CN111457674A - Coke drying process and drying device - Google Patents
Coke drying process and drying device Download PDFInfo
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- CN111457674A CN111457674A CN202010427001.XA CN202010427001A CN111457674A CN 111457674 A CN111457674 A CN 111457674A CN 202010427001 A CN202010427001 A CN 202010427001A CN 111457674 A CN111457674 A CN 111457674A
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- 238000001035 drying Methods 0.000 title claims abstract description 192
- 239000000571 coke Substances 0.000 title claims abstract description 160
- 239000007789 gas Substances 0.000 claims abstract description 143
- 239000000428 dust Substances 0.000 claims abstract description 73
- 230000007246 mechanism Effects 0.000 claims abstract description 54
- 239000002912 waste gas Substances 0.000 claims abstract description 42
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 98
- 238000002156 mixing Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 13
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 9
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to the technical field of energy conservation and environmental protection in the steel smelting industry, in particular to a coke drying process and a coke drying device. The coke drying process is used for drying coke in a coke bin by introducing drying gas, and comprises the following steps: 1) adjusting the temperature of the drying gas before entering the coke bin to be within a preset temperature range; 2) introducing the drying gas reaching the preset temperature range into the coke bin through the air-entraining main pipe to dry coke; 3) and adjusting the temperature of the drying waste gas discharged from the coke bin to be within a preset temperature range, and then discharging the drying waste gas after entering the dust removal mechanism for dust removal. The invention has the beneficial effects that: the drying process has simple steps, the temperature of the drying gas is adjusted so as to be suitable for different gas sources, and the temperature of the discharged drying waste gas is adjusted and the dust is removed, so that the problem that the system cannot normally operate due to the separation of moisture when the drying waste gas is discharged is avoided, the service life of the equipment is prolonged, the safety performance and the dust removal and discharge effect of the drying waste gas are improved, and the environmental protection performance is good.
Description
Technical Field
The invention relates to the technical field of energy conservation and environmental protection in the steel smelting industry, in particular to a coke drying process and a coke drying device.
Background
Coke is one of the essential raw fuels for modern blast furnace smelting, and can reduce iron in an oxidized state into pig iron. The modern blast furnace uses coke as fuel, which is mainly used as a heating agent, a reducing agent, a material column framework and the like in blast furnace smelting. In blast furnace production, some enterprises are in the area that annual precipitation or snowfall are great, and when outsourcing coke proportion is great, perhaps under the relatively poor condition of stock ground storage condition, the coke receives the influence of rainfall or snowfall, and the fluctuation of the coke water content of entering the stove is great, reaches more than 10% on average, and the water content of rainy season reaches nearly 20% even, and the water content is higher, causes great influence to blast furnace production.
The coke drying technology is an effective way for stabilizing blast furnace production, recycling waste heat of discharged gas and saving energy and improving efficiency in blast furnace smelting. The existing steel enterprises basically lead out drying gas on a flue gas pipeline at the inlet of a chimney behind a flue gas heat exchanger of a hot blast stove, lead the flue gas to the position below a coke tank of the blast furnace ore through an induced draft fan, lead a plurality of preheating branch pipes to a flue gas header pipe behind the induced draft fan, lead the preheating branch pipes to each coke bin respectively, and heat and dry the coke in the bin. And an exhaust pipe is arranged at the upper part of each coke bin to exhaust the flue gas after preheating coke out of the coke bin and discharge the flue gas to the air.
At present, domestic enterprises adopt a coke drying technology, but more or less problems exist, because some problems cannot be effectively solved, and the enterprises are even in a non-use or disuse state. The prior coke drying process mainly has the following problems: (1) the exhaust emission system does not remove dust and can not meet the national environmental protection requirement or the system is stopped because of poor dust removal effect of water analysis; (2) when the content of harmful gases in the drying gas exceeds the standard, if the content of CO exceeds the standard, safety accidents easily occur when workers inspect the area above the tank; (3) the temperature of the drying airflow cannot be adjusted, so that the drying effect is unstable; (4) the drying air source is selected singly, and the system application limit is more.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a coke drying process and a drying apparatus, which are used to solve the problems of the prior art, such as poor safety of coke drying and poor dust removal effect of the drying gas exhaust system.
