CN115288816B - Starting optimization system and method for combined cycle multistage recovery machine island waste heat - Google Patents
Starting optimization system and method for combined cycle multistage recovery machine island waste heat Download PDFInfo
- Publication number
- CN115288816B CN115288816B CN202210968785.6A CN202210968785A CN115288816B CN 115288816 B CN115288816 B CN 115288816B CN 202210968785 A CN202210968785 A CN 202210968785A CN 115288816 B CN115288816 B CN 115288816B
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- gas
- water heat
- air
- water
- 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.)
- Active
Links
- 239000002918 waste heat Substances 0.000 title claims abstract description 37
- 238000011084 recovery Methods 0.000 title claims abstract description 24
- 238000005457 optimization Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 156
- 239000007789 gas Substances 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000000112 cooling gas Substances 0.000 claims description 7
- 239000000284 extract Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012802 pre-warming Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012536 storage buffer Substances 0.000 description 1
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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- 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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a starting optimization system for multi-stage recovery of island waste heat of a combined cycle, which comprises a gas turbine and a boiler and is characterized in that high-temperature compressed cooling air extracted from an outlet of the gas compressor is connected with a first gas-water heat exchanger, an outlet of the first gas-water heat exchanger is connected with a cooling cavity inlet of the gas turbine, the cooling cavity is connected with a first three-stage stationary blade, an outlet of the cavity is connected with a second gas-water heat exchanger, the first three stages are connected with a third gas-water heat exchanger through a pipeline, a steam Roots blower is arranged on the third gas-water heat exchanger, a high-pressure cylinder and a medium-pressure cylinder are connected in parallel with an outlet of the third gas-water heat exchanger, a first steam turbine outer box is correspondingly arranged in the high-pressure cylinder, a second steam turbine outer box is correspondingly arranged in the medium-pressure cylinder, a pre-channel and a rotor are correspondingly arranged in the first steam turbine outer box, and the boiler is communicated with the first gas-water heat exchanger, the second gas-water heat exchanger and the third gas-water heat exchanger through a high-pressure circulating water pump outlet.
Description
Technical Field
The invention relates to the technical field of power plant waste heat utilization, in particular to a starting optimization system and method for multi-stage recovery of island waste heat by combined cycle.
Background
The gas-steam combined cycle is used as power generation equipment for heating steam-water working medium by using exhaust gas of a gas turbine, and a large amount of waste heat on the side of a waste heat boiler (namely, a boiler island) is recycled, but under the current peak-shaving operation condition of high-power combined cycle in China, partial heat generated on the side of the gas turbine (namely, the engine island) is always wasted because of quick start of the gas turbine and lag of a waste heat boiler in the starting process.
At present, the initial temperature of the gas of the combined Cycle of the H-level/J-level heavy gas turbine is far beyond the bearing limit of the metal materials of turbine blades, the cooling system of the gas turbine generally pumps compressed air from the outlet of the gas compressor to enter a turbine cooling air heat exchanger, namely an OTC (Organic Trans-critical Cycle) heat exchanger, and the compressed air is further cooled and then sent to the turbine to be used as cooling air, so that the maximum temperature of the turbine blades is reduced by about 200 ℃.
The OTC heat exchanger generally extracts high-pressure low-temperature hot water in front of the high-pressure economizer, leads to a cooling air compressor of an island to exhaust air, then compressed air flows into a front three-stage stationary blade cavity, and the cooling air cools a turbine front three-stage blade through a series of cavities and air doors and is discharged out of the machine body from a fixed part of a main flow channel. The OTC heat exchanger generates high-pressure hot water or steam, the high-pressure hot water or steam is sent to a high-pressure steam drum during normal load of the combined cycle, the waste heat boiler is used for controlling the temperature rising rate during starting, the steam flow of the steam turbine is small, the high-pressure hot water generated by the OTC system is directly discharged to the condenser, after the gas turbine is started to a primary load stage, the temperature rising and pressure rising state of the boiler is up to 80 minutes under the condition of cold starting, and the water returning of the OTC system causes great loss of heat and pressure rising pump power.
