CN210740371U - Double-machine backheating drainage system based on small bypass of high-pressure heater - Google Patents
Double-machine backheating drainage system based on small bypass of high-pressure heater Download PDFInfo
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- CN210740371U CN210740371U CN201921651319.5U CN201921651319U CN210740371U CN 210740371 U CN210740371 U CN 210740371U CN 201921651319 U CN201921651319 U CN 201921651319U CN 210740371 U CN210740371 U CN 210740371U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 96
- 230000001172 regenerating effect Effects 0.000 claims abstract description 33
- 238000000605 extraction Methods 0.000 claims description 20
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000002209 hydrophobic effect Effects 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a duplex backheating drainage system based on little bypass of high pressure feed water heater, this duplex backheating drainage system belong to the drainage system field. The double-motor regenerative drainage system based on the small bypass of the high-pressure heater is characterized in that a bypass drainage pipeline is additionally arranged between a drainage pipeline between any two high-pressure heaters and a deaerator on the traditional double-motor regenerative drainage system. The utility model discloses an unstable operating mode of system that the part high pressure heater that the part that probably appears in the course of the work of solving traditional duplex backheat drainage system breaks down and arouses. When part of the high-pressure heaters are withdrawn, the drained water of the rest high-pressure heaters can be conveyed to the deaerator through the override drain pipeline, so that the system is more energy-saving than a system without the override drain.
Description
Technical Field
The utility model relates to a drainage system field especially relates to a duplex backheating drainage system.
Background
With the continuous improvement of the high-temperature performance of the material, the steam parameters of the coal-fired generator set are continuously improved so as to obtain higher cycle efficiency, further reduce the coal consumption of the generator set and reduce the emission of greenhouse gases and other pollutants. Improving steam parameters is one of the most direct ways to improve the cycle efficiency of the power generation system. However, with the improvement of steam parameters, the superheat degree of the regenerative extraction steam is increased, the irreversible loss of heat exchange between the steam side and the water side in the regenerative heater is increased, the gain caused by the increase of the steam parameters is reduced, and the contradiction is more prominent when the steam parameters are higher.
For the problem, the conventional solution at present is to add an external steam cooler to part of the regenerative extraction steam to reduce the superheat degree of the regenerative extraction steam. The other method is to adopt a special thermodynamic system structure, namely a double-machine regenerative system, and the method can greatly reduce the heat exchange superheat degree of regenerative steam extraction after reheating and can greatly improve the utilization efficiency of the regenerative steam extraction energy level. At present, a high-pressure heater of a large-capacity thermal power plant normally drains water, generally adopts a step-by-step self-flow mode, and finally enters a deaerator; draining the accident water into a drainage flash tank and then entering a condenser. For part of the double-machine regenerative system, the step-by-step self-flow mode is adopted, and the following problems exist:
1. after part of the high-pressure heaters are withdrawn, the rest high-pressure heaters still operate, and drain water enters the drain flash tank. Due to the characteristics of the double-machine regenerative system, the high-pressure heater has large steam extraction amount, large drainage amount, large volume of the drainage flash tank, high manufacturing cost and difficult field equipment arrangement.
2. The double-machine heat recovery system has low steam extraction temperature, and is heated to the same water supply temperature relative to a non-double-machine heat recovery system, the steam extraction amount is large, the water drainage amount of the high-pressure heater is large, and the ratio of the heat carried into the deaerator by the drainage of the high-pressure heater to the total heat entering the deaerator is far larger than that of the non-double-machine heat recovery system. After part of the high-pressure heaters are withdrawn, no high-pressure heater of the deaerator is drained to enter, the steam extraction amount entering the deaerator is greatly increased, and the deaerator and a steam extraction pipeline thereof can vibrate; the upper blade of the steam extraction port of the deaerator of the regenerative small steam turbine can be overloaded, so that the safety of equipment is threatened, and the load of a unit is compelled to be reduced.
3. The particularity of the double-machine regenerative system is that a small bypass of a high-pressure heater is adopted. After part of the high-pressure heaters are withdrawn, the upstream high-pressure heater continues to operate, and the drained water enters the drainage flash tank, so that energy loss is caused.
SUMMERY OF THE UTILITY MODEL
After withdrawing from work in order to solve partial high pressure feed water heater trouble, the condition that probably takes place under the operating mode of surplus high pressure feed water heater still, for example partial high pressure feed water heater withdraws from work after, the hydrophobic unable normal deaerator that arranges of accident, the utility model provides a method can directly carry the hydrophobic direct deaerator of accident to through addding more hydrophobic pipeline, stabilizes the steam extraction volume of deaerator, makes the system operation safer.
