CN116426298A - Medium-pressure saturated steam kinetic energy recovery process for coke oven riser waste heat production - Google Patents
Medium-pressure saturated steam kinetic energy recovery process for coke oven riser waste heat production Download PDFInfo
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- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 136
- 239000002918 waste heat Substances 0.000 title claims abstract description 44
- 239000000571 coke Substances 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 238000011084 recovery Methods 0.000 title description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 230000000630 rising effect Effects 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 7
- 239000008236 heating water Substances 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 8
- 238000010248 power generation Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 16
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 12
- 238000004939 coking Methods 0.000 description 9
- 229910021529 ammonia Inorganic materials 0.000 description 8
- 238000004821 distillation Methods 0.000 description 8
- 239000002699 waste material Substances 0.000 description 7
- 230000001174 ascending effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000006837 decompression Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000012824 chemical production Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
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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
- C10B27/00—Arrangements for withdrawal of the distillation gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to the technical field of coke oven riser waste heat utilization, in particular to a process for recovering kinetic energy of medium-pressure saturated steam generated by the coke oven riser waste heat, which comprises the following steps that S1, desalted water is deoxidized by a deaerator and then is sent into a steam drum for mixing, and the steam drum water flows out from the lower part of the steam drum and is sent to a riser heater for heating; s2, heating water by the rising pipe heater to generate medium-pressure saturated steam, absorbing the heat of the raw coal to become a steam-water mixture, and returning the steam mixture to the steam drum; s3, the medium-pressure saturated steam at the upper part of the steam drum is sent to a saturated steam turbine dragging device to do work, and the steam after doing work is merged into a low-pressure steam main pipe network. The invention avoids the problems of waste heat exchange area and reduced steam production caused by heating saturated steam by using the rising pipe, omits three-stage energy conversion of generating superheated steam for generating electricity and using electric dragging equipment, improves the utilization rate of rising pipe waste heat, meets the requirement of a subsequent workshop on low-pressure steam quantity, and greatly reduces the operation cost.
Description
Technical Field
The invention relates to the technical field of coke oven riser waste heat utilization, in particular to a process for recovering kinetic energy of medium-pressure saturated steam generated by the coke oven riser waste heat.
Background
In recent years, along with the continuous increase of energy-saving and consumption-reducing demands of coke ovens, the technology of a coke oven riser waste heat recovery system is widely applied to coke oven production, and the recovered waste heat is used for producing steam for coking and downstream product demands, so that the coke cost can be reduced by 6-15 yuan/t, and the technology has become the standard of newly built coke ovens and reformed coke ovens in the coking industry.
At present, the technology is realized by the following two modes: firstly, directly producing low-pressure saturated steam with the pressure of 0.5-0.8Mpa or producing medium-pressure saturated steam with the pressure of 1.2-2.0Mpa, directly decompressing to 1.0Mpa or converting into low-pressure saturated steam, and merging the low-pressure saturated steam into a low-pressure steam pipe network or using the low-pressure saturated steam for heat supply; secondly, saturated steam with the pressure of 1.2-1.6MPa is produced through heat exchange, distributed in a branch cylinder, and one part of the saturated steam enters a deaerator of the system for deaeration through decompression; part of the oil enters an oil-rich heat exchanger to heat the oil-rich to 180 ℃; part of the ammonia water enters an ammonia distillation heat exchanger to heat the ammonia water to 120-130 ℃; part of the superheated steam enters a rising pipe to be subjected to secondary superheating to generate superheated steam with the temperature of more than 400 ℃, and the superheated steam enters a wash oil regenerator to regenerate wash oil; the rest saturated steam is merged into an external pipe network to complete the effect of completely replacing the pipe furnace. The above process route can realize the purpose of recovering the waste heat of the rising pipe of the coke oven.
With the application of more and more waste heat recovery technologies, the steam inside a coking enterprise, especially low-quality low-pressure saturated steam, is gradually changed from the existence of gaps to the occurrence of surplus. Taking a coking enterprise with annual output of 150-250 ten thousand tons as an example, the surplus steam amount is generally 10-20 t/h. How to find proper application for surplus steam becomes a problem to be solved by coking workers.
CN202211197526.4 discloses a process for utilizing surplus steam in coking enterprises, wherein deoxygenated water is divided into two paths, one path of deoxygenated water is pressurized by a boiler feed pump and then is sent to a dry quenching waste heat boiler, superheated steam is generated after the heat of circulating gas is absorbed in the dry quenching waste heat boiler, the superheated steam is sent to a turbine generator set in a dry quenching Jiao Qilun power station, and the turbine head enters a turbine for power generation; the other way of deoxygenated water is pressurized by a drum feed pump and then is sent to a drum in a coke oven riser system, mixed with drum water and then flows out from the lower part of the drum, and then is sent to a first riser heat exchanger for producing saturated steam by being pressurized by a forced circulation pump, and the heat of the waste coal is absorbed and changed into a steam-water mixture and then returned to the drum; the saturated steam at the upper part of the steam drum is divided into two paths, one path of saturated steam enters a saturated steam pipe network of 0.4-0.6 MPa after the pressure of the saturated steam is regulated by a pressure reducing valve, the other path of steam enters a rising pipe heat exchanger II for heat exchange, and then enters a steam turbine through a steam supplementing port for power generation. The defect of the patent is that (1) in the technical scheme of the patent, the rising pipe heat exchanger is divided into two parts, wherein one part of low-pressure saturated steam with the pressure of 0.4-0.6 MPa is produced and is merged into a low-pressure steam pipe network for supplementing low-pressure steam, and the other part of low-pressure saturated steam is used for producing medium-pressure superheated steam and is sent to a dry quenching steam turbine for power generation. The low-pressure saturated steam with the temperature of 0.4-0.6 MPa is less than or equal to 165 ℃, the steam grade is low, and the low-pressure saturated steam can only be used for pipeline heat tracing, reservoir area heating, direct ammonia distillation and the like, cannot be directly applied to heating of crude benzene rich oil, and has a narrow application range; (2) In the technical scheme, a part of rising pipe heaters are independently utilized to carry out secondary heating on the produced low-pressure saturated steam, high-temperature superheated steam is produced, the heat exchange area of the rising pipe heaters is wasted, the total amount of waste heat extracted by a coke oven rising pipe is reduced, a large amount of available waste heat is brought into a subsequent device by raw gas, energy waste is caused, the total steam yield is reduced, and the running cost of the rising pipe waste heat recovery device and the subsequent cooling device is increased; (3) The grid-connected low-pressure steam generated by the system is low in yield, and the requirements of other projects on low-pressure steam cannot be met. (4) The patent utilizes the rising pipe heater to generate superheated steam to generate electricity by the steam turbine, then drives the motor to do work, and converts energy three times, so that the utilization rate of the rising pipe waste heat is low, and part of energy and heat are consumed.
CN202123295115.2 discloses a short flow device of a riser waste heat recovery tube furnace. The system comprises a split cylinder, a rising pipe superheater, an oil-rich heat exchanger, an ammonia distillation heat exchanger, a desalted water pipe, a first condensate tank, a second condensate tank and a plurality of sets of rising pipe heat exchange circulating systems, wherein the inlet of the first condensate tank only comprises a first inlet A connected with the oil-rich heat exchanger and a first inlet B directly connected with the desalted water pipe, the inlet of the second condensate tank only comprises a second inlet A connected with the ammonia distillation heat exchanger and a second inlet B directly connected with the desalted water pipe, the outlets of the first condensate tank and the second condensate tank are respectively connected to each set of rising pipe heat exchange circulating systems through electric regulating valves, the outlet of the split cylinder only comprises a split cylinder outlet A connected with the rising pipe superheater, a split cylinder outlet B connected with the oil-rich heat exchanger and a split cylinder outlet C connected with the ammonia distillation heat exchanger, and the inlet of the split cylinder is respectively connected with each set of rising pipe heat exchange circulating systems. The device produces saturated steam with the pressure of 1.2-1.6MPa through heat exchange, distributes the saturated steam in a branch cylinder, and part of the saturated steam enters a deaerator of the system through decompression to deoxidize; part of the oil enters an oil-rich heat exchanger to heat the oil-rich to 180 ℃; part of the ammonia water enters an ammonia distillation heat exchanger to heat the ammonia water to 120-130 ℃; part of the superheated steam enters a rising pipe to be subjected to secondary superheating to generate superheated steam with the temperature of more than 400 ℃, and the superheated steam enters a wash oil regenerator to regenerate wash oil; the rest saturated steam is merged into an external pipe network to complete the effect of completely replacing the pipe furnace. The defect of the patent is that (1) in the technical scheme of the patent, a rising pipe heat exchanger is divided into two parts, one part is used for producing low-pressure saturated steam with the pressure of 1.2-1.6MPa, the low-pressure saturated steam exchanges heat with ammonia distillation and rich oil, the other part is directly decompressed and then is sent to a deaerator for heating and deoxidizing, and the other part is used for producing medium-pressure superheated steam and is sent to crude benzene for regenerating wash oil. The low-pressure saturated steam with pressure of 1.2-1.6MPa is directly decompressed and heated, so that the waste of steam kinetic energy is caused. (2) In the technical scheme, a part of rising pipe heater is independently utilized to carry out secondary heating on produced low-pressure saturated steam, high-temperature superheated steam is produced, the heat exchange area of the rising pipe heater is wasted, the total amount of waste heat extracted by a coke oven rising pipe is reduced, a large amount of available waste heat is brought into a subsequent device by raw gas, energy waste is caused, the total steam yield is greatly reduced, and the running cost of the rising pipe waste heat recovery device and the subsequent cooling device is increased. (3) The grid-connected low-pressure steam generated by the system is low in yield, and the requirements of other projects on low-pressure steam cannot be met.
In conclusion, the waste heat of the rising pipe of the coke oven is not fully and effectively utilized in the prior art, so that energy waste is caused, and the production cost is increased.
Disclosure of Invention
The invention provides a process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven ascending pipe, which aims at the technical problem that the waste heat of the ascending pipe of the coke oven is not effectively utilized, and can improve the utilization rate of the waste heat of the ascending pipe, save energy and reduce production cost.
The invention provides a process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser, which comprises the following steps,
s1, deoxidizing desalted water by a deoxidizer, feeding the deoxidized water into a steam drum, mixing, and feeding the steam drum water flowing out from the lower part of the steam drum to a riser heater for heating;
s2, heating water by the rising pipe heater to generate medium-pressure saturated steam, absorbing the heat of the raw coal to become a steam-water mixture, and returning the steam mixture to the steam drum;
s3, the medium-pressure saturated steam at the upper part of the steam drum is sent to a saturated steam turbine dragging device to do work, and the steam after doing work is merged into a low-pressure steam main pipe network.
Further, in step S1, the conductivity of the desalted water is < 5us/cm.
Further, the steam used by the deaerator in the step S1 is from a low-pressure steam main pipe network or the steam subjected to work in the step S3, and the water temperature after deaeration of the deaerator is 103.5-105 ℃ so as to ensure a good thermal deaeration effect.
In step S2, the pressure of the medium-pressure saturated steam is 1.8-3.0 MPa (gauge pressure). All the steam generated by the riser heater is medium-pressure saturated steam, the steam pressure is 1.8-3.0 Mpa (gauge pressure), and the steam is not subjected to secondary heating and heat treatment.
Further, in step S3, the saturated steam turbine dragging device includes a saturated steam turbine set and a dragged device.
Further, in step S3, the saturated steam turbine dragging device includes one of a saturated steam turbine group, a motor dragging device, a driven device, a reverse power generation device, and a saturated steam turbine group, a driven device, and a reverse power generation device.
Further, in step S3, the dragged device includes one of a circulating water pump, a low-temperature water pump, a circulating ammonia water pump, a gas blower, a desulfurizing liquid circulating pump, and a large mother liquid pump.
Further, in step S2, the pressure of the saturated medium-pressure steam is reduced to 0.6-1.0 Mpa (gauge pressure) after acting, so as to ensure that the low-pressure steam has sufficient temperature and grade, and avoid affecting the operation effects of ammonia distillation, crude benzene and other steam consuming devices.
Further, the invention adopts the following devices: comprises a deaerator, a steam drum, a riser heater and a saturated steam turbine dragging device;
the water inlet at the bottom of the deaerator is connected with a desalted water inlet pipeline, and the water outlet at the bottom of the deaerator is connected with the water inlet at the bottom of the steam drum through a pipeline;
the steam turbine dragging device comprises a saturated steam turbine unit, a water outlet at the bottom of the steam drum is connected with a water inlet of a rising pipe heater through a pipeline, a water outlet of the rising pipe heater is connected with a steam inlet of the saturated steam turbine unit through a pipeline, and a steam outlet of the saturated steam turbine unit is integrated into a low-pressure steam main pipe network through a pipeline.
Further, the dragging device of the saturated steam turbine is provided with a bypass pipeline, and a remote pressure gauge, a regulating valve and a pressure reducing valve are sequentially arranged on the bypass pipeline from a high pressure side to a low pressure side, and are in pressure interlocking. The purpose is that when the pressure of the medium-pressure saturated steam exceeds the set range, the regulating valve is automatically opened or closed to decompress, so that overload operation of the saturated steam turbine dragging device is avoided.
The invention has the beneficial effects that: according to the medium-pressure saturated steam kinetic energy recovery process for producing the waste heat of the rising pipe of the coke oven, provided by the invention, the medium-pressure saturated steam produced by the rising pipe of the coke oven is utilized to directly drag the equipment to do work, so that the problems of waste of heat exchange area and reduction of steam production caused by heating saturated steam to produce superheated steam by utilizing the rising pipe are avoided, three-stage energy conversion of producing the superheated steam for generating electricity again and using the electric dragging equipment is omitted, the utilization rate of the waste heat of the rising pipe is improved, the requirement of a follow-up workshop on low-pressure steam quantity is met, and the operation cost is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure, a 1-deoxidization water supply pump, a 2-deoxidizer, a 3-steam drum water supply pump, a 4-steam drum, a 5-forced circulation pump, a 6-riser heater, a 7-saturated steam turbine dragging device, an 8-regulating valve and a 9-pressure reducing valve are arranged.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
As shown in fig. 1, the process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser provided by the invention adopts the following devices: comprises a deaerator 2, a steam drum 4, a riser heater 6 and a saturated steam turbine dragging device 7;
the water inlet at the bottom of the deaerator 2 is connected with a demineralized water inlet pipeline, a deaeration water supply pump 1 is arranged on the demineralized water inlet pipeline, the water outlet at the bottom of the deaerator 2 is connected with the water inlet at the bottom of the steam drum 4 through a pipeline, and the connecting pipeline of the deaerator 2 and the steam drum 4 is provided with a steam drum water supply pump 3;
the saturated steam turbine dragging device 7 comprises a saturated steam turbine set and a dragged device, a water outlet at the bottom of the steam drum 4 is connected with a water inlet of the riser heater 6 through a pipeline, a forced circulation pump 5 is arranged on a pipeline connecting the steam drum 4 and the riser heater 6, the water outlet of the riser heater 6 is connected with a steam inlet of the saturated steam turbine set through a pipeline, and a steam outlet of the saturated steam turbine set is integrated into a low-pressure steam main pipe network through a pipeline.
The saturated steam turbine dragging device 7 is provided with a bypass pipeline, a remote pressure gauge, a regulating valve 8 and a pressure reducing valve 9 are sequentially arranged on the bypass pipeline from the high pressure side to the low pressure side, the remote pressure gauge and the regulating valve 8 are provided with pressure interlocking, and when the medium pressure steam pressure exceeds a first set threshold value, the regulating valve 8 is automatically opened to reduce pressure, so that overload operation of the saturated steam turbine dragging device 7 is avoided; when the medium pressure steam pressure is lower than a second set threshold value, the regulating valve 8 is automatically closed to stop bypass decompression, so that the saturated steam turbine dragging device 7 is ensured to have enough steam to do work.
Example 2
Taking 150 ten thousand tons/year coke oven riser waste heat recovery dragging production workshop circulating water pump as an example, the coke oven riser waste heat production medium-pressure saturated steam kinetic energy recovery process provided by the invention comprises the following steps:
desalted water (conductivity is less than 5 us/cm) is pumped to a water inlet of the deaerator through deoxidized water supply pump and high-temperature deoxidization is carried out in the deaerator; deoxygenated water with the temperature of about 104 ℃ is discharged from an outlet at the bottom of the deoxygenator, is pressurized by a drum water supply pump and is sent into the drum, mixed with drum water and flows out from the lower part of the drum, is pressurized by a forced circulation pump and is sent to an ascending pipe heater to produce medium-pressure saturated steam with the pressure of 2.2Mpa (gauge pressure), and is returned to the drum after absorbing the heat of raw coal to become a steam-water mixture. The 2.2Mpa (gauge pressure) medium pressure saturated steam at the upper part of the steam bag is sent to a saturated steam turbine dragging device for doing work, the saturated steam turbine dragging device is a saturated steam turbine set (output power 366 KW) +a circulating water pump (matched power 366 KW), the steam pressure after doing work is reduced to 1.0Mpa (gauge pressure) and is merged into a low pressure steam main pipe network for heating of coking and other devices; the saturated steam turbine dragging device 7 is provided with a steam bypass pipeline, and redundant steam is sequentially regulated by the bypass pipeline and is decompressed to 1.0Mpa (gauge pressure) and then is merged into a low-pressure steam main pipe network.
All the rising pipe heaters of the embodiment generate medium pressure saturated steam of 2.2Mpa, the steam is not subjected to secondary heating and overheating treatment, the steam generation of the medium pressure steam reaches about 15.7t/h, and the steam generation amount of ton coke is about 100kg. In the embodiment, the pressure of the low-pressure saturated steam after the pressure of the low-pressure saturated steam is reduced by the saturated steam turbine dragging device is 1.0Mpa, the steam quantity is 15t/h, and the low-pressure steam is completely integrated into a low-pressure steam pipe network for heating and using in chemical production workshops and other devices.
Example 3
Taking 150 ten thousand tons/year coke oven riser waste heat recovery dragging production workshop circulating ammonia water pump as an example, the coke oven riser waste heat medium pressure saturated steam kinetic energy recovery process provided by the invention comprises the following steps:
desalted water (conductivity is less than 5 us/cm) is pumped to a water inlet of the deaerator through deoxidized water supply pump and high-temperature deoxidization is carried out in the deaerator; deoxygenated water with the temperature of about 103 ℃ is discharged from an outlet at the bottom of the deoxygenator, is pressurized by a drum water supply pump and is sent into the drum, mixed with drum water and flows out from the lower part of the drum, is pressurized by a forced circulation pump and is sent to an ascending pipe heater to produce medium-pressure saturated steam with the pressure of 2.8Mpa (gauge pressure), and is returned to the drum after absorbing the heat of raw coal to become a steam-water mixture. The 2.8Mpa (gauge pressure) medium pressure saturated steam at the upper part of the steam bag is sent to a saturated steam turbine dragging device for doing work, the saturated steam turbine dragging device is a saturated steam turbine set (output power 366 KW) +a circulating ammonia water pump (matched power 315 KW) +a reverse power generation device (matched power 50 KW), and the steam pressure after doing work is reduced to 0.8Mpa (gauge pressure) and is merged into a low pressure steam main pipe network for heating of coking and other devices; the saturated steam turbine dragging device 7 is provided with a steam bypass pipeline, and redundant steam is sequentially regulated by the bypass pipeline and is decompressed to 0.8Mpa (gauge pressure) and then is merged into a low-pressure steam main pipe network.
All the rising pipe heaters of the embodiment generate medium pressure saturated steam with the pressure of 2.8Mpa, the steam is not subjected to secondary heating and overheating treatment, the steam generation of the medium pressure steam reaches about 15.7t/h, and the steam generation amount of ton coke is about 100kg. In the embodiment, the pressure of the low-pressure saturated steam after the pressure of the low-pressure saturated steam is reduced by the saturated steam turbine dragging device is 0.8Mpa, the steam quantity is 15.2t/h, and the low-pressure steam is completely integrated into a low-pressure steam pipe network for heating and using in chemical production workshops and other devices.