At present, if the OTC system can be utilized to recycle heat energy of the island side of the machine to heat the island to start pre-warmed air, the heat energy of the heating device for pre-warming the external box of the steam turbine comes from an air heater, and the heat energy of the island side of the machine can be reasonably utilized in a high-pressure medium-pressure cylinder heat preservation CHS (namely Casings Heating System) system of the steam turbine to reduce the temperature difference between a rotor and a box body, so that the energy conservation and the economy of a starting process of a combined cycle power plant can be improved.
The existing related technology at the present stage is to store the residual heat of the gas turbine in a heat storage buffer device in the starting process and at low load, but the modification of a gas circuit structure is unavoidable, and high-cost heat storage equipment is introduced.
Therefore, aiming at a heavy gas turbine power plant, a technical scheme which combines the advantages of the existing water circulation system, has high efficiency, low cost and easy operation and can quantitatively recycle the heat waste heat of the side of the fuel machine is needed.
Disclosure of Invention
The invention aims to provide a starting optimization system for recovering waste heat of an island by combining circulation and multiple stages, so as to overcome the defects in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: the starting optimization system for the waste heat of the combined cycle multistage recovery island comprises a gas turbine and a boiler and is characterized in that an outlet of the gas compressor is connected with a combustion chamber and a first gas-water heat exchanger in parallel, a gas turbine with a built-in cavity is connected with an outlet of the combustion chamber and the first gas-water heat exchanger in parallel, the cavity comprises a gas film hole, a gas channel inlet guide pipe orifice and a gas channel outlet guide pipe, front three stages of stationary blades are arranged in the cavity at intervals, a cooling gas flow channel is formed, the cooling gas inlet guide pipe and the gas channel outlet guide pipe are arranged on the same side, and the gas channel outlet guide pipe is communicated with the second gas-water heat exchanger; the second air-water heat exchanger is connected with the third air-water heat exchanger through a pipeline, a steam-driven Roots blower is arranged on the third air-water heat exchanger, and the steam-driven Roots blower is driven by the steam extraction of the low-pressure cylinder 1 to operate, so that air can be pressurized and then drained; the third outlet of the air-water heat exchanger is connected with a high-pressure cylinder and a medium-pressure cylinder in parallel, a first steam turbine outer box is correspondingly arranged in the high-pressure cylinder, a second steam turbine outer box is correspondingly arranged in the medium-pressure cylinder, a cylinder and a rotor are correspondingly arranged in the first steam turbine outer box and the second steam turbine outer box, and the boiler is communicated with the first air-water heat exchanger, the second air-water heat exchanger and the third air-water heat exchanger through a circulating water pump.
As an improvement of the starting optimization system for the waste heat of the combined cycle multistage recovery machine island, a flow valve is arranged at the outlet of the air-water heat exchanger III and used for adjusting the air flow of the air-water heat exchanger III input high-pressure cylinder box body and the medium-pressure cylinder box body.
The invention aims to provide a starting optimization method for multi-stage recovery of waste heat of a machine island by combined cycle so as to overcome the defects in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: a start-up optimization method for waste heat of a combined cycle multistage recovery machine island is based on a start-up optimization system for waste heat of a combined cycle multistage recovery machine island, and comprises the following steps,
step 1, a cooling system extracts high-temperature compressed air from a compressor, the high-temperature compressed air flows to a combustion chamber and a first gas-water heat exchanger, the high-temperature compressed air flowing to the first gas-water heat exchanger heats high-pressure water supply flowing from a boiler to the first gas-water heat exchanger, and the heated water supply flows to the second gas-water heat exchanger and the third gas-water heat exchanger at a time;
step 2, high-temperature compressed air flowing out of the combustion chamber and the first air-water heat exchanger flows to blades of the front three-stage stationary blades in the cavity, the high-temperature compressed air flowing out of the cavity is heated by the front three-stage stationary blades, the high-temperature compressed air is respectively guided into the first air-water heat exchanger and the second air-water heat exchanger through a guide pipe of the cavity, and the high-temperature compressed air flowing to the second air-water heat exchanger heats water flowing through the second air-water heat exchanger;
and 3, the feed water in the step 2 flows to the air-water heat exchanger III through a pipeline, the feed water heats air which is fed into the air-water heat exchanger III through a pneumatic Roots blower, and the air is fed into the high-pressure cylinder outer box I and the medium-pressure cylinder outer box II of the steam turbine after being heated so as to reduce the temperature difference between the steam turbine outer box I and the outer box II and the rotor inside the steam turbine outer box II.
