CN115075904A - Waste heat and complementary energy power generation system for iron and steel enterprise - Google Patents
Waste heat and complementary energy power generation system for iron and steel enterprise Download PDFInfo
- Publication number
- CN115075904A CN115075904A CN202210859458.7A CN202210859458A CN115075904A CN 115075904 A CN115075904 A CN 115075904A CN 202210859458 A CN202210859458 A CN 202210859458A CN 115075904 A CN115075904 A CN 115075904A
- Authority
- CN
- China
- Prior art keywords
- steam
- low
- main
- waste heat
- boiler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002918 waste heat Substances 0.000 title claims abstract description 90
- 238000010248 power generation Methods 0.000 title claims abstract description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 36
- 239000010959 steel Substances 0.000 title claims abstract description 36
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 19
- 230000000295 complement effect Effects 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000007789 gas Substances 0.000 claims abstract description 53
- 239000002699 waste material Substances 0.000 claims abstract description 13
- 239000000571 coke Substances 0.000 claims description 28
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 3
- 239000003034 coal gas Substances 0.000 abstract description 12
- 239000007921 spray Substances 0.000 description 8
- 238000003303 reheating Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
-
- 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
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a waste heat and waste energy power generation system for iron and steel enterprises, which comprises a boiler (1), a turbine generator (2), a condensing device (3), a main steam main pipe (4), a low-temperature reheat steam main pipe (5), a high-temperature reheat steam main pipe (6) and a main water supply main pipe (8), wherein the boiler (1) comprises a gas boiler (11) and a waste heat boiler (12), and the turbine generator (2) comprises a high-pressure cylinder (21) and a low-pressure cylinder (22). The waste heat and waste energy power generation system of the iron and steel enterprise can balance power generation load fluctuation caused by coal gas fluctuation or waste heat resource intermittency, dynamic balance of coal gas, waste heat and power generation load is achieved, damage to units due to low-load operation can be effectively prevented, and comprehensive power generation efficiency of multiple units is improved.
Description
Technical Field
The invention relates to the technical field of coal gas power generation and waste heat power generation, in particular to a waste heat and waste energy power generation system for iron and steel enterprises.
Background
A large amount of surplus energy such as waste heat and secondary energy (blast furnace gas, converter gas and coke oven gas) can be generated in the steel production process, and steel enterprises can build self-contained power plants and generate electricity by using the waste heat, the waste pressure and the secondary energy to be used for steel production, so that the operation benefit of the enterprises is improved. In recent years, the parameters of the generator set of the self-contained power plant of a steel mill are improved in stages, the generator set is sequentially subjected to medium temperature and medium pressure (3.43MPa/435 ℃) or lower, and the generating efficiency is less than or equal to 25 percent; the power generation efficiency is about 29 to 31 percent under high temperature and high pressure (8.83MPa/535 ℃); the high temperature and ultrahigh pressure (13.2MPa/535 ℃), and the generating efficiency is about 35-38%; ultra-high temperature and ultra-high pressure (13.2MPa/566 ℃), and the generating efficiency is about 37-39%; at present, the ultra-high temperature subcritical technology is gradually applied to self-contained power plants of steel plants, the technical parameters are improved to 17.5MPa/571 ℃, the power generation efficiency is also improved to 40-41%, and the power generation efficiency is improved by about 30.5% compared with the high-temperature high-pressure technology.
The waste heat power generation and the coal gas power generation are usually two independent units in the iron and steel enterprises, and the two units are different in operation mode, different in unit parameters, difficult to match with each other at the steam turbine side, always separately constructed and used and need larger space area and more personnel operation and maintenance. Units such as blast furnace iron making, converter steel making and the like in iron and steel enterprises can generate a large amount of low-heat value coal gas, but the coal gas has volatility, so that steam generated by a coal gas boiler also has volatility, and when the steam quantity is insufficient, a steam turbine generator unit is operated or stopped at low load, so that the generating efficiency is reduced, the unit is abraded, and the operation cost is increased. In the coking process, the coke ovens are divided into coke ovens for recovering coke oven gas and coke ovens without recovering coke oven gas, and in recent years, the coke ovens without recovering coke oven gas are more and more adopted by users due to unique advantages and are also called clean heat recovery coke ovens. The clean heat recovery coke oven does not recover coke oven gas any more, can generate high-temperature flue gas at about 1100 ℃, and the high-temperature flue gas can generate high-parameter steam through a waste heat boiler.
