CN219976369U - Flexible heating system of double-pressure combined cycle unit - Google Patents
Flexible heating system of double-pressure combined cycle unit Download PDFInfo
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- CN219976369U CN219976369U CN202320747282.6U CN202320747282U CN219976369U CN 219976369 U CN219976369 U CN 219976369U CN 202320747282 U CN202320747282 U CN 202320747282U CN 219976369 U CN219976369 U CN 219976369U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 16
- 230000009977 dual effect Effects 0.000 claims description 15
- 238000000605 extraction Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000002918 waste heat Substances 0.000 abstract description 24
- 239000007789 gas Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
The utility model discloses a flexible heating system of a double-pressure combined cycle unit, which comprises a waste heat boiler, a steam turbine, a double-pressure steam supply unit and an external steam supply pipeline, wherein the waste heat boiler is provided with a high-pressure steam pipeline and a low-pressure steam pipeline, the waste heat boiler is connected with the steam turbine pipeline through the high-pressure steam pipeline and the low-pressure steam pipeline, the waste heat boiler is also connected with the double-pressure steam supply unit pipeline through the high-pressure steam pipeline and the low-pressure steam pipeline, the double-pressure steam supply unit and the steam turbine are both connected with the external steam supply pipeline, the problem of insufficient heat supply capacity of a condensing steam turbine is solved, meanwhile, the double-pressure steam supply unit matches low-pressure steam and high-pressure steam generated by the waste heat boiler, and the matched steam is used for supplying heat to the outside through the external steam supply pipeline, so that the heat loss of the low-pressure steam is reduced.
Description
Technical Field
The utility model belongs to the technical field of heat supply, and particularly relates to a flexible heat supply system of a double-pressure combined cycle unit.
Background
The traditional heat supply mode adopts a condensing turbine to supply heat, the operation mode is more than that of a single condensing turbine, the heat and electric loads can be adjusted within a certain range, but in recent years, along with the improvement of the industrial heat supply requirement, the condensing turbine is insufficient in heat supply capacity and inflexible in operation mode, in addition, the low-pressure steam generated by a waste heat boiler is low in parameters and cannot be used for heat supply, the condensing turbine is also not suitable for low-load operation of the turbine, the low-pressure steam cannot be effectively utilized, and the heat loss is large.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a flexible heating system of a double-pressure combined cycle unit.
The specific scheme is as follows:
the utility model provides a dual pressure combined cycle unit flexibility heating system, includes exhaust-heat boiler, steam turbine, dual pressure steam supply unit and external steam supply pipeline, be provided with high pressure steam pipe and low pressure steam pipe on the exhaust-heat boiler, exhaust-heat boiler pass through high pressure steam pipe and low pressure steam pipe with the steam turbine pipe connection, exhaust-heat boiler still passes through high pressure steam pipe and low pressure steam pipe and is connected with dual pressure steam supply unit pipeline, dual pressure steam supply unit and steam turbine all with external steam supply pipeline connection.
The steam turbine is provided with a high-pressure cylinder and a low-pressure cylinder, the low-pressure cylinder is provided with a first shutoff valve, the high-pressure cylinder is provided with a second shutoff valve, the low-pressure cylinder is connected with the low-pressure steam pipeline through the first shutoff valve, and the high-pressure cylinder is connected with the high-pressure steam pipeline through the second shutoff valve.
The steam turbine is provided with a steam extraction pipeline, the steam extraction pipeline is provided with a third shut-off valve, and the steam extraction pipeline is connected with the external steam supply pipeline through the third shut-off valve.
The double-pressure steam supply unit comprises a steam pressure matcher, a first steam inlet, a second steam inlet and a steam outlet are arranged on the steam pressure matcher, a fourth shut-off valve is arranged on the first steam inlet, a fifth shut-off valve is arranged on the second steam inlet, the first steam inlet is connected with the high-pressure steam pipeline through the fourth shut-off valve, the second steam inlet is connected with the low-pressure steam pipeline through the fifth shut-off valve, a sixth shut-off valve is arranged on the steam outlet, and the steam outlet is connected with the external steam supply pipeline through the sixth shut-off valve.
The dual pressure steam supply unit further comprises a desuperheater, the desuperheater is arranged between a fourth shut-off valve and the first steam inlet, and the fourth shut-off valve is connected with the first steam inlet pipeline through the desuperheater.
The desuperheater is provided with a water supply pipeline, the water supply pipeline is provided with a seventh shutoff valve, and the water supply pipeline is connected with the desuperheater pipeline through the seventh shutoff valve.