As an improvement of the starting optimization method of the combined cycle multistage recovery island waste heat, in the step 1, high-pressure compressed air heats high-pressure water fed from a boiler to a first gas-water heat exchanger to 300 ℃, and under the working conditions of a gas turbine starting initial load stage, a turbine sliding pressure operation and 100% of water feed flow, the OTC water feed flow can reach 100 tons/hour.
As an improvement of the starting optimization method of the combined cycle multistage recovery island waste heat, in the step 2, the high-temperature compressed air flowing to the second gas-water heat exchanger heats the water flowing through the second gas-water heat exchanger by 400 ℃.
In the step 2, a part of cooling compressed air flows into the chamber from the cooling air inlet and flows out of the air film hole, and the rest of cooling compressed air flows into the guide pipe from the air path outlet, and the guide pipe sends the high-temperature air with a certain pressure after being cooled by the blades into the second air-water heat exchanger to recover the waste heat.
As an improvement of the starting optimization method for the waste heat of the combined cycle multistage recovery island, in the step 3, the water supply continuously heats the air sucked by the steam Roots blower into the air-water heat exchanger III to 100-380 ℃, the heating flow is regulated according to the preheating requirement of the steam turbine, and the water supply of the air-water heat exchanger III finally returns to the condenser in the starting process of the combined cycle unit.
The specification of the pneumatic Roots blower is as follows: capacity of 25Nm 3 And/min, raising the pressure of the sucked air to 0.8MPa, and leading the pipeline into a third heat exchanger for heating. Compared with the prior art, the invention has the beneficial effects that:
1. in the initial load starting process of the combined cycle unit gas turbine, the characteristic that high-temperature and high-pressure hot water generated by the OTC heat exchanger does not return to the waste heat boiler to continuously do work is utilized, the two-stage heat exchanger is added under the condition of keeping the original water circulation system, the waste heat of the engine island is ingeniously recycled, and the heating of the air of the steam turbine of the heating furnace island can be started during the auxiliary steam heating pipe of the waste heat boiler.
2. The heat exchange efficiency of the gas-water heat exchanger is higher than that of the gas-gas heat exchanger, the system provided by the invention reasonably utilizes the high-temperature and high-pressure compressed air which is released to the outside by the cooling system for a long time in the starting process of the unit, and the TCA system which is originally discharged into the condenser in the starting process is heated again to recover the heat energy of the high-temperature and high-pressure hot water in a grading manner, so that the original air storage tank for providing the preheating of the steam turbine is replaced, the auxiliary heating equipment for heating the warm air of the outer box of the steam turbine is saved, the operation flexibility of the unit is improved, and the starting time is shortened;
3. under the condition that the air cooling effect of turbine blades is not affected, the system provided by the invention is based on the existing island-furnace island heat exchange water circulation pipeline of the combined cycle cooling system, and only two cascade heat recovery heat exchangers and induced draft fans (self-contained in a power plant) are added, so that the cost is low, the installation can be rapidly completed during the maintenance of the power plant, and the compressor and turbine related pipelines can be inspected and replaced without opening cylinders.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural diagram of the chamber in fig. 1:
fig. 3 is a schematic view of the structure of the gas-water heat exchanger.
Wherein the solid arrows in fig. 1 and 3 represent the flow direction of the feedwater and the short dashed arrows represent the flow direction of the cooling air.