Disclosure of Invention
In order to integrate waste heat power generation and coal gas power generation, the invention provides a waste heat and waste energy power generation system for a steel enterprise, which can balance power generation load fluctuation caused by coal gas fluctuation or waste heat resource intermittency, realize dynamic balance of coal gas, waste heat and power generation load, effectively prevent damage of low-load operation to units and improve comprehensive power generation efficiency of multiple units.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a waste heat and complementary energy power generation system for iron and steel enterprises comprises a boiler, a steam turbine generator, a condensing device, a main steam main pipe, a low-temperature reheat steam main pipe, a high-temperature reheat steam main pipe and a main water supply main pipe, wherein the boiler comprises a gas boiler and a waste heat boiler, and the steam turbine generator comprises a high-pressure cylinder and a low-pressure cylinder; main steam in the main steam main pipe can enter a high-pressure cylinder of a steam turbine generator, low-temperature reheat steam exhausted from the high-pressure cylinder can enter the low-temperature reheat steam main pipe, low-temperature reheat steam in the low-temperature reheat steam main pipe can enter a boiler and be heated into high-temperature reheat steam and enter the high-temperature reheat steam main pipe, high-temperature reheat steam in the high-temperature reheat steam main pipe can enter a low-pressure cylinder of the steam turbine generator, working steam exhausted from the low-pressure cylinder can enter a condensing device to form condensed water and enter the main water supply main pipe, and the condensed water in the main water supply main pipe can enter the boiler and be heated into the main steam and enter the main steam main pipe.
The gas boiler is an ultra-high temperature subcritical gas boiler, the waste heat boiler is an ultra-high temperature subcritical waste heat boiler, the waste heat boiler comprises a coke oven waste heat boiler and a dry quenching waste heat boiler, and the steam turbine generator is an ultra-high temperature subcritical steam turbine generator.
The steel enterprise waste heat and waste energy power generation system comprises a gas boiler, four coke oven waste heat boilers, a dry quenching waste heat boiler, two steam turbine generators and two condensing devices.
The main steam main pipe is connected with an inlet of the high-pressure cylinder through a main steam first branch pipe, and the low-temperature reheat steam main pipe is connected with an outlet of the high-pressure cylinder through a low-temperature reheat steam first branch pipe.
The boiler contains the reheater, and the female pipe of low temperature reheat steam is connected with the entry of reheater through low temperature reheat steam second branch pipe, and the female pipe of high temperature reheat steam is connected with the exit of reheater through the first branch pipe of high temperature reheat steam.
The high-temperature reheat steam main pipe is connected with an inlet of the low-pressure cylinder through a high-temperature reheat steam second branch pipe, an inlet of the condensing device is connected with an outlet of the low-pressure cylinder through a steam discharge branch pipe, and an outlet of the condensing device is connected with a main water supply main pipe through a condensation water pipeline.
The iron and steel enterprise waste heat complementary energy power generation system further comprises a low-pressure bypass steam main pipe and a low-pressure bypass, a bypass valve is arranged on the low-pressure bypass, an electric control valve is arranged on the high-temperature reheat steam first branch pipe, the inlet end of the low-pressure bypass is connected with the high-temperature reheat steam first branch pipe, the inlet end of the low-pressure bypass is located between the electric control valve and a reheater, and the outlet end of the low-pressure bypass is connected with the low-pressure bypass steam main pipe.
The condensing unit is a condenser and comprises a three-level water spray desuperheater, a low-pressure bypass steam main pipe is connected with the three-level water spray desuperheater through a low-pressure bypass steam branch pipe, and a condensate pump, a deaerator, a deaerating water tank and a water feed pump are sequentially arranged on a condensate pipeline.
The boiler comprises an economizer, a water-cooled wall and a superheater which are connected in sequence, a main water supply main pipe is connected with the economizer through a main water supply branch pipe, a flow distributor is arranged on the main water supply branch pipe, the main steam main pipe is connected with the superheater through a main steam second branch pipe, and an electric regulating valve is arranged on the main steam second branch pipe.
The iron and steel enterprise waste heat complementary energy power generation system further comprises a high-pressure side branch, a bypass valve is arranged on the high-pressure side branch, the inlet end of the high-pressure side branch is connected with a main steam second branch pipe, the inlet end of the high-pressure side branch is located between a main steam main pipe and an electric regulating valve, the outlet end of the high-pressure side branch is connected with a low-temperature reheating steam second branch pipe, a flow distributor is arranged on the low-temperature reheating steam second branch pipe, and the outlet end of the high-pressure side branch is located between the low-temperature reheating steam main pipe and the flow distributor.
The invention has the beneficial effects that: the waste heat and waste energy power generation system of the iron and steel enterprise can balance power generation load fluctuation caused by coal gas fluctuation or waste heat resource intermittency, dynamic balance of coal gas, waste heat and power generation load is achieved, damage to units due to low-load operation can be effectively prevented, and comprehensive power generation efficiency of multiple units is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a waste heat and complementary energy power generation system of a steel enterprise.
Fig. 2 is a schematic view of the left-hand portion of fig. 1.
FIG. 3 is a schematic view of a reheater section in a gas boiler.
FIG. 4 is a schematic view of the economizer, waterwall and superheater sections in a gas boiler.
FIG. 5 is a schematic view of a turbonator site.
The reference numerals are explained below:
1. a boiler; 2. a steam turbine generator; 3. a condensing unit; 4. a main steam main pipe; 5. a low-temperature reheat steam main pipe; 6. a high-temperature reheat steam main pipe; 7. a low pressure bypass steam main pipe; 8. a main water supply main pipe;
11. a gas boiler; 12. a waste heat boiler;
21. a high pressure cylinder; 22. a low pressure cylinder;
31. a steam discharge branch pipe; 32. a condensed water line; 33. a three-stage water spray desuperheater;
41. a main steam first branch pipe; 42. a main steam second branch pipe; 43. a high-pressure bypass circuit;
51. a low temperature reheat steam first branch line; 52. a low temperature reheat steam second branch line;
61. a high temperature reheat steam first branch pipe; 62. a high temperature reheat steam second branch pipe;
71. a low-pressure bypass line; 72. a low pressure bypass steam manifold;
81. a main water supply branch pipe;
91. a bypass valve; 92. an electric control valve; 93. a flow distributor;
101. a reheater; 102. a coal economizer; 103. a water cooled wall; 104. a superheater;
121. a coke oven waste heat boiler; 122. a dry quenching waste heat boiler;
321. a condensate pump; 322. a deaerator and a deaerating water tank; 323. a water pump.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A waste heat and waste energy power generation system for iron and steel enterprises comprises a boiler 1, a turbine generator 2, a condensing device 3, a main steam main pipe 4, a low-temperature reheat steam main pipe 5, a high-temperature reheat steam main pipe 6 and a main water supply main pipe 8, wherein the boiler 1 comprises a gas boiler 11 and a waste heat boiler 12, and the turbine generator 2 comprises a high-pressure cylinder 21 and a low-pressure cylinder 22; the main steam in the main steam main pipe 4 can enter the high-pressure cylinder 21 of the steam turbine generator 2 to do work, the low-temperature reheat steam discharged from the high-pressure cylinder 21 can enter the low-temperature reheat steam main pipe 5, the low-temperature reheat steam in the low-temperature reheat steam main pipe 5 can enter the boiler 1 to be heated into high-temperature reheat steam and enter the high-temperature reheat steam main pipe 6, the high-temperature reheat steam in the high-temperature reheat steam main pipe 6 can enter the low-pressure cylinder 22 of the steam turbine generator 2 to do work, the working steam discharged from the low-pressure cylinder 22 can enter the condensing device 3 to form condensed water and enter the main water supply main pipe 8, and the condensed water in the main water supply main pipe 8 can enter the boiler 1 to be heated into the main steam and enter the main steam main pipe 4, as shown in fig. 1 to 5.