In view of the above circumstances, the utility model provides a two-motor backheating drainage system based on little bypass of high pressure feed water heater, including two-motor backheating drainage system, be connected with the hydrophobic pipeline of overgrade between two arbitrary high pressure feed water heater in the hydrophobic system of backheating and the oxygen-eliminating device between hydrophobic pipeline and the oxygen-eliminating device. The added override drain pipeline can convey drain to the deaerator through the override drain pipeline when part of the drain is high-pressure-fed and withdrawn, so that the stability of the system is improved, and heat is recovered.
Preferably, the double-machine regenerative drainage system comprises a water feeding pump, a speed regulating device, a regenerative small steam turbine, a power balance generator, a first steam pipeline, a boiler, a plurality of high-pressure heaters, a deaerator, an ultrahigh pressure cylinder, a second steam pipeline and a water feeding pipeline, wherein the water feeding pipeline comprises a first water feeding pipeline, a second water feeding pipeline and a third water feeding pipeline;
the water outlet of the deaerator is connected with the water inlet of the water feeding pump, the water outlet of the water feeding pump is sequentially connected with a plurality of high-pressure heaters through a first water feeding pipeline, and the water outlet of the high-pressure heater positioned at the tail end is connected to the boiler through a third water feeding pipeline along the flowing direction of water feeding.
The regenerative small steam turbine is connected with the water feeding pump through a speed regulating device and is also connected with the power balance generator; the heat recovery type small steam turbine is respectively connected with a steam inlet of the high-pressure heater and a steam inlet of the deaerator except the high-pressure heater at the tail end through a first steam pipeline;
the high-pressure heaters are sequentially connected with the drainage inlets of the adjacent upstream high-pressure heaters from the high-pressure heater at the tail end through a drainage pipeline; the drainage outlet of the high-pressure heater at the initial end is connected with a deaerator.
Preferably, each high-pressure heater or every two adjacent high-pressure heaters form a group, a bypass water supply pipeline is connected between the water supply pipeline positioned at the adjacent upstream of each group of high-pressure heaters and the water supply pipeline positioned at the adjacent downstream, when part of the high-pressure heaters break down and quit working, the water supply flows from the upstream water supply pipeline to the downstream water supply pipeline through the bypass water supply pipeline, and the instability of the whole double-machine regenerative drainage system caused by the quit of part of the high-pressure heaters is avoided.
Preferably, the drain pipeline is connected with a drain flash tank through a drain flash pipe, and when part of the high-pressure heaters fail and quit working, drain of the downstream high-pressure heater flows to the drain flash tank through the drain flash pipe.
Preferably, the stepped drain pipeline is provided with a first shut-off valve, a stepped drain regulating valve and a second shut-off valve in sequence along the flow direction of the fluid, so as to regulate the flow speed of the drain.
Preferably, the bypass water supply line is connected with the water supply line through a three-way valve.
Preferably, the first steam pipeline, the second steam pipeline, the drain pipeline and the drain flash pipe are all provided with regulating valves.
Compared with the prior art, the utility model discloses following beneficial effect has:
when the drainage flash tank is designed, the working condition that part of the high-pressure heater exits and the drainage of the downstream high-pressure heater enters the drainage flash tank can be omitted, and the drainage flash tank is small in size, low in cost and convenient to control on site.
After part of the high-pressure heaters exit, the drainage of the downstream high-pressure heater enters the deaerator, the reduction range of the heat brought into the deaerator by the drainage of the high-pressure heater is smaller than that of a system without increasing the override drainage, the extraction steam entering the deaerator cannot be greatly increased, and the backheating type small steam turbine, the deaerator and the system thereof can be safer.
After part of the high-pressure heaters are withdrawn, the rest high-pressure heaters drain water and enter the deaerator, so that heat can be recovered, and the system is more energy-saving than a system without increasing the override drain water.
Drawings
FIG. 1 is a schematic diagram of a dual-machine regenerative drainage system based on a small heater bypass.
In the figure, 1 is a drainage expansion pipe, 2 is a speed regulating device, 3 is a regenerative small steam turbine, 4 is a power balance generator, 5 is a first steam pipeline, 6 is a boiler, 7 is a high-pressure heater, 8 is a regulating valve, 9 is a deaerator, 10 is a water feed pump, 11 is an override drainage pipeline, 12 is a second shut-off valve, 13 is an override drainage regulating valve, 14 is a first shut-off valve, 15 is an ultra-high pressure cylinder, 16 is a three-way valve, 17 is a bypass water feed pipeline, 18 is a third water feed pipeline, 19 is a first water feed pipeline, 20 is a drainage pipeline, 21 is a second water feed pipeline, 22 is a drainage expansion tank, and 23 is a second steam pipeline.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further described with reference to the following embodiments.