In order to achieve the above and other related objects, the present invention provides a coke drying process for drying coke in a coke bin by introducing a drying gas, comprising the steps of:
1) adjusting the temperature of the drying gas before entering the coke bin to be within a preset temperature range;
2) introducing the drying gas reaching the preset temperature range into the coke bin through the air-entraining main pipe to dry coke;
3) and adjusting the temperature of the drying waste gas discharged from the coke bin to be within a preset temperature range, and then discharging the drying waste gas after entering the dust removal mechanism for dust removal.
The invention has the beneficial effects that: the drying process has simple steps, the temperature of the drying gas is adjusted so as to be suitable for different gas sources, and the temperature of the discharged drying waste gas is adjusted and the dust is removed, so that the problem that the system cannot normally operate due to the separation of moisture when the drying waste gas is discharged is avoided, the service life of the equipment is prolonged, the safety performance and the dust removal and discharge effect of the drying waste gas are improved, and the environmental protection performance is good.
Optionally, in step 1), the drying air with temperature difference is introduced through each bleed air branch pipe provided with a bleed air flow regulating valve, and the opening of the bleed air flow regulating valve on each bleed air branch pipe is regulated to enable the temperature of the mixed drying air with temperature difference to reach the preset temperature range and then input into the bleed air main pipe.
Optionally, the following steps are further included between step 1) and step 2): air is introduced to be mixed with the drying gas through an atmosphere bypass pipe provided with an atmosphere flow regulating valve, and the opening degree of the atmosphere flow regulating valve is regulated according to data fed back by a first temperature sensor, a first pressure sensor and a harmful gas detector which are arranged on the air-entraining main pipe, so that the temperature of the drying gas entering the coke bin after mixing is within a preset temperature range of 140-250 ℃, and the harmful gas in the drying gas is within a safe concentration range.
Optionally, in step 3), the drying gas is introduced through a drying gas bypass pipe provided with a drying gas bypass flow regulating valve to be mixed with the drying waste gas discharged from the coke bin until the temperature of the drying waste gas entering the dust removing mechanism is within a preset temperature range of 80-150 ℃, and the opening degree of the drying gas bypass flow regulating valve is adjusted according to data fed back by a second temperature sensor in the dust removing mechanism.
Optionally, in step 2), an air inlet end and an air outlet end of the coke bin are respectively provided with an air inlet flow regulating valve and an air outlet flow regulating valve, and the opening degrees of the air inlet flow regulating valve and the air outlet flow regulating valve are adjusted according to data fed back by a second temperature sensor and a second pressure sensor in the dust removal mechanism.
The beneficial effect of adopting the above optional scheme is: realize the nimble regulation of stoving gas temperature, the air supply is selected in a flexible way various for the stoving effect is stable, can also avoid the harmful gas in the stoving gas to exceed standard, avoids patrolling and examining regional incident of appearing, improves the security performance, and dust removal effect is good.
The drying device suitable for the coke drying process comprises a main air-entraining pipe, a coke bin and a dust removal mechanism, wherein the air outlet end of the main air-entraining pipe is communicated with the air inlet end of the coke bin through a coke bin air inlet branch pipe, the air outlet end of the coke bin is communicated with the air inlet end of the dust removal mechanism through a coke bin air outlet branch pipe, and the drying device further comprises at least one of the following components:
the two ends of the drying gas bypass pipe are respectively communicated with the gas outlet end of the gas-guiding main pipe and the coke bin exhaust branch pipe, a drying gas bypass flow regulating valve is arranged on the drying gas bypass pipe, and the opening degree of the drying gas bypass flow regulating valve is adjusted according to data fed back by a second temperature sensor in the dust removal mechanism;
the atmosphere bypass pipe is communicated with the air-bleed main pipe and is provided with an atmosphere flow regulating valve;
and the air-entraining branch pipe assembly is communicated with the air inlet end of the air-entraining main pipe and is used for adjusting the temperature of the drying air input into the air-entraining main pipe.
Optionally, a safety valve, a first temperature sensor, a first pressure sensor, an induced draft fan and a harmful gas detector are arranged on the air-entraining main pipe, the safety valve, the atmosphere bypass pipe and the induced draft fan are sequentially arranged along the flow direction of the drying air, and the opening degree of the atmosphere flow regulating valve is adjusted according to data fed back by the first temperature sensor, the first pressure sensor and the harmful gas detector.
