CN110630345A - Heat recovery coke oven waste heat power generation system based on main pipe system - Google Patents
Heat recovery coke oven waste heat power generation system based on main pipe system Download PDFInfo
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- CN110630345A CN110630345A CN201910992548.1A CN201910992548A CN110630345A CN 110630345 A CN110630345 A CN 110630345A CN 201910992548 A CN201910992548 A CN 201910992548A CN 110630345 A CN110630345 A CN 110630345A
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- 239000002918 waste heat Substances 0.000 title claims abstract description 209
- 239000000571 coke Substances 0.000 title claims abstract description 147
- 238000010248 power generation Methods 0.000 title claims abstract description 72
- 238000011084 recovery Methods 0.000 title claims abstract description 67
- 238000010791 quenching Methods 0.000 claims description 38
- 230000000171 quenching effect Effects 0.000 claims description 38
- 238000003303 reheating Methods 0.000 claims description 38
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000009833 condensation Methods 0.000 description 10
- 230000005494 condensation Effects 0.000 description 10
- 238000004939 coking Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Turbines (AREA)
- Coke Industry (AREA)
Abstract
The invention relates to a heat recovery coke oven waste heat power generation system based on a main pipe system, wherein a coke oven waste heat boiler outputs high-pressure waste heat steam to a high-pressure main steam main pipe through a first main steam pipeline, the high-pressure main steam main pipe is communicated with a high-pressure cylinder, an outlet of the high-pressure cylinder is communicated with a low-temperature reheat steam main pipe, the low-temperature reheat steam main pipe outputs low-temperature steam to the coke oven waste heat boiler through a low-temperature steam pipeline, the coke oven waste heat boiler outputs high-temperature reheat steam to the high-temperature reheat steam main pipe through a high-temperature reheat pipeline, the first main steam pipeline is communicated with the low-temperature steam pipeline through a first high-pressure side branch, and the high-temperature reheat pipeline is communicated with a low-; the circulation capacity of the first high-pressure bypass and the low-pressure bypass is the main steam flow of a single coke oven waste heat boiler. The system is arranged based on a main pipe system, can recover the waste heat of the heat recovery coke oven with full energy and high efficiency, and has low failure rate and stable waste heat recovery.
Description
Technical Field
The invention relates to the technical field of heat recovery coke ovens, in particular to a heat recovery coke oven waste heat power generation system based on a main pipe system.
Background
In the production process of the heat recovery type coke oven, two high-quality waste heat resources can be mainly used for generating steam for power generation. One is that the high-temperature flue gas of the heat recovery coke oven generates steam through a waste heat boiler; one is matched with a dry quenching waste heat boiler to generate steam. The existing technical scheme is that the two waste heat power generation systems are respectively made into independent systems, and the problems of large occupied area, high total investment, high operation cost and the like exist.
In the prior art, steam parameters of the waste heat boiler are mostly medium-temperature and medium-pressure parameters, and the power generation efficiency is low. With the increasing application of high-temperature ultrahigh-pressure generator sets to gas power generation systems of metallurgical enterprises, the parameters of waste heat power generation steam of a coke-oven plant gradually adopt high-temperature ultrahigh-pressure parameters so as to improve the power generation efficiency. In order not to influence the production of the coking process and protect the power generation system, the power generation system is provided with a bypass or a standby system. Because the steam parameter of the high-temperature ultrahigh-pressure generator set is high, a multistage bypass system needs to be arranged.
In the prior art, a coking waste heat power generation bypass system is provided, high-temperature ultrahigh-pressure main steam coming out of 4 coke oven waste heat boilers is converged into a main pipe and then enters a high-pressure cylinder of 1 turbo generator unit to perform expansion work, low-temperature reheat steam coming out of the high-pressure cylinder respectively returns to reheaters of the 4 waste heat boilers through the main pipe, the reheated steam becomes high-temperature reheat steam after being reheated and then is converged into a main pipe and then enters a low-pressure cylinder of the turbo generator to perform expansion work, and exhaust steam enters a condenser to be condensed and recovered. The system comprises a high-pressure bypass system and a low-pressure bypass system, wherein the high-pressure bypass system leads a high-pressure bypass from a main steam main pipe, a high-pressure bypass device is arranged on the high-pressure bypass system, the main steam is subjected to temperature and pressure reduction and then is connected to a low-temperature reheating steam main pipe, and the maximum flow of the bypass is the steam flow of a single waste heat boiler; the low-pressure bypass system is characterized in that a low-pressure bypass is led from a high-temperature reheat steam main pipe, a low-pressure bypass device is arranged on the low-pressure bypass, the high-temperature reheat steam is subjected to temperature reduction and pressure reduction and then is connected to a condenser, and the maximum flow of the bypass is the steam flow of a single waste heat boiler. When the first waste heat boiler is started and the steam turbine is not started, in order to avoid dry burning of a corresponding reheater, main steam enters a low-temperature reheater pipeline to enter the boiler reheater after being subjected to temperature and pressure reduction through the high-pressure bypass device to become high-temperature reheated steam, and then enters the condenser for condensation and recovery after being subjected to temperature and pressure reduction through the low-pressure bypass device. The inlet of the condenser is provided with a three-level temperature and pressure reduction device.
