the coke oven chimney 9.

[0063] While the hot gas flow generated by the combustion drives the cold air in the coke oven chimney 9 to flow upward out of the coke oven chimney 9, with the opening of the main flue damper 5, the high-temperature coke oven flue gas from the main flue of the coke oven quickly flows from the root of the coke oven chimney 9 to the top outlet of the coke oven chimney 9 under the action of the entrainment of the hot gas flow and the self-thermal buoyancy of the flue gas.

[0064] The flow of the high-temperature coke oven flue gas in the coke oven chimney 9 generates a pressure difference between the inside and outside of the coke oven chimney 9, prompting a stable high-temperature coke oven flue gas flow to be formed inside the coke oven chimney 9, thereby quickly completing the conversion of the coke oven chimney 9 from the cold state to the hot state, ensuring the normal and stable operation of the coke oven heating system, and avoiding affecting the normal production of the coke oven 6.

[0065] When the coke oven chimney 9 meets the requirements of the normal and stable operation of the coke oven heating system by relying on the self-power of the coke oven flue gas, the gas valve 2 is closed, and the combustion reaction of the flame generators 4 stops.

[0066]

Embodiment 2

[0067] The basic process of this embodiment is the same as that of Embodiment 1. The difference is that in this embodiment, 3 groups of flame generators 4 are arranged at intervals and in sections along the height direction (from the root to the top outlet direction) of the coke oven chimney 9. As Figure 2 , Figure 3 shown, the flame generators 4 in the same group at the same height are composed of a plurality of flame generators 4 evenly distributed circumferentially along the coke oven chimney 9. Each flame generator 4 is connected to the gas pipeline 3 through an annular gas supply pipeline and finally communicates with the gas source 1.

[0068] When the coke oven flue gas desulfurization and denitrification system 7 shuts down due to a fault or an emergency power outage, the pressure required by the coke oven heating system can no longer be provided by the induced draft fan in the coke oven flue gas desulfurization and denitrification system 7; at this time, the main flue damper 5 is opened, and at the same time, the gas valve 2 on the gas pipeline 3 between the gas source 1 and the flame generator 4 is opened. The combustible gas in the gas source 1 enters the 3 groups of flame generators 4 inside the coke oven chimney 9 along the gas pipeline, and the 3 groups of flame generators 4 arranged in sections from bottom to top sequentially undergo combustion reactions at an interval of 30 s. The hot air flow generated by the combustion flows upward inside the coke oven chimney 9, driving the cold air inside the coke oven chimney 9 to flow upward to the top outlet of the coke oven chimney 9.

[0069] While the hot air flow generated by the combustion drives the cold air inside the coke oven chimney 9 to flow upward out of the coke oven chimney 9, with the opening of the main flue damper 5 of the coke oven, the high-temperature coke oven flue gas from the main flue of the coke oven quickly flows from the root of the coke oven chimney 9 to the top outlet of the coke oven chimney 9 under the action of the entrainment of the hot air flow and the self-thermal buoyancy of the flue gas.

[0070] The flow of the high-temperature coke oven flue gas inside the coke oven chimney 9 creates a pressure difference between the inside and outside of the coke oven chimney 9, prompting the formation of a stable high-temperature coke oven flue gas flow inside the coke oven chimney 9, thereby quickly completing the conversion of the coke oven chimney 9 from the cold state to the hot state, ensuring the normal and stable operation of the coke oven heating system, and avoiding affecting the normal production of the coke oven 6.

[0071] When the coke oven chimney 9 meets the requirements of the normal and stable operation of the coke oven heating system by relying on the self-power of the coke oven flue gas, the gas valve is closed, and the combustion reaction of the flame generator 4 stops.

[0072] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A method for converting a coke oven chimney from a cold state to a hot state, characterized in that A flame generator is installed inside the coke oven chimney. The flame generator is connected to a gas source through a gas pipeline, and a gas valve is provided on the gas pipeline. When the equipment that provides power for the emission of coke oven flue gas fails and the coke oven flue gas needs to be discharged by the gravity of the coke oven chimney, the flame generator is turned on, enabling the coke oven chimney to quickly convert from a cold state to a hot state, and forming a hot air flow from the root upwards inside the coke oven chimney, guiding the high-temperature coke oven flue gas from the main coke oven flue to continuously flow upwards and be discharged through the coke oven chimney, thus forming the pressure difference required for the normal production of the coke oven.