The system also comprises a condenser, a steam exhaust pipeline is arranged on the steam turbine, and the steam turbine is connected with the condenser pipeline through the steam exhaust pipeline.
The utility model discloses a flexible heat supply system of a double-pressure combined cycle unit, which comprises a waste heat boiler, a steam turbine, a double-pressure steam supply unit and an external steam supply pipeline, wherein the double-pressure steam supply unit and the steam turbine are both connected with the external steam supply pipeline, the double-pressure steam supply unit can match input high-pressure steam and low-pressure steam into medium-pressure steam and supply heat to the outside through the external steam supply pipeline, the steam turbine extracts steam through a steam extraction pipeline and inputs the extracted steam into the external steam supply pipeline to supply heat to the outside, the problem of insufficient heat supply capacity of an extraction condensing steam turbine is solved, meanwhile, the double-pressure steam supply unit matches the low-pressure steam generated by the waste heat boiler with the high-pressure steam, and the matched steam supplies heat to the outside through the external steam supply pipeline, so that the heat loss of the low-pressure steam is reduced.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. It will be apparent to those skilled in the art that the described embodiments are only a part, but not all, of the implementations of the utility model, and that all other embodiments, based on which those skilled in the art will come to lie within the scope of the utility model without making any inventive effort.
As shown in FIG. 1, the flexible heating system of the double-pressure combined cycle unit comprises a waste heat boiler 1, a steam turbine 2, a double-pressure steam supply unit and an external steam supply pipeline 9, wherein a high-pressure steam pipeline 6 and a low-pressure steam pipeline 7 are arranged on the waste heat boiler 1, the waste heat boiler 1 is connected with the steam turbine 2 through the high-pressure steam pipeline 6 and the low-pressure steam pipeline 7, the waste heat boiler 1 is also connected with the double-pressure steam supply unit through the high-pressure steam pipeline 6 and the low-pressure steam pipeline 7, and the double-pressure steam supply unit and the steam turbine 2 are both connected with the external steam supply pipeline 9.
The exhaust-heat boiler 1 in the embodiment is an exhaust-heat boiler in a gas-steam combined cycle unit, and can generate high-pressure steam and low-pressure steam, wherein the high-pressure steam enters the steam turbine 2 to do work through the high-pressure steam pipeline 6, and the low-pressure steam enters the steam turbine to do work through the low-pressure steam pipeline 6. The pressure P of the low-pressure steam is less than or equal to 2.5mPa, and the pressure 6mPa < P of the high-pressure steam is less than or equal to 14mPa.
The gas-steam combined cycle unit is a device which combines a gas turbine and a steam power device into a whole, the gas-steam combined cycle unit is arranged in a circulating system which is composed of the gas turbine, a generator, a waste heat boiler and a steam turbine, the steam turbine is a condensing steam turbine or a heat supply steam turbine, and the heat supply steam turbine is a steam extraction type or a back pressure type.
The gas-steam combined cycle unit is characterized in that high Wen Fa flue gas discharged after the gas turbine does work is recovered and converted into steam through a waste heat boiler and sent to the steam turbine for power generation.
The steam turbine 2 is provided with a high-pressure cylinder and a low-pressure cylinder, the low-pressure cylinder is provided with a first shutoff valve 12, the high-pressure cylinder is provided with a second shutoff valve 13, the low-pressure cylinder is connected with the low-pressure steam pipeline 7 through the first shutoff valve 12, and the high-pressure cylinder is connected with the high-pressure steam pipeline 6 through the second shutoff valve 13.
The steam turbine 2 is provided with a steam extraction pipeline 11, the steam extraction pipeline 11 is provided with a third shut-off valve 17, and the steam extraction pipeline 11 is connected with the external steam supply pipeline 9 through the third shut-off valve 17.
The double-pressure steam supply unit comprises a steam pressure matcher 4, a first steam inlet, a second steam inlet and a steam outlet are arranged on the steam pressure matcher 4, a fourth shut-off valve 14 is arranged on the first steam inlet, a fifth shut-off valve 15 is arranged on the second steam inlet, the first steam inlet is connected with the high-pressure steam pipeline 6 through the fourth shut-off valve 14, the second steam inlet is connected with the low-pressure steam pipeline 7 through the fifth shut-off valve 15, a sixth shut-off valve 16 is arranged on the steam outlet, and the steam outlet is connected with the external steam supply pipeline 9 through the sixth shut-off valve 16.
The steam pressure matcher generates high-speed air flow when high-pressure steam passes through the nozzle, negative pressure is generated at the outlet of the nozzle, low-pressure steam is sucked under the action of the negative pressure, medium-pressure steam is formed after the high-pressure steam and the low-pressure steam are mixed, and the purpose of pressurizing the low-pressure steam is achieved.
The dual pressure steam supply unit further comprises a desuperheater 5, the desuperheater 5 is arranged between a fourth shut-off valve 14 and the first steam inlet, and the fourth shut-off valve 14 is connected with the first steam inlet pipeline through the desuperheater 5.
The desuperheater 5 is provided with a water supply pipeline 8, the water supply pipeline 8 is provided with a seventh shutoff valve 18, and the water supply pipeline 8 is connected with the desuperheater 5 through the seventh shutoff valve 18. The desuperheater 5 uses water as a cooling medium to reduce the steam temperature, specifically, the water supplies cooling water to the desuperheater through a water supply pipeline 8 and a seventh shutoff valve 18, and the cooling water and high-pressure steam exchange heat in the desuperheater 5.
The system also comprises a condenser 3, a steam exhaust pipeline 10 is arranged on the steam turbine 2, and the steam turbine 2 is connected with the condenser 3 through the steam exhaust pipeline 10.
The condenser 3 belongs to one of heat exchangers, can convert gas or steam into liquid, and exhaust steam after the steam turbine 2 does work enters the condenser through a steam exhaust pipeline 10, and the exhaust steam exchanges heat with a cooling medium in the condenser 3 and becomes liquid.
The specific working process of the flexible heating system of the double-pressure combined cycle unit is as follows:
when the required heat supply is smaller, the fourth shut-off valve 14, the fifth shut-off valve 15, the sixth shut-off valve 16 and the seventh shut-off valve 18 are manually closed, and the first shut-off valve 12, the second shut-off valve 13 and the third shut-off valve 17 are simultaneously opened, at this time, the waste heat boiler 1 provides high-pressure steam for the steam turbine 2 through the high-pressure steam pipeline 6, meanwhile, the waste heat boiler 1 also provides low-pressure steam for the steam turbine 2 through the low-pressure steam pipeline 7, the high-pressure steam and the low-pressure steam enter the steam turbine 2 to do work, the steam extraction pipeline 11 can extract steam from the steam turbine 2, and the extracted steam supplies steam to the external steam supply pipeline 9 through the steam extraction heat supply pipeline 11 and the third shut-off valve 17, so that the external steam supply pipeline 9 supplies steam to industrial users or a heat network.
When the required heat supply is large, the third shut-off valve 17 is manually closed, the first shut-off valve 12, the second shut-off valve 13, the fourth shut-off valve 14, the fifth shut-off valve 15, the sixth shut-off valve 16 and the seventh shut-off valve 18 are opened, at this time, the waste heat boiler 1 supplies high-pressure steam to the steam turbine 2 through the high-pressure steam pipeline 6, and simultaneously the waste heat boiler 1 supplies low-pressure steam to the steam turbine 2 through the low-pressure steam pipeline 7, the high-pressure steam and the low-pressure steam enter the steam turbine 2 to do work, so that the steam turbine 2 keeps low-load operation, and because the third shut-off valve 17 is closed, steam is not extracted from the steam turbine 2 at this time, the steam consumption of the steam turbine 2 is reduced, and more steam can supply heat to the outside through the steam pressure matcher 4.
The high-pressure steam in the waste heat boiler 1 also enters the desuperheater 5 through the fourth shutoff valve 14, the temperature of the high-pressure steam is reduced after the high-pressure steam is mixed with the desuperheater 5, the cooled high-pressure steam enters the steam pressure matcher 4, the low-pressure steam in the waste heat boiler 1 also enters the steam pressure matcher 4 through the fifth shutoff valve 15, the high-pressure steam and the low-pressure steam in the steam pressure matcher 4 are mixed to form medium-pressure steam meeting the specific parameter requirements of industrial users, the medium-pressure steam supplies steam to the external steam supply pipeline 9 through the sixth shutoff valve 16, and the external steam supply pipeline 9 supplies steam to the industrial users or the heat supply network.
In extreme cases, if the required heating capacity demand is extremely large and stable, the first shut-off valve 12, the second shut-off valve 13 and the third shut-off valve 17 can be manually closed, while the fourth shut-off valve 14, the fifth shut-off valve 15, the sixth shut-off valve 16 and the seventh shut-off valve 18 are opened, at which time, since both the first shut-off valve 12 and the second shut-off valve 13 are closed, high-pressure steam and low-pressure steam in the waste heat boiler 1 are not fed to the steam turbine 2, and the steam turbine 2 is stopped, at which time all the steam in the waste heat boiler 1 is used to ensure heating.