The boiler 1 in the waste heat and waste energy power generation system of the iron and steel enterprise comprises a gas boiler 11 and a waste heat boiler 12, and the gas boiler 11 and the waste heat boiler 12 are integrated. The gas boiler 11 can be an existing ultra-high temperature subcritical gas boiler, the waste heat boiler 12 can be an existing ultra-high temperature subcritical waste heat boiler, the technical parameters of the ultra-high temperature subcritical waste heat boiler are more than 17.5MPa/571 ℃, and the power generation efficiency reaches more than 40% -41%. The exhaust-heat boiler 12 comprises a coke oven exhaust-heat boiler 121 and a dry quenching exhaust-heat boiler 122, and the turbine generator 2 can be an existing ultra-high temperature subcritical turbine generator. The boiler 1 may be a gas boiler 11 or a waste heat boiler 12 (e.g., a coke oven waste heat boiler 121 or a dry quenching waste heat boiler 122), as shown in fig. 1.
The fuel gas source of the gas boiler 11 is from blast furnace gas, converter gas and coke oven gas, the gas boiler 11 can be connected with the blast furnace gas, the converter gas and the coke oven gas, the heat source of the coke oven waste heat boiler 121 is from a coke oven, the coke oven waste heat boiler 121 is connected with the coke oven, the heat source of the dry quenching waste heat boiler 122 is from dry quenching, and the dry quenching waste heat boiler 122 is connected with a dry quenching device. The steel enterprise waste heat and waste energy power generation system can comprise one gas boiler 11, four coke oven waste heat boilers 121, one dry quenching waste heat boiler 122, two steam turbine generators 2 and two condensing devices 3.
In the present embodiment, main steam header 4 is connected to an inlet of high-pressure cylinder 21 through main steam first branch 41, and low-temperature reheat steam header 5 is connected to an outlet of high-pressure cylinder 21 through low-temperature reheat steam first branch 51. The boiler 1 includes a reheater 101, the low temperature reheat steam header 5 is connected to an inlet of the reheater 101 through the low temperature reheat steam second branch pipe 52, and the high temperature reheat steam header 6 is connected to an outlet of the reheater 101 through the high temperature reheat steam first branch pipe 61, as shown in fig. 1 to 5.
In this embodiment, the high temperature reheat steam header 6 is further connected to the inlet of the low pressure cylinder 22 through a high temperature reheat steam second branch pipe 62, the inlet of the condensing unit 3 is connected to the outlet of the low pressure cylinder 22 through a steam discharge branch pipe 31, and the outlet of the condensing unit 3 is connected to the main water header 8 through a condensed water line 32. The connection mode of each boiler 1 (which can be a gas boiler 11, a coke oven waste heat boiler 121 or a dry quenching waste heat boiler 122) and other devices or components can be the same, and each boiler 1 is in parallel connection. The connection mode of each turbonator 2 and other devices or parts can be the same, and each turbonator 2 is connected in parallel.
In this embodiment, the iron and steel enterprise waste heat complementary energy power generation system still includes the female pipe 7 of low pressure bypass steam and the other branch road 71 of low pressure, is equipped with bypass valve 91 on the other branch road 71 of low pressure, is equipped with electrical control valve 92 on the first branch pipe 61 of high temperature reheat steam, and the entry end and the first branch pipe 61 of high temperature reheat steam of the other branch road 71 of low pressure are connected, and the entry end of the other branch road 71 of low pressure is located between electrical control valve 92 and the reheater 101, and the exit end and the female pipe 7 of low pressure bypass steam of the other branch road 71 of low pressure are connected.
In this embodiment, the condensing unit 3 is a condenser, the condensing unit 3 includes a three-level water spray attemperator 33, the low-pressure bypass steam main pipe 7 is connected with the three-level water spray attemperator 33 through a low-pressure bypass steam branch pipe 72, steam in the low-pressure bypass steam main pipe 7 can enter the condensing unit 3 through the low-pressure bypass steam branch pipe 72 and be converted into condensate water, and a condensate water pump 321, a deaerator water tank 322 and a water feed pump 323 are sequentially arranged on the condensate water pipeline 32, as shown in fig. 5.
In this embodiment, the boiler 1 includes an economizer 102, a water wall 103, and a superheater 104 connected in this order, the main water supply header 8 is connected to the economizer 102 through a main water supply branch pipe 81, a flow distributor 93 is provided on the main water supply branch pipe 81, the main steam header 4 is connected to the superheater 104 through a main steam second branch pipe 42, and an electric control valve 92 is provided on the main steam second branch pipe 42.
