CN214406013U - Novel tail waste heat cascade comprehensive utilization system of H-level gas turbine waste heat boiler - Google Patents
Novel tail waste heat cascade comprehensive utilization system of H-level gas turbine waste heat boiler Download PDFInfo
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- CN214406013U CN214406013U CN202022792125.6U CN202022792125U CN214406013U CN 214406013 U CN214406013 U CN 214406013U CN 202022792125 U CN202022792125 U CN 202022792125U CN 214406013 U CN214406013 U CN 214406013U
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- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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Abstract
The utility model discloses a novel cascade comprehensive utilization system for tail waste heat of a waste heat boiler of an H-level gas turbine, which comprises a hot water heater arranged at the tail of the waste heat boiler, and a hot water circulating pump arranged on a water outlet pipeline of the hot water heater, wherein the water outlet pipeline of the hot water heater is communicated with a water return pipeline; after being heated by a hot water heater, water flow is boosted by a hot water circulating pump and then respectively sent to heat exchange equipment for heat exchange, and each path of hot water after heat exchange returns to a water return pipeline of the hot water heater again to enter the hot water heater for heating; adjacent coal machine condensate heating system includes: the system comprises a condensation water heater arranged in the tail part of the waste heat boiler of the H-level gas turbine and a condensation water circulating pump arranged on an inlet pipeline of the condensation water heater; the hot water heater and the condensed water heater are sequentially arranged along the flow direction of the flue gas in the waste heat boiler; the condensed water is pressurized by the condensed water circulating pump, enters the condensed water heater for heating and then flows out.
Description
Technical Field
The utility model relates to a novel H level gas turbine exhaust-heat boiler afterbody waste heat step comprehensive utilization system belongs to H level gas turbine combined cycle generating set technical field.
Background
The power plant project is a special industry with huge energy consumption and energy output, and from a macroscopic view, the H-level gas turbine combined cycle power generation project is an energy-saving project for recovering exhaust waste heat of the H-level gas turbine to generate power. A waste heat boiler in an H-stage gas turbine combined cycle generator set is heat exchange equipment for recovering exhaust waste heat of a gas turbine to generate steam required by driving the steam turbine to generate electricity. The waste heat boiler is an important device in the combined cycle power plant equipment, so that the improvement of the heat efficiency of the waste heat boiler has important significance for improving the efficiency of the whole combined cycle power plant.
Compared with the traditional boiler of a coal-fired unit, the waste heat boiler heat exchange equipment of the gas turbine combined cycle generator set is not provided with the air preheater, the function of the air preheater is to improve the temperature of the hearth and the combustion efficiency, and also to adjust the exhaust gas temperature of the boiler, so that the boiler has higher feed water temperature and lower exhaust gas temperature. The air preheater is an indispensable part for obtaining higher efficiency of a conventional boiler and the heat efficiency of the working medium circulation of a boiler and steam turbine system. In consideration of the fact that an air preheater is lacked in the waste heat boiler to adjust the overall heat exchange performance inside the boiler, the prior art scheme adopts a mode of expanding an economizer and adding a hot water heater, the design cost of the waste heat boiler is increased by adopting the mode of the expanding economizer, and meanwhile, the design work difficulty of the distribution of the heating surface of the waste heat boiler, the temperature difference of a node, the temperature difference of an approach point and the pressure loss of the side gas pressure is greatly increased; the mode that the existing patent CN205744156U only adopts the additional hot water heater to heat the natural gas can not fully absorb the waste heat at the tail of the boiler, and a certain amount of waste heat is still wasted when the waste heat boiler operates.
SUMMERY OF THE UTILITY MODEL
For solving prior art's not enough, the utility model aims to provide a novel H level gas turbine exhaust-heat boiler afterbody waste heat step comprehensive utilization system, solved current exhaust-heat boiler afterbody waste heat utilization not enough and cause the extravagant problem of energy.
