CN115929430A - Industrial heat supply steam turbine backheating system - Google Patents
Industrial heat supply steam turbine backheating system Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 230000001172 regenerating effect Effects 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 238000010248 power generation Methods 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims description 28
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Abstract
The invention relates to the technical field of a turbine regenerative system, in particular to an industrial heat supply turbine regenerative system, which comprises a boiler and a main turbine, wherein the boiler is connected with the main turbine and sends steam into the main turbine; the high-pressure cylinder of the main turbine is connected with the high-pressure heating system and simultaneously sends steam to the intermediate pressure cylinder through an output structure, the intermediate pressure cylinder sends the steam to the low-pressure cylinder through an output structure, and the low-pressure cylinder is connected with the power generation system and the cooling system; the ladder utilizes the steam turbine, switches on the intermediate pressure jar of main steam turbine and obtains steam from the intermediate pressure jar, the ladder utilize the steam turbine to be connected with the low pressure system of backheating, ladder utilize the steam turbine still to connect drive feed pump and motor simultaneously. The invention not only reduces the temperature of the cooling steam of the low pressure cylinder of the main turbine, ensures the safety of the low pressure cylinder, but also improves the energy utilization of the cooling steam of the low pressure regenerative system and the low pressure cylinder, increases the heat utilization efficiency of the cooling steam of the regenerative system and the low pressure cylinder, and reduces the energy loss.
Description
Technical Field
The invention relates to the technical field of turbine regenerative systems, in particular to an industrial heat supply turbine regenerative system.
Background
When the steam extraction amount of the industrial heat supply unit is large or the electric load is low for heat supply, the pressure behind the heat supply steam extraction point of the conventional heat recovery system is reduced, and the low-pressure heat recovery system cannot be normally put into operation; in addition, the temperature of industrial heat supply and water supplement is low, a large amount of high-quality steam is concentrated in a heat exchanger (such as a deaerator) to heat condensed water, the steam loses the action of acting and power generation, and a system cannot obtain more generated energy; meanwhile, steam entering a low-pressure cylinder of the main turbine needs to be throttled and decompressed through a pressure adjusting device under large differential pressure, so that pressure loss is large, and most of acting capacity is lost; the steam utilization efficiency of the whole regenerative system is poor, and more power consumption loss is caused.
It can be seen that the overall efficiency of the existing turbine regenerative system is not high, and optimization and improvement should be performed to improve the energy utilization efficiency of the regenerative system and the low-pressure cooling steam and reduce the energy loss. Therefore, a more reasonable technical scheme needs to be provided to solve the technical problems in the prior art.
Disclosure of Invention
The invention provides an industrial heat supply steam turbine heat recovery system, which improves a low-pressure heat recovery system and a structure, utilizes steam for the low-pressure heat recovery system and a low-pressure cylinder cooling system of a main steam turbine by using a steam turbine in a stepped manner, realizes the stepped utilization of the low-pressure heat recovery system and the low-pressure cylinder steam, simultaneously satisfies four functions of heating condensed water, driving a water feeding pump, cooling the low-pressure cylinder of the main steam turbine and performing work to generate power, and improves the utilization efficiency of the low-pressure heat recovery system and the low-pressure cylinder steam.
In order to achieve the above purpose, the heat recovery system disclosed by the invention can adopt the following technical scheme:
an industrial heating turbine regenerative system comprising:
the boiler is connected with the main turbine and sends steam into the main turbine; the high-pressure cylinder of the main turbine is connected with the high-pressure heating system and simultaneously sends steam to the intermediate pressure cylinder through an output structure, the intermediate pressure cylinder sends the steam to the low-pressure cylinder through an output structure, and the low-pressure cylinder is connected with the power generation system and the cooling system;
the step utilization steam turbine is connected with a low-pressure heat recovery system and is also connected with a drive water feed pump and a motor; under the low-load working condition, the motor is used as a motor and assists the step to drive the water feeding pump by using the steam turbine; under high load conditions, the motor is used as a generator and is driven by the step by the steam turbine to generate electricity.
In the regenerative system disclosed above, steam in the intermediate pressure cylinder part of the main turbine is sent to the step by the steam turbine for driving the feed pump to work; and the working state of the motor is flexibly adjusted according to the low-load working condition and the high-load working condition, on the premise that the normal work of the water feeding pump is met, the steam turbine and the motor are matched in a stepped mode, the motor complements the power of the steam turbine in a stepped mode, or the steam turbine is used for generating power by using redundant power, the utilization efficiency of steam energy is improved, and the waste of energy is reduced.
Further, in the present invention, the low-pressure regenerative system can exchange heat with low-pressure steam to utilize heat in the steam, and the arrangement of the low-pressure regenerative system is not limited uniquely, and is optimized and one of the feasible options is shown here: the low-pressure heat recovery system comprises a plurality of stages of low-pressure heaters which are respectively connected with the step utilization steam turbine, and meanwhile, the adjacent two stages of low-pressure heaters are sequentially communicated, and the final stage of low-pressure heater is connected to the deaerating device. When the scheme is adopted, the low-pressure heat recovery system and the step utilization steam turbine form a new heat recovery structure, the low-pressure heat recovery steam extraction of the main steam turbine is met, and a drain pump for recovering drained water is arranged at the last stage of low-pressure heater.
In the present invention, in order to guarantee the external work of the main turbine low-pressure cylinder, such as for power generation or other purposes, optimization is performed and one of the feasible options is shown: the ladder utilizes a steam turbine to deliver steam to a low pressure cylinder of the main turbine through at least one output structure. When the scheme is adopted, the pressure is determined by the ladder by using the steam turbine according to the steam inlet quantity of the low-pressure cylinder of the main steam turbine, the proper extraction opening is arranged, the flow entering the low-pressure cylinder is regulated, the safety of the low-pressure cylinder of the main steam turbine is ensured, and the low-pressure cylinder can be used for replacing a heat supply regulating device for throttling in a conventional system to introduce steam to the low-pressure cylinder.
Still further, in order to timely adjust the step utilization of the delivery flow between the steam turbine and the low pressure cylinder of the main turbine, optimization is performed here and one of the possible options is outlined: the step utilizes the output structure between steam turbine and the low pressure cylinder to be provided with cooling steam flow adjusting device. When such a scheme is adopted, the cooling steam flow adjusting device can adopt a flow adjusting valve.
Further, in order to guarantee the safety of the low-pressure cylinder of the main turbine and also guarantee that the steam turbine can smoothly discharge steam and reduce pressure by utilizing the steps, the optimization is carried out and one feasible selection is given out: the step utilizes a steam turbine to convey steam to a low-pressure heat recovery system through at least one path of output structure. When the scheme is adopted, the steam conveyed to the low-pressure heat recovery system can be used for heat recovery treatment.
Still further, the low pressure regenerative system recovers heat from the incoming steam, where it is optimized and one of the possible options is: the cooling system comprises a condensing device, a condensing device and a shaft seal heating device which are connected in sequence. When adopting such scheme, condensing equipment includes the condenser, and condensing equipment includes condensate pump, and bearing seal heating device includes the bearing seal heater.
Still further, the hp heating system is used for energy utilization of the hp cylinder steam of the main turbine, and the specific composition of the hp heating system is not limited uniquely, and is optimized here and one of the feasible options is: the high-pressure heating system comprises a plurality of stages of high-pressure heat exchangers which are mutually communicated, at least the last stage of high-pressure heat exchanger is communicated to the intermediate pressure cylinder and obtains steam from the intermediate pressure cylinder, and the rest high-pressure heat exchangers are communicated to the high-pressure cylinder and obtain steam from the high-pressure cylinder. When the scheme is adopted, the high-pressure cylinder provides steam power for the front stages of high-pressure heat exchangers, and the steam power of the last stage of high-pressure heat exchanger possibly has insufficient condition, so that certain steam is provided for power supplement through the intermediate pressure cylinder, the steam pressure of the intermediate pressure cylinder can be shared, and the pressure safety of the intermediate pressure cylinder is guaranteed.
Still further, the steam direction of the high pressure heating system is treated, where it is optimized and one of the possible options is presented: last one-stage high pressure heat exchanger through output structure intercommunication deaerator all the way, deaerator intercommunication feed water pump supplies water to high pressure heat exchanger through the feed water pump. When the scheme is adopted, the two paths of output structures can simultaneously carry out the shunting and conveying of steam, the pressure safety of a high-pressure heating system can be guaranteed, and the use direction of the steam is increased.
Further, in order to ensure the steam source of the high-pressure heating system and the pressure safety of the boiler, optimization is carried out and one feasible option is taken out: the first-stage high-pressure heat exchanger is also communicated with a boiler and obtains steam from the boiler. When the scheme is adopted, the steam flow entering the first-stage high-pressure heat exchanger from the boiler can be adjusted and set.
Further, the intermediate pressure cylinder delivers part of the steam to the low pressure cylinder for the low pressure cylinder to do work externally, which is optimized and one of the feasible options is: and a heat supply adjusting device is arranged on an output structure between the intermediate pressure cylinder and the low pressure cylinder. When the scheme is adopted, the heat supply adjusting device comprises a flow adjusting valve used for adjusting the flow of the steam entering the low-pressure cylinder from the intermediate pressure cylinder.
Compared with the prior art, the technical scheme disclosed by the invention has the following partial beneficial effects:
the invention fully utilizes the steam of the boiler and the main steam turbine by arranging the step utilization steam turbine, thereby not only reducing the steam temperature of the low pressure cylinder in the main steam turbine and ensuring the safety of the low pressure cylinder, but also improving the energy utilization of the steam, increasing the heat utilization efficiency of the low pressure regenerative system and the low pressure cooling steam and reducing the energy loss.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a regenerative system according to the present invention.
In the above drawings, the meaning of each reference numeral is:
1. a boiler; 2. a high pressure cylinder; 3. an intermediate pressure cylinder; 4. a heat supply regulating device; 5. a low pressure cylinder; 6. a main generator; 7. a condensing unit; 8. a condensing device; 9. a shaft seal heating device; 10. a water draining device; 11. a fourth low pressure heater; 12. a third low pressure heater; 13. a second low pressure heater; 14. a first low pressure heater; 15. a deaerator; 16. a third high pressure heat exchanger; 17. a second high pressure heat exchanger; 18. a first high pressure heat exchanger; 19. a feed pump; 20. a speed regulating device; 21. a cascade utilization steam turbine; 22. a motor; 23. a flow regulating valve.
Detailed Description
The invention is further explained below with reference to the drawings and the specific embodiments.
Aiming at the problem that the steam used by the existing steam turbine heat regeneration system and the low-pressure cylinder cooling system is wasted, the following embodiments optimize and solve the defects in the prior art.
Examples
As shown in fig. 1, the embodiment provides a regenerative system of an industrial heating turbine, which aims to improve the utilization efficiency of cooling steam of a low-pressure regenerative system and a medium-low pressure cylinder of a main turbine and reduce the energy loss of the steam.
The regenerative system provided by the present embodiment has one of the structures including:
the boiler 1 is connected with the main turbine and sends steam into the main turbine; the high pressure cylinder 2 of the main turbine is connected with the high pressure heating system and simultaneously sends steam to the intermediate pressure cylinder 3 through an output structure, the intermediate pressure cylinder 3 sends the steam to the low pressure cylinder 5 through an output structure, and the low pressure cylinder 5 is connected with the power generation system and the cooling system.
Preferably, in the present embodiment, the low-pressure regenerative system recovers heat from the entering steam, and the present embodiment is optimized and one of the feasible options is shown: the cooling system comprises a condensing device 7, a condensing device 8 and a shaft seal heating device 9 which are connected in sequence. When adopting such scheme, condensing unit 7 includes the condenser, and condensing unit 8 includes condensate pump, and bearing seal heating device 9 includes the bearing seal heater.
Preferably, the power generation system comprises a main generator 6 which is connected with the low-pressure cylinder 5 and is driven to do work to generate power.
In the present embodiment, the high-pressure heating system is used for energy utilization of the steam in the high-pressure cylinder 2 of the main turbine, the specific composition of the high-pressure heating system is not limited, and the present embodiment is optimized and adopts one of the feasible options: the high-pressure heating system comprises a plurality of stages of high-pressure heat exchangers which are mutually communicated, at least the last stage of high-pressure heat exchanger is communicated to the intermediate pressure cylinder 3 and obtains steam from the intermediate pressure cylinder 3, and the rest of high-pressure heat exchangers are communicated to the high-pressure cylinder 2 and obtain steam from the high-pressure cylinder 2. When the scheme is adopted, the high-pressure cylinder 2 provides steam power for the front stages of high-pressure heat exchangers, and the steam power of the last stage of high-pressure heat exchanger is possibly insufficient, so that a certain amount of steam is provided for power supplement through the intermediate pressure cylinder 3, the steam pressure of the intermediate pressure cylinder 3 can be shared, and the pressure safety of the intermediate pressure cylinder 3 is guaranteed.
Preferably, in this embodiment three high pressure regenerators are provided, a first high pressure regenerator 18, a second high pressure regenerator 17 and a third high pressure regenerator 16.
In this embodiment, in order to ensure the steam source of the high-pressure heating system and the pressure safety of the boiler 1, optimization is performed and one of the feasible options is adopted: the first-stage high-pressure heat exchanger is also communicated with the boiler 1 and obtains steam from the boiler 1. When the scheme is adopted, the steam flow entering the first-stage high-pressure heat exchanger from the boiler 1 can be adjusted and set.
Preferably, the steam direction of the high-pressure heating system is treated, and the embodiment is optimized and adopts one of the feasible options: last one-stage high pressure heat exchanger through output structure intercommunication deaerator 15 all the way, deaerator intercommunication feed water pump 19 and supply water to high pressure heat exchanger through feed water pump 19. When the scheme is adopted, the two paths of output structures can simultaneously carry out steam shunting and conveying, the pressure safety of a high-pressure heating system can be guaranteed, and the use direction of the steam is increased.
The second structure of the heat recovery system provided in this embodiment includes:
the ladder utilization steam turbine is connected with a low-pressure heat recovery system, and is also connected with a driving water feeding pump 19 and a motor 22; under low load conditions, the motor 22 is used as a motor and promotes the step utilization turbine to drive the feed pump 19; under high load conditions, the electric machine 22 acts as a generator 22 and is stepped to generate electricity using the turbine drive.
Preferably, in the present embodiment, a speed adjusting device 20 is disposed between the feed water pump 19 and the cascade utilization turbine for adjusting the rotation speed of the cascade utilization turbine for driving the feed water pump 19 to rotate.
In the present embodiment, the low-pressure regenerative system can exchange heat with low-pressure steam to utilize heat in the steam, the arrangement of the low-pressure regenerative system is not limited uniquely, and the present embodiment is optimized and adopts one of the feasible options: the low-pressure heat recovery system comprises a plurality of stages of low-pressure heaters which are respectively connected with the step utilization steam turbine, and meanwhile, the adjacent two stages of low-pressure heaters are sequentially communicated, and the final stage of low-pressure heater is connected to the deaerating device 15. When the scheme is adopted, the low-pressure heat recovery system and the step utilization steam turbine form a new heat recovery structure, the low-pressure heat recovery steam extraction of the main steam turbine is met, and a drain pump for recovering drained water is arranged at the last stage of low-pressure heater.
Preferably, four low pressure heaters are provided in the present embodiment, including a first low pressure heater 14, a second low pressure heater 13, a third low pressure heater 12 and a fourth low pressure heater 11.
Preferably, in order to guarantee the external work of the main turbine low-pressure cylinder 5, for example, for power generation or other purposes, the present embodiment is optimized and one of the feasible options is shown: the ladder utilizes the steam turbine to deliver steam to the low pressure cylinder 5 of the main turbine through at least one output structure. When the scheme is adopted, the pressure is determined by the ladder by using the steam turbine according to the steam inlet quantity of the main steam turbine low pressure cylinder 5, the proper extraction opening is arranged, the flow entering the low pressure cylinder 5 is regulated, the safety of the main steam turbine low pressure cylinder 5 is ensured, and the ladder can replace a heat supply regulating device 4 for throttling in a conventional system to introduce steam to the low pressure cylinder 5.
In order to adjust the step in time by means of the delivery flow between the steam turbine and the low-pressure cylinder 5 of the main turbine, the present embodiment is optimized and uses one of the possible options: the ladder is provided with a cooling steam flow adjusting device by utilizing an output structure between the steam turbine and the low pressure cylinder 5. When such a scheme is adopted, the cooling steam flow rate adjusting device can adopt the flow rate adjusting valve 23.
In order to ensure the safety of the main turbine low-pressure cylinder 5 and also ensure that the steam turbine can smoothly discharge steam and reduce pressure by using the ladder, the embodiment is optimized and adopts one of the feasible options: the step utilizes a steam turbine to convey steam to a low-pressure heat recovery system through at least one path of output structure. When the scheme is adopted, the steam conveyed to the low-pressure heat recovery system can be used for heat recovery treatment.
Preferably, the intermediate pressure cylinder 3 delivers part of the steam to the low pressure cylinder 5 for the external work of the low pressure cylinder 5, and the present embodiment is optimized and adopts one of the feasible options: and a heat supply adjusting device 4 is arranged on an output structure between the intermediate pressure cylinder 3 and the low pressure cylinder 5. When such an arrangement is used, the heating regulation means 4 comprises a flow regulating valve 23 for regulating the flow of steam from the intermediate pressure cylinder 3 into the low pressure cylinder 5.
In the regenerative system provided by the embodiment, part of steam of the intermediate pressure cylinder 3 of the main turbine is sent to the step utilization turbine for driving the feed pump 19 to work; and the working state of the motor 22 is flexibly adjusted according to the low-load working condition and the high-load working condition, on the premise that the normal work of the water feeding pump 19 is met, the step utilization steam turbine and the motor 22 are matched with each other, the motor 22 complements the power of the step utilization steam turbine, or the step utilization steam turbine uses redundant power as power generation, the utilization rate of steam energy is improved, and the waste of energy is reduced.
The above embodiments are exemplified by the present embodiment, but the present embodiment is not limited to the above optional embodiments, and persons skilled in the art can obtain other various embodiments by arbitrarily combining the above embodiments, and any person can obtain other various embodiments based on the teaching of the present embodiment. The above detailed description should not be construed as limiting the scope of the present embodiments, which should be defined in the appended claims.
Claims (10)
1. An industrial heating steam turbine regenerative system, characterized by comprising:
the boiler (1) is connected with the main turbine and sends steam into the main turbine; the high-pressure cylinder (2) of the main turbine is connected with a high-pressure heating system and simultaneously sends steam to the intermediate pressure cylinder (3) through an output structure, the intermediate pressure cylinder (3) sends the steam to the low-pressure cylinder (5) through an output structure, and the low-pressure cylinder (5) is connected with a power generation system and a cooling system;
the ladder utilization steam turbine is communicated with a middle pressure cylinder (3) of the main steam turbine and obtains steam from the middle pressure cylinder (3), the ladder utilization steam turbine is connected with a low-pressure heat recovery system, and meanwhile, the ladder utilization steam turbine is also connected with a driving water feeding pump (19) and a motor (22); under the low-load working condition, the motor (22) is used as a motor and promotes the step utilization of a steam turbine to drive the water feeding pump (19); under high load conditions, the motor (22) is used as a generator (22) and is driven by a step turbine to generate electricity.
2. An industrial heating turbine recuperator system as defined in claim 1, wherein: the low-pressure heat recovery system comprises a plurality of stages of low-pressure heaters which are respectively connected with the step utilization steam turbine, and meanwhile, the adjacent two stages of low-pressure heaters are sequentially communicated, and the final stage of low-pressure heater is connected to the deaerating device (15).
3. An industrial heating turbine recuperator system as claimed in claim 1, wherein: the cascade uses the turbine to deliver cooling steam to the low-pressure cylinder (5) of the main turbine through at least one output structure.
4. An industrial heating turbine recuperator system according to claim 3, wherein: the ladder is provided with a cooling steam flow adjusting device by utilizing an output structure between the steam turbine and the low-pressure cylinder (5).
5. An industrial heating turbine recuperator system as claimed in claim 1, wherein: the step utilizes a steam turbine to convey steam to a low-pressure heat recovery system through at least one path of output structure.
6. An industrial heating turbine recuperator system according to claim 1 or 5, wherein: the cooling system comprises a condensing device (7), a condensing device (8) and a shaft seal heating device (9) which are connected in sequence.
7. An industrial heating turbine recuperator system as defined in claim 1, wherein: the high-pressure heating system comprises a plurality of stages of high-pressure heat exchangers which are mutually communicated, at least the last stage of high-pressure heat exchanger is communicated to the intermediate pressure cylinder (3) and obtains steam from the intermediate pressure cylinder (3), and the rest of high-pressure heat exchangers are communicated to the high-pressure cylinder (2) and obtain steam from the high-pressure cylinder (2).
8. The industrial heating turbine recuperator system of claim 7, wherein: last one-level high-pressure heat exchanger through output structure intercommunication deaerator (15), deaerator intercommunication feed pump (19) and supply water to high-pressure heat exchanger through feed pump (19).
9. An industrial heating turbine recuperator system as claimed in claim 7 or 8, wherein: the first-stage high-pressure heat exchanger is also communicated with the boiler (1) and obtains steam from the boiler (1).
10. An industrial heating turbine recuperator system as claimed in claim 1, wherein: and a heat supply adjusting device (4) is arranged on an output structure between the intermediate pressure cylinder (3) and the low pressure cylinder (5).
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| CN202211647249.2A CN115929430B (en) | 2022-12-21 | 2022-12-21 | Heat regeneration system of industrial heat supply steam turbine |
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| CN202211647249.2A CN115929430B (en) | 2022-12-21 | 2022-12-21 | Heat regeneration system of industrial heat supply steam turbine |
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