The coking waste heat power generation bypass system has the following problems:
1) the high-low pressure bypass circulation capacity of the system is the steam flow of a single waste heat boiler and is mainly used when the system is started; when a turbine fault occurs during the operation of a plurality of waste heat boilers and the turbine is tripped, the high-pressure and low-pressure bypasses cannot pass through all steam flow, and part of the waste heat boilers can only be used for emergency load reduction and shutdown or other spare turbine units. Steam is released by emergency furnace shutdown to cause water resource loss and waste; and the spare unit scheme has high investment.
2) The power generation system is used for generating power by aiming at all coke oven waste heat boilers and does not contain dry quenching coke waste heat. The dry quenching waste heat power generation is another independent system. The two sets of steam turbine generator units occupy large area, have high investment and operation cost, complex system and large operation and maintenance amount.
Therefore, the inventor provides a heat recovery coke oven waste heat power generation system based on a main pipe system by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a heat recovery coke oven waste heat power generation system based on a main pipe system, which overcomes the problems that the bypass circulation capacity limits energy recovery, the fault is easy to occur and the like in the prior art.
The invention also aims to provide a heat recovery coke oven waste heat power generation system based on a main pipe system, which integrates a heat recovery coke oven waste heat boiler, a dry quenching coke waste heat boiler and a high-temperature ultrahigh-pressure generator set into a system, simplifies the system, has strong comprehensiveness, reduces the investment, and saves the occupied area and the operation cost.
The invention aims to realize the heat recovery coke oven waste heat power generation system based on the main pipe system, which comprises a low-temperature reheat steam main pipe, a high-pressure main steam main pipe, a low-pressure bypass steam main pipe, a steam turbine power generation set and at least one coke oven waste heat boiler, wherein: the steam turbine power generation set comprises a high-pressure cylinder, a low-pressure cylinder, a generator and a condenser; the single coke oven waste heat boiler outputs high-pressure waste heat steam to the high-pressure main steam main pipe through a first main steam pipeline, the outlet of the high-pressure main steam main pipe is communicated with the high-pressure cylinder, the outlet of the high-pressure cylinder is communicated with the low-temperature reheat steam main pipe, the low-temperature reheat steam main pipe outputs low-temperature steam to the coke oven waste heat boiler through a low-temperature steam pipeline, the single coke oven waste heat boiler outputs high-temperature reheat steam to the high-temperature reheat steam main pipe through a high-temperature reheat pipeline, the first main steam pipeline can be communicated with the low-temperature steam pipeline on the same coke oven waste heat boiler through a first high-pressure bypass, and the high-temperature reheat pipeline can be communicated with the low-pressure bypass steam main pipe through a low-pressure bypass; the outlet of the low-pressure bypass steam main pipe and the low-pressure cylinder are both communicated with the condenser; the circulation capacities of the first high-pressure bypass and the low-pressure bypass are the main steam flow of the corresponding single coke oven waste heat boiler.
In a preferred embodiment of the present invention, the heat recovery coke oven waste heat power generation system based on the main pipe system further includes at least one dry quenching waste heat boiler, the dry quenching waste heat boiler outputs high-pressure waste heat steam to the high-pressure main steam main pipe through a second main steam pipeline, a second high-pressure bypass is communicated with the second main steam pipeline, and an outlet of the second high-pressure bypass is communicated with the low-temperature reheat steam main pipe; and the circulation capacity of the second high-pressure side branch is the main steam flow of the corresponding single dry quenching waste heat boiler.