In order to achieve the above object, the utility model adopts the following technical scheme: a novel cascade comprehensive utilization system for tail waste heat of a waste heat boiler of an H-level gas turbine comprises a hot water heating comprehensive utilization system and a condensed water heating system of an adjacent coal machine,
the hot water heating comprehensive utilization system comprises: the hot water heater is arranged in the tail part of the H-level gas turbine waste heat boiler, a water outlet pipeline and a water return pipeline of the hot water heater, and a hot water circulating pump is arranged on the water outlet pipeline of the hot water heater, and the water outlet pipeline and the water return pipeline of the hot water heater are communicated; after being heated by a hot water heater, water flow is boosted by a hot water circulating pump and then respectively sent to heat exchange equipment for heat exchange, and each path of hot water after heat exchange returns to a water return pipeline of the hot water heater again to enter the hot water heater for heating;
the adjacent coal machine condensate heating system comprises: the system comprises a condensation water heater arranged in the tail part of the waste heat boiler of the H-level gas turbine and a condensation water circulating pump arranged on an inlet pipeline of the condensation water heater; the hot water heater and the condensed water heater are sequentially arranged along the flow direction of the flue gas in the waste heat boiler; the condensed water is pressurized by the condensed water circulating pump, enters the condensed water heater for heating and then flows out.
Furthermore, the hot water circulating pumps comprise three, are arranged on the water outlet pipeline of the hot water heater in parallel and are used for pressurizing hot water.
Further, the heat exchange equipment comprises: the system comprises a natural gas heating system, a heating and ventilation energy station, a chemical raw water system and a gas turbine inlet air cooling and refrigerating system.
Further, the natural gas heating system includes: the natural gas heating device comprises a natural gas heater, a hot water pipeline and a natural gas pipeline, wherein the hot water pipeline and the natural gas pipeline are communicated in the middle of the natural gas heater, part of hot water flowing out of a hot water circulating pump heats natural gas in the natural gas heater through the hot water pipeline and then flows back to the water return pipeline again, an inlet of the natural gas pipeline is connected with a natural gas separation filtering unit, and an outlet of the heated natural gas passing through the natural gas pipeline is connected with a natural gas pressure regulating unit.
Furthermore, a condensed water circulating pump inlet shutoff valve is arranged at an inlet of the condensed water circulating pump, and a condensed water heater outlet is provided with a condensed water outlet shutoff valve.
Furthermore, the condensed water at the inlet of the condensed water heater comes from part of condensed water led out from a shaft seal heater of a coal-fired unit in the same power plant, and the outlet of the condensed water heater is connected with a condensed water pipeline at the outlet of a final-stage low-pressure heater of the coal-fired unit after passing through a condensed water outlet shutoff valve.
Further, the adjacent coal machine condensate heating system further comprises: the recycling pipeline is arranged between the outlet of the condensed water heater and the inlet pipeline and connected with the condensed water recycling pump, and the condensed water recycling pump is connected with the inlet pipeline of the condensed water heater.
The utility model discloses the beneficial effect who reaches:
(1) the tail part of the waste heat boiler is additionally provided with the hot water heater and the condensed water heater, so that the heat of the flue gas is fully absorbed, the flue gas is reduced as far as possible on the premise of avoiding low-temperature corrosion of a heating surface, and the maximum utilization of the tail part of the waste heat boiler flue gas waste heat is realized;
(2) the hot water heater is additionally arranged to generate hot water, and the hot water is used for replacing the original auxiliary steam for a natural gas heating system, a heating and ventilation energy station, a chemical raw water system and a gas turbine inlet air cooling and refrigerating system, so that the exhaust gas temperature of a waste heat boiler can be reduced, the auxiliary steam consumption of a unit can be reduced, the output of a steam turbine is improved, and the cascade comprehensive utilization of the whole plant efficiency is improved;
(3) the condensation water heater is additionally arranged to heat the condensation water led out by the coal-fired unit, the flow of the condensation water flowing through the final-stage low-pressure heater is reduced, the consumption of the steam extracted by low-heating and back-heating corresponding to the final stage is reduced according to the self-balancing characteristic of the heater, the flow of the steam entering the low-pressure cylinder for expansion and work is increased, the output level of the unit is improved, and the operating efficiency and the economy of the coal-fired unit are further improved;
(4) the cascade comprehensive utilization system for the tail waste heat of the H-level gas turbine waste heat boiler disclosed by the invention is optimized for various power plants with domestic coal-fired units and gas turbine combined cycle units in the same site, is low in modification difficulty and modification cost, and has high popularization value and application prospect.
Drawings
Fig. 1 is a schematic view of a comprehensive utilization system according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The H-level gas turbine waste heat boiler tail waste heat step comprehensive utilization system is characterized in that a hot water heater 210 and a condensed water heater 220 are sequentially added along the smoke flow direction behind a low-pressure economizer at the tail of a waste heat boiler 100 of an H-level gas turbine combined cycle unit to form a hot water heating comprehensive utilization system and a condensed water heating system of an adjacent coal machine.
As shown in fig. 1, a novel cascade comprehensive utilization system for waste heat at the tail part of a waste heat boiler of an H-level gas turbine comprises a hot water heating comprehensive utilization system and a condensed water heating system of an adjacent coal machine;
the hot water heating comprehensive utilization system comprises: the hot water heater 210 is arranged in the tail part of the waste heat boiler 100 of the H-level combustion engine combined cycle unit, a water outlet pipeline and a water return pipeline of the hot water heater 210, and hot water circulating pumps (330, 340 and 350) are arranged on the water outlet pipeline of the hot water heater 210 in parallel, and the water outlet pipeline and the water return pipeline of the hot water heater 210 are communicated;
the hot water flows through the added hot water heater 210 for heating, is boosted by the hot water circulating pump and then is respectively sent to the natural gas heating system, the heating and ventilation energy station, the chemical raw water system and the gas turbine inlet air cooling and refrigerating system for heat exchange, and the four paths of hot water after heat exchange are returned to the water return pipelines of the hot water heater 210 again to enter the hot water heater of the waste heat boiler for heating, so that the water is recycled.
The natural gas heating system is used for heating natural gas through hot water;
the heating and ventilation energy station is used for providing heat for a plant water system through hot water and is an existing system;
the chemical raw water system is used for heating chemical desalted water through hot water and is an existing system;
the gas turbine inlet air cooling refrigeration system is used for providing a heat source for the lithium bromide refrigeration system through hot water, providing driving force for the lithium bromide refrigeration system and providing driving force for the existing system.
The natural gas heating system comprises a natural gas heater, a hot water pipeline and a natural gas pipeline, wherein the hot water pipeline and the natural gas pipeline are communicated in the middle of the natural gas heater, partial hot water flowing out of the hot water circulating pump heats natural gas in the natural gas heater through the hot water pipeline and then flows back to the water return pipeline again, the inlet of the natural gas pipeline is connected with a natural gas separation filtering unit, and the heated natural gas is connected with a natural gas pressure regulating unit through the outlet of the natural gas pipeline and is used by a follow-up module.
The hot water circulating pumps 330, 340 and 350 are arranged on the outlet pipelines of the hot water heater 210 to ensure that the hot water of the hot water heating gradient utilization system overcomes the pipeline resistance to form a closed circulating system, and the hot water circulating pumps 330, 340 and 350 are in a dual-purpose state and a standby state.
The hot water heater 210 absorbs the tail waste heat of the waste heat boiler 100 to generate hot water to replace the original auxiliary steam to serve as a heating working medium, on one hand, the exhaust gas temperature of the waste heat boiler is reduced through hot water heat exchange to achieve waste heat utilization, on the other hand, the using amount of the auxiliary steam of the unit can be reduced, and further the whole plant efficiency is improved.
Adjacent coal machine condensate heating system includes: the system comprises a condensed water heater 220, a condensed water circulating pump inlet shutoff valve 410, a condensed water circulating pump 310, a condensed water outlet shutoff valve 410 and a condensed water recycling pump 310 which are arranged inside the tail part of the waste heat boiler 100 of the H-level gas turbine combined cycle unit;
the hot water heater 210 and the condensed water heater 220 are sequentially arranged along the flow direction of the flue gas in the waste heat boiler 100;
part of condensed water led out by a shaft seal heater of a coal-fired unit in the same power plant is boosted by a condensed water circulating pump inlet shutoff valve 410 and a condensed water circulating pump 310 and then is connected with an inlet of a condensed water heater 220 additionally arranged at the tail part of a waste heat boiler of an H-grade gas turbine, an outlet of the condensed water heater 220 is connected with an outlet condensed water pipeline of a low-pressure heater at the last stage of the coal-fired unit after passing through the condensed water outlet shutoff valve 410, a recirculation pipeline is arranged between an outlet of the condensed water heater and an inlet pipeline and is connected with the condensed water recirculation pump 310, and the condensed water recirculation pump 310 is connected with the inlet pipeline of the condensed water heater 220.
The hot water heater 210 and the condensed water heater 220 are sequentially arranged behind the low-pressure economizer of the waste heat boiler for heat exchange, so that the cascade utilization of tail waste heat is realized, and the hot water heater is close to the low-pressure economizer side of the waste heat boiler.