2. A method for converting a coke oven chimney from a cold state to a hot state according to claim 1, characterized in that, The specific process is as follows: S1. When the equipment that provides the required power for the normal production of the coke oven is out of service or interrupted due to a sudden failure, the coke oven chimney in the cold state is quickly put into use; while the main flue damper is opened, the gas valve provided on the gas pipeline is opened. S2. The combustible gas stored in the gas source enters the flame generator along the gas pipeline and undergoes a combustion reaction inside the coke oven chimney; the hot air flow generated by the combustion flows upwards from the root of the coke oven chimney, driving the cold air inside the coke oven chimney to flow upwards and be discharged from the top of the coke oven chimney. S3. The high-temperature coke oven flue gas from the main coke oven flue flows from the root to the top outlet of the coke oven chimney under the entrainment effect of the hot air flow generated inside the coke oven chimney and the thermal buoyancy of the flue gas itself. S4. The flow of the high-temperature coke oven flue gas inside the coke oven chimney creates a pressure difference inside and outside the coke oven chimney, prompting the formation of a stable high-temperature coke oven flue gas flow inside the coke oven chimney, thereby quickly completing the conversion of the coke oven chimney from a cold state to a hot state and ensuring the normal and stable operation of the coke oven heating system. S5. After the coke oven chimney relies on the self-power of the high-temperature coke oven flue gas to meet the requirements for the normal and stable operation of the coke oven heating system, the gas valve is closed to terminate the combustion reaction of the flame generator.

3. A method for converting a coke oven chimney from a cold state to a hot state according to claim 1, characterized in that, The gas source is a combustible gas storage tank for storing combustible gas with a set pressure.

4. A method for converting a coke oven chimney from a cold state to a hot state according to claim 1, characterized in that, The gas valve is a normally closed electric valve. The gas valve and the main flue damper are interlocked and controlled by a control system, or are directly controlled to be opened or closed by the control system respectively.

5. A method for converting a coke oven chimney from a cold state to a hot state according to claim 1, characterized in that, One set of flame generators is installed at the bottom of the coke oven chimney, or several groups are arranged at intervals along the height of the coke oven chimney.

6. A method for converting a coke oven chimney from a cold state to a hot state according to claim 5, characterized in that, When several groups of flame generators are arranged at intervals along the height of the coke oven chimney, each group of flame generators starts simultaneously, or starts sequentially from bottom to top at a set time interval.

7. A method for converting a coke oven chimney from a cold state to a hot state according to claim 1, characterized in that, The equipment that provides power for the emission of coke oven flue gas is the induced draft fan in the coke oven flue gas desulfurization and denitration system.

8. A system for converting a coke oven chimney from a cold state to a hot state, which is used to implement the method for converting a coke oven chimney from a cold state to a hot state according to any one of claims 1 to 7, characterized in that, It includes a coke oven chimney and a flame generating device; the coke oven chimney is connected to the coke oven through the main coke oven flue, and a main flue damper is provided on the main coke oven flue; the flame generating device includes a gas source, a gas valve, a gas pipeline and a flame generator. The flame generator is installed inside the coke oven chimney, and at least one set of flame generators is installed at the bottom of the coke oven chimney; the gas inlet of the flame generator is connected to the gas source through the gas pipeline, and a gas valve is provided on the gas pipeline; the main flue damper is an electric valve plate, and the gas valve is a normally closed electric valve; the main flue damper and the gas valve are respectively connected to the control system.

9. The system for converting a coke oven chimney from a cold state to a hot state according to claim 8, wherein, A plurality of groups of the flame generators are arranged in the height direction of the coke oven chimney. Each group of flame generators is composed of a plurality of flame generators uniformly arranged in the circumferential direction of the coke oven chimney. The plurality of flame generators in the same group are connected to the gas pipeline through an annular gas supply pipeline.

10. A system for converting a coke oven chimney from a cold state to a hot state according to claim 8, characterized in that, At one end of the coke oven main flue close to the coke oven, a flue gas outlet is provided. At the downstream of the main flue damper and close to one end of the coke oven chimney, a flue gas inlet is provided. The flue gas outlet and the flue gas inlet are connected through a coke oven flue gas pipeline. Along the flow direction of the coke oven flue gas, a coke oven flue gas desulfurization and denitration system and a coke oven flue gas waste heat recovery system are successively arranged on the coke oven flue gas pipeline.

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