CN217152312U - System for drainage waste heat multistage utilization of low pressure heater - Google Patents
System for drainage waste heat multistage utilization of low pressure heater Download PDFInfo
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- CN217152312U CN217152312U CN202221004215.7U CN202221004215U CN217152312U CN 217152312 U CN217152312 U CN 217152312U CN 202221004215 U CN202221004215 U CN 202221004215U CN 217152312 U CN217152312 U CN 217152312U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The utility model discloses a multi-stage utilization system of the drainage waste heat of a low-pressure heater, wherein the low-pressure heater is provided with a first steam inlet pipeline, a first normal drainage pipeline and a first critical drainage pipeline, the outlet of the first critical drainage pipeline is communicated with a condenser, and the outlet of the first normal drainage pipeline is connected with a final-stage low-pressure heater; the last-stage low-pressure heater is provided with a second steam inlet pipeline, a second normal drainage pipeline and a second emergency drainage pipeline, and the second normal drainage pipeline is connected with an inlet of the low-pressure water pump through a filter screen; the outlet of the low-pressure heater is divided into two paths, wherein one path is connected with the water side inlet of the final-stage low-pressure heater through a first flow regulating valve, and the other path is connected with the hot side inlet of the heat exchanger through a second flow regulating valve; the raw water pipeline is communicated with a cold side inlet of the heat exchanger, a cold side outlet of the heat exchanger is communicated with a chemical water treatment workshop, the system can recover the drained water for preheating, and the waste heat utilization efficiency of the system is improved.
Description
Technical Field
The utility model belongs to the technical field of power plant's waste heat recovery, a hydrophobic waste heat multi-stage utilization's of low pressure feed water heater system is related to.
Background
The steam extraction heat recovery system of the large thermal generator set aims at improving the cycle thermal efficiency of the set, so that the normal operation of the steam extraction heat recovery system has a decisive influence on the improvement of the thermal economy of the set. When the unit normally operates, the drain of the high-pressure heater finally flows into the deaerator in a draining step-by-step self-flowing mode, and the drain of the low-pressure heater is converged into the condenser in a draining step-by-step self-flowing mode. Because the drain temperature of the final-stage low-pressure heater is far higher than the temperature of circulating cooling water of the condenser, a large amount of drain water of the low-pressure heater is directly discharged into the condenser, so that heat loss is caused, and adverse effects are generated on the safe operation of the condenser. Therefore, the method tries to utilize the waste heat of the drainage, and the waste heat utilization efficiency of the system is very necessary to be improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a system of the hydrophobic waste heat multi-stage utilization of low pressure feed water heater, this system can retrieve hydrophobic preheating, improves system's waste heat utilization efficiency.
In order to achieve the purpose, the system for multi-stage utilization of the drainage waste heat of the low-pressure heater comprises a raw water pipeline, a chemical water treatment workshop, a low-pressure heater steam extraction steam source, a final-stage low-pressure heater steam extraction steam source, a condenser, a low-pressure heater, a final-stage low-pressure heater, a low-pressure drainage pump, a filter screen and a heat exchanger;
the low-pressure heater is provided with a first steam inlet pipeline, a first normal drainage pipeline and a first critical drainage pipeline, wherein a steam extraction steam source of the low-pressure heater is communicated with the first steam inlet pipeline, an outlet of the first critical drainage pipeline is communicated with the condenser, and an outlet of the first normal drainage pipeline is connected with the final-stage low-pressure heater; the last-stage low-pressure heater is provided with a second steam inlet pipeline, a second normal drainage pipeline and a second emergency drainage pipeline, a steam extraction steam source of the last-stage low-pressure heater is communicated with the second steam inlet pipeline, and the second normal drainage pipeline is connected with an inlet of the low-pressure drainage pump through a filter screen;
the outlet of the low pressure heater is divided into two paths, wherein one path is connected with the water side inlet of the final-stage low pressure heater through a first flow regulating valve, the other path is connected with the hot side inlet of the heat exchanger through a second flow regulating valve, and the hot side outlet of the heat exchanger is connected with the condenser;
the raw water pipeline is communicated with a cold side inlet of the heat exchanger, and a cold side outlet of the heat exchanger is communicated with the chemical water treatment workshop.
The outlet of the second critical drain pipeline is connected with the condenser.
And the second flow regulating valve is connected with the hot side inlet of the heat exchanger through a first electric valve.
And the hot side outlet of the heat exchanger is connected with the condenser through a second electric valve.
Also includes a bypass conduit; one end of the bypass pipeline is communicated with a pipeline between the second flow regulating valve and the first electric valve, and the other end of the bypass pipeline is communicated with a pipeline between the second electric valve and the condenser.
The bypass pipeline is provided with a bypass electric valve.