In a preferred embodiment of the present invention, a first high-pressure side branch device capable of controlling on-off is disposed on the first high-pressure side branch, a low-pressure side branch device capable of controlling on-off is disposed on the low-pressure side branch, and the flow capacities of the first high-pressure side branch device and the low-pressure side branch device are the main steam flow of the corresponding single coke oven waste heat boiler.
In a preferred embodiment of the present invention, a second high-pressure bypass device capable of controlling on-off is disposed on the second high-pressure bypass, and a circulation capacity of the second high-pressure bypass device is a main steam flow rate of a corresponding single dry quenching exhaust-heat boiler.
In a preferred embodiment of the present invention, a third-level bypass device is disposed at an inlet of the condenser, and the low-pressure bypass steam main is communicated with the condenser through the third-level bypass device.
In a preferred embodiment of the present invention, the master pipe based heat recovery coke oven waste heat power generation system includes two sets of coke oven waste heat boiler sets, each set of coke oven waste heat boiler set includes at least one coke oven waste heat boiler, the number of the steam turbine power generation sets is 2, and each set of coke oven waste heat boiler set corresponds to 1 set of the steam turbine power generation set; the low-temperature reheating steam main pipe, the high-pressure main steam main pipe and the low-pressure bypass steam main pipe are respectively provided with a stop valve, the low-temperature reheating steam main pipe, the high-pressure main steam main pipe and the low-pressure bypass steam main pipe are located on two sides of the stop valves and are respectively communicated with 1 steam turbine power generation unit, and every 3 coke oven waste heat boilers and the steam turbine power generation units corresponding to the coke oven waste heat boilers are mutually standby.
In a preferred embodiment of the present invention, the heat recovery coke oven waste heat power generation system based on the main pipe system further includes 1 dry quenching waste heat boiler, a second main steam pipeline communicated with the dry quenching waste heat boiler is divided into 2 steam passages, and the 2 steam passages are respectively communicated with the high temperature reheat steam main pipe at two sides of the shut-off valve.
In a preferred embodiment of the present invention, one side of the shut-off valve is set as a first side, and the other side of the shut-off valve is set as a second side; the second main steam pipeline is communicated with the low-temperature reheating steam main pipe on the first side through the second high-pressure side branch, and the maximum circulation capacity of the low-temperature steam pipelines of the 3 coke oven waste heat boilers on the first side is the sum of the main steam flow of a single coke oven waste heat boiler and the steam flow of the 1/3 dry quenching waste heat boiler.
In a preferred embodiment of the present invention, a flow rate adjusting device is disposed on the low-temperature steam pipeline.
In a preferred embodiment of the present invention, the flow regulating device is a regulating valve.
From the above, the heat recovery coke oven waste heat power generation system based on the header pipe has the following beneficial effects:
the heat recovery coke oven waste heat power generation system based on the header pipe system is arranged based on the header pipe system, the circulation capacity of the first high-pressure side branch and the low-pressure side branch are the main steam flow of the corresponding single waste heat boiler, a 100% flow high-low pressure large bypass system is formed, the waste heat of the heat recovery coke oven can be recovered with full energy and high efficiency, the failure rate of equipment is low, and the waste heat recovery is stable; in the system, high-temperature steam of the coke oven waste heat boiler can be subjected to temperature and pressure reduction and return to the coke oven waste heat boiler from a first main steam pipeline through a first high-pressure side branch and a low-temperature steam pipeline, the high-temperature steam is changed into high-temperature reheated steam through the coke oven waste heat boiler, the high-temperature reheated steam enters a condenser for condensation and recovery after being subjected to temperature and pressure reduction through a low-pressure side branch, and when a steam turbine set is in fault trip, the steam is not released, and all the steam is; the waste heat boiler is not stopped, and the normal operation of the waste heat boiler and the coking process production is ensured;
according to the heat recovery coke oven waste heat power generation system based on the main pipe system, the heat recovery coke oven waste heat boiler, the dry quenching coke waste heat boiler and the high-temperature ultrahigh-pressure generator set are integrated into one system, so that the system is simplified, the investment is reduced, and the occupied area and the operation cost are saved; the coke oven waste heat boiler is a waste heat boiler with a reheating system, and the coke dry quenching waste heat boiler is a waste heat boiler without the reheating system; in the system, steam of the dry quenching waste heat boiler can enter a low-temperature reheating steam main pipe through a second high-pressure side branch, the steam returns to the coke oven waste heat boiler through a low-temperature steam pipeline to become high-temperature reheating steam, the high-temperature reheating steam enters a condenser for condensation and recovery after temperature and pressure reduction through a low-pressure side branch, and when a steam turbine set breaks down and trips, the steam is not released and all the steam is condensed and recovered.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: the invention is a schematic diagram of a heat recovery coke oven waste heat power generation system based on a header pipe.
