CN112280573A - System and method for realizing stable yield and high yield of dry quenching steam - Google Patents
System and method for realizing stable yield and high yield of dry quenching steam Download PDFInfo
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- CN112280573A CN112280573A CN202011207003.4A CN202011207003A CN112280573A CN 112280573 A CN112280573 A CN 112280573A CN 202011207003 A CN202011207003 A CN 202011207003A CN 112280573 A CN112280573 A CN 112280573A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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Abstract
The invention relates to a system and a method for realizing stable yield and high yield of dry quenching steam, wherein the system comprises a dry quenching system, an air forced blowing-in system and a combustible gas supply distribution system; the air forced blowing system comprises a forced air blower and a main blowing pipeline; the combustible gas supply distribution system comprises a combustible gas main pipeline, a combustible gas branch pipeline and a combustible gas distributor; the invention can effectively eliminate the influence of the dry quenching system fault or the coke oven maintenance on the dry quenching steam yield, stabilize and improve the dry quenching steam yield; in addition, the problem of equipment investment waste caused by low operation load of a single set of dry quenching equipment when a full dry quenching process is adopted can be solved, and the possible damage of the dry quenching boiler caused by long-time low-load operation is avoided.
Description
Technical Field
The invention relates to the technical field of dry quenching, in particular to a system and a method for realizing stable yield and high yield of dry quenching steam.
Background
The production process of the conventional dry quenching system is shown in figure 1, red hot high-temperature coke is loaded into a dry quenching furnace 1 from an inlet of the top of the dry quenching furnace through a mechanical lifting device, and is in countercurrent contact with inert circulating gas V1 blown from the bottom of the dry quenching furnace 1 for heat exchange, the cooled coke is discharged from the bottom of the dry quenching furnace 1 to finish dry quenching, the inert circulating gas V2 heated to 900-1000 ℃ wraps a large amount of coke powder and is discharged from an annular air duct outlet of the dry quenching furnace 1 to enter a gravity settling dust collector 2, large-particle coke powder is collected after being deposited in the gravity settling dust collector 2, the purified high-temperature inert circulating gas V3 continuously flows into a dry quenching boiler 3 and is cooled to below 180 ℃ in countercurrent heat exchange with boiler feed water W3, meanwhile, boiler feed water W3 absorbs heat and is vaporized to generate high-temperature high-pressure or medium-temperature steam S1 for downstream sections, the cooled circulating gas V4 continuously flows into a centrifugal force settling dust collector 4, after centrifugal force sedimentation, fine particle coke powder is collected after deposition, purified inert circulating gas V5 continuously flows into a circulating fan 5, pressurized inert circulating gas V6 discharged after pressurization enters a boiler feed water preheating device 6, and in the boiler feed water preheating device 6, the pressurized inert circulating gas V6 is further cooled through preheating boiler feed water W1 and then enters the dry quenching furnace 1 from the lower part of the furnace to exchange heat with coke.
During the operation of the conventional dry quenching system, combustible volatile components in coke in the dry quenching furnace are separated out and enter the circulating gas, and simultaneously, moisture in the circulating gas reacts with the coke in the dry quenching furnace to generate CO and CH4When the combustible gas is equal, the combustible components in the circulating gas are continuously accumulated due to the factors, the explosion risk exists when the concentration reaches a certain value, air is required to be supplied to the gas circulating system through the air natural suction system 7, the combustible components are combusted, the stable operation of the whole system is ensured, and meanwhile, the combustible gas is dried outThe furnace internal pressure control pipe 8 releases part of the circulating gas to the outside of the system to ensure the stable flow of the circulating gas of the whole system.
When the conventional dry quenching system fails, the dry quenching furnace cannot be charged with red hot high-temperature coke or cannot discharge cooled coke. At the moment, the coke dry quenching system has no heat input, the flow rate of the circulating gas is correspondingly reduced, the heat provided for the coke dry quenching boiler is reduced, and the flow rate of steam output by the coke dry quenching boiler is reduced, which causes adverse effects on downstream steam users (such as a turbonator plant).
In addition, the operation of the conventional dry quenching system can be influenced by the production of the coke oven; the coke oven requires equipment to be overhauled and maintained within a turnaround time. Coke oven coke discharging is avoided in the coke oven overhaul and maintenance stage, and the dry quenching system does not have red hot coke supply and heat input. In the stage, the coke dry quenching system needs to reduce the coke discharge amount and the circulating gas flow rate, and heat is stably input into the coke dry quenching boiler under the condition that the coke level in the coke dry quenching boiler is kept to be certain. It should be noted that the coke oven maintenance phase is lower in the amount of heat received by the dry quenching boiler than other phases, and therefore, the flow rate of steam output by the dry quenching boiler is also smaller, which causes the flow rate of steam output by the dry quenching boiler to periodically fluctuate, which also adversely affects downstream steam users (such as a turbonator plant).