Example 4
Taking 150 ten thousand tons/year coke oven riser waste heat recovery dragging production workshop circulating water pump as an example, the coke oven riser waste heat production medium-pressure saturated steam kinetic energy recovery process provided by the invention comprises the following steps:
desalted water (conductivity is less than 5 us/cm) is pumped to a water inlet of the deaerator through deoxidized water supply pump and high-temperature deoxidization is carried out in the deaerator; deoxygenated water with the temperature of about 104 ℃ is discharged from an outlet at the bottom of the deoxygenator, is pressurized by a drum water supply pump and is sent into the drum, mixed with drum water and flows out from the lower part of the drum, is pressurized by a forced circulation pump and is sent to an ascending pipe heater to produce medium-pressure saturated steam with the pressure of 2.0Mpa (gauge pressure), and is returned to the drum after absorbing the heat of raw coal to become a steam-water mixture. The 2.0Mpa (gauge pressure) medium pressure saturated steam at the upper part of the steam bag is sent to a saturated steam turbine dragging device for doing work, the saturated steam turbine dragging device is a saturated steam turbine set (output power 366 KW) +a circulating water pump (matched power 450 KW), and the steam pressure after doing work is reduced to 0.8Mpa (gauge pressure) and is merged into a low pressure steam main pipe network for heating of coking and other devices; the saturated steam turbine dragging device 7 is provided with a steam bypass pipeline, and redundant steam is sequentially regulated by the bypass pipeline and is decompressed to 0.8Mpa (gauge pressure) and then is merged into a low-pressure steam main pipe network.
In the embodiment, the design pressure of the steam drum is 2.5Mpa, the steam generated by all riser heaters is medium pressure saturated steam of 2.0Mpa, the steam is not subjected to secondary heating and heat treatment, the steam generation of the medium pressure steam reaches about 15.7t/h, and the steam generation amount of ton coke is about 100kg. In the embodiment, the pressure of the low-pressure saturated steam after the pressure of the medium-pressure saturated steam is reduced by the saturated steam turbine dragging device is 0.8Mpa, and the low-pressure steam is completely integrated into a low-pressure steam pipe network.
Comparative example 1
Comparative example 1 differs from example 4 in that after the saturated steam in the steam drum is directly depressurized to 0.8Mpa by a depressurization valve, part (about 1.9 t/h) is used for heating by the deaerator, and the rest about 13.8t/h is supplied to a low-pressure steam main pipe network, and no work is performed by a saturated steam turbine dragging device.
Comparative example 2
Comparative example 2 differs from example 4 in that the medium pressure saturated steam fraction of 2.0Mpa (about 8 t/h) in the drum is sent to the crude benzene heating rich oil; after the residual medium-pressure saturated steam is depressurized to 0.8Mpa, part (about 1.9 t/h) is used for heating by the deaerator, and the residual medium-pressure saturated steam is supplied to a low-pressure steam main pipe network for about 1t/h, and does not do work by a saturated steam turbine dragging device.
The economic benefits produced using the schemes of example 4, comparative example 1, and comparative example 2 are shown in Table 1.
TABLE 1 economic benefit specific data generated by various schemes
As can be seen from Table 1, the medium pressure saturated steam direct dragging device produced by the riser in example 4 of the present invention has higher economic benefit than other schemes, and the running cost of coke products is greatly reduced.
The invention directly drags the equipment to apply work by utilizing part of the kinetic energy of the medium-pressure steam generated by the residual heat of the rising pipe, converts part of the kinetic energy into mechanical energy, has higher energy utilization rate, avoids the waste of the kinetic energy of the steam caused by direct decompression, and has obvious energy-saving effect. Through theoretical calculation, rated output power of the saturated medium-pressure steam dragging equipment under different working conditions is shown in table 2.
Table 2 rated output power data for saturated medium pressure steam dragging devices under different conditions
As can be seen from Table 2, the saturated medium-pressure steam produced by the invention has larger kinetic energy, and the part of kinetic energy is utilized to apply work so as to meet the actual production requirement and achieve the purposes of energy conservation and consumption reduction.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (10)
1. The process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser is characterized by comprising the following steps of,
s1, deoxidizing desalted water by a deoxidizer, feeding the deoxidized water into a steam drum, mixing, and feeding the steam drum water flowing out from the lower part of the steam drum to a riser heater for heating;
s2, heating water by the rising pipe heater to generate medium-pressure saturated steam, absorbing the heat of the raw coal to become a steam-water mixture, and returning the steam mixture to the steam drum;
s3, the medium-pressure saturated steam at the upper part of the steam drum is sent to a saturated steam turbine dragging device to do work, and the steam after doing work is merged into a low-pressure steam main pipe network.
2. The process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser tube according to claim 1, wherein in the step S1, the conductivity of desalted water is less than 5us/cm.
3. The process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser tube as claimed in claim 1, wherein the steam used by the deaerator in the step S1 is from a low-pressure steam main pipe network or the steam after working in the step S3, and the water temperature after deaeration of the deaerator is 103.5-105 ℃.
4. The process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser tube according to claim 1, wherein in the step S2, the pressure of the medium-pressure saturated steam is 1.8-3.0 MPa.
5. The process for recovering kinetic energy of medium-pressure saturated steam generated by residual heat of a coke oven riser as claimed in claim 1, wherein in the step S3, the dragging device of the saturated steam turbine comprises a saturated steam turbine set and a dragged device.
6. The process for recovering kinetic energy of medium-pressure saturated steam generated by residual heat of a coke oven riser as claimed in claim 1, wherein in the step S3, the saturated steam turbine dragging device comprises one of a saturated steam turbine group, a motor dragging device, a driven device, a reverse power generation device or a saturated steam turbine group, a driven device and a reverse power generation device.
7. The process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser tube according to claim 5 or 6, wherein in the step S3, the dragged equipment comprises one of a circulating water pump, a low-temperature water pump, a circulating ammonia water pump, a gas blower, a desulfurizing liquid circulating pump and a large mother liquid pump.
8. The process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser tube according to claim 1, wherein in the step S2, the pressure of the medium-pressure saturated steam is reduced to 0.6-1.0 Mpa after acting.
9. The process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser tube according to claim 1, wherein the following devices are adopted: comprises a deaerator, a steam drum, a riser heater and a saturated steam turbine dragging device;
the water inlet at the bottom of the deaerator is connected with a desalted water inlet pipeline, and the water outlet at the bottom of the deaerator is connected with the water inlet at the bottom of the steam drum through a pipeline;
the steam turbine dragging device comprises a saturated steam turbine unit, a water outlet at the bottom of the steam drum is connected with a water inlet of a rising pipe heater through a pipeline, a water outlet of the rising pipe heater is connected with a steam inlet of the saturated steam turbine unit through a pipeline, and a steam outlet of the saturated steam turbine unit is integrated into a low-pressure steam main pipe network through a pipeline.
10. The process for recovering kinetic energy of medium-pressure saturated steam generated by waste heat of a coke oven riser as claimed in claim 9, wherein the saturated steam turbine dragging device is provided with a bypass pipeline, and a remote pressure gauge, a regulating valve and a pressure reducing valve are sequentially arranged on the bypass pipeline from a high pressure side to a low pressure side, and the remote pressure gauge is in pressure interlocking with the regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310358268.1A CN116426298A (en) | 2023-03-31 | 2023-03-31 | Medium-pressure saturated steam kinetic energy recovery process for coke oven riser waste heat production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310358268.1A CN116426298A (en) | 2023-03-31 | 2023-03-31 | Medium-pressure saturated steam kinetic energy recovery process for coke oven riser waste heat production |
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| CN202310358268.1A Pending CN116426298A (en) | 2023-03-31 | 2023-03-31 | Medium-pressure saturated steam kinetic energy recovery process for coke oven riser waste heat production |
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