In the figure:
100. a heat recovery coke oven waste heat power generation system based on a main pipe system;
1. a low-temperature reheat steam main pipe;
2. a high-temperature reheat steam main pipe;
3. a high pressure main steam main pipe;
4. a low pressure bypass steam main pipe;
5. a steam turbine power generation set; 51. a high pressure cylinder; 52. a low pressure cylinder; 53. a generator; 54. a condenser; 541. a tertiary bypass device;
6. a coke oven waste heat boiler; 61. a first main steam line; 62. a low temperature steam line; 63. a high temperature reheat pipeline; 64. a first high pressure bypass; 641. a first high-pressure bypass device; 65. a low-pressure bypass line; 651. a low-voltage bypass device;
7. a dry quenching waste heat boiler; 71. a second main steam line; 72. a second high-pressure bypass line; 721. a second high pressure bypass device;
8. and (6) cutting off the valve.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
The specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the present invention provides a header-based heat recovery coke oven waste heat power generation system 100, which includes a low-temperature reheat steam header 1, a high-temperature reheat steam header 2, a high-pressure main steam header 3, a low-pressure bypass steam header 4, a steam turbine power generation set 5, and at least one coke oven waste heat boiler 6 (coke oven waste heat boilers 6 are usually multiple in the waste heat recovery process), in a specific embodiment of the present invention, the pipeline engineering parameters are as follows: the temperature of the low-temperature reheating steam main pipe 1 is 360 ℃, and the pressure is 3.04 MPa; the temperature of the high-temperature reheating steam main pipe 2 is 545 ℃ and the pressure is 2.765 MPa; the temperature of the high-pressure main steam main pipe 3 is 545 ℃ and the pressure is 13.7 MPa; the temperature of the low-pressure bypass steam main pipe 4 is 160 ℃, and the pressure is 0.5 MPa; the temperature of the high-pressure bypass (including a first high-pressure bypass and a second high-pressure bypass which are described later) is 360 ℃, and the pressure is 3.04 MPa; wherein: the steam turbine power generation set 5 comprises a high-pressure cylinder 51, a low-pressure cylinder 52, a generator 53 and a condenser 54, and in the embodiment, the steam turbine power generation set 5 is a high-temperature ultrahigh-pressure generator set; each coke oven waste heat boiler 6 outputs high-pressure waste heat steam to a high-pressure main steam main pipe 3 through a first main steam pipeline 61 (a single coke oven waste heat boiler 6 outputs high-pressure waste heat steam to the high-pressure main steam main pipe 3 through a first main steam pipeline 61), the outlet of the high-pressure main steam main pipe 3 is communicated with a high-pressure cylinder 51, the outlet of the high-pressure cylinder 51 is communicated with a low-temperature reheating steam main pipe 1, the low-temperature reheating steam main pipe 1 outputs low-temperature steam to the coke oven waste heat boilers 6 through low-temperature steam pipelines 62 (each waste heat boiler 6 is communicated with a low-temperature steam pipeline 62), each coke oven waste heat boiler 6 outputs high-temperature reheating steam to a high-temperature reheating steam main pipe 2 through a high-temperature reheating pipeline 63 (the single coke oven waste heat boiler 6 outputs high-temperature reheating steam to the high-temperature reheating steam main pipe 2 through a high-temperature reheating pipeline 63), each first main steam pipeline 61 can be respectively communicated with a low-temperature steam pipeline 62 on the same coke oven waste heat boiler 6 through a first high-pressure bypass 64, and each high-temperature reheat pipeline 63 can be respectively communicated with a low-pressure bypass steam main pipe 4 through a low-pressure bypass 65; the outlet of the low-pressure bypass steam main pipe 4 and the low-pressure cylinder 52 are both communicated with a condenser 54; the flow capacity of each first high-pressure bypass 64 and each low-pressure bypass 65 is the main steam flow of the corresponding single coke oven waste heat boiler 6.
