CN216521613U - Water supply heating system - Google Patents
Water supply heating system Download PDFInfo
- Publication number
- CN216521613U CN216521613U CN202220103783.6U CN202220103783U CN216521613U CN 216521613 U CN216521613 U CN 216521613U CN 202220103783 U CN202220103783 U CN 202220103783U CN 216521613 U CN216521613 U CN 216521613U
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- inlet
- heater
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- outlet
- valve group
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- 238000000605 extraction Methods 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000008236 heating water Substances 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 2
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The utility model discloses a feedwater heating system, which comprises a steam source, a superheater, a first valve group, a steam turbine steam extraction pipeline, a second valve group, a heater and a drain pipe, wherein an outlet of the steam source is connected with an inlet of the superheater, an outlet of the superheater is connected with an inlet of the first valve group, an outlet of the steam turbine steam extraction pipeline is connected with an inlet of the second valve group, an outlet of the first valve group and an outlet of the second valve group are mixed into a strand and connected with a first inlet of the heater, and a first outlet of the heater is connected with an inlet of the drain pipe. After the steam turbine and the reactor are tripped, the system can heat the feed water at the inlet of the evaporator to the temperature close to the temperature of the inlet of the evaporator, the feed water is supplied to the evaporator, the unit can be started again without long-time cooling, the quick start of the unit in a thermal state is facilitated, the usability of the unit is improved, and the economy of the unit is improved.
Description
Technical Field
The utility model belongs to the technical field of electric power, and particularly relates to a water heating system.
Background
At present, a steam source of a high-pressure heater of a thermal power generating unit generally comes from a steam turbine to extract steam, the steam turbine cannot extract steam before a unit is not connected to a grid, the unit is heated by only depending on a deaerator, the outlet water supply temperature of the deaerator is limited to be increased, when the unit is started in a thermal state, the water supply temperature cannot meet the requirement of the water supply temperature of a boiler (evaporator), the boiler (evaporator) is forced to be subjected to thermal shock by water supply, a long time is needed for waiting for the boiler (evaporator) to be cooled down, and the availability of the unit is reduced.
When the steam turbine is stopped under the working condition of shutdown and non-shutdown operation, all the extracted steam is lost, all the steam sources of the high-pressure heater, the low-pressure heater and the deaerator are lost, the water supply temperature at the inlet of the evaporator is sharply reduced, and the safety of the evaporator is influenced;
after the steam turbine and the reactor are tripped, the water supply temperature at the inlet of the evaporator is difficult to increase to a temperature close to the water supply pipe plate at the inlet of the evaporator, the unit needs to be cooled for a long time (the cooling time is more than 170 hours) until the water supply temperature at the inlet of the evaporator is close to the temperature of the water supply pipe plate at the inlet of the evaporator, the water can be supplied to the evaporator again, the unit can be started, the availability of the unit is reduced, and the benefit of the unit is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a feedwater heating system aiming at the problems of feedwater system heating.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
a feedwater heating system comprises a steam source, a superheater, a first valve group, a steam extraction pipeline of a steam turbine, a second valve group, a heater and a drain pipe; wherein,
the outlet of the steam source is connected with the inlet of the superheater, the outlet of the superheater is connected with the inlet of the first valve group, the outlet of the steam extraction pipeline of the steam turbine is connected with the inlet of the second valve group, the outlet of the first valve group and the outlet of the second valve group are mixed to form a branch which is connected with the first inlet of the heater, and the first outlet of the heater is connected with the inlet of the drain pipe.
In a further development of the utility model, the first valve group comprises a non-return valve and a regulating valve.
In a further development of the utility model, the second valve group comprises a non-return valve and a regulating valve.
The utility model is further improved in that the heater is a shell and tube heat exchanger with water on the tube side and steam for heating the water on the shell side.
The utility model is further improved in that the superheater is a surface heater, and the heating heat of the superheater comes from electric current, gas or coal.
The utility model is further improved in that the steam source is on-line steam supply or local starting steam.
The utility model is further improved in that when the temperature of the steam supplied by the on-line steam supply or the steam started by the on-line steam supply can not meet the temperature requirement of the steam source heated by the heater, the steam is heated by the superheater to meet the requirement.
The utility model is further improved in that the device also comprises a heater inlet water supply pipeline and a heater outlet pipeline; the outlet of the water supply pipeline at the inlet of the heater is connected with the second inlet of the heater, and the second outlet of the heater is connected with the inlet of the outlet pipeline of the heater.
Compared with the prior art, the utility model has the following advantages:
the utility model provides a system for heating water, which has the following obvious advantages compared with the system generally used at present:
when the unit extraction steam is unavailable, a steam source is provided for unit water supply heating, the unit water supply can be heated to the required temperature, and the safe operation of the unit is facilitated.
When the steam turbine is tripped and the steam extraction of the steam turbine is lost, the system is put into use, the temperature of the inlet of the evaporator cannot fluctuate violently, and the safety of unit operation is improved.
After the steam turbine and the reactor are tripped, the system can heat the feed water at the inlet of the evaporator to the temperature close to the temperature of the inlet of the evaporator, the feed water is supplied to the evaporator, the unit can be started again without long-time cooling, the quick start of the unit in a hot state is facilitated, the usability of the unit is improved, and the economy of the unit is improved.
Drawings
Fig. 1 is a block diagram of a system for heating water according to the present invention.
Description of reference numerals:
1. the system comprises a steam source, 2, a superheater, 3, a first valve group, 4, a heater, 5, a drain pipe, 6, a heater inlet water supply pipeline, 7, a heater outlet pipeline, 8, a steam turbine steam extraction pipeline, 9 and a second valve group.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the feedwater heating system provided by the present invention includes a steam source 1, a superheater 2, a first valve group 3, a steam turbine extraction pipeline 8, a second valve group 9, a heater 4, a steam trap 5, a heater inlet feedwater pipeline 6, and a heater outlet pipeline 7.
The outlet of the steam source 1 is connected with the inlet of the superheater 2, the outlet of the superheater 2 is connected with the inlet of the first valve group 3, the outlet of the steam extraction pipeline 8 of the steam turbine is connected with the inlet of the second valve group 9, the outlet of the first valve group 3 and the outlet of the second valve group 9 are mixed to form a flow which is connected with the first inlet of the heater 4, and the first outlet of the heater 4 is connected with the inlet of the drain pipe 5. The outlet of the heater inlet feed water pipe 6 is connected with the second inlet of the heater 4, and the second outlet of the heater 4 is connected with the inlet of the heater outlet pipe 7.
Wherein, the first valve group 3 and the second valve group 9 both comprise a check valve and a regulating valve.
The heater 4 is a shell-and-tube heat exchanger, water is arranged on the tube side, and steam for heating water is arranged on the shell side.
The superheater 2 is a surface heater, and the heating heat of the superheater 2 comes from current, gas or coal.
The steam source 1 is on-machine steam supply or local starting steam. When the temperature of the steam supplied by the machine or the steam started by the machine cannot meet the temperature requirement of the steam source heated by the heater 4, the steam is heated by the superheater 2 to meet the requirement.
The utility model provides a water heating system, wherein when the system works, the starting process of a unit comprises the following steps:
before the unit is not connected to the grid, steam is provided by a steam source 1, is heated to a required temperature in a superheater 2, and enters the shell side of a heater 4 through a first valve group 3;
the feed water entering the heater 4 from the heater inlet feed water pipe 6 is absorbed in the heat exchanger 4 and then enters the heater outlet pipe 7;
the steam entering the shell side of the heater 4 forms condensed water after absorbing heat and enters the drain pipe 5;
after the unit is connected to the power grid, along with the rising of the steam pressure in the steam extraction pipeline 8 of the steam turbine, the regulating valve in the first valve group 3 is gradually closed, the regulating valve in the second valve group 9 is opened, the steam on the shell side of the heater 4 is gradually switched into the steam in the steam extraction pipeline 8 of the steam turbine from the steam of the steam source 1, and the stable water supply temperature is noticed in the switching process.
