CN115653706A - Steam turbine waste heat utilization system and control method thereof - Google Patents
Steam turbine waste heat utilization system and control method thereof Download PDFInfo
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- CN115653706A CN115653706A CN202211241387.0A CN202211241387A CN115653706A CN 115653706 A CN115653706 A CN 115653706A CN 202211241387 A CN202211241387 A CN 202211241387A CN 115653706 A CN115653706 A CN 115653706A
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Abstract
The invention discloses a steam turbine waste heat utilization system which comprises a steam ejector, wherein an air inlet of the steam ejector is connected with an exhaust pipe of a low-pressure cylinder of a steam turbine, the steam ejector is connected with a low-temperature water inlet pipe and a high-temperature water outlet pipe, low-temperature water in the low-temperature water inlet pipe absorbs heat in the steam ejector and is changed into high-temperature water and then is discharged from the high-temperature water outlet pipe, an air outlet of the steam ejector is connected with a low-temperature heat source inlet of a heat absorption heat pump, a condensed water drain pipe of the heat absorption heat pump is connected with the low-temperature water inlet pipe, the exhaust pipe of the low-pressure cylinder of the steam turbine is connected with the high-temperature heat source inlet of the heat absorption heat pump, the heat absorption heat pump is connected with the low-temperature water inlet pipe and a medium-temperature water outlet pipe, and low-temperature water in the low-temperature water inlet pipe absorbs heat in the heat absorption heat pump and is changed into medium-temperature water and then is discharged from the medium-temperature water outlet pipe. The invention can improve the defects of the prior art and improve the waste heat utilization rate of the steam turbine unit of the thermal power plant.
Description
Technical Field
The invention relates to the technical field of waste heat recycling of a steam turbine, in particular to a waste heat recycling system of the steam turbine and a control method of the waste heat recycling system.
Background
After the steam turbine of the thermal power plant applies work to drive the generator to start, a large amount of high-temperature exhaust steam can be generated. In order to improve the overall efficiency of the coal-fired unit, the waste heat of the high-temperature exhaust steam needs to be recycled for the second time. In the existing waste heat recovery system, the waste heat recovery of the high-temperature exhaust steam is usually realized through the heat exchange between the high-temperature exhaust steam and low-temperature water, but the recovery rate is only 30-40%.
Disclosure of Invention
The invention aims to provide a turbine waste heat utilization system and a control method thereof, which can overcome the defects of the prior art and improve the waste heat utilization rate of a turbine unit of a thermal power plant.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
The utility model provides a steam turbine waste heat utilization system, including the steam ejector, the air inlet and the steam turbine low pressure cylinder blast pipe of steam ejector are connected, be connected with low temperature water inlet tube and high temperature water outlet pipe on the steam ejector, low temperature water in the low temperature water inlet tube absorbs heat in the steam ejector and becomes high temperature water after discharging from the high temperature water outlet pipe, the gas outlet of steam ejector links to each other with the low temperature heat source import of heat absorption formula heat pump, the comdenstion water drain pipe of heat absorption formula heat pump links to each other with the low temperature water inlet tube, steam turbine low pressure cylinder blast pipe links to each other with the high temperature heat source import of heat absorption formula heat pump, be connected with low temperature water inlet tube and well warm water outlet pipe on the heat absorption formula heat pump, the low temperature water of low temperature water inlet tube absorbs heat in the heat absorption formula heat pump and becomes well warm water after the well warm water is discharged from well warm water outlet pipe.
Preferably, a heat exchange plate is installed in the steam ejector, a steam spraying head is installed at the inner side end of an air inlet of the steam ejector, a diversion cavity is arranged in the heat exchange plate, the liquid inlet end of the diversion cavity is connected with a low-temperature water inlet pipe, a water spraying head is installed at the liquid outlet end of the diversion cavity, a plurality of through grooves are formed in the heat exchange plate, and a steam-water separator is installed on an air outlet of the steam ejector.
Preferably, one side of the heat exchange plate, which faces the steam jet head, is provided with a plurality of vertical grooves, the grooves and the through grooves are arranged alternately, a plurality of mutually separated fins are installed in the grooves, and first through holes communicated with the through grooves are formed in two sides of the grooves.
Preferably, a flow regulating valve is installed on the high-temperature water outlet pipe, a certain amount of high-temperature water is stored at the bottom of the steam ejector through the control of the water outlet flow of the high-temperature water, the steam jet head is positioned below the liquid level of the high-temperature water, and the steam jet head is provided with an aeration disc.
Preferably, the sprinkler head comprises a plurality of sprinkler holes arranged side by side, the spraying directions of the adjacent sprinkler holes are mutually crossed, and the spraying directions of all the sprinkler holes are positioned in the same plane.
Preferably, a spiral flow guide pipe is arranged in the steam-water separator, the spiral flow guide pipe is connected with an inlet of the steam-water separator, a plurality of second through holes are uniformly formed in the spiral flow guide pipe, a single-leaf hyperboloid-shaped arc-shaped baffle is arranged on the outer side of the spiral flow guide pipe, and an expanding opening is formed in the outlet end of the spiral flow guide pipe and is located inside the arc-shaped baffle.
A control method of a turbine waste heat utilization system comprises the following steps:
high-temperature exhaust steam of the steam turbine is discharged from an exhaust pipe of a low-pressure cylinder of the steam turbine and enters a steam ejector to perform primary heat exchange with low-temperature water to prepare high-temperature water, the low-temperature exhaust steam subjected to the primary heat exchange enters a heat absorption type heat pump, the high-temperature exhaust steam is used as a driving heat source, the low-temperature exhaust steam and the low-temperature water perform secondary heat exchange to prepare medium-temperature water, and condensed water generated by the heat absorption type heat pump flows back to a low-temperature water inlet pipe to be recycled.
Adopt the beneficial effect that above-mentioned technical scheme brought to lie in: the invention adopts a two-stage heat exchange structure, and fully recovers the heat in the exhaust steam. The first stage heat exchange adopts a steam jet contact heat exchange mode, and the second stage heat exchange adopts a heat pump heat exchange mode. The invention is also a targeted improvement for the steam ejector. The invention abandons the mode of direct injection heat exchange of steam, firstly, high-temperature exhaust steam is introduced into high-temperature water for primary heat exchange, the flow rate of the high-temperature exhaust steam flowing out of the high-temperature water is reduced, and secondary heat exchange is carried out on the surface of the heat exchange plate. Because the surface of the heat exchange plate adopts the mode of alternately arranging the grooves and the through grooves, the high-temperature exhaust steam with reduced flow speed can fully contact with the fins in the grooves for heat exchange, and then flows through the heat exchange plate through the first through holes and the through grooves, so that the turbulence generated by the high-temperature exhaust steam in the area of the heat exchange plate is reduced. The high-temperature exhaust steam passing through the heat exchange plate and water flow sprayed out of the water spray heads carry out third heat exchange, and the water curtain can be generated by the spraying of the water spray heads, so that the heat exchange efficiency of the exhaust steam and the water body is further improved. And the waste steam after the three times of low-temperature heat exchange enters a heat pump after moisture is separated by a steam-water separator, and high-temperature waste steam is used as a driving heat source to carry out fourth time of heat exchange on the low-temperature waste steam, so that the heat of the waste steam is fully utilized. The steam-water separator is provided with an inner layer and an outer layer of separation structures, so that the steam-water separation efficiency is effectively improved.
Drawings
FIG. 1 is a block diagram of one embodiment of the present invention.
FIG. 2 is a block diagram of a steam injector in accordance with an embodiment of the present invention.
Fig. 3 is an enlarged view of a portion of a heat exchange plate according to an embodiment of the present invention.
Fig. 4 is a block diagram of a steam-water separator according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1 to 4, one embodiment of the present invention includes a steam ejector 2, an air inlet of the steam ejector 2 is connected to a steam turbine low-pressure cylinder exhaust pipe 1, the steam ejector 2 is connected to a low-temperature water inlet pipe 3 and a high-temperature water outlet pipe 4, low-temperature water in the low-temperature water inlet pipe 3 absorbs heat in the steam ejector 2 and is changed into high-temperature water, and then is discharged from the high-temperature water outlet pipe 4, an air outlet of the steam ejector 2 is connected to a low-temperature heat source inlet of an endothermic heat pump 5, a condensate water outlet pipe 6 of the endothermic heat pump 5 is connected to the low-temperature water inlet pipe 3, the steam turbine low-pressure cylinder exhaust pipe 1 is connected to a high-temperature heat source inlet of the endothermic heat pump 5, the endothermic heat pump 5 is connected to a low-temperature water inlet pipe 3 and a medium-temperature water outlet pipe 7, and low-temperature water in the low-temperature water inlet pipe 3 absorbs heat in the endothermic heat pump 5 and is changed into medium-temperature water, and then is discharged from the medium-temperature water outlet pipe 7. A heat exchange plate 8 is installed in the steam ejector 2, a steam spraying head 9 is installed at the inner side end of an air inlet of the steam ejector 2, a flow guide cavity 10 is arranged in the heat exchange plate 8, the liquid inlet end of the flow guide cavity 10 is connected with a low-temperature water inlet pipe 3, a water spraying head 11 is installed at the liquid outlet end of the flow guide cavity 10, a plurality of through grooves 12 are formed in the heat exchange plate 8, and a steam-water separator 13 is installed on an air outlet of the steam ejector 2. One side of the heat exchange plate 8 facing the steam jet head 9 is provided with a plurality of vertical grooves 14, the grooves 14 and the through grooves 12 are arranged alternately, a plurality of mutually separated fins 15 are installed in the grooves 14, and first through holes 16 communicated with the through grooves 12 are arranged on two sides of the grooves 14. The high-temperature water outlet pipe 4 is provided with a flow regulating valve 17, the bottom of the steam ejector 2 is stored with a certain amount of high-temperature water by controlling the flow of the high-temperature water, the steam jet head 9 is positioned on the surface of the high-temperature water, and the steam jet head 9 is provided with an aeration disc 18. The sprinkler head 11 comprises a plurality of sprinkler holes 19 arranged side by side, the spraying directions of the adjacent sprinkler holes 19 are mutually crossed, and the spraying directions of all the sprinkler holes 19 are positioned in the same plane. Be provided with spiral honeycomb duct 20 in the catch water 13, spiral honeycomb duct 20 links to each other with catch water 13's import, evenly is provided with a plurality of second through-hole 21 on the spiral honeycomb duct 20, and the spiral honeycomb duct 20 outside is provided with the cowl 22 of single leaf hyperboloid shape, and the exit end of spiral honeycomb duct 20 is provided with flaring 23, and flaring 23 is located inside cowl 22.
A control method of the turbine waste heat utilization system comprises the following steps:
high-temperature exhaust steam of the steam turbine is discharged from a steam turbine low-pressure cylinder exhaust pipe 1, enters a steam ejector 2 to perform primary heat exchange with low-temperature water to prepare high-temperature water, the low-temperature exhaust steam subjected to the primary heat exchange enters a heat absorption type heat pump 5, the high-temperature exhaust steam is used as a driving heat source, the low-temperature exhaust steam and the low-temperature water perform secondary heat exchange to prepare medium-temperature water, and condensate water generated by the heat absorption type heat pump 5 flows back to a low-temperature water inlet pipe 3 to be recycled.
The waste heat utilization rate of the high-temperature exhaust steam of the steam turbine can reach 45-47%, the waste heat utilization rate of the exhaust steam of the steam turbine is effectively improved, and the operation cost of a power plant is saved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a steam turbine waste heat utilization system which characterized in that: the steam ejector is characterized by comprising a steam ejector (2), wherein an air inlet of the steam ejector (2) is connected with a steam turbine low-pressure cylinder exhaust pipe (1), the steam ejector (2) is connected with a low-temperature water inlet pipe (3) and a high-temperature water outlet pipe (4), low-temperature water in the low-temperature water inlet pipe (3) absorbs heat in the steam ejector (2) and becomes high-temperature water and then is discharged from the high-temperature water outlet pipe (4), an air outlet of the steam ejector (2) is connected with a low-temperature heat source inlet of a heat absorption type heat pump (5), a condensed water drain pipe (6) of the heat absorption type heat pump (5) is connected with the low-temperature water inlet pipe (3), the steam turbine low-pressure cylinder exhaust pipe (1) is connected with a high-temperature heat source inlet of the heat absorption type heat pump (5), the heat absorption type heat pump (5) is connected with the low-temperature water inlet pipe (3) and the medium-temperature water outlet pipe (7), and low-temperature water of the low-temperature water inlet pipe (3) absorbs heat in the heat absorption type heat pump (5) and becomes medium-temperature water and then is discharged from the medium-temperature water outlet pipe (7).
2. The turbine waste heat utilization system of claim 1, wherein: install heat transfer board (8) in steam ejector (2), steam ejector (2) air inlet medial extremity installs spouts vapour head (9), is provided with water conservancy diversion cavity (10) in heat transfer board (8), and the feed liquor end of water conservancy diversion cavity (10) links to each other with low temperature water inlet tube (3), and sprinkler bead (11) are installed to the play liquid end of water conservancy diversion cavity (10), are provided with a plurality of logical groove (12) on heat transfer board (8), install catch water (13) on the gas outlet of steam ejector (2).
3. The turbine waste heat utilization system of claim 2, wherein: one side of the heat exchange plate (8) facing the steam jet head (9) is provided with a plurality of vertical grooves (14), the grooves (14) and the through grooves (12) are arranged in an alternating mode, a plurality of mutually separated fins (15) are installed in the grooves (14), and first through holes (16) communicated with the through grooves (12) are formed in two sides of the grooves (14).
4. The turbine waste heat utilization system of claim 3, wherein: the high-temperature water outlet pipe (4) is provided with a flow regulating valve (17), the bottom of the steam ejector (2) is stored with a certain amount of high-temperature water through the control of the water flow of the high-temperature water, the steam jet head (9) is positioned below the surface of the high-temperature water, and the steam jet head (9) is provided with an aeration disc (18).
5. The turbine waste heat utilization system of claim 4, wherein: the sprinkler head (11) comprises a plurality of water spraying holes (19) which are arranged side by side, the spraying directions of the adjacent water spraying holes (19) are mutually crossed, and the spraying directions of all the water spraying holes (19) are positioned in the same plane.
6. The turbine waste heat utilization system of claim 5, wherein: the steam-water separator is characterized in that a spiral guide pipe (20) is arranged in the steam-water separator (13), the spiral guide pipe (20) is connected with an inlet of the steam-water separator (13), a plurality of second through holes (21) are uniformly formed in the spiral guide pipe (20), an arc-shaped baffle (22) in a single-sheet hyperboloid shape is arranged on the outer side of the spiral guide pipe (20), a flaring (23) is formed in the outlet end of the spiral guide pipe (20), and the flaring (23) is located inside the arc-shaped baffle (22).
7. A control method of a turbine waste heat utilization system is characterized by comprising the following steps:
high-temperature exhaust steam of the steam turbine is discharged from an exhaust pipe (1) of a low-pressure cylinder of the steam turbine and enters a steam ejector (2) to perform primary heat exchange with low-temperature water to prepare high-temperature water, the low-temperature exhaust steam after the primary heat exchange enters a heat absorption type heat pump (5), the high-temperature exhaust steam is used as a driving heat source, the low-temperature exhaust steam and the low-temperature water perform secondary heat exchange to prepare medium-temperature water, and condensed water generated by the heat absorption type heat pump (5) flows back to a low-temperature water inlet pipe (3) to be recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211241387.0A CN115653706A (en) | 2022-10-11 | 2022-10-11 | Steam turbine waste heat utilization system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211241387.0A CN115653706A (en) | 2022-10-11 | 2022-10-11 | Steam turbine waste heat utilization system and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115653706A true CN115653706A (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211241387.0A Pending CN115653706A (en) | 2022-10-11 | 2022-10-11 | Steam turbine waste heat utilization system and control method thereof |
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| Country | Link |
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| CN (1) | CN115653706A (en) |
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- 2022-10-11 CN CN202211241387.0A patent/CN115653706A/en active Pending
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