Reference numerals
1. A compressor; 2. a combustion chamber; 3. a gas turbine; 4. a chamber; 5. a boiler; 6. the first high-pressure cylinder outer box is arranged in the first high-pressure cylinder outer box; 7. an outer box II of the medium pressure cylinder; 8. a high-pressure cylinder; 9. a medium pressure cylinder; 10. a first gas-water heat exchanger; 11. a second gas-water heat exchanger; 12. a pipe; 13. a gas-water heat exchanger III; 14. a pneumatic Roots blower; 15. a flow valve; 16. a low pressure cylinder; 17. a gas film hole; 18. an air channel inlet honeycomb duct; 19. an air path outlet honeycomb duct; 20. and a circulation pump.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, a starting optimization system for multi-stage recovery of island waste heat of combined cycle comprises a gas compressor 1 and a boiler 5, wherein an outlet of the gas compressor 1 is connected with a combustion chamber 2 and a first gas-water heat exchanger 10 in parallel, an outlet of the combustion chamber 2 and the first gas-water heat exchanger 10 is connected with a gas turbine 3 internally provided with a chamber 4 in parallel, a front three-stage stationary blade is arranged in the chamber 4, an inlet of the chamber 4 is connected with an outlet of the combustion chamber 2 and the first gas-water heat exchanger 10, an outlet of the chamber 4 is connected with a second gas-water heat exchanger 11, the second gas-water heat exchanger 11 is connected with a third gas-water heat exchanger 13 through a pipeline 12, a pneumatic Roots blower 14 is arranged at an air inlet of the third gas-water heat exchanger 13, an outlet of the third gas-water heat exchanger 13 is connected with a high-pressure cylinder 8 and a medium-pressure cylinder 9 in parallel, a first turbine outer box is correspondingly arranged in the high-pressure cylinder 8, a second turbine outer box is correspondingly provided with a cylinder and a rotor in the second turbine outer box, and the boiler 5 is communicated with the first gas-water heat exchanger 10, the second gas-water heat exchanger 11 and the third gas-water heat exchanger 13 through a circulating water pump.
A flow valve 15 is arranged at the outlet of the third air-water heat exchanger 13, and the flow valve 15 is used for adjusting the air flow rate of the third air-water heat exchanger 13 input into the high-pressure cylinder 8 and the medium-pressure cylinder 9.
As shown in fig. 2, the chamber 4 comprises a gas film hole 17, a gas channel inlet guide pipe orifice 18 and a gas channel outlet guide pipe 19, the front three stages of stationary blades are arranged in the chamber at intervals and form a cooling gas flow channel, the cooling gas inlet guide pipe 18 and the gas channel outlet guide pipe 19 are arranged on the same side, and the gas channel outlet guide pipe 19 is communicated with the second gas-water heat exchanger 11.
The pneumatic Roots blower 14 is driven by the steam extraction of the low-pressure cylinder 16 to run, and can pressurize and then drain the air.
A start-up optimization method for waste heat of a combined cycle multistage recovery machine island is based on a start-up optimization system for waste heat of a combined cycle multistage recovery machine island, and comprises the following steps,
in step 1, the cooling system extracts high-temperature compressed air from the compressor 1, the high-temperature compressed air flows to the combustion chamber 2 and the first air-water heat exchanger 10 respectively, the high-temperature compressed air flowing to the first air-water heat exchanger 10 heats high-pressure feed water flowing to the first air-water heat exchanger 10 from the boiler 5, the high-temperature compressed air heats the high-pressure feed water flowing to the first air-water heat exchanger 10 from the boiler 5 to 300 ℃, and the heated feed water flows to the second air-water heat exchanger 11 and the third air-water heat exchanger 13 at a time. The OTC water supply flow rate can reach 100 tons/hour under the working conditions of the gas turbine in the initial load starting stage, the sliding pressure operation of the turbine and the water supply flow rate of 100 percent.
Step 2, high-temperature compressed air flowing out of the combustion chamber 2 and the first air-water heat exchanger 10 flows to blades of the front three-stage stationary blades in the chamber 4, the high-temperature compressed air flowing out of the chamber 4 is heated by the front three-stage stationary blades, the high-temperature compressed air is respectively guided into the first air-water heat exchanger 10 and the second air-water heat exchanger 11 through a guide pipe 19 of the chamber 4, the high-temperature compressed air flowing to the second air-water heat exchanger 11 heats the feed water flowing through the second air-water heat exchanger 11, and the high-temperature compressed air flowing to the second air-water heat exchanger 11 heats the feed water flowing through the second air-water heat exchanger 11 to 400 ℃; part of the cooling compressed air flows into the chamber 4 from the cooling air inlet 16 and flows out of the air film hole 17, the rest of the cooling compressed air flows into the guide pipe 19 from the air path outlet 18, and the guide pipe 19 fills the high-pressure high-temperature air cooled by the blades into the second air-water heat exchanger 11 to recover waste heat.
In step 3, the feed water in step 2 flows to the third air-water heat exchanger 13 through the pipeline 12, the feed water heats the air which is introduced into the third air-water heat exchanger 13 through the pneumatic Roots blower 14 to 100-380 ℃, and the air is sent into the first outer box of the high-pressure cylinder 8 and the second outer box of the medium-pressure cylinder 9 of the steam turbine after being heated so as to reduce the temperature difference between the first outer box and the second outer box of the steam turbine and the rotor inside the first outer box and the second outer box of the steam turbine.
The warm air entering the outer box should be as close to the steam temperature in the starting process of the steam turbine as possible to play a pre-heating effect, the pre-heating can reduce the temperature difference between the steam turbine cylinder and the rotor inside the steam turbine cylinder, the heat dissipation loss and the heat exchanger efficiency of the pipeline 12 are considered, the requirement can be completely met by utilizing the recovered waste heat to heat the return water of the OTC system to the temperature required by the pre-heating, and finally the steam turbine is driven by the steam of the waste heat boiler 5 to run at a rising speed. As shown in fig. 3, the broken line represents air, the solid line represents water or steam, fin-type air-water heat exchangers are selected as an air-water heat exchanger one 10, an air-water heat exchanger two 11 and an air-water heat exchanger three 13 respectively, high-pressure water boosted by a circulating water pump flows in a pipeline 12, the pressure loss is small, compressed air entering the heat exchangers tangentially flows through the fins in the pipeline, and certain pressure loss is achieved but the fluidity is not affected, so that an additional water pump or an air pump is not needed in the system.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The starting optimization system for the waste heat of the combined cycle multistage recovery island comprises a gas turbine and a boiler and is characterized in that an outlet of the gas compressor is connected with a combustion chamber and a first gas-water heat exchanger in parallel, a gas turbine with a built-in cavity is connected with an outlet of the combustion chamber and the first gas-water heat exchanger in parallel, the cavity comprises a gas film hole, a gas channel inlet guide pipe orifice and a gas channel outlet guide pipe, front three stages of stationary blades are arranged in the cavity at intervals, a cooling gas flow channel is formed, the cooling gas inlet guide pipe and the gas channel outlet guide pipe are arranged on the same side, and the gas channel outlet guide pipe is communicated with the second gas-water heat exchanger; the second air-water heat exchanger is connected with the third air-water heat exchanger through a pipeline, a steam-driven Roots blower is arranged on the third air-water heat exchanger, and the steam-driven Roots blower is driven by the steam extraction of the low-pressure cylinder to operate, so that air can be pressurized and then drained; the third outlet of the air-water heat exchanger is connected with a high-pressure cylinder and a medium-pressure cylinder in parallel, a first steam turbine outer box is correspondingly arranged in the high-pressure cylinder, a second steam turbine outer box is correspondingly arranged in the medium-pressure cylinder, a cylinder and a rotor are correspondingly arranged in the first steam turbine outer box and the second steam turbine outer box, and the boiler is communicated with the first air-water heat exchanger, the second air-water heat exchanger and the third air-water heat exchanger through a circulating water pump.
2. The start-up optimization system for the combined cycle multistage recovery island waste heat according to claim 1, wherein a flow valve is arranged at the outlet of the gas-water heat exchanger III and is used for adjusting the air flow rate of the gas-water heat exchanger III input high-pressure cylinder box body and the medium-pressure cylinder box body.
3. A start-up optimization method for waste heat of a combined cycle multistage recovery machine island based on the start-up optimization system for waste heat of a combined cycle multistage recovery machine island according to claim 1, comprising the steps of,
step 1, a cooling system extracts high-temperature compressed air from a compressor, the high-temperature compressed air flows to a combustion chamber and a first gas-water heat exchanger, the high-temperature compressed air flowing to the first gas-water heat exchanger heats high-pressure water supply flowing from a boiler to the first gas-water heat exchanger, and the heated water supply flows to the second gas-water heat exchanger and the third gas-water heat exchanger at a time;
step 2, high-temperature compressed air flowing out of the combustion chamber and the first air-water heat exchanger flows to blades of the front three-stage stationary blades in the cavity, the high-temperature compressed air flowing out of the cavity is heated by the front three-stage stationary blades, the high-temperature compressed air is respectively guided into the first air-water heat exchanger and the second air-water heat exchanger through a guide pipe of the cavity, and the high-temperature compressed air flowing to the second air-water heat exchanger heats water flowing through the second air-water heat exchanger;
and 3, the feed water in the step 2 flows to the air-water heat exchanger III through a pipeline, the feed water heats air which is fed into the air-water heat exchanger III through a pneumatic Roots blower, and the air is fed into the high-pressure cylinder outer box I and the medium-pressure cylinder outer box II of the steam turbine after being heated so as to reduce the temperature difference between the steam turbine outer box I and the outer box II and the rotor inside the steam turbine outer box II.