The heat recovery coke oven waste heat power generation system based on the header pipe system is arranged based on the header pipe system, the circulation capacity of the first high-pressure side branch and the low-pressure side branch are the main steam flow of the corresponding single waste heat boiler, a 100% flow high-low pressure large bypass system is formed, the waste heat of the heat recovery coke oven can be recovered with full energy and high efficiency, the failure rate of equipment is low, and the waste heat recovery is stable; in the system, high-temperature steam of a coke oven waste heat boiler can be subjected to temperature reduction and pressure reduction from a first main steam pipeline through a first high-pressure side branch and a low-temperature steam pipeline and then returns to the coke oven waste heat boiler, the high-temperature steam is changed into high-temperature reheat steam through the coke oven waste heat boiler (a reheater is arranged in the coke oven waste heat boiler, the prior art), the high-temperature reheat steam is subjected to temperature reduction and pressure reduction through a low-pressure side branch and then enters a condenser for condensation and recovery, and when a steam turbine set fails and trips, the steam is not released and; the waste heat boiler is not stopped, and the normal operation of the waste heat boiler and the coking process production is ensured.
Further, as shown in fig. 1, the heat recovery coke oven waste heat power generation system 100 based on the main pipe system further includes at least one dry quenching waste heat boiler 7, the dry quenching waste heat boiler 7 outputs high-pressure waste heat steam to the high-pressure main steam main pipe 3 through a second main steam pipeline 71, a second high-pressure bypass pipe 72 is arranged on the second main steam pipeline 71 in a communicating manner, and an outlet of the second high-pressure bypass pipe 72 is communicated with the low-temperature reheat steam main pipe 1; the flow capacity of the second high-pressure bypass 72 is the main steam flow of the single dry quenching exhaust-heat boiler 7.
For the convenience of system switching, the first main steam pipeline 61, the low-temperature steam pipeline 62, the high-temperature reheating pipeline 63, the first high-pressure bypass 64, the low-pressure bypass 65, the second main steam pipeline 71 and the second high-pressure bypass 72 are all provided with switch valves.
According to the heat recovery coke oven waste heat power generation system based on the main pipe system, the heat recovery coke oven waste heat boiler, the dry quenching coke waste heat boiler and the high-temperature ultrahigh-pressure generator set are integrated into one system, so that the system is simplified, the investment is reduced, and the occupied area and the operation cost are saved; the coke oven waste heat boiler is a waste heat boiler with a reheating system, and the coke dry quenching waste heat boiler is a waste heat boiler without the reheating system; in the system, steam of the dry quenching waste heat boiler can enter a low-temperature reheating steam main pipe through a second high-pressure side branch, returns to the coke oven waste heat boiler through a low-temperature steam pipeline, and is changed into high-temperature reheating steam through the coke oven waste heat boiler (a reheater is arranged in the coke oven waste heat boiler, and the high-temperature reheating steam enters a condenser for condensation and recovery after being subjected to temperature reduction and pressure reduction through a low-pressure side branch, and when a steam turbine unit is in fault trip, the steam is not released, and all the steam is condensed and recovered.
Further, as shown in fig. 1, the first high-pressure bypass 64 is provided with a first high-pressure bypass device 641 capable of controlling on/off, the low-pressure bypass 65 is provided with a low-pressure bypass device 651 capable of controlling on/off, and the flow capacities of the first high-pressure bypass device 641 and the low-pressure bypass device 651 correspond to the main steam flow rate of the single coke oven waste heat boiler 6. The first high-pressure bypass device 641 and the low-pressure bypass device 651 respectively control the on-off of the first high-pressure bypass 64 and the low-pressure bypass 65, and in order to meet the flow demand and ensure the efficiency requirement, the flow capacity of the first high-pressure bypass device 641 and the flow capacity of the low-pressure bypass device 651 are the same as the flow capacity of the first high-pressure bypass 64 and the low-pressure bypass 65.
Further, as shown in fig. 1, a second high-pressure bypass device 721 capable of controlling on-off is arranged on the second high-pressure bypass 72, and the circulation capacity of the second high-pressure bypass device 721 is the main steam flow of the single dry quenching waste heat boiler 7. To meet the flow demand and ensure efficiency requirements, the flow capacity of the second high pressure bypass device 721 is set to be the same as the flow capacity of the second high pressure bypass 72.
Further, as shown in fig. 1, a tertiary bypass device 541 is provided at an inlet of the condenser 54, and the low-pressure bypass steam header 4 is communicated with the condenser 54 through the tertiary bypass device 541.
As shown in fig. 1, the heat recovery coke oven waste heat power generation system based on the master pipe system comprises two groups of coke oven waste heat boiler groups, each group of coke oven waste heat boiler groups comprises at least one coke oven waste heat boiler, in a specific embodiment of the present invention, the heat recovery coke oven waste heat power generation system 100 based on the master pipe system comprises 6 coke oven waste heat boilers 6, and each group of coke oven waste heat boiler groups comprises 3 coke oven waste heat boilers 6; the number of the steam turbine power generation sets 5 is 2, each coke oven waste heat boiler set, namely, each 3 coke oven waste heat boilers 6 corresponds to 1 steam turbine power generation set (not limited to 6 coke oven waste heat boilers +1 dry quenching waste heat boiler, 6 coke oven waste heat boilers can be in other numbers); all set up trip valve 8 on low temperature reheat steam female pipe 1, high temperature reheat steam female pipe 2, high pressure main steam female pipe 3 and the female pipe 4 of low pressure bypass steam, low temperature reheat steam female pipe 1, high temperature reheat steam female pipe 2, high pressure main steam female pipe 3 and the female both sides that 4 are located trip valve 8 of low pressure bypass steam communicate with 1 group of steam turbine power generation group 5 respectively, and every 3 coke oven exhaust-heat boiler 6 and the steam turbine power generation group 5 that corresponds are each other for reserve. The heat recovery coke oven waste heat power generation system 100 based on the main pipe system is arranged based on the main pipe system, a plurality of ovens are arranged for two machines, mutual standby can be realized, and the system adjustment is more flexible.
Heat recovery coke oven waste heat power generation system based on header system still includes 1 dry quenching exhaust-heat boiler 7, and the second main steam pipeline 71 that communicates on the dry quenching exhaust-heat boiler 7 divide into 2 steam access, and 2 steam access communicate with the both sides that high temperature reheat steam header 2 is located trip valve 8 respectively.
Setting one side of the cut-off valve 8 as a first side and the other side of the cut-off valve 8 as a second side; the second main steam pipeline 71 is communicated with the low-temperature reheating steam main pipe 1 on the first side through a second high-pressure bypass pipeline 72, and the maximum flow capacity of the low-temperature steam pipelines 62 of the 3 coke oven waste heat boilers 6 on the first side is the sum of the main steam flow of a single coke oven waste heat boiler 6 and the steam flow of the 1/3 dry quenching waste heat boiler 7.
Further, a flow regulating device is arranged on the low-temperature steam pipeline 62, and the flow of the reheat steam can be flexibly regulated according to the operation load of each coke oven waste heat boiler. In the present embodiment, the flow rate adjusting device is a regulating valve.
When the heat recovery coke oven waste heat power generation system 100 based on the header pipe system of the present embodiment is used for waste heat recovery, in a normal working state, each shut valve 8 is in a closed state, and the first high-pressure bypass device 641 on each first high-pressure bypass 64 is in a closed state; high-pressure waste heat steam of each coke oven waste heat boiler 6 is respectively output to the high-pressure main steam main pipe 3 on the corresponding side through the respective first main steam pipeline 61, a coke dry quenching waste heat boiler 7 is respectively output to the high-pressure main steam main pipe 3 on the corresponding side through 2 steam passages through the second main steam pipeline 71, the high-pressure waste heat steam in the high-pressure main steam main pipes 3 on the two sides respectively enters the high-pressure cylinders 51 of the steam turbine power generation sets 5 on the two sides, the high-pressure waste heat steam expands in each high-pressure cylinder 51 to work and then becomes low-temperature steam, the low-temperature steam formed in each high-pressure cylinder 51 respectively enters the corresponding side of the low-temperature reheating steam main pipe 1, and the low-temperature steam in the low-temperature reheating steam main pipe 1 is output and returned to each coke oven waste; the low-temperature steam is reheated by each coke oven exhaust-heat boiler 6 and then changed into high-temperature reheat steam, the high-temperature reheat steam is output to the high-temperature reheat steam main pipe 2 on the corresponding side through each high-temperature reheat pipeline 63, the high-temperature reheat steam in the high-temperature reheat steam main pipes 2 on the two sides respectively enters the low-pressure cylinders 52 of the steam turbine power generation sets 5 on the two sides, and the high-temperature reheat steam is expanded in each low-pressure cylinder 52 to do work and then enters the condenser 54 for condensation and recovery.
