CN113122289B - Pre-tempering treatment system and method for dry quenching furnace diffused gas - Google Patents
Pre-tempering treatment system and method for dry quenching furnace diffused gas Download PDFInfo
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- CN113122289B CN113122289B CN201911396569.3A CN201911396569A CN113122289B CN 113122289 B CN113122289 B CN 113122289B CN 201911396569 A CN201911396569 A CN 201911396569A CN 113122289 B CN113122289 B CN 113122289B
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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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- 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
- C10B41/00—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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Abstract
The amount of the flue gas discharged from the prestoring section of the coke dry quenching furnace is adjusted through the control of the combustion of the flue gas discharged from the prestoring section of the coke dry quenching furnace, the negative pressure control of a flue gas capture cover, the adjustment of the smoke temperature of the integrated discharged gas, the response to abnormal smoke temperature, the speed regulation of a desulfurization fan and the like, the components of the flue gas are changed after the full combustion, the safety risk that inflammable and explosive gas enters a dedusting and desulfurization system is eliminated, and CO and CH in the flue gas discharged from the tail end are eliminated4The flue gas temperature of the two parts of the diffused gas at the prestoring section and behind the circulating fan is adjusted according to the components, so that the dewing and acid corrosion of a dust remover are avoided, the desulfurization efficiency of the activated carbon is improved, and the ultra-clean emission of the tail end of the diffused gas of the dry quenching furnace is realized in a real sense.
Description
Technical Field
The invention relates to the technical field of coking environmental protection, in particular to a system and a method for pre-tempering of gas diffused by a dry quenching furnace, which are used for purifying the tail end of the gas diffused by the dry quenching furnace.
Background
With the development of the coking technology, coke quenching processes in the current coking production process are all provided with dry quenching furnaces, red coke is loaded from the tops of the dry quenching furnaces, low-temperature inert gas is blown into red coke layers of cooling sections of the dry quenching furnaces by circulating fans to absorb sensible heat of the red coke, and the cooled coke is discharged from the bottoms of the dry quenching furnaces. High-temperature inert gas from the annular flue of the dry quenching furnace flows through a dry quenching boiler for heat exchange to generate steam, the cooled inert gas is blown into the dry quenching furnace again by a circulating fan, and the inert gas is recycled in a closed system.
After the red coke is loaded into the dry quenching furnace, hydrogen, methane, carbon monoxide remained in the red coke and carbon monoxide generated by the reaction of carbon dioxide and the red coke in a high-temperature area enter a dry quenching circulating system, and the explosion risk exists when the carbon monoxide reaches a certain concentration. In order to realize the safe operation of the dry quenching gas circulation system, on one hand, combustible gas is discharged outside through pre-storage section diffusion, on the other hand, air is introduced into a primary dust removal part to burn the combustible gas, and in order to maintain the balance of the system, part of the circulating gas is diffused behind a circulating fan. The gas released by the pre-storage section of the dry quenching furnace is rich in combustible gas such as hydrogen, methane, carbon monoxide and the like, is directly sent to a filter bag for dedusting and then discharged, or is discharged after dedusting and then desulfurization, so that the explosion risk of a purification system exists, and the combustible gas which is not subjected to deep treatment is finally discharged to the atmosphere to cause certain environmental pollution.
The current coke dry quenching furnace diffused gas and the diffused gas after the circulating fan are combined and collected for treatment, and the coke dry quenching furnace is introduced for dust removal and then is discharged. In the last two years, with the implementation of the special emission limit value of atmospheric pollutants in the emission Standard of pollutants for coking chemical industry, the existing dry quenching dedusting SO2The overproof problem appears. Recently, a device for separating the dry quenching coke oven diffused gas with high sulfur concentration from the dry quenching coke dust removal total flue gas, then removing dust, desulfurizing, purifying and discharging is put into operation, and a process for introducing the diffused gas into a coke oven flue gas pipeline for mixing, then purifying and discharging is also provided.
The technology of introducing the diffused gas into the dry quenching dust removal treatment and then discharging only solves the problem of up-to-standard particulate matter discharge, and the mixing treatment of the diffused gas and the flue gas discharged from the dry quenching furnace reduces the concentration of combustible gas in the flue gas and can avoid explosion, which is also a method adopted by most enterprises at present, but cannot reach the ultralow discharge standard.
The technology of discharging the diffused gas after dedusting and desulfurization can solve the problem of standard discharge of particulate matters and sulfur dioxide, but the existing problems are also obvious. Taking a certain dry quenching diffused gas desulfurization device in China as an example, the problems that a smoke temperature low dust remover is subjected to dewing and acid corrosion, high-concentration combustible gas enters a subsequent system to cause burning and explosion hidden dangers, the concentration of carbon monoxide at a tail end discharge outlet is high, methane in flue gas causes large interference on analysis of sulfur dioxide gas and the like exist. In addition, the temperature of the flue gas after multi-point mixing is low, and the flue gas must be heated to realize certain flue gas desulfurization efficiency, so that the energy consumption is increased.