Optionally, the bleed air branch pipe assembly includes two bleed air branch pipes arranged in parallel, a bleed air flow regulating valve is arranged on each bleed air branch pipe, an air inlet end of each bleed air branch pipe is communicated with a drying air source having a temperature difference, and an air outlet end of each bleed air branch pipe is communicated with an air inlet end of the bleed air main pipe.
Optionally, the dust removal mechanism is including installing second pressure sensor, second temperature sensor, dust bag and dust exhausting fan on coke bin exhaust branch, be equipped with air inlet flow governing valve and exhaust flow governing valve on coke bin air inlet branch and the coke bin exhaust branch respectively, the data adjustment of air inlet flow governing valve and exhaust flow governing valve's aperture according to second temperature sensor and second pressure sensor feedback.
Optionally, the number of the coke bins is at least one, when the number of the coke bins is greater than or equal to two, each coke bin is correspondingly provided with a dust removal mechanism and a drying gas bypass pipe, each coke bin exhaust branch pipe is communicated through a pressure equalizing flow equalizing pipe, and connecting points of the pressure equalizing flow pipe, the drying gas bypass pipe and the coke bin exhaust branch pipe are sequentially distributed along the flow direction of drying waste gas.
The invention has the beneficial effects that: the temperature and the amount of the drying gas are adjusted through the air-entraining branch pipe assembly, the drying efficiency of the coke and the stability of the drying effect are improved, and the air-entraining branch pipe assembly can adapt to air sources with various temperatures and improve the universality; by arranging the atmosphere bypass pipe, the concentration of harmful gas can be reduced, the drying gas can be ensured to be in a safe temperature range, and the safety performance is improved; the parts such as the dust removal mechanism, the drying gas bypass pipe and the like are mutually matched to prevent moisture of the drying waste gas from being condensed and separated out in the dust removal mechanism to cause the breakdown of the dust removal mechanism, so that the safe and stable operation of the dust removal mechanism is ensured, and the environmental protection performance is improved.
Drawings
Fig. 1 is a schematic structural diagram of a drying apparatus according to the present invention.
Description of reference numerals
11. A high temperature gas source; 12. a low temperature gas source; 13. a bleed manifold; 14. a bleed manifold; 15. a bleed air flow regulating valve; 16. a bleed air flow regulating valve;
2. a bleed manifold; 21. a safety valve; 22. a first temperature sensor; 23. a first pressure sensor; 24. an induced draft fan; 25. a harmful gas detector; 26. a third pressure sensor;
3. an atmosphere bypass pipe; 31. an atmospheric flow regulating valve;
41. 1# coke bin; 42. 1# coke bin inlet branch; 43. 1# intake flow rate regulating valve; 44. 1# coke bin exhaust branch; 45. 1# exhaust flow control valve; 46. 1# drying gas bypass pipe; 47. the No. 1 drying air bypass flow regulating valve;
51. a No. 2 coke bin; 52. a No. 2 coke bin inlet branch pipe; 53. 2# intake flow regulating valve; 54. 2# coke bin exhaust branch; 55. 2# exhaust flow control valve; 56. 2# drying gas bypass pipe; 57. 2# drying gas bypass flow regulating valve;
6. a voltage-sharing and current-sharing communicating pipe;
71. 1# second pressure sensor; 72. 1# second temperature sensor; 73. no. 1 dust removal bag; 74. 1# dedusting induced draft fan; 75. 1# chimney;
81. 2# second pressure sensor; 82. 2# second temperature sensor; 83. 2# dust bag; 84. 2# dedusting induced draft fan; 85. and 2# chimney.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "front", "rear" and "a" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial technical changes and modifications.
Before describing embodiments of the present invention in detail, the present invention will be described in an application environment. The technology of the invention is mainly applied to coke drying, in particular to the realization of coke drying through drying gas. The invention solves the technical problems that the traditional coke drying technology is single in adaptive air source, inconvenient in drying air temperature adjustment, easy to cause potential safety hazard due to over standard of harmful gas in the drying air, easy to condense and separate out water in a dust removing mechanism of drying waste gas and the like.
The coke drying process of the invention dries coke in the coke bin by introducing the drying gas, and comprises the following steps: 1) adjusting the temperature of the drying gas before entering the coke bin to be within a preset temperature range; 2) introducing the drying gas reaching the preset temperature range into the coke bin through the air-entraining main pipe to dry coke; 3) and adjusting the temperature of the drying waste gas discharged from the coke bin to be within a preset temperature range, and then discharging the drying waste gas after entering the dust removal mechanism for dust removal.
According to the coke drying process, the temperature of the drying gas is adjusted before the drying gas enters the coke bin, so that the drying gas entering the coke bin can be ensured to be within a preset temperature range, and gas sources with different temperatures can be suitable for use, and the coke drying process is convenient to adapt to various gas sources; the dust removal effect can be improved by removing dust through the dust removal mechanism before the drying waste gas is discharged, and the environmental protection requirement is met; the drying waste gas before entering dust removal mechanism behind the discharge coke storehouse carries out temperature regulation, effectively avoids the moisture of drying waste gas to condense in dust removal mechanism and separates out and lead to dust removal mechanism trouble for dust removal mechanism can safe and stable's operation.
As shown in fig. 1, in an exemplary embodiment, in step 1), the temperature of the drying gas may be adjusted by mixing gas sources with different temperatures, for example, the selectable low-temperature gas source may include hot blast furnace flue gas, sintering ring cold waste gas, lime kiln waste gas, etc., and the selectable high-temperature gas source may include combustion furnace waste gas, etc., and mixing the gas sources with different temperatures may both meet the temperature requirement of the drying gas and increase the range of applicable gas sources. When an air source is introduced, the drying air with temperature difference can be introduced through each air-entraining branch pipe provided with the air-entraining flow regulating valve, and the opening of the air-entraining flow regulating valve on each air-entraining branch pipe is regulated to ensure that the temperature of the mixed drying air with temperature difference reaches the preset temperature range and then is input into the air-entraining main pipe. For example, two bleed air branch pipes are provided, a bleed air flow regulating valve 13 is provided on the bleed air branch pipe 15, the bleed air branch pipe 15 is communicated with the high temperature air source 11, a bleed air flow regulating valve 16 is provided on the bleed air branch pipe 14, the bleed air branch pipe 14 is communicated with the low temperature air source 12, flow regulation of air sources with different temperatures is realized by regulating the bleed air flow regulating valve 13 and the bleed air flow regulating valve 16, so that temperature regulation of mixed drying air is realized, regulation is flexible and convenient, the temperature of the mixed drying air is fed back through a first temperature sensor 22 on the bleed air main pipe 2, and thus the bleed air flow regulating valve 13 and the bleed air flow regulating valve 16 are adaptively regulated.
As shown in fig. 1, in an exemplary embodiment, in step 2), the inlet end and the outlet end of the coke bin are respectively provided with an inlet flow regulating valve and an outlet flow regulating valve, and the opening degrees of the inlet flow regulating valve and the outlet flow regulating valve are adjusted according to data fed back by the second temperature sensor and the second pressure sensor in the dust removal mechanism, so as to control the amount of the drying gas entering the coke bin and the amount of the drying exhaust gas exiting the coke bin.
As shown in fig. 1, in an exemplary embodiment, the following steps are further included between step 1) and step 2): the air is introduced through the atmosphere bypass pipe 3 provided with the atmosphere flow regulating valve 31 and is mixed with the drying air in the air-entraining main pipe 2, the opening degree of the atmosphere flow regulating valve 31 is regulated according to data fed back by the first temperature sensor 22, the first pressure sensor 23 and the harmful gas detector 25 which are arranged on the air-entraining main pipe 2, the atmosphere flow regulating valve 31 can regulate the opening degree according to the data fed back by the first temperature sensor 22 and the first pressure sensor 23 to control the air quantity entering the air-entraining main pipe 2, so that the temperature of the drying air entering the coke bin after mixing is within a preset temperature range of 140 ℃ -250 ℃ (including 140 ℃, 250 ℃), and is always within a safe temperature range, and the safety performance is improved; the atmospheric flow control valve 31 can also adjust the opening according to the data fed back by the harmful gas detector 25 to control the air of the air-entraining main pipe 2, so as to dilute the concentration of the harmful gas, so that the harmful gas in the drying gas is in the safe concentration range, in the embodiment, the harmful gas can be CO, and the harmful gas detector 25 can be a CO detector, thereby ensuring the safety of the working personnel and improving the safety performance.
As shown in fig. 1, in an exemplary embodiment, in step 3), the drying gas is introduced through the drying gas bypass pipe provided with the drying gas bypass flow regulating valve to mix with the drying exhaust gas discharged from the coke bin until the temperature of the drying exhaust gas entering the dust removing mechanism is within a preset temperature range of 80 ℃ to 150 ℃, for example, any one of 80 ℃, 90 ℃, 110 ℃ or 150 ℃. The opening degree of the drying gas bypass flow regulating valve is adjusted according to data fed back by a second temperature sensor in the dust removal mechanism, the temperature of the drying waste gas is mixed with the drying gas before the drying waste gas enters the dust removal mechanism, the temperature of the drying waste gas entering the dust removal mechanism is not lower than 80 ℃, moisture condensation separation is avoided, moisture condensation separation in the dust removal mechanism is avoided, the dust removal mechanism fault is caused, the environment-friendly requirement is met, the safe and stable operation of the dust removal mechanism is guaranteed, the faults are reduced, and the cost is reduced.
As shown in fig. 1, the drying device of the present invention is suitable for the coke drying process according to any of the above exemplary embodiments, and includes a main air-guiding pipe 2, a coke bin and a dust removing mechanism, wherein an air outlet end of the main air-guiding pipe 2 is communicated with an air inlet end of the coke bin through a coke bin air inlet branch pipe, an air outlet end of the coke bin is communicated with an air inlet end of the dust removing mechanism through a coke bin air outlet branch pipe, and the drying device further includes at least one of the following: the system comprises a drying gas bypass pipe, an atmosphere bypass pipe 3 and a bleed air branch pipe assembly, namely at least comprises any one mechanism of the drying gas bypass pipe, the atmosphere bypass pipe 3 and the bleed air branch pipe assembly, or the combination of any two mechanisms, or the combination of three mechanisms. The two ends of the dried gas bypass pipe are respectively communicated with the gas outlet end of the gas guide header pipe 2 and the coke bin exhaust branch pipe, a dried gas bypass flow regulating valve is arranged on the dried gas bypass pipe, the opening degree of the dried gas bypass flow regulating valve is regulated according to data fed back by a second temperature sensor in the dust removal mechanism, the flow of dried gas mixed with the dried waste gas is controlled by controlling the opening degree of the dried gas bypass flow regulating valve, the temperature of the dried waste gas discharged from the coke bin is regulated before entering the dust removal mechanism, and moisture of the dried waste gas entering the dust removal mechanism is prevented from being condensed and separated out; the atmosphere bypass pipe 3 is communicated with the air-bleed main pipe 2, an atmosphere flow regulating valve 31 is arranged on the atmosphere bypass pipe 3, and by controlling the opening of the atmosphere flow regulating valve 31, the harmful gas in the drying gas in the air-bleed main pipe 2 can be diluted, and the temperature of the drying gas in the air-bleed main pipe 2 can be regulated; bleed branch pipe subassembly and bleed house steward 2's inlet end intercommunication to adjust the temperature of the stoving gas of input bleed house steward 2, so that adapt to the air supply of different temperatures, the commonality is strong, and the temperature regulation of stoving gas is convenient, has improved the drying efficiency of coke and the stability of stoving effect.
As shown in fig. 1, in an exemplary implementation, the coke bin inlet branch pipe may be divided into a plurality of small inlet pipes to enter the coke bin, so that the drying gas can uniformly enter, which is beneficial to fully and uniformly contacting with the coke in the coke bin, and improves the drying effect.
As shown in fig. 1, in an exemplary embodiment, a safety valve 21, a first temperature sensor 22, a first pressure sensor 23, an induced draft fan 24, a harmful gas detector 25, and a third pressure sensor 26 are disposed on the bleed air manifold 2, the safety valve 21, the atmosphere bypass pipe 3, the induced draft fan 24, and the third pressure sensor 26 are sequentially disposed along the flow direction of the drying air, the first pressure sensor 23 and the third pressure sensor 26 cooperate to detect whether the induced draft fan 24 normally operates, the safety valve 21 may be a flow regulating valve, and when the bleed air flow regulating valve fails, the drying air flow may be controlled by the safety valve. The aperture of the atmospheric flow control valve 31 is adjusted according to the data fed back by the first temperature sensor 22, the first pressure sensor 23 and the harmful gas detector 25, so that the temperature of the drying gas in the air-entraining main pipe 2 and the concentration of the harmful gas are both within a safe range, the drying gas can effectively dry coke, and the safety performance is also ensured.
In an exemplary embodiment, as shown in fig. 1, the bleed manifold assembly comprises at least 1 bleed manifold, on which bleed flow regulating valves are provided, and when there is only one bleed manifold, the temperature can be adjusted by regulating the flow of the high-temperature drying gas in the bleed manifold and the flow of the atmosphere in the atmosphere bypass. When the air-bleed branch pipe assembly comprises two air-bleed branch pipes arranged in parallel, each air-bleed branch pipe is provided with an air-bleed flow regulating valve, the air inlet end of each air-bleed branch pipe is respectively communicated with a drying air source with temperature difference, and the air outlet end of each air-bleed branch pipe is communicated with the air inlet end of the air-bleed main pipe 2; for example, a bleed air flow regulating valve 13 is arranged on the bleed air branch pipe 15, the bleed air branch pipe 15 is communicated with the high-temperature air source 11, a bleed air flow regulating valve 16 is arranged on the bleed air branch pipe 14, the bleed air branch pipe 14 is communicated with the low-temperature air source 12, and flow regulation of air sources with different temperatures is realized by regulating the bleed air flow regulating valve 13 and the bleed air flow regulating valve 16, so that temperature regulation of mixed drying air is realized, the regulation is flexible and convenient, the temperature of the mixed drying air is fed back through a first temperature sensor 22 on the bleed air main pipe 2, and the bleed air flow regulating valve 13 and the bleed air flow regulating valve 16 are adaptively regulated.
As shown in fig. 1, in an exemplary embodiment, the dust removing mechanism includes a second pressure sensor, a second temperature sensor, a dust removing bag and a dust removing fan which are installed on the coke bin exhaust branch pipe, an inlet flow regulating valve and an exhaust flow regulating valve are respectively arranged on the coke bin inlet branch pipe and the coke bin exhaust branch pipe, and the opening degrees of the inlet flow regulating valve and the exhaust flow regulating valve are adjusted according to data fed back by the second temperature sensor and the second pressure sensor. When the number of the coke bins is more than or equal to two, the exhaust branch pipes of each coke bin are communicated through the pressure equalizing flow equalizing pipes 6, so that the flow and the pressure of the dried waste gas discharged by each coke bin can be evenly distributed, the pressure in the space at the upper part of each coke bin is always negative, the dried waste gas at the upper part of the coke chute cannot overflow from the discharge opening at the upper part of the coke chute, and safety accidents caused by the fact that workers at the upper part of the coke chute suck the waste gas are avoided; the pressure-equalizing flow-equalizing pipe 6, the connecting points of the drying gas bypass pipe and the coke bin exhaust branch pipe are sequentially distributed along the flowing direction of the drying waste gas, so that the drying gas in the drying gas bypass pipe is prevented from entering other dust removing mechanisms to interfere with each other through the pressure-equalizing flow-equalizing pipe 6, the quantity of the drying gas entering the dust removing mechanism corresponding to the drying gas bypass pipe is influenced, and the temperature of the drying waste gas cannot be accurately and stably regulated.
For example, when two coke bins are provided, the coke bin # 1 41 and the coke bin # 2 51 are arranged in parallel, the inlet end of the coke bin # 1 41 is communicated with the outlet end of the air-bleed main pipe 2 through the coke bin inlet branch pipe 1 42, the coke bin inlet branch pipe 1 42 is provided with an inlet air flow regulating valve # 1 43, the outlet end of the coke bin # 1 is communicated with the dust-removing mechanism # 1 through the coke bin outlet branch pipe 1 44, the coke bin outlet branch pipe 1 44 is provided with an outlet air flow regulating valve # 1 45, the pressure equalizing and equalizing pipe 6, the outlet end of the dried air bypass pipe 1 46, the outlet air flow regulating valve # 1 45, the second pressure sensor # 1 71, the second temperature sensor # 1, the dust-removing bag # 73, the dust-removing fan # 1 74 and the chimney # 1 are arranged on the coke bin outlet branch pipe 1 44 and are sequentially distributed along the flow direction of the dried exhaust gas in the coke bin outlet branch pipe 1 44, the positions of the 1# second pressure sensor 71 and the 1# second temperature sensor 72 can be interchanged; the opening degree of the 1# dry gas bypass flow control valve 47 of the 1# dry gas bypass pipe 46 is adjusted according to the data fed back by the 1# second temperature sensor 72, and the opening degrees of the 1# intake flow control valve 43 and the 1# exhaust flow control valve 45 are adjusted according to the data fed back by the 1# second pressure sensor 71 and the 1# second temperature sensor 72, thereby controlling the amount of dry gas entering into and discharged from the 1# coke bin 41. The air inlet end of the No. 2 coke bin 51 is communicated with the air outlet end of the air-entraining header pipe 2 through the No. 2 coke bin air inlet branch pipe 52, and the 2# coke bin inlet branch pipe 52 is provided with a 2# inlet flow regulating valve 53, the exhaust end of the 2# coke bin 51 is communicated with the 2# dust removing mechanism through a 2# coke bin exhaust branch pipe 54, and the No. 2 coke bin exhaust branch pipe 54 is provided with a No. 2 exhaust flow regulating valve 55, the pressure equalizing and equalizing pipe 6, the outlet end of the No. 2 dry gas bypass pipe 56, the No. 2 exhaust flow regulating valve 55, a No. 2 second pressure sensor 81, a No. 2 second temperature sensor 82, a No. 2 dust bag 83, a No. 2 dust-removing fan 84 and a No. 2 chimney are arranged on the No. 2 coke bin exhaust branch pipe 84 and are sequentially distributed along the flow direction of the dry waste gas in the No. 2 coke bin exhaust branch pipe 84, the positions of the 2# second pressure sensor 81 and the 2# second temperature sensor 82 can be interchanged; the opening degree of the 2# dry gas bypass flow control valve 57 on the 2# dry gas bypass pipe 56 is adjusted according to the data fed back by the 2# second temperature sensor 82, and the opening degrees of the 2# intake flow control valve 53 and the 2# exhaust flow control valve 55 are adjusted according to the data fed back by the 2# second pressure sensor 81 and the 2# second temperature sensor 82, thereby controlling the amount of dry gas entering into and discharged from the 2# coke bin 51.
In summary, the coke drying process and the coke drying device of the invention at least have the following beneficial effects: 1) the temperature and the air quantity of the drying gas can be self-regulated, and the drying efficiency and the stability of the drying effect of the coke are improved; 2) the range of the selectable drying gas source is wide, low-temperature hot blast furnace flue gas, sintering ring cold waste gas, lime kiln waste gas and the like can be selected, and high-temperature flue gas such as combustion furnace waste gas and the like can also be selected; 3) harmful gases such as CO content and the like in the drying gas can be effectively controlled not to exceed the standard, so that the safety of workers in the ore coke tank is ensured; 4) the online temperature self-adjustment of the exhaust gas can be realized, moisture of the drying exhaust gas is prevented from being condensed and separated out in the dust removing mechanism, so that the dust removing mechanism breaks down, the safe and stable operation of the dust removing mechanism is ensured, and the requirement of the national environmental protection standard for the exhaust gas is met.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A coke drying process is used for drying coke in a coke bin by introducing drying gas, and is characterized by comprising the following steps:
1) adjusting the temperature of the drying gas before entering the coke bin to be within a preset temperature range;
2) introducing the drying gas reaching the preset temperature range into the coke bin through the air-entraining main pipe to dry coke;
3) and adjusting the temperature of the drying waste gas discharged from the coke bin to be within a preset temperature range, and then discharging the drying waste gas after entering the dust removal mechanism for dust removal.
2. The coke drying process according to claim 1, wherein in step 1), the drying air with temperature difference is introduced through each bleed air branch pipe provided with a bleed air flow regulating valve, and the opening degree of the bleed air flow regulating valve on each bleed air branch pipe is adjusted to make the mixed temperature of the drying air with temperature difference reach a preset temperature range and then input into the bleed air main pipe.