And a normal drainage regulating valve is arranged on the first normal drainage pipeline.
The first emergency drain pipeline is provided with a first emergency drain regulating valve.
And a second emergency drain regulating valve is arranged on the second emergency drain pipeline.
The utility model discloses following beneficial effect has:
hydrophobic waste heat multistage utilization's of low pressure heater system when concrete operation, utilize to add the hydrophobic pump of low pressure heater with the hydrophobic water side of carrying to final stage low pressure heater of a part to the realization is to hydrophobic recycle, improves the temperature of condensate water simultaneously, the hydrophobic heat of another part then heats raw water through the heat exchanger, in order to realize the hydrophobic multistage utilization of low pressure heater, improves the waste heat utilization ratio of power plant, reduces the coal consumption, improves the economic nature and the feature of environmental protection of unit.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a low-pressure heater, 2 is a final-stage low-pressure heater, 3 is a first critical drain regulating valve, 4 is a normal drain regulating valve, 5 is a second critical drain regulating valve, 6 is a filter screen, 7 is a low pressure drain pump, 8 is a first flow regulating valve, 9 is a second flow regulating valve, 10 is a heat exchanger, 11 is a first electric valve, 12 is a second electric valve, 13 is a bypass electric valve, 14 is a low-pressure heater steam extraction source, 15 is a final-stage low-pressure heater steam extraction source, 16 is a condenser, 17 is a raw water pipeline, and 18 is a chemical water treatment workshop.
Detailed Description
In order to make the technical solution of the present invention better understood, the following figures in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments, and do not limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
A schematic structural diagram according to an embodiment of the present disclosure is shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the system for multi-stage utilization of the drain waste heat of the low pressure heater of the present invention includes a low pressure heater 1, a final stage low pressure heater 2, a low pressure drain pump 7 and a heat exchanger 10;
the low-pressure heater 1 is provided with a first steam inlet pipeline, a first normal drainage pipeline and a first emergency drainage pipeline, wherein a steam extraction source 14 of the low-pressure heater is communicated with the first steam inlet pipeline, a first emergency drainage regulating valve 3 is arranged on the first emergency drainage pipeline, and an outlet of the first emergency drainage pipeline is communicated with a condenser 16, so that emergency drainage enters the condenser 16; and a normal drainage regulating valve 4 is arranged on the first normal drainage pipeline, and an outlet of the first normal drainage pipeline is connected with the final-stage low-pressure heater 2.
The final-stage low-pressure heater 2 is provided with a second steam inlet pipeline, a second normal drainage pipeline and a second emergency drainage pipeline, a steam extraction steam source 15 of the final-stage low-pressure heater is communicated with the second steam inlet pipeline, a second emergency drainage regulating valve 5 is arranged on the second emergency drainage pipeline, and an outlet of the second emergency drainage pipeline is connected with the condenser 16, so that emergency drainage enters the condenser 16; the second normal drainage pipeline is connected with the inlet of a low pressure drainage pump 7 through a filter screen 6.
The outlet of the low-pressure water-adding drainage pump 7 is divided into two paths, wherein one path is connected with the water side inlet of the final-stage low-pressure heater 2 through a first flow regulating valve 8, the other path is connected with the hot side inlet of a heat exchanger 10 through a second flow regulating valve 9 and a first electric valve 11, the hot side outlet of the heat exchanger 10 is connected with a condenser 16 through a second electric valve 12, one end of a bypass pipeline is communicated with a pipeline between the second flow regulating valve 9 and the first electric valve 11, the other end of the bypass pipeline is communicated with a pipeline between the second electric valve 12 and the condenser 16, and a bypass electric valve 13 is arranged on the bypass pipeline.
The raw water pipe 17 is communicated with a cold side inlet of the heat exchanger 10, and a cold side outlet of the heat exchanger 10 is communicated with a chemical water treatment plant 18.
The utility model discloses a concrete working process does:
when the steam extraction heat recovery system is ready to be put into operation, the first emergency drain control valve 3 and the second emergency drain control valve 5 are opened, the normal drain control valve 4 is closed, and drain water of all levels of heaters is discharged to the condenser 16.
And when the temperature rise value of the water side of each heater is stable, the drainage sample is tested, and after the drainage quality is qualified, the first critical drainage regulating valve 3 and the second critical drainage regulating valve 5 are closed, the normal drainage regulating valve 4 is opened, and the drainage is recovered. And meanwhile, the low pressure drainage pump 7 is started, the first flow regulating valve 8, the second flow regulating valve 9 and the opening degrees of the first flow regulating valve 8 and the second flow regulating valve 9 are regulated, and the water level of the low pressure heater 1 is ensured to be in a normal operation range. The first electric valve 11 and the second electric valve 12 are opened, the bypass electric valve 13 is closed, the heat exchanger 10 is put into use, and the heat drained by the low-pressure heater 1 is transferred to the raw water.