When a full dry quenching process system is adopted in the quenching process of coking production (namely, a standby wet quenching system is not arranged, and a dry quenching station consisting of a plurality of sets of dry quenching systems is adopted to realize full-time continuous dry quenching), each set of dry quenching system participates in cooling coke to recover heat under normal working conditions, each set of dry quenching system operates under the condition of 60-70% of the design load, and when one set of dry quenching system is overhauled, maintained or annual repaired, the rest dry quenching systems operate under the condition of 90-100% of the design load. Therefore, the working system of the full dry quenching process system leads each set of dry quenching equipment to be operated only within 60-70% of the design capacity most of the time, which not only wastes equipment resources and increases equipment investment cost, but also causes damage to a boiler system due to long-time low-load operation.
Disclosure of Invention
The invention provides a system and a method for realizing stable yield and high yield of dry quenching steam, which can effectively eliminate the influence of dry quenching system faults or coke oven maintenance on the yield of the dry quenching steam, stabilize and improve the yield of the dry quenching steam; in addition, the problem of equipment investment waste caused by low operation load of a single set of dry quenching equipment when a full dry quenching process is adopted can be solved, and the possible damage of the dry quenching boiler caused by long-time low-load operation is avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for realizing stable yield and high yield of dry quenching steam comprises a dry quenching system; the dry quenching system comprises a dry quenching furnace, a gravity settling dust remover, a dry quenching boiler, a centrifugal force settling dust remover, a circulating fan and a boiler feed water preheating device which are sequentially connected through a gas circulation pipeline and are connected end to form a circulating system; the device also comprises an air forced blowing system and a combustible gas supply distribution system; wherein:
the forced air blowing system comprises a forced air blower and a main air blowing pipeline, and the forced air blower is connected with an annular air duct of the dry quenching furnace through the main air blowing pipeline;
the combustible gas supply distribution system comprises a combustible gas main pipeline, a combustible gas branch pipeline and a combustible gas distributor; one end of the combustible gas main pipeline is connected with a combustible gas source, and the other end of the combustible gas main pipeline is communicated with a circulating gas outlet section of the dry quenching furnace through a combustible gas branch pipeline and a combustible gas distributor which are connected in sequence.
The forced air blowing-in system also comprises a natural air suction pipeline, an air suction cut-off valve, an air flow regulating valve and an air flow meter; the main air blowing pipeline is connected with a natural air suction pipeline, and an air suction cut-off valve is arranged on the natural air suction pipeline; along the air flow direction, an air flow meter and an air flow regulating valve are sequentially arranged on the blast main pipeline at the downstream of the natural air suction pipeline.
The combustible gas supply distribution system also comprises a main pipeline cut-off valve, a branch pipeline cut-off valve, a combustible gas flow regulating valve, a combustible gas flowmeter and a combustible gas pressure measuring device; along the flowing direction of the combustible gas, a combustible gas pressure measuring device, a combustible gas flowmeter, a main pipeline cut-off valve and a combustible gas flow regulating valve are sequentially arranged on a combustible gas main pipeline; the branch combustible gas pipeline is provided with a branch pipeline cut-off valve at one end close to the combustible gas distributor.
A system for realizing stable yield and high yield of dry quenching steam also comprises a nitrogen-filled protection and diffusion system; the nitrogen charging protection and diffusion system consists of a nitrogen main pipeline, a nitrogen branch pipe I, a nitrogen branch pipe II, a nitrogen branch pipe III, a nitrogen shutoff valve, a diffusion pipe and a diffusion valve; the combustible gas main pipeline is provided with a first nitrogen inlet at the downstream of the main pipeline cut-off valve, the combustible gas branch pipeline is provided with a second nitrogen inlet at the upstream of the branch pipeline cut-off valve, and the combustible gas distributor is provided with a third nitrogen inlet at the upstream of the combustible gas distributor; one end of the nitrogen main pipeline is connected with a nitrogen source, and the other end of the nitrogen main pipeline is respectively connected with a first nitrogen inlet through a first nitrogen branch pipe, a second nitrogen inlet through a second nitrogen branch pipe, and a third nitrogen inlet through a third nitrogen branch pipe; nitrogen shut-off valves are respectively arranged on the nitrogen branch pipe I, the nitrogen branch pipe II and the nitrogen branch pipe III; the diffusing pipe is arranged at the highest position of the combustible gas supply distribution system, and a diffusing valve is arranged on the diffusing pipe.
And an air suction cut-off valve in the air forced blowing system is controlled by interlocking with the forced blower.
And the combustible gas pressure measuring device in the combustible gas supply distribution system is controlled with the main pipeline cut-off valve and the branch pipeline cut-off valve in an interlocking manner.
And a forced blower in the air forced blowing system is controlled by interlocking with a main pipeline cut-off valve and a branch pipeline cut-off valve in the combustible gas supply distribution system.
And an air flow regulating valve in the air forced blowing-in system and a combustible gas flow regulating valve in the combustible gas supply distribution system are connected with a steam flow meter arranged on a steam pipeline in the coke dry quenching boiler to form a negative feedback regulating system.
A method for realizing stable yield and high yield of dry quenching steam comprises the following steps:
the red hot high-temperature coke enters the dry quenching furnace from the top inlet of the dry quenching furnace, is in countercurrent contact with circulating gas blown from the bottom of the dry quenching furnace for heat exchange, the cooled coke is discharged from the bottom of the dry quenching furnace to finish dry quenching, and the heated circulating gas is discharged from the annular air duct outlet of the dry quenching furnace;
combustible gas sequentially flows through a combustible gas main pipeline, a combustible gas branch pipeline and a combustible gas distributor and enters a circulating gas outlet section of the dry quenching furnace, and meanwhile, ambient air is pressurized by a forced air blower and then enters an annular air duct of the dry quenching furnace through a blast main pipeline to provide combustion improver for the combustion of the combustible gas;
combustible gas, air and circulating gas of a dry quenching system are mixed together and are completely combusted in the process of flowing through the gravity settling dust remover, and waste gas generated by combustion and heat released by combustion reaction enter a dry quenching boiler along with the circulating gas; in a dry coke quenching boiler, circulating gas and boiler feed water are in countercurrent contact for heat exchange, the boiler feed water absorbs heat and is vaporized to generate high-temperature high-pressure or medium-temperature medium-pressure steam for a downstream working section to use, and the cooled circulating gas flows through a centrifugal force settling dust remover, is pressurized by a circulating fan, flows through a boiler feed water preheating device, and enters the dry coke quenching boiler from the bottom of the dry coke quenching boiler to exchange heat with coke;
the combustible gas flow regulating valve on the combustible gas main pipeline, the air flow regulating valve on the blast main pipeline and the steam flow meter on the steam pipeline in the dry quenching boiler are connected, the opening degrees of the combustible gas flow regulating valve and the air flow regulating valve are automatically controlled through the feedback of the steam flow meter, namely the supply quantity of combustible gas and air is adjusted, so that the heat supplied to the dry quenching boiler and the flow of circulating gas are adjusted, thereby eliminating the fluctuation of the steam yield of the dry quenching boiler, improving the steam yield and simultaneously ensuring the dry quenching system to operate in a designed load high-efficiency area; the adjustment process is as follows:
when the steam flow is in a descending trend, the opening degree of the combustible gas flow regulating valve and the air flow regulating valve is increased, namely the supply quantity of combustible gas and air is increased, so that the heat generated by combustion is increased, the heat transfer in the dry quenching boiler is increased, and the steam flow is increased; on the contrary, when the steam flow is in an ascending trend, the opening degree of the combustible gas flow regulating valve and the air flow regulating valve is reduced, namely the supply quantity of combustible gas and air is reduced, so that the heat generated by combustion is reduced, the heat transfer in the coke dry quenching boiler is reduced, and the steam flow is reduced;
meanwhile, the combustible gas flowmeter and the air flowmeter respectively record the supply amount of combustible gas and air, so that the adjustable quantitative supply of the combustible gas and the air is realized.
The dry quenching system is provided with safety protection measures; the method specifically comprises the following steps:
under normal working conditions, the air suction cut-off valve is in a closed state, when the forced air blower is stopped due to faults, the air suction cut-off valve is automatically opened, air enters the coke dry quenching gas circulation system in a natural suction mode to ensure air supply, and meanwhile, the main pipeline cut-off valve and the branch pipeline cut-off valve are automatically closed to stop supplying combustible gas to the gas circulation system, so that the system safety is ensured;
when the combustible gas pressure measuring device detects that the pressure of the combustible gas in the main combustible gas pipeline is continuously lower than a set value, the main pipeline cut-off valve and the branch pipeline cut-off valve are automatically closed, and the supply of the combustible gas to the dry quenching gas circulating system is stopped; and meanwhile, a nitrogen shutoff valve and a diffusion valve in the nitrogen-filled protection diffusion system are automatically opened, nitrogen enters the combustible gas main pipeline and the combustible gas branch pipeline, and combustible gas in the combustible gas main pipeline and the combustible gas branch pipeline is replaced and diffused to the environment.
Compared with the prior art, the invention has the beneficial effects that:
1) by arranging the combustible gas supply distribution system and the air forced blowing system, the influence of coke dry quenching system faults or coke oven maintenance on coke dry quenching steam yield is effectively eliminated, and the coke dry quenching steam yield is stabilized and improved;
2) the equipment investment waste caused by low operation load of a single set of dry quenching equipment when a full dry quenching process is adopted is solved, and the possible damage of a dry quenching boiler caused by long-time low-load operation is avoided;
3) complete safety protection measures are set.
Drawings
Fig. 1 is a schematic structural view of a conventional dry quenching system.
FIG. 2 is a schematic structural diagram of a system for realizing stable yield and high yield of dry quenching steam.
Fig. 3 is a schematic view showing the structure of the forced air induction system according to the present invention.
FIG. 4 is a schematic view showing the structure of the combustible gas supply distribution system according to the invention.
In the figure: 1. 1-1 part of dry quenching furnace, 1-2 parts of annular air duct, 2 parts of circulating gas outlet section, 2 parts of gravity settling dust remover, 3 parts of dry quenching furnace, 4 parts of centrifugal force settling dust remover, 5 parts of circulating fan, 6 parts of boiler feed water preheating device, 7 parts of air natural suction system, 8 parts of pressure control pipeline, 9 parts of gas circulation pipeline, 10 parts of air forced blowing system, 10 parts of forced blower, 10-2 parts of main blowing pipeline, 10-3 parts of natural suction pipeline, 10-4 parts of suction cut-off valve, 10-5 parts of air flow meter, 10-6 parts of air flow meter, 11 parts of gas flow regulating valve, 11 parts of combustible gas supply distribution system, 11 parts of combustible gas main pipeline, 11 parts of combustible gas pressure measuring device, 11-3 parts of combustible gas flow meter, 11-4 parts of main pipeline cut-off valve, 11 11-7 parts of body branch pipeline, 11-8 parts of branch pipeline stop valve, 12 parts of combustible gas distributor, 13 parts of steam pipeline, 14 parts of steam flowmeter, 15-1 parts of boiler water supply pipeline, 15-2 parts of nitrogen main pipeline, 15-3 parts of nitrogen stop valve, 15-4 parts of blow-off valve
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in FIG. 2, the system for realizing stable yield and high yield of dry quenching steam comprises a dry quenching system; the dry quenching system comprises a dry quenching furnace 1, a gravity settling dust remover 2, a dry quenching boiler 3, a centrifugal force settling dust remover 4, a circulating fan 5 and a boiler feed water preheating device 6 which are sequentially connected through a gas circulation pipeline 9 and are connected end to form a circulating system; the device also comprises an air forced blowing system 10 and a combustible gas supply distribution system 11; wherein:
as shown in fig. 3, the forced air blowing system 10 comprises a forced air blower 10-1 and a main air blowing duct 10-2, wherein the forced air blower 10-1 is connected with an annular air duct 1-1 of the dry quenching furnace 1 through the main air blowing duct 10-2;
as shown in fig. 4, the combustible gas supply distribution system 11 comprises a combustible gas main pipeline 11-1, a combustible gas branch pipeline 11-6 and a combustible gas distributor 11-8; one end of the combustible gas main pipeline 11-1 is connected with a combustible gas source, and the other end is communicated with a circulating gas outlet section 1-2 of the dry quenching furnace 1 through a combustible gas branch pipeline 11-6 and a combustible gas distributor 11-8 which are connected in sequence.
The forced air blowing system 10 also comprises a natural air suction pipeline 10-3, an air suction cut-off valve 10-4, an air flow regulating valve 10-6 and an air flow meter 10-5; the main air blowing pipeline 10-2 is connected with a natural air suction pipeline 10-3, and an air suction cut-off valve 10-4 is arranged on the natural air suction pipeline 10-3; along the air flowing direction, an air flow meter 10-5 and an air flow regulating valve 10-6 are sequentially arranged on the main blowing pipe 10-2 at the downstream of the natural air suction pipeline 10-3.
The combustible gas supply distribution system 11 also comprises a main pipeline cut-off valve 11-4, a branch pipeline cut-off valve 11-7, a combustible gas flow regulating valve 11-5, a combustible gas flowmeter 11-3 and a combustible gas pressure measuring device 11-2; along the flowing direction of combustible gas, a combustible gas pressure measuring device 11-2, a combustible gas flowmeter 11-3, a main pipeline cut-off valve 11-4 and a combustible gas flow regulating valve 11-5 are sequentially arranged on a combustible gas main pipeline 11-1; one end of the combustible gas branch pipeline 11-6 close to the combustible gas distributor 11-8 is provided with a branch pipeline cut-off valve 11-7.
The device also comprises a nitrogen-filled protection and diffusion system; the nitrogen charging protection and diffusion system consists of a nitrogen main pipeline 15-1, a nitrogen branch pipe I, a nitrogen branch pipe II, a nitrogen branch pipe III, a nitrogen shutoff valve 15-2, a diffusion pipe 15-3 and a diffusion valve 15-4; a first nitrogen inlet is arranged at the downstream of a main pipeline cut-off valve 11-4 of the main combustible gas pipeline 11-1, a second nitrogen inlet is arranged at the upstream of a branch pipeline cut-off valve 11-7 of the branch combustible gas pipeline 11-6, and a third nitrogen inlet is arranged at the upstream of a combustible gas distributor 11-8; one end of the nitrogen main pipeline 15-1 is connected with a nitrogen source, and the other end of the nitrogen main pipeline is connected with a first nitrogen inlet through a first nitrogen branch pipe, a second nitrogen inlet through a second nitrogen branch pipe, and a third nitrogen inlet through a third nitrogen branch pipe; a nitrogen shut-off valve 15-2 is respectively arranged on the nitrogen branch pipe I, the nitrogen branch pipe II and the nitrogen branch pipe III; the diffusing pipe 15-3 is arranged at the highest position of the combustible gas supply distribution system, and a diffusing valve 15-4 is arranged on the diffusing pipe 15-3.
The air suction cut-off valve 10-4 in the air forced blowing system 10 is controlled by interlocking with the forced air blower 10-1.
And a combustible gas pressure measuring device 11-2 in the combustible gas supply distribution system 11 is controlled by interlocking with a main pipeline cut-off valve 11-4 and a branch pipeline cut-off valve 11-7.