When the steam turbine set fails, the high-temperature steam of each coke oven waste heat boiler 6 can be returned to the coke oven waste heat boiler 6 from the respective first main steam pipeline 61 through the first high-pressure bypass 64 and the low-temperature steam pipeline 62 for temperature and pressure reduction, the high-temperature steam is changed into high-temperature reheat steam through the coke oven waste heat boiler 6, and the high-temperature reheat steam enters the condenser 54 for condensation and recovery after being subjected to temperature and pressure reduction through the low-pressure bypass 65; high-temperature steam of the dry quenching waste heat boiler 7 can enter the low-temperature reheating steam main pipe 1 through the second high-pressure bypass 72, enters the coke oven waste heat boiler 6 through the low-temperature steam pipeline 62 to be changed into high-temperature reheating steam, and enters the condenser 54 for condensation and recovery after being subjected to temperature reduction and pressure reduction through the low-pressure bypass 65.
From the above, the heat recovery coke oven waste heat power generation system based on the header pipe has the following beneficial effects:
the heat recovery coke oven waste heat power generation system based on the header pipe system is arranged based on the header pipe system, the circulation capacity of the first high-pressure side branch and the low-pressure side branch are the main steam flow of the corresponding single waste heat boiler, a 100% flow high-low pressure large bypass system is formed, the waste heat of the heat recovery coke oven can be recovered with full energy and high efficiency, the failure rate of equipment is low, and the waste heat recovery is stable; in the system, high-temperature steam of the coke oven waste heat boiler can be subjected to temperature and pressure reduction and return to the coke oven waste heat boiler from a first main steam pipeline through a first high-pressure side branch and a low-temperature steam pipeline, the high-temperature steam is changed into high-temperature reheated steam through the coke oven waste heat boiler, the high-temperature reheated steam enters a condenser for condensation and recovery after being subjected to temperature and pressure reduction through a low-pressure side branch, and when a steam turbine set is in fault trip, the steam is not released, and all the steam is; the waste heat boiler is not stopped, and the normal operation of the waste heat boiler and the coking process production is ensured;
according to the heat recovery coke oven waste heat power generation system based on the main pipe system, the heat recovery coke oven waste heat boiler, the dry quenching coke waste heat boiler and the high-temperature ultrahigh-pressure generator set are integrated into one system, so that the system is simplified, the investment is reduced, and the occupied area and the operation cost are saved; the coke oven waste heat boiler is a waste heat boiler with a reheating system, and the coke dry quenching waste heat boiler is a waste heat boiler without the reheating system; in the system, steam of the dry quenching waste heat boiler can enter a low-temperature reheating steam main pipe through a second high-pressure side branch, the steam returns to the coke oven waste heat boiler through a low-temperature steam pipeline to become high-temperature reheating steam, the high-temperature reheating steam enters a condenser for condensation and recovery after temperature and pressure reduction through a low-pressure side branch, and when a steam turbine set breaks down and trips, the steam is not released and all the steam is condensed and recovered.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (10)
1. The utility model provides a heat recovery coke oven waste heat power generation system based on header pipe system, its characterized in that includes the header pipe of low temperature reheat steam, the header pipe of high pressure main steam, the header pipe of low pressure bypass steam, steam turbine power generation group and an at least coke oven exhaust-heat boiler, wherein:
the steam turbine power generation set comprises a high-pressure cylinder, a low-pressure cylinder, a generator and a condenser;
the single coke oven waste heat boiler outputs high-pressure waste heat steam to the high-pressure main steam main pipe through a first main steam pipeline, the outlet of the high-pressure main steam main pipe is communicated with the high-pressure cylinder, the outlet of the high-pressure cylinder is communicated with the low-temperature reheat steam main pipe, the low-temperature reheat steam main pipe outputs low-temperature steam to the coke oven waste heat boiler through a low-temperature steam pipeline, the single coke oven waste heat boiler outputs high-temperature reheat steam to the high-temperature reheat steam main pipe through a high-temperature reheat pipeline, the first main steam pipeline can be communicated with the low-temperature steam pipeline on the same coke oven waste heat boiler through a first high-pressure bypass, and the high-temperature reheat pipeline can be communicated with the low-pressure bypass steam main pipe through a low-pressure bypass; the outlet of the low-pressure bypass steam main pipe and the low-pressure cylinder are both communicated with the condenser;
the circulation capacities of the first high-pressure bypass and the low-pressure bypass are the main steam flow of the corresponding single coke oven waste heat boiler.