4. A start-up optimization method for combined cycle multistage recovery island waste heat according to claim 3, wherein in step 1, high temperature compressed air heats high pressure feedwater flowing from the boiler to the first gas-water heat exchanger to 300 ℃, and OTC feedwater flow can reach 100 tons/hour under the conditions of gas turbine start-up primary load phase, turbine sliding pressure operation, and feedwater flow of 100%.
5. A start-up optimization method for combined cycle multi-stage recovery island waste heat according to claim 3, wherein in step 2, the high temperature compressed air flowing to the second gas-water heat exchanger heats the feed water flowing through the second gas-water heat exchanger by 400 ℃.
6. A start-up optimization method for combined cycle multistage recovery island waste heat according to claim 3, wherein in step 2, a part of cooling compressed air flows into the chamber from the cooling gas inlet and flows out of the film hole, and the remaining cooling compressed air flows into the draft tube from the gas path outlet, and the draft tube sends the high-temperature air with a certain pressure after cooling the blades into the second gas-water heat exchanger to recover the waste heat.
7. The method for starting and optimizing the waste heat of the combined cycle multistage recovery machine island according to claim 3, wherein in the step 3, the water supply continuously heats the air sucked by the pneumatic Roots blower into the air-water heat exchanger III to 100-380 ℃, the warm air flow is adjusted according to the pre-heating requirement of the steam turbine, and the water supply of the air-water heat exchanger III finally returns to the condenser in the starting process of the combined cycle unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968785.6A CN115288816B (en) | 2022-08-12 | 2022-08-12 | Starting optimization system and method for combined cycle multistage recovery machine island waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968785.6A CN115288816B (en) | 2022-08-12 | 2022-08-12 | Starting optimization system and method for combined cycle multistage recovery machine island waste heat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115288816A CN115288816A (en) | 2022-11-04 |
| CN115288816B true CN115288816B (en) | 2023-09-29 |
Family
ID=83829154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210968785.6A Active CN115288816B (en) | 2022-08-12 | 2022-08-12 | Starting optimization system and method for combined cycle multistage recovery machine island waste heat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115288816B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437835A (en) * | 2013-08-29 | 2013-12-11 | 中国神华能源股份有限公司 | Device and method for conducting high pressure cylinder warming on gas-steam combined cycle unit |
| CN206738005U (en) * | 2017-04-28 | 2017-12-12 | 沁水晋煤瓦斯发电有限公司 | A kind of gas electricity system |
| CN208918610U (en) * | 2018-07-18 | 2019-05-31 | 华北电力大学 | Supercritical CO 2 and coal fired power plant decarburization integrate and the electricity generation system of UTILIZATION OF VESIDUAL HEAT IN |
| CN214836585U (en) * | 2021-03-16 | 2021-11-23 | 华能北京热电有限责任公司 | Two-driving-one gas-steam combined cycle unit adopting open-loop control split type valve |
| CN113692479A (en) * | 2019-04-23 | 2021-11-23 | 三菱动力株式会社 | Steam turbine plant and method of operation and combined cycle plant and method of operation |
| CN113958413A (en) * | 2021-11-15 | 2022-01-21 | 西安热工研究院有限公司 | Gas-steam combined cycle intake fuel coupling heating system and method |
| CN114687805A (en) * | 2020-12-30 | 2022-07-01 | 华能北京热电有限责任公司 | Turbine cooling and natural gas heating integrated gas turbine system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100205967A1 (en) * | 2009-02-16 | 2010-08-19 | General Electric Company | Pre-heating gas turbine inlet air using an external fired heater and reducing overboard bleed in low-btu applications |
| RS62734B1 (en) * | 2018-06-08 | 2022-01-31 | Stankovic Branko | Gas-turbine power-plant with pneumatic motor with isobaric internal combustion |