The forced air blower 10-1 in the forced air blowing system 10 is interlocked and controlled with a main pipeline cut-off valve 11-4 and a branch pipeline cut-off valve 11-7 in a combustible gas supply distribution system 11.
And an air flow regulating valve 10-6 in the air forced blowing system 10 and a combustible gas flow regulating valve 11-5 in the combustible gas supply distribution system 11 are connected with a steam flow meter 13 arranged on a steam pipeline 12 in the coke dry quenching boiler 3 to form a negative feedback regulating system.
A method for realizing stable yield and high yield of dry quenching steam comprises the following steps:
the red hot high-temperature coke enters the dry quenching furnace 1 from the top inlet of the dry quenching furnace 1 and is in countercurrent contact with the circulating gas V1 blown from the bottom of the dry quenching furnace 1 for heat exchange, the cooled coke is discharged from the bottom of the dry quenching furnace 1 to finish dry quenching, and the heated circulating gas V2 is discharged from the outlet of the annular air duct 1-1 of the dry quenching furnace 1;
combustible gas sequentially flows through a combustible gas main pipeline 11-1, a combustible gas branch pipeline 11-6 and a combustible gas distributor 11-8 and enters a circulating gas outlet section 1-2 of the dry quenching furnace 1, and meanwhile, ambient air is pressurized by a forced air blower 10-1 and then enters an annular air duct 1-1 of the dry quenching furnace 1 through a blast main pipeline 10-2 to provide a combustion improver for the combustion of the combustible gas;
combustible gas, air and circulating gas V2 of the dry quenching system are mixed together and are completely combusted in the process of flowing through the gravity settling dust collector 2, and waste gas generated by combustion and heat released by combustion reaction enter the dry quenching boiler 3 along with the circulating gas V3; in a dry quenching boiler 3, circulating gas V3 and boiler feed water W3 are in countercurrent contact for heat exchange, boiler feed water W3 absorbs heat and is vaporized to generate high-temperature high-pressure or medium-temperature medium-pressure steam S1 for a downstream working section to use, and the cooled circulating gas V4 flows through a centrifugal force sedimentation dust remover 4, is pressurized by a circulating fan 5, flows through a boiler feed water preheating device 6, and enters a dry quenching furnace 1 from the bottom of the dry quenching furnace 1 to exchange heat with coke;
a combustible gas flow regulating valve 11-5 on a combustible gas main pipeline 11-1, an air flow regulating valve 10-6 on a blast main pipeline 10-2 and a steam flow meter 13 on a steam pipeline 12 in the dry quenching boiler 3 are connected, and the opening degrees of the combustible gas flow regulating valve 11-5 and the air flow regulating valve 10-6 are automatically controlled through the feedback of the steam flow meter 13, namely the supply amount of combustible gas and air is adjusted, so that the heat supplied to the dry quenching boiler 3 and the flow of circulating gas are adjusted, thereby eliminating the steam yield fluctuation of the dry quenching boiler, improving the steam yield and simultaneously ensuring that the dry quenching system operates in a design load efficient area; the adjustment process is as follows:
when the steam flow is in a descending trend, the opening degree of the combustible gas flow regulating valve 11-5 and the air flow regulating valve 10-6 is increased, namely the supply amount of combustible gas and air is increased, so that the heat generated by combustion is increased, the heat transfer in the dry quenching boiler 3 is increased, and the steam flow is increased; on the contrary, when the steam flow is in an ascending trend, the opening degrees of the combustible gas flow regulating valve 11-5 and the air flow regulating valve 10-6 are reduced, namely the supply amount of combustible gas and air is reduced, so that the heat generated by combustion is reduced, the heat transfer in the coke dry quenching boiler 3 is reduced, and the steam flow is reduced;
meanwhile, the combustible gas flowmeter 11-3 and the air flowmeter 10-5 respectively record the supply amount of the combustible gas and the air, so that the adjustable quantitative supply of the combustible gas and the air is realized.
The dry quenching system is provided with safety protection measures; the method specifically comprises the following steps:
under normal working conditions, the air suction cut-off valve 10-4 is in a closed state, when the forced air blower 10-1 is stopped due to faults, the air suction cut-off valve 10-4 is automatically opened, air enters a dry quenching gas circulation system in a natural suction mode to ensure air supply, and meanwhile, the main pipeline cut-off valve 11-4 and the branch pipeline cut-off valve 11-7 are automatically closed to stop supplying combustible gas to the gas circulation system, so that the system safety is ensured;
when the combustible gas pressure measuring device 11-2 detects that the combustible gas pressure in the main combustible gas pipeline 11-1 is continuously lower than a set value, the main pipeline cut-off valve 11-4 and the branch pipeline cut-off valve 11-7 are automatically closed, and the supply of combustible gas to the dry quenching gas circulation system is stopped; meanwhile, a nitrogen shutoff valve 15-2 and a bleeding valve 15-4 in the nitrogen-filled protection bleeding system are automatically opened, nitrogen enters a main combustible gas pipeline 11-1 and a branch combustible gas pipeline 11-6, and combustible gas in the main combustible gas pipeline and the branch combustible gas pipeline is replaced and then is diffused to the environment.
