CN113122290B - Method for treating commonly used diffused gas of dry quenching furnace - Google Patents
Method for treating commonly used diffused gas of dry quenching furnace Download PDFInfo
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- CN113122290B CN113122290B CN201911400993.0A CN201911400993A CN113122290B CN 113122290 B CN113122290 B CN 113122290B CN 201911400993 A CN201911400993 A CN 201911400993A CN 113122290 B CN113122290 B CN 113122290B
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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
Abstract
A method for processing commonly used diffused gas of a dry quenching furnace is characterized in that a part of flue gas is introduced into a flue gas outlet air duct of the dry quenching furnace through a flue gas pipeline, hot flue gas in a pre-storage section zero pressure state is naturally sucked to a dry quenching furnace outlet (namely a boiler inlet) by means of negative pressure suction in front of a dry quenching circulating fan, and the hot flue gas is rapidly combusted and converted into heat after being contacted with air introduced from the part and enters a dry quenching furnace system for recycling, so that the source collection and the recycling of the commonly used diffused gas of the dry quenching furnace are realized. The invention solves the defects and shortcomings of the existing purification treatment of the diffused gas of the dry quenching furnace, not only eliminates the pollutant emission source of the commonly used diffused gas in the prestore section of the dry quenching furnace from the source, but also improves the generation amount of the dry quenching steam by the heat released by the combustion of the combustible gas after the combustion, and is environment-friendly and economical.
Description
Technical Field
The invention relates to the technical field of coking environmental protection, in particular to a method for treating commonly used diffused gas of a dry quenching furnace.
Background
With the development of a coking technology, coke quenching equipment is configured in a coke quenching procedure in the current coking production process, red coke is loaded from the top of a dry quenching furnace, low-temperature inert gas is blown into a red coke layer of a cooling section of the dry quenching furnace by a circulating fan to absorb sensible heat of the red coke, the cooled coke is discharged from the bottom of the dry quenching furnace, high-temperature inert gas discharged from an annular flue of the dry quenching furnace flows through a dry quenching process boiler to carry out heat exchange, the boiler generates 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 put into the coke dry quenching furnace, hydrogen, methane and carbon monoxide remained in the red coke and carbon monoxide generated by the reaction of the remaining carbon dioxide and the red coke in a high-temperature area all enter a coke dry quenching circulating system, so that the explosion risk exists. In order to realize the safe operation of the dry quenching gas circulation system, on one hand, combustible gas is discharged outside through common emission of a pre-storage section, on the other hand, air is introduced into a primary dedusting part to combust the combustible gas, and in order to maintain the balance of the system, part of the circulating gas is emitted after a circulating fan. The common diffused gas in the prestorage 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 commonly used diffused gas of the present dry quenching furnace is combined with the diffused gas after a circulating fan for collection and treatment, and the diffused gas is introduced into the dry quenching furnace for dust removal and then discharged, or is discharged after dust removal and desulfurization, or is introduced into a flue of the coke furnace, and is mixed with the flue gas after the combustion of the coke furnace and then discharged after desulfurization and purification treatment. The technology of introducing the diffused gas into the dry quenching dust removal treatment and then discharging the diffused gas only solves the problem of up-to-standard particulate matter discharge, and the diffused gas is mixed with the flue gas discharged from the dry quenching furnace to reduce the concentration of combustible gas in the flue gas and avoid explosion, which is a method adopted by most enterprises at present and cannot reach the ultralow emission standard. The technology that discharges after will diffusing gas removes dust, the desulfurization can solve particulate matter, sulfur dioxide discharge to reach standard problem, nevertheless has the hidden danger of blasting that highly enriched combustible gas got into the system and bring, and end row mouth carbon monoxide concentration is high, and methane also causes great interference to sulfur dioxide gas analysis in the flue gas. The introduction of the coke oven flue gas combined flue gas purification process can solve the problem of tail end up-to-standard emission, but the whole system has long flow, the coke oven and the dry quenching operation have different modes, and the mutual interference exists, thereby influencing the stable and low-consumption operation of the system.
Disclosure of Invention
The invention aims to provide a method for treating commonly used diffused gas of a dry quenching furnace, which overcomes the defects and shortcomings of the purification treatment of the diffused gas of the conventional dry quenching furnace, not only eliminates the pollutant emission source of the commonly used diffused gas of the prestorage section of the dry quenching furnace from the source, but also improves the generation amount of dry quenching steam by the heat released by the combustion of combustible gas after the coke is recycled, and is environment-friendly and economical.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for treating commonly used diffused gas of a dry quenching furnace comprises the following steps:
1) introduction of commonly used diffused gas in prestoring section of dry quenching furnace
A pre-storage section emergency relief valve is arranged in a common relief pipe corresponding to a common relief port of a pre-storage section of the dry quenching furnace, and an emergency relief water seal is arranged in an outlet section of the common relief pipe; a return circulating gas communicating pipe and a corresponding common diffused gas regulating valve are arranged between the common diffusing pipe and a flue gas outlet air duct of the dry quenching furnace, one end of the return circulating gas communicating pipe is connected with the common diffusing pipe, the other end of the return circulating gas communicating pipe extends into the flue gas outlet air duct of the dry quenching furnace, the end of the return circulating gas communicating pipe is provided with a common diffused gas return distributing pipe, the common diffused gas return distributing pipe is of at least more than two multi-pipe structures and is horizontally arranged, and the outlet of the common diffused gas return distributing pipe points to the flow direction of the circulating gas at the part;
a pre-storage section pressure detector is arranged in the pre-storage section of the dry quenching furnace; a dry quenching furnace outlet temperature pressure detector is arranged in the flue gas outlet air duct of the dry quenching furnace; the pre-storage section emergency relief valve, the common relief gas regulating valve, the pre-storage section pressure detector and the dry quenching furnace outlet temperature pressure detector are all connected to a field control unit, and the field control unit is connected to a central monitoring unit for coking production;
under the normal operation state, the pressure at the outlet air duct of the dry quenching furnace is negative pressure which exceeds-1000 Pa, the pressure of the prestoring section is zero pressure +/-50 Pa, the thermal buoyancy of a return circulating gas connecting pipe is overcome by means of the pressure difference between a prestoring section release port and the flue gas outlet air duct of the dry quenching furnace, and the prestoring section release gas is introduced into the flue gas outlet air duct of the dry quenching furnace; the part is introduced with air and is under the high temperature condition, common diffused gas is fully combusted once entering, and the common diffused gas is converted into heat to be supplied to a dry quenching boiler for recycling;
2) common purge gas introduction regulation
Before red coke is loaded, closing a common diffused gas regulating valve and locking, and regulating the pressure of a prestoring section to be more than-30 Pa so as to resist pressure fluctuation caused by hot air replaced by red coke in the red coke loading process and avoid the escape of flue gas loaded into a furnace mouth; after the red coke is loaded and the furnace cover is closed, the pressure of the prestoring section is restored to zero pressure +/-50 Pa, and the common diffused gas regulating valve is unlocked to restore the normal regulating state.
Preferably, when the pre-storage section emergency relief water seal and the pre-storage section emergency relief valve have a dry quenching circulating gas circulating system decompression fault and the content of combustible gas in the circulating system is abnormally increased, the pre-storage section emergency relief valve is opened, and the pre-storage section emergency relief pipe performs emergency relief to ensure the safety state of the dry quenching circulating system.
Preferably, when the dry quenching furnace is in a non-loading state, the pressure of a pre-storage section of the dry quenching furnace exceeds 500Pa, the dry quenching furnace is remotely opened by a central monitoring unit, and the height of a water seal of an emergency relief water seal is set to be 50mmH2Water column O should be used for abnormal emission.
Preferably, according to the detection of the temperature and the pressure of the outlet of the dry quenching furnace, when the temperature exceeds the set value of the temperature of the inlet of the boiler by 20 +/-10 ℃, the common diffused gas regulating valve is automatically regulated, and the opening degree of the regulating valve is reduced until the common diffused gas regulating valve is completely closed.
Preferably, the return circulating gas communication pipe is a high-temperature-resistant flue gas pipeline, and is wrapped with aerogel felt or ceramic fiber felt for heat preservation, so that high-temperature damage is avoided.
The aim of the common diffusion of the dry quenching furnace is to discharge combustible gases such as hydrogen, carbon monoxide, methane and the like enriched in a prestoring section, avoid explosion of a dry quenching circulating system and realize the safe red coke loading of the dry quenching furnace.