When the heat exchanger 10 breaks down, the first electric valve 11 and the second electric valve 12 are closed, the bypass electric valve 13 is opened, the heat exchanger 10 is isolated, and the safe and stable operation of the whole system is ensured.
The utility model is suitable for a thermal generator set, but not only be limited to these units. All the above description sets forth the basic principles, the main features and the advantages of the present invention. The present invention is not limited by the above embodiments, and the above embodiments and the description are only illustrative of the principles of the present invention. The utility model discloses there are various changes and improvements in can being based on actual design work progress, and these change all belong to with the improvement the utility model discloses in the scope of claiming.
Claims (9)
1. The system for multi-stage utilization of the drainage waste heat of the low-pressure heater is characterized by comprising a low-pressure heater (1), a final-stage low-pressure heater (2), a filter screen (6), a low-pressure drainage pump (7), a heat exchanger (10), a low-pressure heater steam extraction source (14), a final-stage low-pressure heater steam extraction source (15), a condenser (16), a raw water pipeline (17) and a chemical water treatment plant (18);
the low-pressure heater (1) is provided with a first steam inlet pipeline, a first normal drainage pipeline and a first critical drainage pipeline, wherein a steam extraction source (14) of the low-pressure heater is communicated with the first steam inlet pipeline, an outlet of the first critical drainage pipeline is communicated with a condenser (16), and an outlet of the first normal drainage pipeline is connected with the last-stage low-pressure heater (2); the last-stage low-pressure heater (2) is provided with a second steam inlet pipeline, a second normal drainage pipeline and a second emergency drainage pipeline, a steam extraction steam source (15) of the last-stage low-pressure heater is communicated with the second steam inlet pipeline, and the second normal drainage pipeline is connected with an inlet of the low-pressure drainage pump (7) through a filter screen (6);
the outlet of the low pressure heater (7) is divided into two paths, wherein one path is connected with the water side inlet of the final-stage low pressure heater (2) through a first flow regulating valve (8), the other path is connected with the hot side inlet of a heat exchanger (10) through a second flow regulating valve (9), and the hot side outlet of the heat exchanger (10) is connected with a condenser (16);
the raw water pipeline (17) is communicated with a cold side inlet of the heat exchanger (10), and a cold side outlet of the heat exchanger (10) is communicated with a chemical water treatment workshop (18).
2. The system for multi-stage utilization of waste heat of the low-pressure heater is characterized in that an outlet of the second critical drain pipeline is connected with a condenser (16).
3. The system for multi-stage utilization of the waste heat of the drain of the low-pressure heater as claimed in claim 1, characterized in that the second flow regulating valve (9) is connected with the hot side inlet of the heat exchanger (10) through a first electric valve (11).
4. The system for multi-stage utilization of the waste heat of the drain water of the low-pressure heater as claimed in claim 3, characterized in that the hot side outlet of the heat exchanger (10) is connected with the condenser (16) through a second electric valve (12).
5. The system for multi-stage utilization of the waste heat of the drain of the low-pressure heater according to claim 4, further comprising a bypass pipeline; one end of the bypass pipeline is communicated with a pipeline between the second flow regulating valve (9) and the first electric valve (11), and the other end of the bypass pipeline is communicated with a pipeline between the second electric valve (12) and the condenser (16).
6. The system for the multi-stage utilization of the waste heat of the low-pressure heater is characterized in that a bypass electric valve (13) is arranged on the bypass pipeline.
7. The system for multi-stage utilization of the waste heat of the low-pressure heater is characterized in that a normal drain regulating valve (4) is arranged on the first normal drain pipeline.
8. The system for multi-stage utilization of waste heat of the low-pressure heater is characterized in that a first emergency drain adjusting valve (3) is arranged on a first emergency drain pipeline.
9. The system for multi-stage utilization of waste heat of the low-pressure heater is characterized in that a second emergency drain adjusting valve (5) is arranged on the second emergency drain pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221004215.7U CN217152312U (en) | 2022-04-27 | 2022-04-27 | System for drainage waste heat multistage utilization of low pressure heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221004215.7U CN217152312U (en) | 2022-04-27 | 2022-04-27 | System for drainage waste heat multistage utilization of low pressure heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217152312U true CN217152312U (en) | 2022-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221004215.7U Active CN217152312U (en) | 2022-04-27 | 2022-04-27 | System for drainage waste heat multistage utilization of low pressure heater |
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| Country | Link |
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| CN (1) | CN217152312U (en) |
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2022
- 2022-04-27 CN CN202221004215.7U patent/CN217152312U/en active Active
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