The introduction of the coke oven flue gas and flue gas combined purification process can solve the problem of standard emission of the tail end, but the whole system has long flow, the coke oven and the coke dry quenching have different operation modes, and the like, so that the stable and low-consumption operation of the system is influenced.
Disclosure of Invention
The invention aims to provide a system and a method for pre-tempering and treating the diffused gas of a coke dry quenching furnace, which can adjust the amount of the diffused flue gas in a prestoring section, change the components of the flue gas after full combustion, eliminate the safety risk of inflammable and explosive gas entering a dedusting and desulfurizing system, and eliminate CO and CH in the flue gas discharged from the tail end4The components are equal, the flue gas temperature of the pre-storage section and the flue gas temperature of the diffused gas of the back two parts of the circulating fan can be adjusted, the dewing and acid corrosion of a dust remover are avoided, the desulfurization efficiency of the activated carbon is improved, and the ultra-clean emission of the tail end of the diffused gas of the dry quenching furnace is realized in a real sense.
In order to achieve the purpose, the technical scheme of the invention is as follows:
dry coke quenching stove diffused gas is quenching and tempering processing system in advance, it includes: the pre-storage section of the dry quenching furnace is provided with a dispersion port and a pre-storage section dispersion pipeline, and the pre-storage section dispersion pipeline is sequentially provided with a dispersion water seal and a dispersion regulating valve; the smoke collecting cover is covered on the end part of the prestoring section diffusing pipeline; the smoke collecting cover is of a relatively closed box body structure, one side surface of the smoke collecting cover is provided with an observation hole for checking the combustion condition of the diffused gas, the side surface of the lower part of the smoke collecting cover is provided with a plurality of air supply pipes, the air supply pipes are upwards obliquely inserted, and the outlets of the air supply pipes correspond to the diffused gas outlet part of the pre-storage section of the diffused pipeline; the top of the flue gas trapping cover is connected to a desulfurizing tower through a flue gas main pipe and a dust remover, and a desulfurizing fan is arranged in an inlet pipeline of the desulfurizing tower; a flue gas adjusting turning plate, a main pipe smoke temperature and pressure detector and a doped cold air valve which can control the flow of trapped flue gas are sequentially arranged in the flue gas main pipe; the excitation igniter is arranged in the smoke trapping cover; the smoke temperature and pressure detector of the smoke collecting cover is arranged in the smoke collecting cover; the gas component detector is arranged in a coke dry quenching circulating gas air duct which connects the coke dry quenching furnace and the coke dry quenching boiler; the pre-storage section multi-point pressure gauge is arranged in the pre-storage section of the dry quenching furnace; the controller is electrically connected with the bleeding regulating valve, the desulfurization fan, the flue gas regulating turning plate, the dry pipe flue gas temperature and pressure detector, the doped cold air valve, the excitation igniter, the flue gas collecting cover flue gas temperature and pressure detector, the gas composition detector, the prestoring section multipoint pressure gauge and the dry quenching circulating gas circulating fan.
Preferably, two excitation igniters are provided.
Preferably, the lower part of the dust remover is connected with a heat-preservation steam regulating pipeline and a heat-preservation steam regulating valve on the heat-preservation steam regulating pipeline; the dust remover is internally provided with a chamber thermometer.