The invention introduces the part of flue gas into a flue gas outlet air duct of the dry quenching furnace through a flue gas pipeline, and naturally sucks hot flue gas in a pre-storage section zero pressure state to an outlet (namely a boiler inlet) of the dry quenching furnace by means of negative pressure suction in front of a dry quenching circulating fan, and the hot flue gas is rapidly combusted and converted into heat after being contacted with air introduced from the part, and enters a dry quenching furnace system for recycling, thereby realizing source collection and recycling of commonly used diffused gas of the dry quenching furnace.
The present invention differs from the prior art described above:
the invention relates to a source processing method of commonly used diffused gas of a dry quenching furnace, which is different from other tail end collecting processing methods.
The method for treating the commonly-used diffused gas of the dry quenching furnace provided by the invention fully combines the flue gas characteristics of the commonly-used diffused gas of the dry quenching furnace, directly sucks combustible diffused gas into the dry quenching furnace through a pipeline under negative pressure, contacts the introduced air, burns the gas in a high-temperature environment, and enables heat released by burning to enter a boiler along with circulating gas for recycling, thereby realizing source treatment of the diffused gas. The beneficial effects include:
the explosion risk possibly existing in a tail-end flue gas purification system is eliminated, and the potential safety hazard is essentially eliminated;
the environmental pollution caused by the tail end discharge of untreated combustible gases such as methane, carbon monoxide and the like is avoided;
thirdly, the amount of flue gas of the dry quenching furnace to be desulfurized and purified is reduced from the source;
fourthly, directly recovering combustible components in the diffused gas, and recovering heat generated by combustion to increase the yield of dry quenching steam.
Drawings
FIG. 1 is a diagram of a conventional system for processing the source of the vented gas used in the coke dry quenching furnace of the present invention.
In the figure:
10. a dry quenching furnace, 101-a pre-storage section of the dry quenching furnace, 102-a cooling section of the dry quenching furnace, and 103-a discharge section of the dry quenching furnace; 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; 60. a central monitoring unit;
1. a common diffusion port and a corresponding common diffusion pipe at the prestoring section of the dry quenching furnace; 2. emergency water seal of pre-storage section of dry quenching furnace; 3. a return circulating gas connecting pipe; 4. return-to-furnace distribution pipes for commonly-used diffused gas; 5. a field control unit; f1, pre-storing emergency relief valves of the dry quenching furnace; f2, common air diffusing regulating valve; p1, detecting the temperature and pressure of the outlet of the dry quenching furnace; p2, and detecting the pressure of the pre-storage section of the dry quenching furnace.
Detailed Description
Referring to fig. 1, the method for treating the commonly used diffused gas of the dry quenching furnace of the invention comprises the following steps:
1) commonly used diffused gas introduction for pre-storage section of dry quenching furnace
A pre-storage section emergency relief valve is arranged in a common relief pipe corresponding to a common relief port 1 at a pre-storage section of the dry quenching furnace, and an emergency relief water seal 2 is arranged at an outlet section of the common relief pipe; a return circulating gas connecting pipe 3 and a corresponding common diffused gas regulating valve F2 are arranged between the common diffusing pipe and the flue gas outlet air duct of the dry quenching furnace, one end of the return circulating gas connecting pipe 3 is connected with the common diffusing pipe 3, the other end of the return circulating gas connecting pipe extends into the flue gas outlet air duct 30 of the dry quenching furnace, the common diffused gas return distributing pipe 4 is arranged at the end, the common diffused gas return distributing pipe 4 is of at least more than two multi-pipe structures and is horizontally arranged, and the outlet of the common diffused gas return distributing pipe points to the flow direction of the circulating gas at the part;
a pre-storage section pressure detector P2 is arranged in the pre-storage section 101 of the dry quenching furnace; a dry quenching furnace outlet temperature pressure detector P1 is arranged in the dry quenching furnace flue gas outlet air duct 30; the pre-storage section emergency relief valve F1, the common relief gas regulating valve F2, the pre-storage section pressure detector P2 and the dry quenching furnace outlet temperature pressure detector P1 are all connected to a field control unit 5, and the field control unit 5 is connected to a central monitoring unit 60 for coking production;
under the normal operation state, the pressure at the outlet air duct of the dry quenching furnace is negative pressure which exceeds-1000 Pa, the pressure of the prestoring section is zero pressure +/-50 Pa, the thermal buoyancy of a return circulating gas connecting pipe is overcome by means of the pressure difference between a prestoring section release port and the flue gas outlet air duct of the dry quenching furnace, and the prestoring section release gas is introduced into the flue gas outlet air duct of the dry quenching furnace; the part is introduced with air and is under the high temperature condition, common diffused gas is fully combusted once entering, and the common diffused gas is converted into heat to be supplied to a dry quenching boiler for recycling;
2) common purge gas introduction regulation
Before red coke is loaded, closing a common diffused gas regulating valve and locking, and regulating the pressure of a prestoring section to be more than-30 Pa so as to resist pressure fluctuation caused by hot air replaced by red coke in the red coke loading process and avoid the escape of flue gas loaded into a furnace mouth; after the red coke is loaded and the furnace cover is closed, the pressure of the prestoring section is restored to zero pressure +/-50 Pa, and the common diffused gas regulating valve is unlocked to restore the normal regulating state.
Preferably, when the pre-storage section emergency relief water seal and the pre-storage section emergency relief valve have a dry quenching circulating gas circulating system decompression fault and the content of combustible gas in the circulating system is abnormally increased, the pre-storage section emergency relief valve is opened, and the pre-storage section emergency relief pipe performs emergency relief to ensure the safety state of the dry quenching circulating system.
Preferably, when the dry quenching furnace is in a non-loading state, the pressure of a pre-storage section of the dry quenching furnace exceeds 500Pa, the dry quenching furnace is remotely opened by a central monitoring unit, and the height of a water seal of an emergency relief water seal is set to be 50mmH2Water column O should be used for abnormal emission.
Preferably, according to the detection of the temperature and the pressure of the outlet of the dry quenching furnace, when the temperature exceeds the set value of the temperature of the inlet of the boiler by +/-10 ℃, the common diffused gas regulating valve is automatically regulated, and the opening degree of the regulating valve is reduced until the common diffused gas regulating valve is completely closed.
Preferably, the return circulating gas communication pipe is a high-temperature-resistant smoke pipeline, and is wrapped with aerogel felt or ceramic fiber felt for heat preservation.
The invention is a localized dry quenching furnace gas emission source treatment technology, can ensure the safe, stable and low-consumption operation of the system, and realizes the ultra-clean emission of the dry quenching furnace gas emission in the true sense.
The problem that sulfur dioxide in flue gas exceeds standard is a public secret and can be discharged after being subjected to desulfurization and purification treatment. At present, the scheme of combining two parts of flue gas after diffusing a fan with high sulfur concentration and pre-storing and diffusing the two parts of flue gas is generally adopted for desulfurization and purification treatment. The invention carries out the pre-storage section diffused gas back-to-furnace treatment and carries out the desulfurization treatment only on the diffused gas behind the fan, thus being economical and environment-friendly and having very wide popularization and application prospect.
Claims (5)
1. A method for treating commonly used diffused gas of a coke dry quenching furnace is characterized by comprising the following steps:
1) introduction of commonly used diffused gas in prestoring section of dry quenching furnace
A pre-storage section emergency relief valve is arranged in a common relief pipe corresponding to a common relief port of a pre-storage section of the dry quenching furnace, and an emergency relief water seal is arranged in an outlet section of the common relief pipe; a return circulating gas communicating pipe and a corresponding common diffused gas regulating valve are arranged between the common diffused pipe and a flue gas outlet air duct of the dry quenching furnace, one end of the return circulating gas communicating pipe is connected with the common diffused pipe, the other end of the return circulating gas communicating pipe extends into the flue gas outlet air duct of the dry quenching furnace, and a common diffused gas return distributing pipe is arranged, the common diffused gas return distributing pipe is of at least more than two multi-pipe structures and is arranged horizontally, and the outlet of the common diffused gas return distributing pipe points to the flow direction of the circulating gas at the part;
a pre-storage section pressure detector is arranged in the pre-storage section of the dry quenching furnace; a dry quenching furnace outlet temperature pressure detector is arranged in the flue gas outlet air duct of the dry quenching furnace; the pre-storage section emergency relief valve, the common relief gas regulating valve, the pre-storage section pressure detector and the dry quenching furnace outlet temperature pressure detector are all connected to a field control unit, and the field control unit is connected to a dry quenching furnace central monitoring unit;
under the normal operation state, the pressure at the outlet air duct of the dry quenching furnace is negative pressure which exceeds-1000 Pa, the pressure of the prestoring section is zero pressure +/-50 Pa, the thermal buoyancy of a return circulating gas connecting pipe is overcome by means of the pressure difference between a prestoring section common diffusion port and the flue gas outlet air duct of the dry quenching furnace, and the prestoring section diffused gas is introduced into the flue gas outlet air duct of the dry quenching furnace; the part is introduced with air and is under the high temperature condition, common diffused gas is fully combusted once entering, and the common diffused gas is converted into heat to be supplied to a dry quenching boiler for recycling;
2) common purge gas introduction regulation
Before red coke is loaded, closing a common diffused gas regulating valve and locking, and regulating the pressure of a prestoring section to be more than-30 Pa so as to resist the pressure fluctuation caused by hot air replacement of red coke in the red coke loading process and avoid the escape of flue gas loaded into a furnace mouth; after the red coke is loaded and the furnace cover is closed, the pressure of the prestoring section is restored to zero pressure +/-50 Pa, and the common diffused gas regulating valve is unlocked to restore the normal regulating state.