In this embodiment, steel enterprise's waste heat complementary energy power generation system still includes the other branch road 43 of high pressure, be equipped with bypass valve 91 on the other branch road 43 of high pressure, the entry end and the main steam second branch pipe 42 of the other branch road 43 of high pressure are connected, the entry end of the other branch road 43 of high pressure is located between main steam main pipe 4 and electrical control valve 92, the exit end and the low temperature reheat steam second branch pipe 52 of the other branch road 43 of high pressure are connected, be equipped with flow distributor 93 on the low temperature reheat steam second branch pipe 52, the exit end of the other branch road 43 of high pressure is located between low temperature reheat steam main pipe 5 and flow distributor 93. In addition, electric control valves 92 are arranged on the main steam header 4, the low-temperature reheat steam header 5, the high-temperature reheat steam header 6, the low-pressure bypass steam header 7 and the main water supply header 8.
The above examples include 1 gas boiler 11, 4 coke oven waste heat boilers 121, 1 dry quenching waste heat boiler 122, and 2 turbo generators 2, which are only exemplary embodiments. The system is not necessarily fixed, and may be one gas boiler 11 and one exhaust-heat boiler 12 for one turbonator 2, or may be one gas boiler 11 and a plurality of exhaust-heat boilers 12 for a plurality of turbonators 2. Various changes and modifications may be made without departing from the scope as defined in the claims. The layout optimization of surplus energy and waste heat resources such as rich gas power generation, coke oven flue gas waste heat and dry quenching waste heat power generation and the like and the whole plant self-contained power station can be comprehensively considered.
The working process of the waste heat and complementary energy power generation system of the iron and steel enterprise is described below.
Main steam (571 ℃, 17.5MPa) generated by a superheater 104 of a gas boiler 11 (an ultra-high temperature subcritical gas boiler) and a waste heat boiler 12 respectively enters a main steam main pipe 4, the main steam in the main steam main pipe 4 respectively enters an inlet of a high-pressure cylinder 21 through a main steam first branch pipe 41, after the main steam does work in the high-pressure cylinder 21, low-temperature reheat steam (373 ℃, 4.31MPa) is discharged and enters a low-temperature reheat steam main pipe 5, the low-temperature reheat steam main pipe 5 is communicated with an inlet of a reheater 101 of the boiler, and the low-temperature reheat steam enters the reheater 101 of the boiler to be heated. High-temperature reheat steam (571 ℃, 4.31MPa) generated by a reheater 101 of a boiler enters a high-temperature reheat steam main pipe 6 through a high-temperature reheat steam first branch pipe 61, the high-temperature reheat steam first branch pipe 61 is connected with a low-pressure bypass pipe 71, the low-pressure bypass pipe 71 of each boiler is connected to a low-pressure bypass steam main pipe 7, and the low-pressure bypass steam main pipe 7 is communicated with a three-stage water spray desuperheater 33 of a condenser through a low-pressure bypass steam branch pipe 72; high temperature reheat steam header 6 enters the inlet of low pressure cylinder 22 through high temperature reheat steam second leg 62. High-temperature reheated steam expands in turbonator 2 and does work to heat transfer cooling condenses into water in the condenser, gets into oxygen-eliminating device and deoxidization water tank 322 after further raising the temperature through condensate pump 321 pressure boost, low pressure feed water heater heat transfer, and the oxygen-eliminating device heats the condensate water and the deoxidization is handled the back, and the condensate water gets into the deoxidization water tank. The water from the deaerating water tank enters a water feeding pump 323 for pressurization, and enters a main water feeding main pipe 8 after heat exchange and temperature rise through a high-pressure heater, and the main water feeding main pipe 8 is communicated with the inlet of an economizer 102 of the boiler through a main water feeding branch pipe 81. Main feed water enters an economizer 102 of the boiler, is subjected to heat exchange and temperature rise vaporization through a water wall 103 in the boiler, and is discharged from a superheater 104 of the boiler, so that steam-water circulation is formed, as shown in FIGS. 1 to 5.
The waste heat and energy power generation system for the iron and steel enterprises is characterized in that a gas boiler 11 and a waste heat boiler 12 are respectively communicated with a high-capacity and high-parameter steam turbine generator 2 through a main pipe and a branch pipe, the main pipe with an electric regulating valve 92 is communicated with the boiler side and the steam turbine side, the air inflow of the steam turbine generator 2 can be regulated in real time to keep high-power operation, and the loads of the gas boiler 11 and the waste heat boiler 12 can be balanced in real time to adapt to fluctuation of rich gas.
The two ends of the upper supporting pipe of the main steam main pipe are provided with electric regulating valves 92, high-parameter steam generated by the waste heat boiler 12 and the gas boiler 11 can be distributed into the high-pressure cylinder 21 of each turbonator 2 in a balanced manner, when the gas fluctuates, the gas quantity entering the gas boiler 11 for combustion is increased or reduced, the high-parameter steam generated by the gas boiler 11 is increased or reduced, the steam entering the main steam main pipe 4 of the gas boiler 11 is increased or reduced, and at the moment, if the steam quantity generated by the waste heat boiler 12 is less or more, the flow entering the high-pressure cylinder 21 of the 1# or 2# turbonator 2 can be controlled by using the electric regulating valves 92 on the main pipe, so that the two turbonators 2 are ensured to be in a high-load state and operate efficiently; the high-parameter steam is converted into low-temperature reheat steam after driving the high-pressure cylinder 21 to work, the low-temperature reheat steam is merged into the low-temperature reheat steam main pipe 5 from the outlet of the high-pressure cylinder 21, the low-temperature reheat steam is also matched with the flow rate of the real-time main steam, and the steam flow entering the reheaters 101 of the waste heat boiler 12 and the gas boiler 11 is controlled through the flow rate distributor 93 on the second low-temperature reheat steam branch pipe 52. After the high-temperature reheat steam generated by the reheater 101 of the boiler is merged into the high-temperature reheat steam main pipe 6, the flow entering the low-pressure cylinder 22 of the 1# or 2# steam turbine generator 2 is controlled by the electric control valve 92, so that the two steam turbine generators 2 are both in a high-load state and operate efficiently; the condensed water heated and deoxygenated by the deoxygenator is pressurized by the water feed pump 323, subjected to heat exchange and temperature rise by the high-pressure heater and then enters the main water feed main pipe 8, and the flow entering the coal economizer 102 inlets of the gas boiler 11 and the waste heat boiler 12 is controlled by the flow distributor 93, so that the dynamic balance of a steam-water system is formed.
When the gas boiler 11 or the exhaust-heat boiler 12 is not matched with the operation condition of the steam turbine generator 2, that is, the main steam amount generated by the boiler is greater than the main steam amount required by the steam turbine generator 2, the redundant main steam generated by the boiler can directly enter the low-temperature reheating steam second branch pipes 52 of each boiler through the high-pressure bypass 43 without passing through the high-pressure cylinder 21 of the steam turbine generator 2, the redundant main steam can be merged into the main pipe, and the air inflow of the high-pressure cylinder 21 is adjusted in real time according to the steam turbine load. The high-pressure bypass 43 is provided with a bypass valve 91, the bypass valve 91 (also called as a bypass valve group) comprises a steam valve, a water spray regulating valve and a desuperheating water isolating valve which are connected in sequence, the bypass water spray adopts valve post-spraying, the best cooling effect is achieved through steam atomization, and local scouring and pipeline impact are not generated;
the above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical characteristics, the technical features and the technical scheme, the technical scheme and the technical scheme, and the embodiment of the invention can be freely combined and used.
Claims (10)
1. The steel enterprise waste heat and complementary energy power generation system is characterized by comprising a boiler (1), a turbine generator (2), a condensing device (3), a main steam main pipe (4), a low-temperature reheat steam main pipe (5), a high-temperature reheat steam main pipe (6) and a main water supply main pipe (8), wherein the boiler (1) comprises a gas boiler (11) and a waste heat boiler (12), and the turbine generator (2) comprises a high-pressure cylinder (21) and a low-pressure cylinder (22);
the main steam in the main steam main pipe (4) can enter a high-pressure cylinder (21) of a steam turbine generator (2), the low-temperature reheated steam discharged from the high-pressure cylinder (21) can enter a low-temperature reheated steam main pipe (5), the low-temperature reheated steam in the low-temperature reheated steam main pipe (5) can enter a boiler (1) and be heated into high-temperature reheated steam and enter a high-temperature reheated steam main pipe (6), the high-temperature reheated steam in the high-temperature reheated steam main pipe (6) can enter a low-pressure cylinder (22) of the steam turbine generator (2), the working steam discharged from the low-pressure cylinder (22) can enter a condensing device (3) to form condensed water and enter a main water supply main pipe (8), and the condensed water in the main water supply main pipe (8) can enter the boiler (1) and be heated into the main steam and enter the main steam main pipe (4).