By additionally arranging the condensed water heater 220 on the waste heat boiler, partial condensed water at the outlet of the shaft seal heater of the adjacent coal-fired unit is utilized to fully absorb the tail waste heat of the waste heat boiler 100, the defect of insufficient energy of a hot water heating cascade utilization system is overcome, the smoke discharge is reduced as far as possible on the premise of avoiding the low-temperature corrosion of a heating surface, and the maximum utilization of the tail smoke waste heat is realized. The condensed water at the outlet of the shaft seal heater of the original adjacent coal-fired unit directly enters the final-stage low-pressure heater of the coal-fired unit, so that a large amount of energy is consumed, and energy conservation and consumption reduction can be realized through the improvement of the invention.
The purpose of the shutoff valves 410 and 420 is to effectively avoid the potential safety hazard of the operation of the condensed water heating system of the adjacent coal machine when the condensed water heater 220 has an accident condition when the condensed water heater 220 has an accident.
The condensate water recirculation pump 310 is arranged on an outlet pipeline of the condensate water heater 220, and the purpose of arranging the condensate water recirculation pump 310 is to ensure that the inlet water temperature of the condensate water heater 220 is not lower than 52 ℃, improve the inlet water temperature, improve the heat exchange efficiency and effectively avoid low-temperature corrosion on the heating surface at the tail part of the waste heat boiler 100.
In the invention, condensed water from a coal-fired unit enters a condensed water heater 220 for heating after passing through a condensed water circulating pump inlet shutoff valve 410 and a condensed water circulating pump 320, and the condensed water heated by the condensed water heater 220 is divided into two paths, wherein one path is as follows: the condensed water is directly conveyed to a condensed water pipeline at the outlet of a final-stage heater of the coal-fired unit through a shutoff valve 420, and the other path is as follows: the condensate is re-delivered to the inlet of the condensate heater 220 by the condensate recirculation pump 310.
In order to fully utilize the flue gas waste heat, the invention provides a scheme that a hot water heater and a condensed water heater of an adjacent coal machine are sequentially arranged along the flue gas flow direction behind a low-pressure coal economizer at the tail part of a waste heat boiler, and the outlet temperature of a natural gas heater is 30 ℃. The energy saving benefit generated by the invention is calculated as follows:
the heat loads required by the natural gas heater, the heating and ventilation energy station, the chemical raw water system and the gas turbine inlet air cooling and refrigerating system are shown in table 1.
TABLE 1 thermal load of thermal equipment of heat recovery cascade comprehensive utilization system of waste heat boiler of certain H-level gas turbine under working conditions of different seasons
In the combustion-evaporation combined cycle without a hot water heater, the heat required by a natural gas heating system, a heating and ventilation energy station, a chemical raw water system and a combustion engine inlet air cooling and refrigerating system mainly comes from auxiliary steam, and the parameters of the auxiliary steam are generally 1.0MPa.a and 300 ℃. The added cost of using auxiliary steam to provide energy in the absence of a hot water heater is calculated below.
Table 2 shows the added cost of heating natural gas with auxiliary steam. Under the working condition of summer, the steam consumption is 4.49t/h, under the working condition of winter is 3.93t/h, if the auxiliary steam is calculated according to 150 yuan/ton, the cost is increased by 58.93 ten thousand yuan in summer, the cost is increased by 51.58 ten thousand yuan in winter, and the cost is increased by 110.51 ten thousand yuan all the year round.
TABLE 2 added cost with auxiliary steam heating
In conclusion, by adopting the scheme of the tail waste heat cascade comprehensive utilization system, the temperature of the exhaust gas can be reduced to 70 ℃, corresponding hot water can be supplied according to different load conditions of other equipment in the plant, heat is provided for the natural gas heater and the heating energy station, and the cost of the power plant can be saved by about 110.51 ten thousand yuan at least every year.
According to the invention, the hot water heater 210 and the condensed water heater 220 are sequentially added behind the low-pressure economizer at the tail part of the waste heat boiler 100 of the H-level gas turbine combined cycle unit along the smoke flow direction to form a hot water heating comprehensive utilization system and a condensed water heating system of an adjacent coal machine, so that the heat of smoke is fully absorbed, the smoke discharge is reduced as far as possible on the premise of ensuring avoidance of low-temperature corrosion of a heating surface, the maximum utilization of the tail smoke waste heat is realized, the running economy and efficiency of the unit are improved, and the benefit of a power plant is increased.