3. The coke drying process of claim 1, further comprising the following steps between step 1) and step 2): air is introduced to be mixed with the drying gas through an atmosphere bypass pipe provided with an atmosphere flow regulating valve, and the opening degree of the atmosphere flow regulating valve is regulated according to data fed back by a first temperature sensor, a first pressure sensor and a harmful gas detector which are arranged on the air-entraining main pipe, so that the temperature of the drying gas entering the coke bin after mixing is within a preset temperature range of 140-250 ℃, and the harmful gas in the drying gas is within a safe concentration range.
4. The coke drying process according to claim 1, wherein in step 3), the drying gas is introduced through a drying gas bypass pipe provided with a drying gas bypass flow regulating valve to mix with the drying waste gas discharged from the coke bin until the temperature of the drying waste gas entering the dust removing mechanism is within a preset temperature range of 80 ℃ to 150 ℃, and the opening degree of the drying gas bypass flow regulating valve is adjusted according to data fed back by a second temperature sensor in the dust removing mechanism.
5. The coke drying process according to claim 1, wherein in step 2), the inlet end and the outlet end of the coke bin are respectively provided with an inlet flow regulating valve and an outlet flow regulating valve, and the opening degrees of the inlet flow regulating valve and the outlet flow regulating valve are adjusted according to the data fed back by the second temperature sensor and the second pressure sensor in the dust removing mechanism.
6. A drying apparatus suitable for use in the coke drying process according to any one of claims 1 to 5, characterized in that: including bleed house steward, coke bin and dust removal mechanism, the end of giving vent to anger of bleed house steward pass through coke bin air inlet branch pipe with the inlet end intercommunication in coke bin, the exhaust end in coke bin passes through coke bin air outlet branch pipe and dust removal mechanism's inlet end intercommunication, still includes one of at least following:
the two ends of the drying gas bypass pipe are respectively communicated with the gas outlet end of the gas-guiding main pipe and the coke bin exhaust branch pipe, a drying gas bypass flow regulating valve is arranged on the drying gas bypass pipe, and the opening degree of the drying gas bypass flow regulating valve is adjusted according to data fed back by a second temperature sensor in the dust removal mechanism;
the atmosphere bypass pipe is communicated with the air-bleed main pipe and is provided with an atmosphere flow regulating valve;
and the air-entraining branch pipe assembly is communicated with the air inlet end of the air-entraining main pipe and is used for adjusting the temperature of the drying air input into the air-entraining main pipe.
7. The drying device according to claim 6, wherein a safety valve, a first temperature sensor, a first pressure sensor, an induced draft fan and a harmful gas detector are arranged on the air-entraining header pipe, the safety valve, the atmosphere bypass pipe and the induced draft fan are sequentially arranged along the flow direction of the drying air, and the opening degree of the atmosphere flow regulating valve is adjusted according to data fed back by the first temperature sensor, the first pressure sensor and the harmful gas detector.
8. The drying device according to claim 6, characterized in that the bleed air branch pipe assembly comprises two bleed air branch pipes arranged in parallel, each bleed air branch pipe is provided with a bleed air flow regulating valve, an air inlet end of each bleed air branch pipe is respectively communicated with a drying air source with temperature difference, and an air outlet end of each bleed air branch pipe is communicated with an air inlet end of the bleed air main pipe.
9. The drying device according to claim 6, wherein the dust removing mechanism comprises a second pressure sensor, a second temperature sensor, a dust removing bag and a dust removing fan which are installed on the coke bin exhaust branch pipe, an inlet flow regulating valve and an exhaust flow regulating valve are respectively arranged on the coke bin inlet branch pipe and the coke bin exhaust branch pipe, and the opening degrees of the inlet flow regulating valve and the exhaust flow regulating valve are adjusted according to data fed back by the second temperature sensor and the second pressure sensor.
10. The drying apparatus according to claim 6, wherein the number of the coke bins is at least one, when the number of the coke bins is greater than or equal to two, each coke bin is correspondingly provided with a dust removing mechanism and a drying gas bypass pipe, each coke bin exhaust branch pipe is communicated through a pressure equalizing and flow equalizing pipe, and connecting points of the pressure equalizing and flow equalizing pipe, the drying gas bypass pipe and the coke bin exhaust branch pipe are sequentially distributed along the flow direction of the drying exhaust gas.
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