The invention adds a combustible gas supply distribution system on the basis of the conventional dry quenching system. Combustible gas branch pipelines are respectively arranged on two sides of a circulating gas outlet section of the dry quenching furnace and are communicated with the circulating gas outlet section of the dry quenching furnace through a combustible gas distributor (a commercially available gas distributor can be adopted), and combustible gas (such as coke oven gas, blast furnace gas, natural gas and the like) enters an internal flow channel of the circulating gas outlet section of the dry quenching furnace through a combustible gas main pipeline, the combustible gas branch pipelines and the combustible gas distributor; and (3) blowing inert circulating gas from the bottom of the dry quenching furnace, carrying out countercurrent contact with high-temperature red hot coke for heat exchange, discharging the heated circulating gas from an annular air duct outlet of the dry quenching furnace, and fully mixing the heated circulating gas with the introduced combustible gas.
The invention adopts an air forced blowing system to replace a conventional air natural suction system for dry quenching so as to realize quantitative and enhanced supply of air; the inlet of the forced air blower is communicated with the atmospheric environment, the outlet of the forced air blower is communicated with the annular air duct of the dry quenching furnace through a main air duct, and air enters the annular air duct of the dry quenching furnace after being pressurized by the forced air blower and is fully mixed with the inert circulating gas.
The combustible gas and air entering the gas circulation system flow with the original circulating gas in the system while mixing, meanwhile, the temperature of the mixed combustible gas and the circulating gas reaches the ignition point, the mixed combustible gas and the oxygen in the air entering the system are subjected to combustion reaction, the combustion reaction speed is high, the combustible components are completely reacted in the process that the mixed circulating gas flows through the gravity settling dust remover, and the content of the combustible components in the circulating gas before entering the coke dry quenching boiler can be guaranteed to be zero.
Combustible volatile components separated out from coke in the dry quenching furnace and moisture in the circulating gas react with the coke in the dry quenching furnace to generate CO and CH4When the combustible gas enters the circulating gas and flows through the annular air duct of the coke dry quenching furnace, the combustible gas and oxygen in the air blown by the forced air blowing system are subjected to combustion reaction, the combustion reaction speed is high, and the combustible volatile components and the gas can be ensured to be completely reacted at the inlet of the coke dry quenching boiler.
The circulating gas after full reaction enters a dry coke-quenching boiler, the circulating gas in the dry coke-quenching boiler transfers heat to boiler feed water (input by a boiler feed water pipeline 14), and the boiler feed water is vaporized to generate high-temperature high-pressure or medium-temperature medium-pressure steam which is conveyed to downstream users through a steam pipeline. The heat transferred to the boiler feed water comprises three parts: the first part is the heat provided by the temperature reduction of the original circulating gas in the system, the second part is the heat provided by the temperature reduction of combustible volatile components in the dry quenching furnace and combustion products of the combustible gas generated by the reaction, and the third part is the heat provided by the temperature reduction of the high-temperature combustion products of the introduced combustible gas.
The heat quantity of the first part and the second part depends on the charging quantity of the high-temperature red hot coke of the dry quenching furnace and the discharging quantity of the cooled coke, and the original circulating gas flow quantity in the system. The coke charging amount, the coke discharging amount and the circulating gas flow rate are influenced by the dry quenching system failure and the periodic maintenance of the coke oven, which causes the sum of the heat quantity of the first part and the second part transferred to the boiler feed water to be unstable, so the generated steam flow rate is unstable, and the downstream steam user is adversely affected.
In order to solve the problem of unstable steam flow, the invention adds a combustible gas supply distribution system and an air forced blowing system, so that the generated third part of heat is used for eliminating the fluctuation of the sum of the first part of heat and the second part of heat, and simultaneously, the total heat transfer to the boiler feed water is increased, and the steam yield of the dry quenching boiler is improved.
When the coke quenching process of the coking production adopts a full dry quenching process, each set of dry quenching system adopts the system, namely, combustible gas and forced air blowing are introduced into a dry quenching gas circulation system, so that waste gas generated by combustion of the combustible gas is mixed into the original circulating gas to increase the total amount of the circulating gas, the dry quenching furnace, the centrifugal force sedimentation dust remover, the circulating fan and the boiler feed water preheating device are ensured to operate in a designed load high-efficiency area, and meanwhile, heat generated by combustion of the combustible gas increases heat exchange in the dry quenching boiler, so that the dry quenching boiler can operate in the designed load high-efficiency area.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A system for realizing stable yield and high yield of dry quenching steam comprises a dry quenching system; the dry quenching system comprises a dry quenching furnace, a gravity settling dust remover, a dry quenching boiler, a centrifugal force settling dust remover, a circulating fan and a boiler feed water preheating device which are sequentially connected through a gas circulation pipeline and are connected end to form a circulating system; it is characterized in that the device also comprises an air forced blowing system and a combustible gas supply distribution system; wherein:
the forced air blowing system comprises a forced air blower and a main air blowing pipeline, and the forced air blower is connected with an annular air duct of the dry quenching furnace through the main air blowing pipeline;
the combustible gas supply distribution system comprises a combustible gas main pipeline, a combustible gas branch pipeline and a combustible gas distributor; one end of the combustible gas main pipeline is connected with a combustible gas source, and the other end of the combustible gas main pipeline is communicated with a circulating gas outlet section of the dry quenching furnace through a combustible gas branch pipeline and a combustible gas distributor which are connected in sequence.