2. The waste heat and waste energy power generation system of the iron and steel enterprise as claimed in claim 1, characterized in that the gas boiler (11) is an ultra-high temperature subcritical gas boiler, the waste heat boiler (12) is an ultra-high temperature subcritical waste heat boiler, the waste heat boiler (12) comprises a coke oven waste heat boiler (121) and a dry quenching waste heat boiler (122), and the turbine generator (2) is an ultra-high temperature subcritical turbine generator.
3. The steel enterprise waste heat and waste energy power generation system according to claim 1, comprising one gas boiler (11), four coke oven waste heat boilers (121), one dry quenching waste heat boiler (122), two steam turbine generators (2) and two condensing units (3).
4. The steel enterprise waste heat and energy power generation system according to claim 1, wherein the main steam main pipe (4) is connected with an inlet of the high pressure cylinder (21) through a main steam first branch pipe (41), and the low temperature reheat steam main pipe (5) is connected with an outlet of the high pressure cylinder (21) through a low temperature reheat steam first branch pipe (51).
5. The steel enterprise waste heat and energy power generation system according to claim 1, wherein the boiler (1) comprises a reheater (101), the low temperature reheat steam main pipe (5) is connected with an inlet of the reheater (101) through a low temperature reheat steam second branch pipe (52), and the high temperature reheat steam main pipe (6) is connected with an outlet of the reheater (101) through a high temperature reheat steam first branch pipe (61).
6. The power generation system by waste heat and energy of iron and steel enterprises as claimed in claim 5, wherein the high-temperature reheat steam main pipe (6) is further connected with the inlet of the low-pressure cylinder (22) through a high-temperature reheat steam second branch pipe (62), the inlet of the condensing device (3) is connected with the outlet of the low-pressure cylinder (22) through a steam discharge branch pipe (31), and the outlet of the condensing device (3) is connected with the main water supply main pipe (8) through a condensed water pipeline (32).
7. The steel enterprise waste heat and energy power generation system according to claim 6, further comprising a low-pressure bypass steam main pipe (7) and a low-pressure bypass branch pipe (71), wherein a bypass valve (91) is arranged on the low-pressure bypass branch pipe (71), an electric control valve (92) is arranged on the high-temperature reheated steam first branch pipe (61), the inlet end of the low-pressure bypass branch pipe (71) is connected with the high-temperature reheated steam first branch pipe (61), the inlet end of the low-pressure bypass branch pipe (71) is located between the electric control valve (92) and the reheater (101), and the outlet end of the low-pressure bypass branch pipe (71) is connected with the low-pressure bypass steam main pipe (7).
8. The steel enterprise waste heat and waste energy power generation system according to claim 7, wherein the condensing device (3) is a condenser, the condensing device (3) comprises a three-level water spraying desuperheater (33), the low-pressure bypass steam main pipe (7) is connected with the three-level water spraying desuperheater (33) through a low-pressure bypass steam branch pipe (72), and a condensate water pump (321), a deaerator, a deaerating water tank (322) and a water feeding pump (323) are sequentially arranged on the condensate water pipeline (32).
9. The steel enterprise waste heat and complementary energy power generation system according to claim 5, wherein the boiler (1) comprises an economizer (102), a water wall (103) and a superheater (104) which are connected in sequence, a main water supply main pipe (8) is connected with the economizer (102) through a main water supply branch pipe (81), a flow distributor (93) is arranged on the main water supply branch pipe (81), a main steam main pipe (4) is connected with the superheater (104) through a main steam second branch pipe (42), and an electric regulating valve (92) is arranged on the main steam second branch pipe (42).