As shown in fig. 1, the double-machine regenerative drainage system based on the small bypass of the high-pressure heater comprises six high-pressure heaters 7, a first high-pressure heater 7, a second high-pressure heater 7, a third high-pressure heater 7, a fourth high-pressure heater 7, a fifth high-pressure heater 7, a sixth high-pressure heater 7, a water feed pump 10, a speed regulating device 2, a regenerative small steam turbine 3, a power balance generator 4, a first steam pipeline 5, a boiler 6, a deaerator 9, an ultra-high pressure cylinder 15, a second steam pipeline 23 and water feed pipelines in sequence from left to right, wherein the water feed pipelines comprise a first water feed pipeline 19, a second water feed pipeline 21 and a third water feed pipeline 18.
Because the deaerator 9 is a mixed heating device, a water pump is needed to increase the pressure to enter the boiler, the water outlet of the deaerator 9 is connected with the water inlet of the water feed pump 10, the water outlet of the water feed pump 10 is sequentially connected with the six high-pressure heaters 7 to the first high-pressure heater 7 through the first water feed pipeline 19, finally, the water outlet of the first high-pressure heater 7 is connected to the boiler 6 through the third water feed pipeline 18, and meanwhile, the first high-pressure heater 7 is connected with the steam extraction port of the ultrahigh-pressure cylinder 15 through the second steam pipeline 23.
The backheating type small steam turbine 3 is connected with a water feeding pump 10 through a speed regulating device 2 and is also connected with a power balance generator 4, and the backheating type small steam turbine 3 respectively conveys steam to a second high-pressure heater 7, a sixth high-pressure heater 7 and a deaerator 9 for heat exchange through a first steam pipeline 5.
From the first high-pressure heater 7, the drainage outlet of each high-pressure heater 7 is connected with the drainage inlet of the adjacent upstream high-pressure heater 7 through a drainage pipeline 20 in sequence, and the drainage outlet of the sixth high-pressure heater 7 is connected with the deaerator 9 through the drainage pipeline 20.
In this embodiment, the first high pressure heater 7 and the second high pressure heater 7 are a first group, the third high pressure heater 7 and the fourth high pressure heater 7 are a second group, the fifth high pressure heater 7 and the sixth high pressure heater 7 are a third group, a bypass water supply pipeline 17 is connected between an upstream water supply pipeline adjacent to each group of high pressure heaters 7 and a downstream water supply pipeline adjacent to each other, when part of the high pressure heaters 7 break down and exit, the feed water is conveyed to the next group of high pressure heaters 7 through the bypass water supply pipeline 17 for heat exchange, and a three-way valve 16 is installed at the joint of the bypass water supply pipeline 17 and the water supply pipeline.
Each drain pipeline 20 is provided with a drain flash pipe 1 connected to a drain flash tank 22, and when the upper high-pressure heater 7 fails and the drain cannot be conveyed to the upper high-pressure heater 7, the drain flows to the drain flash tank 22.
In this embodiment, on the drain line 20 that No. two high pressure feed water heaters 7 and No. three high pressure feed water heaters 7 are connected respectively, be equipped with overgrade drain line 11 on the drain line 20 that No. four high pressure feed water heaters 7 and No. five high pressure feed water heaters 7 are connected and directly be connected with deaerator 9, when certain group high pressure feed water heaters 7 broke down, the drainage of surplus high pressure feed water heaters 7 is carried to deaerator 9 through overgrade drain line 11, can stabilize the steam extraction capacity of deaerator 9, deaerator 9 and the steam extraction pipeline vibration have been avoided, also can avoid backheat type little steam turbine 3 and deaerator 9 steam extraction mouth one-level blade overload simultaneously, the security of equipment has been improved, the unit area load ability obtains improving.
A first stop valve 14, a stepped drain regulating valve 13 and a second stop valve 12 are sequentially arranged on the stepped drain pipeline 11 along the flow direction of drain water, and are used for controlling the using state of the stepped drain pipeline.