2. The system for realizing stable yield and high yield of dry quenching steam according to claim 1, wherein the forced air blowing system further comprises a natural air suction pipeline, an air suction cut-off valve, an air flow regulating valve and an air flow meter; the main air blowing pipeline is connected with a natural air suction pipeline, and an air suction cut-off valve is arranged on the natural air suction pipeline; along the air flow direction, an air flow meter and an air flow regulating valve are sequentially arranged on the blast main pipeline at the downstream of the natural air suction pipeline.
3. The system for realizing stable yield and high yield of dry quenching steam according to claim 1, wherein the combustible gas supply distribution system further comprises a main pipeline cut-off valve, a branch pipeline cut-off valve, a combustible gas flow regulating valve, a combustible gas flowmeter and a combustible gas pressure measuring device; along the flowing direction of the combustible gas, a combustible gas pressure measuring device, a combustible gas flowmeter, a main pipeline cut-off valve and a combustible gas flow regulating valve are sequentially arranged on a combustible gas main pipeline; the branch combustible gas pipeline is provided with a branch pipeline cut-off valve at one end close to the combustible gas distributor.
4. The system for realizing stable yield and high yield of dry quenching steam as claimed in claim 1, further comprising a nitrogen-filled protection and diffusion system; the nitrogen charging protection and diffusion system consists of a nitrogen main pipeline, a nitrogen branch pipe I, a nitrogen branch pipe II, a nitrogen branch pipe III, a nitrogen shutoff valve, a diffusion pipe and a diffusion valve; the combustible gas main pipeline is provided with a first nitrogen inlet at the downstream of the main pipeline cut-off valve, the combustible gas branch pipeline is provided with a second nitrogen inlet at the upstream of the branch pipeline cut-off valve, and the combustible gas distributor is provided with a third nitrogen inlet at the upstream of the combustible gas distributor; one end of the nitrogen main pipeline is connected with a nitrogen source, and the other end of the nitrogen main pipeline is respectively connected with a first nitrogen inlet through a first nitrogen branch pipe, a second nitrogen inlet through a second nitrogen branch pipe, and a third nitrogen inlet through a third nitrogen branch pipe; nitrogen shut-off valves are respectively arranged on the nitrogen branch pipe I, the nitrogen branch pipe II and the nitrogen branch pipe III; the diffusing pipe is arranged at the highest position of the combustible gas supply distribution system, and a diffusing valve is arranged on the diffusing pipe.
5. The system for realizing stable yield and high yield of dry quenching steam as claimed in claim 1, wherein a suction cut-off valve in the forced air blowing system is interlocked with a forced air blower.
6. The system for realizing stable yield and high yield of dry quenching steam as claimed in claim 1, wherein the combustible gas pressure measuring device in the combustible gas supply distribution system is controlled in an interlocking manner with a main pipeline cut-off valve and a branch pipeline cut-off valve.
7. The system for realizing stable yield and high yield of dry quenching steam as claimed in claim 1, wherein the forced air blower in the forced air blowing system is controlled by interlocking with a main pipeline cut-off valve and a branch pipeline cut-off valve in a combustible gas supply distribution system.
8. The system for realizing stable yield and high yield of dry quenching steam as claimed in claim 1, wherein the air flow regulating valve in the forced air blowing system and the combustible gas flow regulating valve in the combustible gas supply distribution system are connected with a steam flow meter arranged on a steam pipeline in the dry quenching boiler to form a negative feedback regulating system.
9. The method for realizing stable yield and high yield of dry quenching steam based on the system of any one of claims 1 to 8 is characterized by comprising the following steps:
the red hot high-temperature coke enters the dry quenching furnace from the top inlet of the dry quenching furnace, is in countercurrent contact with circulating gas blown from the bottom of the dry quenching furnace for heat exchange, the cooled coke is discharged from the bottom of the dry quenching furnace to finish dry quenching, and the heated circulating gas is discharged from the annular air duct outlet of the dry quenching furnace;
combustible gas sequentially flows through a combustible gas main pipeline, a combustible gas branch pipeline and a combustible gas distributor and enters a circulating gas outlet section of the dry quenching furnace, and meanwhile, ambient air is pressurized by a forced air blower and then enters an annular air duct of the dry quenching furnace through a blast main pipeline to provide combustion improver for the combustion of the combustible gas;
combustible gas, air and circulating gas of a dry quenching system are mixed together and are completely combusted in the process of flowing through the gravity settling dust remover, and waste gas generated by combustion and heat released by combustion reaction enter a dry quenching boiler along with the circulating gas; in a dry coke quenching boiler, circulating gas and boiler feed water are in countercurrent contact for heat exchange, the boiler feed water absorbs heat and is vaporized to generate high-temperature high-pressure or medium-temperature medium-pressure steam for a downstream working section to use, and the cooled circulating gas flows through a centrifugal force settling dust remover, is pressurized by a circulating fan, flows through a boiler feed water preheating device, and enters the dry coke quenching boiler from the bottom of the dry coke quenching boiler to exchange heat with coke;
the combustible gas flow regulating valve on the combustible gas main pipeline, the air flow regulating valve on the blast main pipeline and the steam flow meter on the steam pipeline in the dry quenching boiler are connected, the opening degrees of the combustible gas flow regulating valve and the air flow regulating valve are automatically controlled through the feedback of the steam flow meter, namely the supply quantity of combustible gas and air is adjusted, so that the heat supplied to the dry quenching boiler and the flow of circulating gas are adjusted, thereby eliminating the fluctuation of the steam yield of the dry quenching boiler, improving the steam yield and simultaneously ensuring the dry quenching system to operate in a designed load high-efficiency area; the adjustment process is as follows:
when the steam flow is in a descending trend, the opening degree of the combustible gas flow regulating valve and the air flow regulating valve is increased, namely the supply quantity of combustible gas and air is increased, so that the heat generated by combustion is increased, the heat transfer in the dry quenching boiler is increased, and the steam flow is increased; on the contrary, when the steam flow is in an ascending trend, the opening degree of the combustible gas flow regulating valve and the air flow regulating valve is reduced, namely the supply quantity of combustible gas and air is reduced, so that the heat generated by combustion is reduced, the heat transfer in the coke dry quenching boiler is reduced, and the steam flow is reduced;
meanwhile, the combustible gas flowmeter and the air flowmeter respectively record the supply amount of combustible gas and air, so that the adjustable quantitative supply of the combustible gas and the air is realized.
10. The method for realizing stable yield and high yield of the dry quenching steam as claimed in claim 9, wherein the dry quenching system is provided with safety protection measures; the method specifically comprises the following steps:
under normal working conditions, the air suction cut-off valve is in a closed state, when the forced air blower is stopped due to faults, the air suction cut-off valve is automatically opened, air enters the coke dry quenching gas circulation system in a natural suction mode to ensure air supply, and meanwhile, the main pipeline cut-off valve and the branch pipeline cut-off valve are automatically closed to stop supplying combustible gas to the gas circulation system, so that the system safety is ensured;
when the combustible gas pressure measuring device detects that the pressure of the combustible gas in the main combustible gas pipeline is continuously lower than a set value, the main pipeline cut-off valve and the branch pipeline cut-off valve are automatically closed, and the supply of the combustible gas to the dry quenching gas circulating system is stopped; and meanwhile, a nitrogen shutoff valve and a diffusion valve in the nitrogen-filled protection diffusion system are automatically opened, nitrogen enters the combustible gas main pipeline and the combustible gas branch pipeline, and combustible gas in the combustible gas main pipeline and the combustible gas branch pipeline is replaced and diffused to the environment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113322086A (en) * | 2021-06-29 | 2021-08-31 | 攀钢集团西昌钢钒有限公司 | Time delay method for controlling quality of externally supplied steam of dry quenching in sections |
| CN113429986A (en) * | 2021-07-05 | 2021-09-24 | 丰城市天壕新能源有限公司 | Dry quenching circulating gas explosion-proof equipment |
| CN113621390A (en) * | 2021-08-05 | 2021-11-09 | 新兴铸管股份有限公司 | Emergency nitrogen charging system for dry quenching furnace and control method |
| CN115418425A (en) * | 2022-09-28 | 2022-12-02 | 中冶南方都市环保工程技术股份有限公司 | Stable operation control method of multi-unit supercritical gas power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113322086A (en) * | 2021-06-29 | 2021-08-31 | 攀钢集团西昌钢钒有限公司 | Time delay method for controlling quality of externally supplied steam of dry quenching in sections |
| CN113429986A (en) * | 2021-07-05 | 2021-09-24 | 丰城市天壕新能源有限公司 | Dry quenching circulating gas explosion-proof equipment |
| CN113429986B (en) * | 2021-07-05 | 2022-03-18 | 丰城市天壕新能源有限公司 | Dry quenching circulating gas explosion-proof equipment |
| CN113621390A (en) * | 2021-08-05 | 2021-11-09 | 新兴铸管股份有限公司 | Emergency nitrogen charging system for dry quenching furnace and control method |
| CN113621390B (en) * | 2021-08-05 | 2022-04-29 | 新兴铸管股份有限公司 | Emergency nitrogen charging system for dry quenching furnace and control method |
| CN115418425A (en) * | 2022-09-28 | 2022-12-02 | 中冶南方都市环保工程技术股份有限公司 | Stable operation control method of multi-unit supercritical gas power generation system |
| CN115418425B (en) * | 2022-09-28 | 2023-09-29 | 中冶南方都市环保工程技术股份有限公司 | Stable operation control method of multi-unit supercritical gas power generation system |
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