10. The steel enterprise waste heat and energy power generation system according to claim 9, further comprising a high-pressure bypass branch (43), wherein a bypass valve (91) is arranged on the high-pressure bypass branch (43), the inlet end of the high-pressure bypass branch (43) is connected with the main steam second branch (42), the inlet end of the high-pressure bypass branch (43) is located between the main steam main pipe (4) and the electric control valve (92), the outlet end of the high-pressure bypass branch (43) is connected with the low-temperature reheat steam second branch (52), the low-temperature reheat steam second branch (52) is provided with a flow distributor (93), and the outlet end of the high-pressure bypass branch (43) is located between the low-temperature reheat steam main pipe (5) and the flow distributor (93).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210859458.7A CN115075904A (en) | 2022-07-21 | 2022-07-21 | Waste heat and complementary energy power generation system for iron and steel enterprise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210859458.7A CN115075904A (en) | 2022-07-21 | 2022-07-21 | Waste heat and complementary energy power generation system for iron and steel enterprise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115075904A true CN115075904A (en) | 2022-09-20 |
Family
ID=83241890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210859458.7A Pending CN115075904A (en) | 2022-07-21 | 2022-07-21 | Waste heat and complementary energy power generation system for iron and steel enterprise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115075904A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115853609A (en) * | 2022-12-26 | 2023-03-28 | 东方电气集团东方汽轮机有限公司 | Iron-making process waste heat gradient comprehensive utilization system and method |
-
2022
- 2022-07-21 CN CN202210859458.7A patent/CN115075904A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115853609A (en) * | 2022-12-26 | 2023-03-28 | 东方电气集团东方汽轮机有限公司 | Iron-making process waste heat gradient comprehensive utilization system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101403322B (en) | Supercritical steam combined cycle and method | |
| US6497102B2 (en) | Method for supplementing a saturated steam generation system having at least one steam turbine set, and steam power plant supplemented using the method | |
| CN112240232B (en) | Steam power plant, method for modifying steam power plant, and method for operating steam power plant | |
| CN108625911A (en) | A kind of therrmodynamic system promoting thermal power plant unit electricity output regulating power | |
| CN110686227B (en) | Intermediate reheat steam power generation system | |
| CN104061027B (en) | The high temperature steam-extracting cooling system of Double reheat steam turbine thermodynamic system | |
| CN113446863A (en) | Comprehensive utilization system and method for waste heat in coking production process | |
| CN112594667A (en) | System and method for adjusting reheat steam temperature of high-temperature ultrahigh-pressure reheat dry quenching boiler | |
| CN112502800A (en) | Flexible large-scale high-parameter heat supply system of thermal power plant | |
| CN110630345B (en) | Heat recovery coke oven waste heat power generation system based on mother pipe | |
| CN112762427A (en) | Multisource industrial steam supply switching system and method based on lowest coal consumption cost | |
| CN104533554A (en) | Novel high-efficiency regenerative feedwater heating system for single-reheating unit | |
| CN111206968A (en) | Subcritical complementary energy waste heat recovery power generation system of steel plant and working method thereof | |
| CN115075904A (en) | Waste heat and complementary energy power generation system for iron and steel enterprise | |
| CN113175367B (en) | Master control system for improving peak regulation capacity and flexibility of unit and operation method | |
| CN104456519A (en) | Novel efficient water supply heat recovery system for secondary reheating unit | |
| EP3077632A1 (en) | Combined cycle system | |
| CN210264838U (en) | Water-spraying temperature-reducing heat and power decoupling operation system of cogeneration unit | |
| CN211174241U (en) | Heat recovery coke oven waste heat power generation system based on main pipe system | |
| CN217602734U (en) | Waste heat and complementary energy power generation system for iron and steel enterprise | |
| US6460325B2 (en) | Method of converting a system generating saturated steam, having at least one steam turbine group, and power station converted in accordance with the method | |
| CN211372365U (en) | System is utilized to rich coal gas high efficiency of iron and steel enterprise | |
| CN215444170U (en) | Cold-section steam multistage utilization system for enhancing industrial steam supply capacity of once-through boiler | |
| CN214223075U (en) | Novel desuperheating water system of million tower boiler superheater and reheater | |
| CN113175368B (en) | Boiler steam turbine interconnection system based on main pipe system transformation and operation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |