CN218510934U - Drainage waste heat recovery system of low-pressure cylinder cutting cylinder heat supply unit - Google Patents
Drainage waste heat recovery system of low-pressure cylinder cutting cylinder heat supply unit Download PDFInfo
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- CN218510934U CN218510934U CN202222801840.0U CN202222801840U CN218510934U CN 218510934 U CN218510934 U CN 218510934U CN 202222801840 U CN202222801840 U CN 202222801840U CN 218510934 U CN218510934 U CN 218510934U
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- 239000002918 waste heat Substances 0.000 title claims abstract description 21
- 238000011084 recovery Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000000605 extraction Methods 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 230000002209 hydrophobic effect Effects 0.000 claims description 9
- 239000003245 coal Substances 0.000 claims description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 13
- 239000003546 flue gas Substances 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000008929 regeneration Effects 0.000 abstract 1
- 238000011069 regeneration method Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model relates to a jar heat supply unit drainage waste heat recovery system is cut to low pressure jar. The technical scheme is as follows: the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder of the steam turbine are sequentially connected, the lower side of the low-pressure cylinder is connected with a condenser, one end of a heat supply network heat exchanger is connected with the intermediate-pressure cylinder through a steam extraction regulating valve, the other end of the heat supply network heat exchanger is communicated with a tube side inlet of the low-temperature air preheater, and a tube side outlet of the low-temperature air preheater is connected with a condensed water pipeline at the outlet of the condenser through a pipeline; the fan is connected to the shell side inlet of the low-temperature air preheater through a pipeline, the shell side outlet of the low-temperature air preheater is connected to the inlet of the high-temperature air preheater through a pipeline, and the outlet of the high-temperature air preheater is connected to the boiler. The beneficial effects are that: cold air enters the high-temperature air preheater after being preheated in the low-temperature air preheater, so that the heat exchange temperature difference of the air preheater is reduced, in addition, the boiler feed water is heated by part of high-temperature flue gas, the heat regeneration steam extraction quantity of the high-pressure heater is reduced, and the heat efficiency of the unit is improved.
Description
Technical Field
The utility model relates to a thermal power generating set heat supply technical field, in particular to jar heat supply unit drainage waste heat recovery system is cut to low pressure cylinder.
Background
In recent years, in order to absorb new energy such as wind, light and the like for power generation, higher requirements are put forward on the flexibility of a coal-fired power generating set, and in order to realize thermoelectric decoupling of the coal-fired power generating set, a low-pressure cylinder zero-output technology is widely applied.
Cut under jar heat supply operating mode at low pressure jar, heat supply steam and heat supply network return water heat transfer in the heat supply network heater, because the heat transfer difference in temperature is great, lead to heat supply network heater tubular product to corrode, the hydrophobic iron content of heat supply network exceeds standard, if take the hydrophobic mode that directly flows in the oxygen-eliminating device of heat supply network, long-term the use can exert an influence to the safe operation of unit, and directly will cause thermal waste in the hydrophobic injection condenser of heat supply network with the high temperature, in addition, the air is before getting into the boiler and is preheated to the uniform temperature toward needs, with the efficiency that improves the boiler, reduce heat consumption.
The invention relates to a Chinese patent application number of 202010414206.4, which is named as 'a system and method for recovering excess pressure and waste heat in a backpressure heat supply unit', and the system comprises a backpressure steam turbine, a deaerator, a drain tank, a drain flash tank, a periodic pollution discharge flash tank, a valve from one to seven, a steam jet pump, a main pipeline and a bypass pipeline. When the valve operates normally, the third valve and the fourth valve are closed, and the rest valves are opened; the exhaust steam of the back pressure steam turbine is sent to a steam jet pump to be used as working steam, after the steam jet pump extracts the exhaust steam of the periodic blowdown flash tank, the drainage flash tank and the drainage tank, the pressure is reduced to be medium-pressure steam which can be utilized by a deaerator, and the medium-pressure steam enters the deaerator; if the steam jet pump breaks down, the third valve and the fourth valve of the bypass are opened, the first valve and the second valve are closed, and the system can continue to work, so that the continuous operation of the system is ensured. However, the invention is not suitable for thermoelectric decoupling of a coal-fired power generating unit and is not suitable for the zero-output technology of a low-pressure cylinder.