2. The master pipe system-based heat recovery coke oven waste heat power generation system of claim 1, further comprising at least one dry quenching waste heat boiler, wherein the dry quenching waste heat boiler outputs high-pressure waste heat steam to the high-pressure main steam master pipe through a second main steam pipeline, a second high-pressure bypass is communicated with the second main steam pipeline, and an outlet of the second high-pressure bypass is communicated with the low-temperature reheat steam master pipe; and the circulation capacity of the second high-pressure side branch is the main steam flow of the corresponding single dry quenching waste heat boiler.
3. The header-pipe-based heat recovery coke oven waste heat power generation system of claim 2, wherein a first high-pressure bypass device capable of being controlled to be turned on and off is arranged on the first high-pressure bypass, a low-pressure bypass device capable of being controlled to be turned on and off is arranged on the low-pressure bypass, and the flow capacity of the first high-pressure bypass device and the flow capacity of the low-pressure bypass device are the main steam flow of the corresponding single coke oven waste heat boiler.
4. The master-pipe-based heat recovery coke oven waste heat power generation system of claim 3, wherein a second high-pressure bypass device capable of controlling on-off is arranged on the second high-pressure bypass, and the circulation capacity of the second high-pressure bypass device is the main steam flow of a corresponding single dry quenching waste heat boiler.
5. The header pipe based heat recovery coke oven waste heat power generation system of claim 4, wherein a tertiary bypass device is arranged at an inlet of the condenser, and the low-pressure bypass steam header pipe is communicated with the condenser through the tertiary bypass device.
6. The master-pipe-based heat recovery coke oven waste heat power generation system of claim 5, wherein the master-pipe-based heat recovery coke oven waste heat power generation system comprises two groups of coke oven waste heat boiler groups, each group of the coke oven waste heat boiler groups comprises at least one coke oven waste heat boiler, the number of the steam turbine power generation groups is 2, and each group of the coke oven waste heat boiler groups corresponds to 1 group of the steam turbine power generation groups; the low-temperature reheating steam main pipe, the high-pressure main steam main pipe and the low-pressure bypass steam main pipe are respectively provided with a stop valve, the low-temperature reheating steam main pipe, the high-pressure main steam main pipe and the low-pressure bypass steam main pipe are located on two sides of the stop valves and are respectively communicated with 1 steam turbine power generation unit, and every 3 coke oven waste heat boilers and the steam turbine power generation units corresponding to the coke oven waste heat boilers are mutually standby.
7. The master pipe based heat recovery coke oven waste heat power generation system of claim 6, further comprising 1 dry quenching coke oven waste heat boiler, wherein a second main steam pipeline communicated with the dry quenching coke oven waste heat boiler is divided into 2 steam passages, and the 2 steam passages are respectively communicated with the high temperature reheat steam master pipe at two sides of the stop valve.
8. The header pipe based heat recovery coke oven waste heat power generation system of claim 7, wherein one side of the shut-off valve is set as a first side and the other side of the shut-off valve is set as a second side; the second main steam pipeline is communicated with the low-temperature reheating steam main pipe on the first side through the second high-pressure side branch, and the maximum circulation capacity of the low-temperature steam pipelines of the 3 coke oven waste heat boilers on the first side is the sum of the main steam flow of a single coke oven waste heat boiler and the steam flow of the 1/3 dry quenching waste heat boiler.
9. The master pipe based heat recovery coke oven waste heat power generation system of claim 1, wherein a flow regulating device is provided on the low temperature steam pipeline.
10. The master pipe based heat recovery coke oven cogeneration system of claim 9, wherein the flow regulating device is a regulating valve.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114377526A (en) * | 2022-01-25 | 2022-04-22 | 福建三钢闽光股份有限公司 | Control method of header system coke oven flue gas recovery system |
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