The invention relates to a processing method of a pre-quenching and tempering processing system for dry quenching furnace diffused gas, which comprises the following steps:
1) storage section diffused gas combustion
The method comprises the following steps that pre-storage section diffused gas and the diffused gas behind a circulating fan are regulated in a grouping mode, wherein the pre-storage section diffused gas enters a flue gas main pipe after being completely combusted, and the diffused gas behind the circulating fan is directly introduced into the flue gas main pipe; detecting the smoke temperature and pressure of the trapping cover, and performing complete combustion control on the air release quantity of the pre-storage section;
when the coke is not charged with red coke, the coke is quenched with H in the circulating gas2When the content exceeds 2%, opening a pre-storage section diffusion regulating valve, and simultaneously exciting an igniter to excite ignition, so that combustible gas in the pre-storage section diffusion gas is combusted and is trapped by a flue gas trapping cover; if the temperature of the smoke in the smoke trapping cover does not reach 200 ℃ or above, continuously exciting ignition, and closing the opening of the diffusing regulating valve until the opening is minimum; opening of diffusion regulating valveThe reduction process adopts step adjustment, and the excitation igniter is closed until the smoke temperature of the smoke trapping cover exceeds 200 ℃; when the smoke temperature of the smoke collecting cover is continuously lower than 150 ℃, the diffusing air quantity is not enough to support combustion, and the diffusing regulating valve is closed;
2) flue gas capture hood negative pressure control
The pressure detection is configured in the flue gas collecting cover, the flow of collected flue gas is controlled through a flue gas adjusting turnover plate arranged on a flue gas main pipe, and the closed-loop adjustment of negative pressure in the flue gas collecting cover is realized;
when the pressure in the flue gas collecting cover is higher than-10 Pa, opening a flue gas adjusting turnover plate;
when the pressure in the flue gas collecting cover is less than-40 Pa, the flue gas adjusting turnover plate is turned down;
3) smoke temp. regulation for integrated diffused gas
After being combusted, the pre-stored section diffused gas is mixed with the diffused gas coming from the circulating fan in the flue gas main pipe and then enters a dust remover for dust removal; and when the smoke temperature exceeds 200 ℃, the cold air mixing valve is opened to mix cold air into the smoke in order to avoid the damage of high temperature to a subsequent dust remover and a desulfurizing tower.
Further, the method also comprises the following steps of adjusting the rotating speed of the desulfurization fan:
the rotating speed of the desulfurization fan is controlled by the negative pressure of the flue gas main pipe, so that the flue gas main pipe is always in a relatively stable pressure environment, and the diffused gas is completely collected;
when the flue gas pressure of the flue gas main pipe is more than 500Pa, the speed of the desulfurization fan is increased;
when the flue gas pressure of the flue gas main pipe is less than 1000Pa, the desulfurization fan decelerates.
And, also include the pressure balance control of the loading state:
a rear diffusing regulating valve of the circulating fan is opened and locked; in a non-loading state, the pressure of a prestoring section is controlled to be zero pressure, when a loading signal of the dry quenching furnace arrives, a diffusing regulating valve behind a circulating fan is opened by 10% under the current opening degree and locked until red coke loading is finished, and a closing signal of a furnace cover of the dry quenching furnace arrives; in the red coke loading process, the back diffusion quantity of the circulating fan is not adjusted;
closing and locking a pre-storage section diffusion regulating valve; when the dry quenching furnace loading signal arrives, the prestoring segment diffusion regulating valve is closed to the minimum opening degree and locked until the dry quenching furnace loading signal disappears, and simultaneously H in the dry quenching furnace circulating gas2When the content exceeds 2%, the pre-storage section diffusion regulating valve is opened again, and ignition and combustion are triggered.
Preferably, after the igniter is excited for a certain time, and the smoke temperature of the trapping cover still cannot reach the standard, an ignition failure alarm is output, and the diffusing regulating valve is closed.
Preferably, the pre-storage section diffusion regulating valve is provided with a minimum opening degree, and the pre-storage section diffusion water seal ensures that the dry quenching system can emergently diffuse combustible gas under emergency conditions.
Preferably, the cold air mixing valve is independently controlled and is automatically closed after being opened for more than 8 seconds.
Preferably, the dust remover bin is provided with a coil pipe type steam heat preservation device, low-pressure steam is adopted for heat preservation, and the steam quantity is adjusted according to the temperature of the bin; when the temperature of the bin is lower than 120 ℃, starting steam for heat preservation; and when the temperature is higher than 150 ℃, closing the steam flow regulating valve until the steam flow regulating valve is completely closed.
Preferably, the pressure measurement of the pre-storage section of the dry quenching furnace adopts a multipoint annular pressure measuring meter.
The invention relates to a system and a method for pre-quenching and tempering treatment of gas diffused by a dry quenching furnace, wherein the system comprises the following steps:
1. prestoring section diffused gas combustion
The pre-storage section diffused gas and the diffused gas behind the circulating fan are regulated in a grouping mode, wherein the diffused gas in the pre-storage section enters the flue gas main pipe after being completely combusted, and the diffused gas behind the circulating fan is directly introduced into the flue gas main pipe. The pre-storage section diffusion pipeline is provided with a diffusion regulating valve, a diffusion water seal, a smoke trapping cover, an excitation igniter and a smoke regulating turning plate, the smoke temperature and the smoke pressure of the trapping cover are detected, and the complete combustion control of the pre-storage section diffusion air quantity is carried out.
When the coke is not charged with red coke, the coke is quenched with H in the circulating gas2When the content exceeds 2%, the pre-storage section diffusion regulating valve is opened, and the igniter is simultaneously excited to ignite so as to realize pre-storageCombustible gas in the section diffused gas is combusted and is trapped by the smoke trapping cover. If the smoke temperature in the smoke trapping cover does not reach 200 ℃ or above, ignition is continuously activated, and the opening of the diffusion regulating valve is reduced until the minimum opening is reached. The process system of reducing the opening of the diffusing regulating valve is automatically carried out in a step mode until the smoke temperature of the smoke trapping cover exceeds 200 ℃, and the exciting igniter is closed. When the smoke temperature of the smoke collecting cover is continuously lower than 150 ℃, the diffusing air quantity is not enough to support combustion, and the diffusing regulating valve is closed.
2. Flue gas capture hood negative pressure control
The pressure detection is arranged in the flue gas collecting cover, the flow of collected flue gas is controlled by a flue gas adjusting turnover plate arranged on the flue gas main pipe, and the closed-loop adjustment of the negative pressure in the flue gas collecting cover is realized. When the pressure in the smoke collecting cover is < -10Pa, the smoke adjusting turning plate is opened, and when the pressure in the smoke collecting cover is < -40Pa, the smoke adjusting turning plate is closed. The flue gas trapping cover is of a relatively closed box structure, and an observation hole is reserved in the side face of the flue gas trapping cover and used for checking the combustion condition of the diffused gas. The side surface of the smoke trapping cover is provided with a plurality of air supply pipes which are upwards inserted obliquely to the outlet part of the diffused gas, so that the air and the diffused combustible gas can be fully contacted and then combusted. The exciting igniter and the temperature and pressure detecting device in the fume trapping hood are arranged in the hood.
3. Smoke temp. regulation for integrated diffused gas
The pre-stored section diffused gas is mixed with the diffused gas coming from the circulating fan in the flue gas main pipe after being combusted, and then the mixed gas enters the bag type dust collector for dust removal. Before the flue gas main pipe enters the dust remover, a cold air mixing valve is arranged, a galvanic couple is arranged to detect the flue gas temperature of the flue gas main pipe on line, and when the flue gas temperature exceeds 200 ℃, the cold air mixing valve is opened to mix cold air in order to avoid the damage of high temperature to the subsequent dust remover and the desulfurizing tower. The mixing cold air valve is independently controlled and is automatically closed after being opened for 10 seconds. The dust remover bin is provided with a coil pipe type steam heat preservation facility, low-pressure steam is adopted for heat preservation, and the steam quantity is automatically adjusted according to the temperature of the bin. When the temperature of the bin is lower than 120 ℃, the steam is opened (increased) for heat preservation, and when the temperature is higher than 150 ℃, the steam flow regulating valve is closed until the steam is completely closed.
4. Rotational speed adjustment of desulfurization fan
The dry quenching diffused gas desulfurization system is provided with a variable frequency fan, the rotating speed of the fan is controlled by the negative pressure of the flue gas main pipe, the flue gas main pipe is ensured to be always in a relatively stable pressure environment, and the diffused gas is completely collected. When the flue gas pressure of the main pipe is more than 500Pa, the speed of the desulfurization fan is increased, and when the flue gas pressure of the flue gas main pipe is less than 1000Pa, the speed of the desulfurization fan is reduced.
And the on-site control unit is configured for smoke temperature and pressure detection of the smoke trapping cover, pre-storage section pressure detection, circulating gas component detection, dust remover bin temperature detection, smoke temperature and pressure detection of the smoke main pipe, and control of the pre-storage section diffusing turning plate, the excitation igniter, the smoke temperature of the smoke main pipe, cold air doping and other mechanism units.
5. Load state pressure balance control
The pressure in the coke dry quenching furnace is greatly fluctuated in the red coke loading process, and the following technology is adopted for realizing the pressure balance control of the whole system:
firstly, the back diffusion regulating valve of the circulating fan is opened and locked. In a non-loading state, the pressure of the prestoring section is controlled to be zero pressure, when a loading signal of the dry quenching furnace arrives, the rear diffusing regulating valve of the circulating fan is opened by 10 percent under the current opening degree and locked until the red coke loading is finished, and a closing signal of the furnace cover of the dry quenching furnace arrives. In the red coke loading process, the back diffusion quantity of the circulating fan is not adjusted.
And secondly, closing and locking the pre-storage section diffusion regulating valve. When the dry quenching furnace loading signal arrives, the prestoring segment diffusion regulating valve is closed to the minimum opening degree and locked until the dry quenching furnace loading signal disappears, and simultaneously H in the dry quenching furnace circulating gas2When the content exceeds 2%, the pre-storage section diffusion regulating valve is opened, and ignition and combustion are triggered.
The purpose of the diffusion of the pre-storage section of the dry quenching furnace is to discharge combustible gas such as hydrogen, carbon monoxide, methane and the like enriched in the pre-storage section, avoid possible explosion of a dry quenching circulating system and realize the safe red coke loading of the dry quenching furnace. The invention controls the concentration of combustible gas of the pre-storage section diffused gas to ensure that the combustible gas is stably ignited and combusted, converts the combustible gas into flue gas which can be processed in the subsequent process, heats the flue gas by the heat generated by combustion, meets the requirement of high-efficiency desulfurization reaction after heat is supplemented, and adopts a series of temperature and pressure measures to realize the stable pressure operation of the system under the working conditions of red coke loading, the pre-storage section diffused gas combustion process and the like.
The system for pre-conditioning the gas diffused by the dry quenching furnace regulates and ignites the diffused gas quantity of the pre-storage section enriched with combustible gas by grouping the diffused gas of the dry quenching furnace, so that the gas is converted into CO after being completely combusted2、H2And O, the gas collecting hood is closed to keep the suction stable, the gas collecting hood is mixed with the diffused gas behind the circulating fan to adjust the temperature, and the system is regulated in a stable pressure state when the gas collecting hood is in a loading state, so that dew formation and acid corrosion are avoided, the desulfurization reaction temperature of the activated carbon is met, higher desulfurization efficiency, safer process control, more reliable equipment operation and lower pollutant discharge are realized.
The invention has the beneficial effects that:
1) the invention realizes the conversion of smoke components of the pre-stored section of the diffused gas, can eliminate the explosion risk of combustible gas to subsequent equipment, and avoids CO and CH in the tail end exhaust funnel4And the discharge of gases is equal, so that the requirement of ultralow emission is better met.
2) The invention utilizes the heat generated by combustion and is assisted with steam for heat preservation, thereby realizing the adjustment of the smoke temperature, not only avoiding the generation of dew point corrosion, but also achieving the optimal reaction temperature of the subsequent active carbon desulfurization and higher desulfurization efficiency.
3) The balance control measures of the system in the red coke loading state not only meet the environment-friendly requirement of the dry quenching furnace for smokeless coke loading, but also avoid the interference of pressure fluctuation on the flue gas desulfurization and purification treatment.
4) The suction of the smoke trapping cover is adjusted to realize reliable collection of the released gas under the condition that the released gas amount in the prestoring section is unstable, and smoke escape is avoided.
5) The combined application of technologies such as a diffusion gas water seal, the minimum opening degree of a diffusion valve, cold air doping and the like ensures that the whole system can still run safely and reliably under emergency conditions.
Drawings
FIG. 1 is a schematic structural view of a system for pre-quenching and tempering a gas discharged from a dry quenching furnace according to the present invention.
Fig. 2 is a partially enlarged schematic view of fig. 1.
In the figure, 10 dry quenching furnaces, 101-a dry quenching furnace pre-storage section, 102-a dry quenching furnace cooling section, 103-a dry quenching furnace discharging section, 104-a dry quenching furnace pre-storage section diffusing port, 105-a pre-storage section diffusing pipeline, 106-a diffusing water seal and F1 diffusing regulating valves are arranged; 20. a dry quenching boiler; 30. a flue gas outlet duct of the dry quenching furnace; 40. a dry quenching circulating gas duct; 50. a dry quenching circulating gas circulating fan.
1 flue gas trapping cover, 2 air supply pipe, 3 flue gas main (31 circulating fan back diffusion gas interflow interface), 4 dust remover (41 heat preservation steam regulation pipeline, 42 cabin thermometer), 5 desulfurizing tower (51 aiutage), 6 desulfurizing fan, 7 flue gas regulation turning plate, 8 main pipe flue gas temperature pressure detector, 9 mix cold air valve, 10 arouse some firearm, 11 flue gas trapping cover smoke temperature, pressure detector, 12 gas composition detector, 13 prestore section multipoint manometer, 14 controller, F1 diffusion regulating valve, F2 heat preservation steam regulating valve.