In addition, regulating valves 8 are arranged on a first steam pipeline 5 connected with the regenerative small steam turbine 3, the high-pressure heater 7 and the deaerator 9, a second steam pipeline 23 connected with the ultrahigh-pressure cylinder 15 and the first high-pressure heater 7, a drain pipeline 20 and a drain expansion pipe 1, and are used for regulating the steam extraction speed or the drain flow speed of steam.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a duplex backheating drainage system based on little bypass of high pressure feed water heater, includes duplex backheating drainage system, its characterized in that: a bypass drain pipeline (11) is connected between a drain pipeline (20) between any two high-pressure heaters (7) in the double-machine regenerative drain system and the deaerator.
2. The double-motor regenerative drainage system based on the high-pressure heater small bypass according to claim 1, characterized in that: the double-machine regenerative drainage system comprises a water feeding pump (10), a speed regulating device (2), a regenerative small steam turbine (3), a power balance generator (4), a first steam pipeline (5), a boiler (6), a plurality of high-pressure heaters (7), a deaerator (9), an ultra-high pressure cylinder (15), a second steam pipeline (23) and a water feeding pipeline, wherein the water feeding pipeline comprises a first water feeding pipeline (19), a second water feeding pipeline (21) and a third water feeding pipeline (18);
the steam extraction port of the deaerator (9) is connected with the water inlet of the water feeding pump (10), and the water outlet of the water feeding pump (10) is sequentially connected with a plurality of high-pressure heaters (7) through a first water feeding pipeline (19) along the flowing direction of water feeding; the high-pressure heater (7) positioned at the tail end is connected to the boiler (6) through a third water supply pipeline (18) and is connected with a steam extraction port of the ultrahigh-pressure cylinder (15) through a second steam pipeline (23);
the small regenerative steam turbine (3) is connected with a water feeding pump (10) through a speed regulating device (2), and the small regenerative steam turbine (3) is also connected with a power balance generator (4); the heat recovery type small steam turbine (3) is respectively connected with a steam inlet of the high-pressure heater (7) except the high-pressure heater (7) at the tail end and a steam inlet of the deaerator (9) through a first steam pipeline (5);
the high-pressure heaters (7) are sequentially connected with the drainage inlets of the adjacent upstream high-pressure heaters (7) from the high-pressure heater (7) positioned at the tail end through drainage pipelines; the drainage outlet of the high-pressure heater (7) at the initial end is connected with a deaerator (9).
3. The double-motor regenerative drainage system based on the high-pressure heater small bypass according to claim 1, characterized in that: each high-pressure heater (7) or every two adjacent high-pressure heaters (7) form a group, and a bypass water supply pipeline (17) is connected between the water supply pipeline at the adjacent upstream and the water supply pipeline at the adjacent downstream of each group of high-pressure heaters (7).
4. The double-motor regenerative drainage system based on the high-pressure heater small bypass according to claim 2, characterized in that: each drainage pipeline (20) is provided with a drainage flash pipe (1) connected to a drainage flash tank (22).
5. The double-motor regenerative drainage system based on the high-pressure heater small bypass according to claim 1, characterized in that: and a first shut-off valve (14), a stepped hydrophobic regulating valve (13) and a second shut-off valve (12) are sequentially arranged on the stepped hydrophobic pipeline (11) along the flowing direction of the fluid.
6. The double-motor regenerative drainage system based on the high-pressure heater small bypass according to claim 3, characterized in that: the bypass water supply pipeline (17) is connected with the water supply pipeline through a three-way valve (16).
7. The double-motor regenerative drainage system based on the high-pressure heater small bypass according to claim 4, characterized in that: and the first steam pipeline (5), the second steam pipeline (23), the drain pipeline (20) and the drain expansion pipe (1) are all provided with regulating valves (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921651319.5U CN210740371U (en) | 2019-09-29 | 2019-09-29 | Double-machine backheating drainage system based on small bypass of high-pressure heater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921651319.5U CN210740371U (en) | 2019-09-29 | 2019-09-29 | Double-machine backheating drainage system based on small bypass of high-pressure heater |
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| CN210740371U true CN210740371U (en) | 2020-06-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529838A (en) * | 2019-09-29 | 2019-12-03 | 大唐郓城发电有限公司 | A kind of two-shipper backheat draining system based on the small bypass of high-pressure heater |
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2019
- 2019-09-29 CN CN201921651319.5U patent/CN210740371U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529838A (en) * | 2019-09-29 | 2019-12-03 | 大唐郓城发电有限公司 | A kind of two-shipper backheat draining system based on the small bypass of high-pressure heater |
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Granted publication date: 20200612 Termination date: 20210929 |