The hot water heating comprehensive utilization system is characterized in that hot water generated by heating through the hot water heater 210 is respectively conveyed to a natural gas heating system, a heating and ventilation energy station, a chemical raw water system and a combustion engine inlet air cooling refrigeration system through hot water circulating pumps 330, 340 and 350 which are connected in parallel. The hot water circulation pumps 330, 340 and 350 are arranged in the outlet pipes of the hot water heater 210 to ensure that the hot water of the hot water heating gradient utilization system overcomes the pipe resistance to form a closed circulation system.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (7)
1. A novel cascade comprehensive utilization system for tail waste heat of a waste heat boiler of an H-level gas turbine is characterized by comprising a hot water heating comprehensive utilization system and a condensed water heating system of an adjacent coal machine,
the hot water heating comprehensive utilization system comprises: the hot water heater is arranged in the tail part of the H-level gas turbine waste heat boiler, a water outlet pipeline and a water return pipeline of the hot water heater, and a hot water circulating pump is arranged on the water outlet pipeline of the hot water heater, and the water outlet pipeline and the water return pipeline of the hot water heater are communicated; after being heated by a hot water heater, water flow is boosted by a hot water circulating pump and then respectively sent to heat exchange equipment for heat exchange, and each path of hot water after heat exchange returns to a water return pipeline of the hot water heater again to enter the hot water heater for heating;
the adjacent coal machine condensate heating system comprises: the system comprises a condensation water heater arranged in the tail part of the waste heat boiler of the H-level gas turbine and a condensation water circulating pump arranged on an inlet pipeline of the condensation water heater; the hot water heater and the condensed water heater are sequentially arranged along the flow direction of the flue gas in the waste heat boiler; the condensed water is pressurized by the condensed water circulating pump, enters the condensed water heater for heating and then flows out.
2. The novel cascade comprehensive utilization system for the tail waste heat of the waste heat boiler of the H-level gas turbine as claimed in claim 1, wherein the number of the hot water circulating pumps is three, and the three hot water circulating pumps are arranged on a water outlet pipeline of the hot water heater in parallel and used for pressurizing hot water.
3. The novel cascade comprehensive utilization system for the tail waste heat of the waste heat boiler of the H-grade gas turbine as claimed in claim 1, wherein the heat exchange device comprises: the system comprises a natural gas heating system, a heating and ventilation energy station, a chemical raw water system and a gas turbine inlet air cooling and refrigerating system.
4. The novel cascade comprehensive utilization system for the tail waste heat of the waste heat boiler of the H-grade gas turbine as claimed in claim 3, wherein the natural gas heating system comprises: the natural gas heating device comprises a natural gas heater, a hot water pipeline and a natural gas pipeline, wherein the hot water pipeline and the natural gas pipeline are communicated in the middle of the natural gas heater, part of hot water flowing out of a hot water circulating pump heats natural gas in the natural gas heater through the hot water pipeline and then flows back to the water return pipeline again, an inlet of the natural gas pipeline is connected with a natural gas separation filtering unit, and an outlet of the heated natural gas passing through the natural gas pipeline is connected with a natural gas pressure regulating unit.
5. The novel stepped comprehensive utilization system for the tail waste heat of the waste heat boiler of the H-grade gas turbine as claimed in claim 1, wherein an inlet shutoff valve of the condensed water circulating pump is arranged at an inlet of the condensed water circulating pump, and an outlet shutoff valve of the condensed water heater is arranged at an outlet of the condensed water circulating pump.
6. The novel stepped comprehensive utilization system for the tail waste heat of the waste heat boiler of the H-grade gas turbine as claimed in claim 5, is characterized in that the condensed water at the inlet of the condensed water heater is part of the condensed water led out from the shaft seal heater of the coal-fired unit in the same power plant, and the outlet of the condensed water heater is connected with a condensed water pipeline at the outlet of the final-stage low-pressure heater of the coal-fired unit after passing through a condensed water outlet shutoff valve.
7. The novel tail waste heat cascade comprehensive utilization system of the waste heat boiler of the H-level gas turbine as claimed in claim 1, wherein the condensed water heating system of the adjacent coal machine further comprises: the recycling pipeline is arranged between the outlet of the condensed water heater and the inlet pipeline and connected with the condensed water recycling pump, and the condensed water recycling pump is connected with the inlet pipeline of the condensed water heater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022792125.6U CN214406013U (en) | 2020-11-27 | 2020-11-27 | Novel tail waste heat cascade comprehensive utilization system of H-level gas turbine waste heat boiler |
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| CN202022792125.6U CN214406013U (en) | 2020-11-27 | 2020-11-27 | Novel tail waste heat cascade comprehensive utilization system of H-level gas turbine waste heat boiler |
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