Detailed Description
Referring to fig. 1 and 2, the system for pretreating and tempering the dry quenching furnace exhaust gas comprises:
a pre-storage section 101 of the dry quenching furnace 10 is provided with a relief port 104 and a pre-storage section relief pipeline 105, and the pre-storage section relief pipeline 105 is sequentially provided with a relief water seal 106 and a relief regulating valve F1;
the smoke collecting cover 1 is covered on the outer end part of the prestoring section diffusing pipeline 105; the flue gas collecting cover 1 is of a relatively closed box structure, one side surface of the flue gas collecting cover is provided with an observation hole for checking the combustion condition of the diffused gas, the side surface of the lower part of the flue gas collecting cover 1 is provided with a plurality of air supply pipes 2, the air supply pipes 2 are inserted upwards in an inclined way, and the outlets of the air supply pipes correspond to the diffused gas outlet parts of the pre-storage section diffusing pipeline 105; the top of the flue gas collecting hood 1 is connected to a desulfurizing tower 5 through a flue gas main pipe 3 and a dust remover 4, and a desulfurizing fan 6 is arranged in an inlet pipeline of the desulfurizing tower 5; a flue gas adjusting turning plate 7 capable of controlling the flow of trapped flue gas, a flue gas temperature and pressure detector 8 of the main pipe and a doped cold air valve 9 are sequentially arranged in the flue gas main pipe 3;
an excitation igniter 10 disposed in the flue gas collecting cover 1;
the smoke temperature and pressure detector 11 of the smoke trapping cover is arranged in the smoke trapping cover 1;
a gas component detector 12 disposed in a dry quenching circulating gas duct 40 connecting the dry quenching furnace 10 and the dry quenching boiler 20;
the pre-storage section multipoint pressure gauge 13 is arranged in the pre-storage section 101 of the coke dry quenching furnace;
and the controller 14 is electrically connected with the bleeding regulating valve, the desulfurization fan, the flue gas regulating turning plate, the dry pipe flue gas temperature and pressure detector, the doped cold air valve, the excitation igniter, the flue gas temperature of the flue gas collecting cover, the pressure detector, the gas component detector, the prestoring section multipoint pressure gauge and the dry quenching circulating gas circulating fan.
Two excitation igniters 10 are provided.
The lower part of the dust remover 4 is connected with a heat-preservation steam regulating pipeline 41 and an upper heat-preservation steam regulating valve F2 thereof; a chamber thermometer 42 is arranged in the dust remover 4.
The invention relates to a processing method of a coke dry quenching furnace diffused gas pre-quenching and tempering processing system, which comprises the following steps:
1) storage section diffused gas combustion
Pre-storage section diffused gas and the diffused gas behind the circulating fan are regulated in a grouping mode, wherein the diffused gas in the pre-storage section enters the flue gas main pipe after being completely combusted, and the diffused gas behind the circulating fan is directly introduced into the flue gas main pipe; detecting the smoke temperature and pressure of the trapping cover, and performing complete combustion control on the pre-stored section of the released air quantity;
when the coke is not charged with red coke, the coke is quenched with H in the circulating gas2When the content exceeds 2%, opening a pre-storage section diffusion regulating valve, and simultaneously exciting an igniter to excite ignition, so that combustible gas in the pre-storage section diffusion gas is combusted and is trapped by a flue gas trapping cover; if the temperature of the smoke in the smoke trapping cover does not reach 200 ℃ or above, continuously exciting ignition, and closing the opening of the diffusing regulating valve until the opening is minimum; the opening of the diffusion regulating valve is reduced in a stepped mode until the smoke temperature of the smoke collecting cover exceeds 200 ℃, and the excitation igniter is closed; when the smoke temperature of the smoke collecting cover is continuously lower than 150 ℃, the diffusing air quantity is not enough to support combustion, and the diffusing regulating valve is closed;
2) flue gas capture hood negative pressure control
The pressure detection is configured in the flue gas collecting cover, the flow of collected flue gas is controlled through a flue gas adjusting turnover plate arranged on a flue gas main pipe, and the closed-loop adjustment of negative pressure in the flue gas collecting cover is realized;
when the pressure in the flue gas collecting cover is higher than-10 Pa, opening a flue gas adjusting turning plate;
when the pressure in the smoke trapping cover is less than-40 Pa, the smoke adjusting turning plate is turned down;
3) smoke temp. regulation for integrated diffused gas
After being combusted, the pre-stored section diffused gas is mixed with the diffused gas coming from the circulating fan in the flue gas main pipe and then enters a dust remover for dust removal; and when the smoke temperature exceeds 200 ℃, the cold air mixing valve is opened to mix cold air into the smoke in order to avoid the damage of high temperature to a subsequent dust remover and a desulfurizing tower.
Further, the method also comprises the following steps of adjusting the rotating speed of the desulfurization fan:
the rotating speed of the desulfurization fan is controlled by the negative pressure of the flue gas main pipe, so that the flue gas main pipe is always in a relatively stable pressure environment, and the diffused gas is completely collected;
when the flue gas pressure of the flue gas main pipe is more than 500Pa, the speed of the desulfurization fan is increased;
when the flue gas pressure of the flue gas main pipe is less than 1000Pa, the desulfurization fan decelerates.
Further, the method comprises the following steps of:
the back diffusion regulating valve of the circulating fan is opened and locked; in a non-loading state, the pressure of a prestoring section is controlled to be zero pressure, when a loading signal of the dry quenching furnace arrives, a diffusing regulating valve behind a circulating fan is opened by 10% under the current opening degree and locked until red coke loading is finished, and a closing signal of a furnace cover of the dry quenching furnace arrives; in the red coke loading process, the back diffusion quantity of the circulating fan is not adjusted;
closing and locking the prestoring section diffusion regulating valve; when the dry quenching furnace loading signal arrives, the prestoring section diffusion regulating valve is closed to the minimum opening degree and locked until the dry quenching furnace loading signal disappears, and simultaneously H in the dry quenching furnace circulating gas2When the content exceeds 2 percent, the pre-storage section is opened to release the regulating valve, andand (4) igniting and burning.
Preferably, after the igniter is excited for a certain time, the smoke temperature of the trapping cover still cannot reach the standard, an ignition failure alarm is output, and the diffusion regulating valve is closed.
Preferably, the pre-storage section diffusion regulating valve is provided with a minimum opening degree, and the pre-storage section diffusion water seal ensures that the dry quenching system can emergently diffuse the combustible gas under emergency.
Preferably, the mixing cold air valve is independently controlled and is automatically closed after being opened for more than 8 seconds.
Preferably, the dust remover bin is provided with a coil pipe type steam heat preservation device, low-pressure steam is adopted for heat preservation, and the steam quantity is adjusted according to the temperature of the bin; when the temperature of the bin is lower than 120 ℃, starting steam for heat preservation; and when the temperature is higher than 150 ℃, closing the steam flow regulating valve until the steam flow regulating valve is completely closed.
Preferably, the pressure measurement of the pre-storage section of the dry quenching furnace adopts a multipoint annular pressure measuring meter.
The problem that sulfur dioxide in flue gas exceeds standard is a public secret as a main discharge port, and the flue gas can be discharged after being subjected to desulfurization and purification treatment. The invention is used as a necessary measure of an independent dry quenching diffused gas dedusting and desulfurizing process, and has very wide popularization and application prospect.
Claims (10)
1. The system for pre-quenching and tempering the gas diffused by the dry quenching furnace is characterized by comprising the following components:
the pre-storage section of the dry quenching furnace is provided with a release port and a pre-storage section release pipeline, and the pre-storage section release pipeline is sequentially provided with a release water seal and a release regulating valve;
the smoke collecting cover is covered at the end part of the pre-storage section diffusing pipeline; the smoke collecting cover is of a relatively closed box body structure, one side face of the smoke collecting cover is provided with an observation hole for checking the combustion condition of the diffused gas, the side face of the lower part of the smoke collecting cover is provided with a plurality of air supply pipes, the air supply pipes are inserted upwards in an inclined mode, and the outlets of the air supply pipes correspond to the diffused gas outlet parts of the pre-storage section diffused pipelines; the top of the flue gas collecting hood is connected to a desulfurizing tower through a flue gas main pipe and a dust remover, and a desulfurizing fan is arranged in an inlet pipeline of the desulfurizing tower; a flue gas adjusting turning plate capable of controlling the flow of trapped flue gas, a flue gas temperature and pressure detecting meter of the main pipe and a doped cold air valve are sequentially arranged in the flue gas main pipe;
the excitation igniter is arranged in the smoke trapping cover;
the smoke temperature and pressure detector of the smoke collecting cover is arranged in the smoke collecting cover;
the gas component detector is arranged in a dry quenching circulating gas duct connecting the dry quenching furnace and the dry quenching boiler;
the pre-storage section multipoint manometer is arranged in the pre-storage section of the coke dry quenching furnace;
the controller, diffuse governing valve, desulfurization fan, flue gas regulation board, dry pipe smoke temperature, pressure detection meter, mix the cold air valve, arouse some firearms, flue gas entrapment cover smoke temperature, pressure detection meter, gas composition detector, prestore section multiple spot manometer, dry coke quenching circulation gas circulation fan equal electric connection this controller.
2. The system for the pre-conditioning of dry quenching oven purge gas of claim 1, wherein there are two said igniter.
3. The system for pretreating and tempering coke dry quenching oven effluent gas of claim 1, wherein the lower portion of the dust remover is connected with a heat-insulating steam regulating pipeline and a heat-insulating steam regulating valve thereon; the dust remover is internally provided with a chamber thermometer.
4. The processing method of the system for pretreating and tempering coke dry quenching furnace exhaust gas according to claim 1, wherein the processing method comprises the following steps: the method comprises the following steps:
1) storage section diffused gas combustion
Pre-storage section diffused gas and the diffused gas behind the circulating fan are regulated in a grouping mode, wherein the diffused gas in the pre-storage section enters the flue gas main pipe after being completely combusted, and the diffused gas behind the circulating fan is directly introduced into the flue gas main pipe; detecting the smoke temperature and pressure of the trapping cover, and performing complete combustion control on the pre-stored section of the released air quantity;
when the coke is not charged in red, the coke is dry quenched in the circulating gas H2When the content exceeds 2%, opening a pre-storage section diffusion regulating valve, and simultaneously exciting an igniter to excite ignition, so that combustible gas in the pre-storage section diffusion gas is combusted and is trapped by a flue gas trapping cover; if the temperature of the smoke in the smoke trapping cover does not reach 200 ℃ or above, continuously exciting ignition, and closing the opening of the diffusing regulating valve until the opening is minimum; the opening of the diffusion regulating valve is reduced in a stepped mode, and the excitation igniter is closed until the smoke temperature of the smoke trapping cover exceeds 200 ℃; when the smoke temperature of the smoke collecting cover is continuously lower than 150 ℃, the diffusing air quantity is not enough to support combustion, and the diffusing regulating valve is closed;
2) flue gas capture hood negative pressure control
The pressure detection is configured in the flue gas collecting cover, the flow of collected flue gas is controlled by a flue gas adjusting turnover plate arranged on a flue gas main pipe, and the closed-loop adjustment of negative pressure in the flue gas collecting cover is realized;
when the pressure in the flue gas collecting cover is higher than-10 Pa, opening a flue gas adjusting turning plate;
when the pressure in the smoke trapping cover is less than-40 Pa, the smoke adjusting turning plate is turned down;
3) smoke temp. regulation for integrated diffused gas
After being combusted, the pre-stored section diffused gas is mixed with the diffused gas coming from the circulating fan in the flue gas main pipe and then enters a dust remover for dust removal; the mixing cold air valve is arranged before the flue gas main pipe enters the dust remover, the flue gas temperature of the flue gas main pipe is detected on line, and when the flue gas temperature exceeds 200 ℃, the mixing cold air valve is opened to mix cold air in order to avoid the damage of high temperature to the follow-up dust remover and the desulfurizing tower.
5. The process of claim 4 wherein: the method also comprises the following steps of adjusting the rotating speed of the desulfurization fan:
the rotating speed of the desulfurization fan is controlled by the negative pressure of the flue gas main pipe, so that the flue gas main pipe is always in a relatively stable pressure environment, and the complete collection of the diffused gas is realized;
when the flue gas pressure of the flue gas main pipe is more than 500Pa, the speed of the desulfurization fan is increased;
when the flue gas pressure of the flue gas main pipe is less than 1000Pa, the desulfurization fan decelerates.
6. The process of claim 4 wherein: further comprising a load state pressure balance control:
the back diffusion regulating valve of the circulating fan is opened and locked; in a non-loading state, the pressure of a prestoring section is controlled to be zero pressure, when a loading signal of the dry quenching furnace arrives, a back diffusion regulating valve of a circulating fan is increased by 10 +/-3% under the current opening degree, and the dry quenching furnace is locked until the red coke loading is finished and a closing signal of a furnace cover of the dry quenching furnace arrives; in the red coke loading process, the back diffusion quantity of the circulating fan is not adjusted;
closing and locking the prestoring section diffusion regulating valve; when the dry quenching furnace loading signal arrives, the prestoring section diffusion regulating valve is closed to the minimum opening degree and locked until the dry quenching furnace loading signal disappears, and simultaneously H in the dry quenching furnace circulating gas2When the content exceeds 2%, the pre-storage section diffusion regulating valve is opened, and ignition and combustion are triggered.
7. The process of claim 4 wherein: after the igniter is excited for a certain time, the smoke temperature of the trapping cover still cannot reach the standard, an ignition failure alarm is output, and the diffusing regulating valve is closed.
8. The process of claim 4 wherein: the pre-storage section diffusion regulating valve is provided with a minimum opening degree, and the pre-storage section diffusion water seal ensures that the dry quenching system can emergently diffuse combustible gas under emergency.
9. The process of claim 4 wherein: the lower part of the dust remover is connected with a heat-preservation steam regulating pipeline and a heat-preservation steam regulating valve on the heat-preservation steam regulating pipeline; a bin thermometer is arranged in the dust remover, a coil type steam heat preservation device is arranged in the dust remover bin, low-pressure steam is adopted for heat preservation, and the steam quantity is adjusted according to the temperature of the bin; when the temperature of the bin is lower than 120 ℃, starting steam for heat preservation; and when the temperature is higher than 150 ℃, closing the steam flow regulating valve until the steam flow regulating valve is completely closed.
10. The process of claim 4 wherein: and the pressure measurement of the pre-storage section of the dry quenching furnace adopts a multipoint annular pressure gauge.
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