Therefore, a drainage waste heat recovery system of the low-pressure cylinder cutting heat supply unit needs to be designed to meet the requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a jar heat supply unit drainage waste heat recovery system is cut to low pressure jar to the above-mentioned defect that prior art exists, utilizes the hydrophobic waste heat realization of the cold air absorption heat supply network of boiler import to preheat, has reduced the cold source loss, and the coal-fired flue gas of saving is used for heating boiler's feedwater, has reduced the required steam volume of high pressure feed water heater system, has improved the thermal efficiency of unit.
The utility model provides a hydrophobic waste heat recovery system of jar heat supply unit is cut to low pressure jar, its technical scheme is: comprises a boiler (1), a high-pressure steam turbine cylinder (2), an intermediate-pressure cylinder (3), a heat supply butterfly valve (4), a low-pressure cylinder (5), a condenser (6), a condensate pump (7), a condensate fine treatment device (8), a first low-pressure heater (9), a deaerator (10), a water supply pump (11), a third high-pressure heater (12), a second high-pressure heater (13), a first high-pressure heater (14), a heat supply network heat exchanger (15), a steam extraction regulating valve (16), a low-temperature air preheater (17), a fan (18), a high-temperature air preheater (19) and a coal economizer (20),
the low-pressure steam turbine comprises a high-pressure steam turbine cylinder (2), an intermediate-pressure steam turbine cylinder (3) and a low-pressure steam turbine cylinder (5) connected with the intermediate-pressure steam turbine cylinder (3) through a heat supply butterfly valve (4), wherein the lower side of the low-pressure steam turbine cylinder (5) is connected with a condenser (6), and the condenser (6) is connected with a deaerator (10) sequentially through a condensate pump (7), a condensate fine treatment device (8) and a first low-pressure heater (9); the deaerator (10) is connected with the boiler (1) through a feed water pump (11), a third high-pressure heater (12), a second high-pressure heater (13) and a first high-pressure heater (14);
one end of the heat supply network heat exchanger (15) is connected with the intermediate pressure cylinder (3) through a steam extraction regulating valve (16), the other end of the heat supply network heat exchanger (15) is communicated to a tube side inlet of the low-temperature air preheater (17), and a tube side outlet of the low-temperature air preheater (17) is connected with a condensed water pipeline at an outlet of the condenser (6) through a pipeline; the fan (18) is connected to the shell side inlet of the low-temperature air preheater (17) through a pipeline, the shell side outlet of the low-temperature air preheater (17) is connected to the inlet of the high-temperature air preheater (19) through a pipeline, and the outlet of the high-temperature air preheater (19) is connected to the boiler (1).
Wherein, two pipelines are arranged at the lower part of the boiler (1), one pipeline is connected to the shell side inlet at the upper end of the high-temperature air preheater (19), and the other pipeline is connected to the shell side inlet of the economizer (20).
Wherein, the tube side inlet of the economizer (20) is connected to the pipeline at the outlet end of the water pump (11) through a pipeline, and the tube side outlet of the economizer (20) is connected to the outlet pipeline of the first high-pressure heater (14) through a pipeline.
Wherein, the first high-pressure heater (14) and the second high-pressure heater (13) are respectively connected with the high-pressure cylinder (2) of the steam turbine through pipelines.
Wherein, the third high-pressure heater (12), the deaerator (10) and the first low-pressure heater (9) are respectively connected with the intermediate pressure cylinder (3) through pipelines.
Wherein, the upper end of the third high-pressure heater (12) is connected to the deaerator (10) through a pipeline, and the drain water of the third high-pressure heater (12) is sent to the deaerator (10).
Wherein, the upper end of the first low-pressure heater (9) is connected with one side of the condenser (6) through a pipeline.
The utility model has the advantages that: the utility model discloses a combine hydrophobic waste heat recovery of heat supply network and the preheating of air, waste heat recovery system still includes low temperature air heater and high temperature air heater, it has the fan to establish ties in proper order on the intake stack of boiler, low temperature air heater and high temperature air heater, and, the coal-fired flue gas pipeline of boiler divide into two pipelines, one of them pipeline is connected with high temperature air heater, another pipeline communicates with the economizer, cold air gets into high temperature air heater again after being preheated in low temperature air heater, the heat transfer difference of air heater has been reduced, air heater's the efficiency of 15794improves, in addition, heat boiler feed water with the flue gas of partial high temperature, high pressure heater's backheat steam extraction has been reduced, the thermal efficiency of unit has been improved, therefore, can effectively reduce the hydrophobic temperature of heat supply network, the life of extension condensate water finishing device.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention;
fig. 2 is a schematic structural view of embodiment 2 of the present invention;
fig. 3 is a schematic structural view of embodiment 3 of the present invention;
fig. 4 is a schematic structural view of embodiment 4 of the present invention;
fig. 5 is a schematic structural view of embodiment 5 of the present invention;
in the upper drawing: the system comprises a boiler 1, a steam turbine high-pressure cylinder 2, an intermediate-pressure cylinder 3, a heat supply butterfly valve 4, a low-pressure cylinder 5, a condenser 6, a condensate pump 7, a condensate fine treatment device 8, a first low-pressure heater 9, a deaerator 10, a water feed pump 11, a third high-pressure heater 12, a second high-pressure heater 13, a first high-pressure heater 14, a heat supply network heat exchanger 15, a steam extraction regulating valve 16, a low-temperature air preheater 17, a fan 18, a high-temperature air preheater 19 and an economizer 20.
Detailed Description
The preferred embodiments of the present invention will be described hereinafter with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustration and explanation, and are not intended to limit the present invention.
Embodiment 1, referring to fig. 1, the utility model provides a hydrophobic waste heat recovery system of low-pressure cylinder cutting heat supply unit, which comprises a boiler 1, a steam turbine high-pressure cylinder 2, an intermediate-pressure cylinder 3, a heat supply butterfly valve 4, a low-pressure cylinder 5, a condenser 6, a condensate pump 7, a condensate polishing device 8, a first low-pressure heater 9, a deaerator 10, a feed pump 11, a third high-pressure heater 12, a second high-pressure heater 13, a first high-pressure heater 14, a heat supply network heat exchanger 15, a steam extraction regulating valve 16, a low-temperature air preheater 17, a fan 18, a high-temperature air preheater 19 and an economizer 20,
the system comprises a high-pressure turbine cylinder 2, a medium-pressure turbine cylinder 3 and a low-pressure turbine cylinder 5 connected with the medium-pressure turbine cylinder 3 through a heat supply butterfly valve 4, wherein the lower side of the low-pressure turbine cylinder 5 is connected with a condenser 6, and the condenser 6 and a deaerator 10 are connected through a condensate pump 7, a condensate fine treatment device 8 and a first low-pressure heater 9 in sequence; the deaerator 10 is connected with the boiler 1 through a feed water pump 11, a third high-pressure heater 12, a second high-pressure heater 13 and a first high-pressure heater 14;
one end of the heat supply network heat exchanger 15 is connected with the intermediate pressure cylinder 3 through a steam extraction regulating valve 16, the other end of the heat supply network heat exchanger 15 is communicated with a tube pass inlet of a low-temperature air preheater 17, and a tube pass outlet of the low-temperature air preheater 17 is connected with a condensed water pipeline at the outlet of the condenser 6 through a pipeline; the fan 18 is connected to the shell-side inlet of the low-temperature air preheater 17 through a pipeline, the shell-side outlet of the low-temperature air preheater 17 is connected to the inlet of the high-temperature air preheater 19 through a pipeline, and the outlet of the high-temperature air preheater 19 is connected to the boiler 1.
Wherein, the lower part of the boiler 1 is provided with two pipelines, one pipeline is connected to the upper end shell side inlet of the high temperature air preheater 19, and the other pipeline is connected to the shell side inlet of the economizer 20.
Wherein, the tube side inlet of the economizer 20 is connected to the pipeline at the outlet end of the water pump 11 through a pipeline, and the tube side outlet of the economizer 20 is connected to the outlet pipeline of the first high-pressure heater 14 through a pipeline.
Wherein, the first high pressure heater 14 and the second high pressure heater 13 are respectively connected with the turbine high pressure cylinder 2 through pipelines.