Specifically, the high-pressure steam in the waste heat boiler 1 enters the desuperheater 5 through the fourth shutoff valve 14, the temperature of the high-pressure steam is reduced after the high-pressure steam and the desuperheater 5 are mixed, the cooled high-pressure steam enters the steam pressure matcher 4, the low-pressure steam in the waste heat boiler 1 also enters the steam pressure matcher 4 through the fifth shutoff valve 15, the high-pressure steam and the low-pressure steam in the steam pressure leather adapter 4 are mixed to form medium-pressure steam, and the medium-pressure steam supplies steam to an external steam supply pipeline through the sixth shutoff valve 16, and the external steam supply pipeline 9 supplies steam to industrial users or a heat supply network.
The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (7)
1. A flexible heating system of a double-pressure combined cycle unit is characterized in that: including exhaust-heat boiler (1), steam turbine (2), dual pressure steam supply unit and external steam supply pipeline (9), be provided with high pressure steam pipe (6) and low pressure steam pipe (7) on exhaust-heat boiler (1), exhaust-heat boiler (1) through high pressure steam pipe (6) and low pressure steam pipe (7) with steam turbine (2) pipe connection, exhaust-heat boiler (1) is still through high pressure steam pipe (6) and low pressure steam pipe (7) and dual pressure steam supply unit pipe connection, dual pressure steam supply unit and steam turbine (2) all with external steam supply pipeline (9) are connected.
2. The dual pressure combined cycle unit flexible heating system of claim 1, wherein: the steam turbine is characterized in that a high-pressure cylinder and a low-pressure cylinder are arranged on the steam turbine (2), a first shutoff valve (12) is arranged on the low-pressure cylinder, a second shutoff valve (13) is arranged on the high-pressure cylinder, the low-pressure cylinder is connected with the low-pressure steam pipeline (7) through the first shutoff valve (12), and the high-pressure cylinder is connected with the high-pressure steam pipeline (6) through the second shutoff valve (13).
3. The dual pressure combined cycle unit flexible heating system of claim 1, wherein: the steam turbine (2) is provided with a steam extraction pipeline (11), the steam extraction pipeline (11) is provided with a third shut-off valve (17), and the steam extraction pipeline (11) is connected with the external steam supply pipeline (9) through the third shut-off valve (17).
4. The dual pressure combined cycle unit flexible heating system of claim 1, wherein: the double-pressure steam supply unit comprises a steam pressure matcher (4), a first steam inlet, a second steam inlet and a steam outlet are arranged on the steam pressure matcher (4), a fourth shut-off valve (14) is arranged on the first steam inlet, a fifth shut-off valve (15) is arranged on the second steam inlet, the first steam inlet is connected with a high-pressure steam pipeline (6) through the fourth shut-off valve (14), the second steam inlet is connected with a low-pressure steam pipeline (7) through the fifth shut-off valve (15), a sixth shut-off valve (16) is arranged on the steam outlet, and the steam outlet is connected with an external steam supply pipeline (9) through the sixth shut-off valve (16).
5. A dual pressure combined cycle unit flexible heating system as claimed in claim 3, wherein: the dual-pressure steam supply unit further comprises a desuperheater (5), the desuperheater (5) is arranged between a fourth shut-off valve (14) and the first steam inlet, and the fourth shut-off valve (14) is connected with the first steam inlet through the desuperheater (5).
6. The dual pressure combined cycle unit flexible heating system of claim 5, wherein: the desuperheater (5) is provided with a water supply pipeline (8), the water supply pipeline (8) is provided with a seventh shutoff valve (18), and the water supply pipeline (8) is connected with the desuperheater (5) through the seventh shutoff valve (18) in a pipeline mode.
7. The dual pressure combined cycle unit flexible heating system of claim 1, wherein: the system also comprises a condenser (3), a steam exhaust pipeline (10) is arranged on the steam turbine (2), and the steam turbine (2) is connected with the condenser (3) through the steam exhaust pipeline (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320747282.6U CN219976369U (en) | 2023-04-07 | 2023-04-07 | Flexible heating system of double-pressure combined cycle unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320747282.6U CN219976369U (en) | 2023-04-07 | 2023-04-07 | Flexible heating system of double-pressure combined cycle unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219976369U true CN219976369U (en) | 2023-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320747282.6U Active CN219976369U (en) | 2023-04-07 | 2023-04-07 | Flexible heating system of double-pressure combined cycle unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219976369U (en) |
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- 2023-04-07 CN CN202320747282.6U patent/CN219976369U/en active Active
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