Examples
The feedwater heating of the high-temperature gas cooled reactor demonstration engineering evaporator can be realized only by a deaerator before the unit is not connected to the grid, and the feedwater temperature can be only heated to 105 ℃ in the starting stage of the unit. The high pressure reactor can be put into operation only when the power of the reactor reaches about 45 percent, before the high pressure reactor is put into operation, the temperature of the primary side inlet of the evaporator is increased to 750 ℃ from 105 ℃, the temperature of the outlet is increased to 250 ℃ from 105 ℃, the temperature of the secondary side outlet steam of the evaporator is increased to 560 ℃ from 105 ℃, the temperature of the secondary side inlet of the evaporator is always about 105 ℃, and the temperature difference among the parts of the evaporator is large, so that the safe operation of the evaporator is not facilitated. After the method is adopted, the temperature of the secondary side inlet of the evaporator can be correspondingly increased along with the increase of the temperature of the primary side, the temperature difference of the operation of the evaporator is reduced, and the safe operation of a unit is facilitated.
When the steam turbine is tripped and the steam extraction of the steam turbine is lost, the system is put into use, the inlet temperature of the evaporator can be heated to be closer to the temperature of the unit during operation, the water supply temperature cannot fluctuate violently, and the safety of the unit during operation is improved.
After the steam turbine and the reactor are tripped, the system can heat the feed water at the inlet of the evaporator to the temperature close to the temperature of the inlet of the evaporator, supply water to the evaporator, and establish the circulation of the two loops within 15 hours, so that the unit can be restarted without long-time cooling, the quick starting of the unit in a hot state is facilitated, the usability of the unit is improved, and the economy of the unit is improved.
Although the utility model has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.
Claims (8)
1. A feedwater heating system is characterized by comprising a steam source (1), a superheater (2), a first valve group (3), a steam turbine extraction pipeline (8), a second valve group (9), a heater (4) and a drain pipe (5); wherein,
the outlet of the steam source (1) is connected with the inlet of the superheater (2), the outlet of the superheater (2) is connected with the inlet of the first valve group (3), the outlet of a steam extraction pipeline (8) of the steam turbine is connected with the inlet of the second valve group (9), the outlet of the first valve group (3) and the outlet of the second valve group (9) are mixed to form a mixture, the mixture is connected with the first inlet of the heater (4), and the first outlet of the heater (4) is connected with the inlet of the drain pipe (5).
2. A system for heating up feedwater according to claim 1, characterized in that the first valve group (3) comprises a non-return valve and a regulating valve.
3. A system for heating water as claimed in claim 1, characterized in that the second set of valves (9) comprises a non-return valve and a regulating valve.
4. A system for heating feedwater as claimed in claim 1 wherein the heater (4) is a shell and tube heat exchanger with water on the tube side and steam for heating the water on the shell side.
5. A feedwater heating system according to claim 1, wherein the superheater (2) is a surface heater, and the heat of heating of the superheater (2) is from electric current, gas or coal.
6. A feedwater heating system according to claim 1 wherein the steam source (1) is on-line steam or local start-up steam.
7. A feedwater heating system according to claim 6 wherein, when the temperature of the on-line steam supply or the on-line steam start-up cannot meet the temperature requirement of the steam source heated by the heater (4), the superheater (2) is used for heating to meet the requirement.
8. A feedwater heating system according to claim 1, further comprising a heater inlet feedwater conduit (6) and a heater outlet conduit (7); wherein, the outlet of the heater inlet water supply pipeline (6) is connected with the second inlet of the heater (4), and the second outlet of the heater (4) is connected with the inlet of the heater outlet pipeline (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220103783.6U CN216521613U (en) | 2022-01-14 | 2022-01-14 | Water supply heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220103783.6U CN216521613U (en) | 2022-01-14 | 2022-01-14 | Water supply heating system |
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| Publication Number | Publication Date |
|---|---|
| CN216521613U true CN216521613U (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220103783.6U Active CN216521613U (en) | 2022-01-14 | 2022-01-14 | Water supply heating system |
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| CN (1) | CN216521613U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484413A (en) * | 2022-01-14 | 2022-05-13 | 西安热工研究院有限公司 | System and method for heating water |
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2022
- 2022-01-14 CN CN202220103783.6U patent/CN216521613U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484413A (en) * | 2022-01-14 | 2022-05-13 | 西安热工研究院有限公司 | System and method for heating water |
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