The third high-pressure heater 12, the deaerator 10 and the first low-pressure heater 9 are respectively connected with the intermediate pressure cylinder 3 through pipelines.
Wherein, the upper end of the third high-pressure heater 12 is connected to the deaerator 10 through a pipeline, and the drained water of the third high-pressure heater 12 is sent to the deaerator 10.
Wherein, the upper end of the first low-pressure heater 9 is connected with one side of the condenser 6 through a pipeline.
The utility model discloses a use includes as follows:
under the working condition that the low-pressure cylinder of the steam turbine is cut off for supplying heat, only a small part of cooling steam is reserved by adjusting the heat supply butterfly valve 4 to enter the low-pressure cylinder 5 of the steam turbine, the steam extraction adjusting valve 16 is kept fully opened, at the moment, most of the exhaust steam of the intermediate pressure cylinder 3 enters the heat supply network heat exchanger 15 to heat the return water of the heat supply network, the drain water of the high-temperature heat supply network is firstly reduced to a proper temperature by the low-temperature air preheater 17, and then is mixed with the low-temperature condensed water discharged by the condenser 6 to enter the condensed water pump 7;
after being pressurized by the fan 18, the air entering the boiler firstly enters the low-temperature air preheater 17 to absorb the waste heat of the drainage of the heat supply network for primary heating, and then enters the high-temperature air preheater 19 to exchange heat with the flue gas discharged by the boiler for secondary heating. Because the heat load of the high-temperature air preheater 19 is reduced compared with that before heat supply of a cutting cylinder, a part of the boiler flue gas is divided into a part of the boiler flue gas and enters the economizer 20 to be used for heating the boiler feed water divided from the front of the third high-pressure heater 12, and the cooled flue gas is mixed and then enters the subsequent processes of desulfurization and denitrification and the like.
Embodiment 2, referring to fig. 2, is different from embodiment 1 in that:
the economizer 20 is eliminated so that the flue gas of the boiler 1 is connected to the upper shell side inlet of the high temperature air preheater 19 by only one pipeline.
The high-temperature heat supply network drainage is firstly reduced to a proper temperature through the low-temperature air preheater 17, then mixed with low-temperature condensed water discharged from the condenser 6, enters the condensed water pump 7, enters air of the boiler, is pressurized through the fan 18, firstly enters the low-temperature air preheater 17 to absorb the waste heat of the heat supply network drainage for primary heating, and then enters the high-temperature air preheater 19 to exchange heat with flue gas discharged from the boiler for secondary heating.
Example 3, referring to fig. 3, differs from example 1 in that:
the shell-side outlet of the economizer 20 is connected to an air preheating pipeline through a pipeline, particularly to a pipeline at the outlet of the low-temperature air preheater 17, so that high-temperature flue gas discharged from the shell-side outlet of the economizer 20 can be mixed with air heated for the first time by the low-temperature air preheater 17, the temperature of the air is further increased, and the heat energy in the flue gas is further utilized.
the output end of the low-temperature air preheater 17 is connected to the output end pipeline of the high-temperature air preheater 19 through a pipeline, the output end of the fan 18 is divided into two pipelines, one pipeline is connected to the low-temperature air preheater 17, and the other pipeline is directly connected to the high-temperature air preheater 19, so that whether secondary heating is needed can be adjusted at any time according to the needs of the site.
Example 5, referring to fig. 5, differs from example 4 in that:
the shell-side outlet of the economizer 20 is respectively connected to two pipelines for preheating air through pipelines, so that the heat energy of the flue gas can be more fully utilized.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solutions described above. Therefore, any simple modifications or equivalent changes made according to the technical solution of the present invention belong to the scope of the present invention as far as possible.
Claims (7)
1. The utility model provides a hydrophobic waste heat recovery system of jar heat supply unit is cut to low pressure jar, characterized by: comprises a boiler (1), a high-pressure steam turbine cylinder (2), an intermediate-pressure cylinder (3), a heat supply butterfly valve (4), a low-pressure cylinder (5), a condenser (6), a condensate pump (7), a condensate fine treatment device (8), a first low-pressure heater (9), a deaerator (10), a water supply pump (11), a third high-pressure heater (12), a second high-pressure heater (13), a first high-pressure heater (14), a heat supply network heat exchanger (15), a steam extraction regulating valve (16), a low-temperature air preheater (17), a fan (18), a high-temperature air preheater (19) and a coal economizer (20),
the low-pressure steam turbine comprises a high-pressure steam turbine cylinder (2), an intermediate-pressure steam turbine cylinder (3) and a low-pressure steam turbine cylinder (5) connected with the intermediate-pressure steam turbine cylinder (3) through a heat supply butterfly valve (4), wherein the lower side of the low-pressure steam turbine cylinder (5) is connected with a condenser (6), and the condenser (6) is connected with a deaerator (10) sequentially through a condensate pump (7), a condensate fine treatment device (8) and a first low-pressure heater (9); the deaerator (10) is connected with the boiler (1) through a water feeding pump (11), a third high-pressure heater (12), a second high-pressure heater (13) and a first high-pressure heater (14);
one end of the heat supply network heat exchanger (15) is connected with the intermediate pressure cylinder (3) through a steam extraction regulating valve (16), the other end of the heat supply network heat exchanger (15) is communicated to a tube side inlet of the low-temperature air preheater (17), and a tube side outlet of the low-temperature air preheater (17) is connected with a condensed water pipeline at an outlet of the condenser (6) through a pipeline; the fan (18) is connected to the shell side inlet of the low-temperature air preheater (17) through a pipeline, the shell side outlet of the low-temperature air preheater (17) is connected to the inlet of the high-temperature air preheater (19) through a pipeline, and the outlet of the high-temperature air preheater (19) is connected to the boiler (1).
2. The drain waste heat recovery system of the low-pressure cylinder cutting cylinder heat supply unit as claimed in claim 1, wherein: and two pipelines are arranged on the lower part of the boiler (1), one pipeline is connected to the shell side inlet of the upper end of the high-temperature air preheater (19), and the other pipeline is connected to the shell side inlet of the economizer (20).
3. The drain waste heat recovery system of the low-pressure cylinder cutting cylinder heat supply unit as claimed in claim 2, characterized in that: the tube side inlet of the economizer (20) is connected to a pipeline at the outlet end of the water pump (11) through a pipeline, and the tube side outlet of the economizer (20) is connected to an outlet pipeline of the first high-pressure heater (14) through a pipeline.
4. The drain waste heat recovery system of the low-pressure cylinder cutting cylinder heat supply unit as claimed in claim 3, wherein: the first high-pressure heater (14) and the second high-pressure heater (13) are respectively connected with the steam turbine high-pressure cylinder (2) through pipelines.
5. The drain waste heat recovery system of the low-pressure cylinder cutting cylinder heat supply unit as claimed in claim 4, characterized in that: and the third high-pressure heater (12), the deaerator (10) and the first low-pressure heater (9) are respectively connected with the intermediate pressure cylinder (3) through pipelines.
6. The drain waste heat recovery system of the low-pressure cylinder cutting cylinder heat supply unit as claimed in claim 1, wherein: the upper end of the third high-pressure heater (12) is connected into the deaerator (10) through a pipeline, and the drained water of the third high-pressure heater (12) is sent to the deaerator (10).
7. The drain waste heat recovery system of the low-pressure cylinder cutting cylinder heat supply unit as claimed in claim 1, characterized in that: the upper end of the first low-pressure heater (9) is connected with one side of the condenser (6) through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222801840.0U CN218510934U (en) | 2022-10-24 | 2022-10-24 | Drainage waste heat recovery system of low-pressure cylinder cutting cylinder heat supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222801840.0U CN218510934U (en) | 2022-10-24 | 2022-10-24 | Drainage waste heat recovery system of low-pressure cylinder cutting cylinder heat supply unit |
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| Publication Number | Publication Date |
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| CN218510934U true CN218510934U (en) | 2023-02-21 |
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| CN202222801840.0U Active CN218510934U (en) | 2022-10-24 | 2022-10-24 | Drainage waste heat recovery system of low-pressure cylinder cutting cylinder heat supply unit |
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| CN (1) | CN218510934U (en) |
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- 2022-10-24 CN CN202222801840.0U patent/CN218510934U/en active Active
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