2. The method for processing the commonly used diffused gas of the dry quenching furnace as claimed in claim 1, wherein the pre-storage section emergency diffusion water seal and the pre-storage section emergency diffusion valve open the pre-storage section emergency diffusion valve when the dry quenching circulating gas circulating system fails to depressurize and the combustible gas content of the circulating system abnormally rises, and the pre-storage section emergency diffusion valve performs emergency diffusion through the pre-storage section emergency diffusion pipe to ensure the safe state of the dry quenching circulating system.
3. The method for processing commonly used diffused gas of the dry quenching furnace as claimed in claim 1, wherein, in the non-loading state of the dry quenching furnace, the pressure of the pre-storage section of the dry quenching furnace exceeds 500Pa, the dry quenching furnace is remotely opened by a central monitoring unit, and the height of an emergency diffused water seal is set to be 50mmH2Water column O should be used for abnormal emission.
4. The method as claimed in claim 1, wherein the common purge gas regulating valve is automatically adjusted to close the valve opening until all valves are closed when the temperature exceeds the boiler inlet temperature setting value by 20 ± 10 ℃ according to the dry quenching furnace outlet temperature and pressure detection.
5. The method for treating the commonly used diffused gas of the dry quenching furnace as claimed in claim 1, wherein the return circulating gas communicating pipe is a flue gas pipeline made of high temperature resistant material, and is externally coated with aerogel felt or ceramic fiber felt for heat preservation.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3216898C1 (en) * | 1982-05-06 | 1983-10-06 | Didier Eng | Process for utilising the sensible coke heat in dry coke cooling |
| CN102424754A (en) * | 2011-10-20 | 2012-04-25 | 山东道诚工程技术有限公司 | Coke dry quenching device |
| CN105802639A (en) * | 2016-05-10 | 2016-07-27 | 中冶焦耐工程技术有限公司 | Coke dry quenching furnace diffused gas treatment method |
| CN109207173A (en) * | 2017-06-30 | 2019-01-15 | 宝山钢铁股份有限公司 | The method smoldered is controlled when a kind of dry coke quenching is packed into |
| CN110607180A (en) * | 2019-09-30 | 2019-12-24 | 济钢集团国际工程技术有限公司 | Desulfurization process system for commonly-used diffused flue gas for dry quenching |
-
2019
- 2019-12-30 CN CN201911400993.0A patent/CN113122290B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3216898C1 (en) * | 1982-05-06 | 1983-10-06 | Didier Eng | Process for utilising the sensible coke heat in dry coke cooling |
| CN102424754A (en) * | 2011-10-20 | 2012-04-25 | 山东道诚工程技术有限公司 | Coke dry quenching device |
| CN105802639A (en) * | 2016-05-10 | 2016-07-27 | 中冶焦耐工程技术有限公司 | Coke dry quenching furnace diffused gas treatment method |
| CN109207173A (en) * | 2017-06-30 | 2019-01-15 | 宝山钢铁股份有限公司 | The method smoldered is controlled when a kind of dry coke quenching is packed into |
| CN110607180A (en) * | 2019-09-30 | 2019-12-24 | 济钢集团国际工程技术有限公司 | Desulfurization process system for commonly-used diffused flue gas for dry quenching |
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