-
2022
- 2022-08-12 CN CN202210968785.6A patent/CN115288816B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437835A (en) * | 2013-08-29 | 2013-12-11 | 中国神华能源股份有限公司 | Device and method for conducting high pressure cylinder warming on gas-steam combined cycle unit |
| CN206738005U (en) * | 2017-04-28 | 2017-12-12 | 沁水晋煤瓦斯发电有限公司 | A kind of gas electricity system |
| CN208918610U (en) * | 2018-07-18 | 2019-05-31 | 华北电力大学 | Supercritical CO 2 and coal fired power plant decarburization integrate and the electricity generation system of UTILIZATION OF VESIDUAL HEAT IN |
| CN113692479A (en) * | 2019-04-23 | 2021-11-23 | 三菱动力株式会社 | Steam turbine plant and method of operation and combined cycle plant and method of operation |
| CN114687805A (en) * | 2020-12-30 | 2022-07-01 | 华能北京热电有限责任公司 | Turbine cooling and natural gas heating integrated gas turbine system |
| CN214836585U (en) * | 2021-03-16 | 2021-11-23 | 华能北京热电有限责任公司 | Two-driving-one gas-steam combined cycle unit adopting open-loop control split type valve |
| CN113958413A (en) * | 2021-11-15 | 2022-01-21 | 西安热工研究院有限公司 | Gas-steam combined cycle intake fuel coupling heating system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115288816A (en) | 2022-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110454769B (en) | Control system and control method for high-backpressure steam-driven feed pump of large generator set | |
| CN104879177A (en) | Organic Rankin cycle and heat pump cycle coupling system | |
| CN107687663B (en) | Multi-type heat pump combined type exhaust steam recovery heat supply system and heat supply method | |
| JP2010174755A (en) | Power plant | |
| CN108443939B (en) | Exhaust steam waste heat recovery heating system suitable for water-cooling steam turbine unit | |
| CN111577409B (en) | Recovery system for recovering exhaust steam of steam turbine by adopting cascade utilization and supercharging upgrading technology | |
| CN115288816B (en) | Starting optimization system and method for combined cycle multistage recovery machine island waste heat | |
| CN109763869B (en) | Heat accumulation coupling steam extraction integrated system for cascade utilization of combined cycle energy and operation method thereof | |
| CN112576375B (en) | System and method for utilizing cold and heat quantity between coal presses of low-heat-value combined cycle unit | |
| US3289402A (en) | Thermal power installation | |
| CN213980964U (en) | Cold and heat quantity optimal utilization system between coal press of low-heat-value combined cycle unit | |
| CN114483231B (en) | Compressed air energy storage system and control method thereof | |
| CN113323735B (en) | Parallel operation waste incineration power generation thermodynamic system | |
| CN212535795U (en) | Heat supply and power generation cogeneration system for recycling exhausted steam of steam turbine | |
| CN109751651B (en) | Double back pressure and heat pump combined heat supply system of 300MW and above grade air cooling unit | |
| CN113899006A (en) | Heating system for driving heat pump to recover circulating water waste heat by utilizing low-pressure heater and drainage water | |
| CN111691934A (en) | Heat supply and power generation cogeneration system for recycling exhausted steam of steam turbine | |
| CN112432219A (en) | Double-cold-source efficient heating system suitable for large four-exhaust steam turbine unit | |
| CN110953069A (en) | Multi-energy coupling power generation system of gas turbine power station | |
| CN212359875U (en) | Steam turbine system with air cooling | |
| CN112228174B (en) | Thermoelectric decoupling system and method for heating by combining low-back-pressure cutting cylinder with steam ejector | |
| CN209990515U (en) | Low-grade heat recovery system of steam turbine | |
| CN216077238U (en) | Energy-saving steam turbine power generation device | |
| CN216240846U (en) | Differential pressure cold energy comprehensive utilization device of gas power plant | |
| CN114754395B (en) | Heating system based on four-stage back pressure cascade heating and adjusting 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |