CN212671881U - External condensate cooling system of exhaust steam recovery heat supply supercritical unit - Google Patents
External condensate cooling system of exhaust steam recovery heat supply supercritical unit Download PDFInfo
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- CN212671881U CN212671881U CN202020955649.XU CN202020955649U CN212671881U CN 212671881 U CN212671881 U CN 212671881U CN 202020955649 U CN202020955649 U CN 202020955649U CN 212671881 U CN212671881 U CN 212671881U
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Abstract
An external condensate water cooling system of an exhaust steam recovery heat supply supercritical unit comprises an indirect air cooling unit condenser, a circulating water system and an exhaust steam heat supply system; the circulating water system is connected to a condenser of the indirect air cooling unit; condensed water of the exhaust steam heat supply system is connected to an external heat exchanger through a pipeline to be cooled and then is connected to a condenser of the indirect air cooling unit; the exhaust steam heat supply system comprises a steam booster condenser; condensed water in a hot well at the bottom of the steam booster condenser is input into the external heat exchanger through a first pipeline; the temperature of the condensed water is reduced, and then the condensed water is sent to condensed water fine treatment equipment for chemical fine treatment, so that the requirements of boiler water supply and steam quality standards are fundamentally ensured, and the long-term safe and stable operation of the supercritical indirect air cooling unit is ensured.
Description
Technical Field
The utility model belongs to the energy-conserving field of power plant, concretely relates to water condensing system of supercritical unit.
Background
In the prior art, a steam booster is used for recovering the waste heat of the exhaust steam of the thermal power plant for supplying heat, and the energy-saving effect is obvious, so that the steam booster is more and more widely popularized and applied. A steam turbine based thermal power plant exhaust steam waste heat heating system is characterized in that a three-level heating system is generally adopted for heating network water, a first level is a pre-condenser, a second level is a steam turbine condenser, and a third level is a heating network heater. For example, the inlet steam pressure of the first-stage pre-condenser is 20kpa.a, the corresponding saturation temperature is about 60 ℃, and the temperature of the condensate is about 59 ℃. The steam inlet pressure of the condenser of the second-stage steam booster is 51KPa.a, the corresponding saturation temperature is about 81.8 ℃, and the temperature of the condensate is about 81 ℃.
At present, along with the gradual improvement of parameters of a turbo generator unit, a 350MW supercritical heat supply unit is mostly adopted by a planned cogeneration heating unit. However, for a 350MW supercritical heat supply unit, because the boiler does not continuously discharge sewage, the quality of boiler feed water has great influence on the safe and stable operation of the unit. In the design rule of the thermal power plant, the condensed water treatment of the supercritical unit is specified, and the condensed water entering the boiler of the supercritical unit is required to be completely and finely treated so as to meet the requirements of the quality standards of the boiler water supply and steam. For a condensed water recovery system of a supercritical unit, condensed water needs to be subjected to fine treatment and then enters a boiler. The water temperature of the 81 ℃ condensed water from the steam booster condenser is too high, so that the condensed water is not allowed to directly enter the fine treatment device. If directly enter the fine processing device, the service life of the fine processing resin can be influenced.
At present, two main schemes exist, the first scheme is a fine treatment mode after temperature reduction: the high-temperature condensed water is cooled to below a certain temperature and then enters a condensed water fine treatment system for filtration mixed bed treatment, and the treated drain water is delivered to a condensed water system, so that the water quality of the unit is guaranteed. However, the scheme has the disadvantages of complex system structure, more equipment increase and complex operation and adjustment. The second scheme is used for transforming a condensate fine treatment system, and the resin is replaced by high-temperature resistant resin. But the equipment cost is higher, and high temperature resistant resin must be changed regularly, and the operation maintenance cost is also very high.
At present, a new water condensing system scheme is needed, the temperature of the condensed water of the turbine condenser is reduced to a temperature range suitable for the fine treatment of the condensed water, the modification cost and the operation cost are reduced, and the optimal technology and economy, safety and reliability are achieved.
SUMMERY OF THE UTILITY MODEL
Because the precision treatment device for the condensed water of the supercritical unit sets a high limit for the temperature of the condensed water. An object of the utility model is to provide a steam exhaust retrieves condensation system of heat supply supercritical unit and operation method thereof can enough retrieve the steam exhaust heat completely, reduce the cold junction heat loss, and system architecture satisfies the condensate return water temperature requirement again, saves investment, operates reliably.
In order to realize the purpose, the technical scheme of the utility model is that:
an external condensate water cooling system of an exhaust steam recovery heat supply supercritical unit comprises an indirect air cooling unit condenser, a circulating water system and an exhaust steam heat supply system; the circulating water system is connected to a condenser of the indirect air cooling unit; the method is characterized in that condensed water of the exhaust steam heat supply system is connected to an external heat exchanger through a pipeline for cooling and then is connected to a condenser of an indirect air cooling unit; the exhaust steam heat supply system comprises a steam booster condenser; and condensed water in a hot well at the bottom of the steam booster condenser is input into the external heat exchanger through a first pipeline.
Furthermore, the exhaust steam heat supply system also comprises a preposed condenser, and a heat supply network water return pipe is subjected to two-stage heating and temperature rise through the preposed condenser and the steam booster condenser and then is output through a heat supply network water outlet pipe; and the condensed water in the hot well at the bottom of the pre-condenser is input into the external heat exchanger through a second pipeline.
Furthermore, the water outlet of the condenser of the steam booster is also connected to a hot well at the bottom of the pre-condenser through a third pipeline; the water outlet of the preposed condenser is also connected to the condenser of the indirect air cooling unit through a fourth pipeline.
Furthermore, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with switching valves.
Furthermore, the external heat exchanger is connected with a circulating water pipe and a heat supply network water pipe.
Furthermore, switching valves are installed on the circulating water pipe and the heat supply network water pipe, and circulating water or heat supply network backwater is switched and connected to serve as a refrigerant of the external heat exchanger.
Furthermore, a condensate pump is installed on a water inlet pipeline of the external heat exchanger, and condensate is conveyed into the external heat exchanger in a pressurized mode.
Furthermore, the steam condenser of the steam booster adopts a water vapor heat exchanger, and the shell side of the steam condenser is connected with a steam exhaust outlet of the steam booster; the working steam inlet of the steam booster is connected with the steam exhaust of a certain middle section of the steam turbine, and the suction inlet is connected with the exhaust steam of the steam turbine.
Furthermore, the preposed condenser adopts a water vapor heat exchanger, and the shell side of the preposed condenser is connected with exhaust steam of a steam turbine or exhaust steam of a low-pressure cylinder.
Furthermore, the circulating water pipe is connected to a bypass or a branch of a circulating water path of the condenser of the indirect air cooling unit; the heat supply network water pipe is connected to a bypass or a branch of the heat supply network water return path. Due to the adoption of the technical scheme, the utility model discloses the technological progress who gains as follows.
The utility model discloses need not to increase extra equipment, the structure is comparatively simple, on the basis that satisfies boiler feed water and steam quality standard requirement, has reduced manufacturing cost, has improved the heating capacity. The utility model discloses a variable workspace of indirect air cooling unit condenser, the circulating water cooling who adopts the air cooling unit condenser comes the high temperature condensate water of exhaust steam heating system, reaches and send into condensate water fine treatment equipment again after the permission temperature and carry out chemical fine treatment, carries to the oxygen-eliminating device at last, and fundamentally has guaranteed the requirement of boiler feedwater and steam quality standard, guarantees the long-term safe and stable operation of unit. On the other hand, the heat supply capacity of the heat supply network heat exchanger is further improved by adopting the steam booster to absorb the exhaust steam for heat supply.
Drawings
FIG. 1 is a schematic view of a condensate system configuration;
wherein, 1 indirect air cooling unit condenser, 2 preposition condenser, 3 turbo condenser, 4 turbo, 5 heat supply network return water pipe, 6 heat supply network outlet pipe, 7 circulating water pipe, 8 external heat exchanger, 9 turbo condenser outlet water bypass, 10 preposition condenser outlet water bypass, 11 indirect air cooling unit condenser outlet pipe, 12 circulating water branch pipe, 13 heat supply network water pipe.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it is to be understood that the description herein is only for purposes of illustration and explanation and is not intended to limit the invention.
As shown in figure 1, the 2X350MW indirect air cooling unit is applied to waste steam recovery heating. The system comprises an indirect air cooling unit condenser 1, a circulating water system (not shown), a condensed water backwater system (not shown), a steam booster condenser 3, a pre-condenser 2 and a steam booster 4. The indirect air cooling unit condenser 1 is introduced into a circulating water pipeline 7, the turbine exhaust steam entering the air cooling unit condenser 1 is cooled and condensed by utilizing external circulating water, and condensed water enters a hot well at the bottom of the air cooling unit condenser 1 and enters a condensed water return system through a condensed water outlet pipeline 11 arranged at the hot well. The condensate return system comprises condensate fine treatment equipment, a condensate return heating system, a deaerator and condensate which enters the condensate fine treatment equipment at a proper temperature, and the condensate is subjected to desalination treatment, so that the quality of water is guaranteed to meet the requirement of the boiler on the quality of feed water. And after the fine treatment, the condensed water returns to the boiler again for heating circulation after passing through a condensed water backwater heating system and a deaerator.
The prepositive condenser 2 and the steam increasing condenser 3 form an exhaust steam heating system. And a heat supply network water return pipe 5 connected with a heat supply network carries out two-stage heating and temperature rise through the pre-condenser 2 and the steam booster condenser 3 and then enters the heat supply network again through a heat supply network water outlet pipe 6. The preposed condenser 2 adopts a water vapor heat exchanger, the shell side of the preposed condenser is connected with the steam exhaust of a steam turbine or steam extraction of a certain middle section, the steam inlet pressure of the preposed condenser is 20KPa.a, the corresponding saturation temperature is about 60 ℃, and the temperature of condensed water is about 59 ℃. The steam booster condenser 3 adopts a water vapor heat exchanger, and the shell side of the water vapor heat exchanger is connected with a steam exhaust outlet of the steam booster 4. The working steam inlet of the steam increasing machine 4 is connected with the steam exhaust of a certain middle section of the steam turbine, the suction inlet is connected with the exhaust steam of the steam turbine, the steam inlet pressure of the steam increasing machine condenser is 51KPa.a, the corresponding saturation temperature is about 81.8 ℃, and the temperature of the condensed water is about 81 ℃.
The condensed water in the hot well at the bottom of the steam booster condenser 3 is connected to the hot well at the bottom of the pre-condenser 2 through a pipeline; the condensed water in the hot well at the bottom of the pre-condenser 2 is connected to the external heat exchanger 8 through a pipeline; the water outlet of the condenser 3 of the steam booster is also connected to a pipeline entering the external heat exchanger 8 through a water outlet bypass 9, and a valve is arranged on the water outlet bypass 9.
The outlet water of the external heat exchanger 8 is connected to the condenser 1 of the indirect air cooling unit through a pipeline; the water outlet of the pre-condenser 2 is also connected to the condenser 1 of the indirect air cooling unit through a water outlet bypass 10, and a valve is arranged on the water outlet bypass 10.
The heat exchange tube of the external heat exchanger 8 is connected with a circulating water branch tube 12 and a heat supply network water tube 13, a switching valve is arranged on the pipeline, and circulating water or heat supply network return water can be switched to be connected as a refrigerant of the external heat exchanger 8. According to different system requirements, the circulating water branch pipe 12 can be connected to a circulating water channel of a condenser of the indirect air cooling unit in a bypass or branch mode; the heat supply network water pipe 13 can be connected to a heat supply network water return path in a bypass or branch way.
A condensate pump is arranged on a water inlet pipeline of the external heat exchanger 8, and condensate is conveyed into the external heat exchanger 8 by pressurization.
The system is operated in the way that,
(a) when the system is operated in a non-heat supply season, the heat supply and heat supply network is stopped, and the pre-condenser 2, the steam turbine condenser 3 and the external heat exchanger 8 are stopped. The condenser of the indirect air cooling unit utilizes the circulating water to cool the introduced steam turbine exhaust to form condensed water.
(b) And in the first heat supply season, when the temperatures of the condensed water of the exhaust steam condenser and the condenser of the steam booster are lower than the temperature required by the condensed water fine treatment device, the external heat exchanger 8 is stopped, and the condensed water from the pre-condenser 2 and the condenser of the steam booster 3 is directly introduced into the condenser of the indirect air cooling unit.
(c) And in the second heating season operation mode, when the temperatures of the condensed water of the exhaust steam condenser and the condenser of the steam booster are higher than the temperature required by the condensed water fine treatment device, the external heat exchanger 8 is operated, and the condensed water from the pre-condenser 2 and the condenser of the steam booster 3 is cooled by the external heat exchanger 8 and then is introduced into the condenser of the indirect air cooling unit.
(d) And a third heating season operation mode, wherein when the temperature of the condensed water of the exhaust steam condenser is lower than the temperature required by the condensed water fine treatment device, the water outlet bypass 9 of the steam booster condenser and the water outlet bypass 10 of the pre-condenser are opened, other condensed water pipelines are closed, the external heat exchanger 8 is operated, the condensed water from the steam booster condenser 3 is cooled by the external heat exchanger 8 and then is introduced into the condenser of the indirect air cooling unit, and the condensed water from the pre-condenser 2 is directly introduced into the condenser of the indirect air cooling unit.
Finally, it should be noted that: the above description is only for the purpose of explanation and not intended to limit the present invention, and although the present invention has been described in detail, it will be apparent to those skilled in the art that the foregoing descriptions can be modified, or equivalents may be substituted for some of the technical features thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An external condensate water cooling system of an exhaust steam recovery heat supply supercritical unit comprises an indirect air cooling unit condenser, a circulating water system and an exhaust steam heat supply system; the circulating water system is connected to a condenser of the indirect air cooling unit; the method is characterized in that condensed water of the exhaust steam heat supply system is connected to an external heat exchanger through a pipeline for cooling and then is connected to a condenser of an indirect air cooling unit; the exhaust steam heat supply system comprises a steam booster condenser; and condensed water in a hot well at the bottom of the steam booster condenser is input into the external heat exchanger through a first pipeline.
2. The external condensate cooling system of the exhaust steam recovery heat supply supercritical unit according to claim 1, characterized in that the exhaust steam heat supply system further comprises a pre-condenser, and a heat supply network water return pipe is subjected to two-stage heating temperature rise through the pre-condenser and a steam booster condenser and then is output through a heat supply network water outlet pipe; and the condensed water in the hot well at the bottom of the pre-condenser is input into the external heat exchanger through a second pipeline.
3. The external condensate cooling system of the dead steam recovery heat supply supercritical unit as claimed in claim 2, wherein the water outlet of the condenser of the steam booster is further connected to a bottom hot well of the pre-condenser through a third pipeline; the water outlet of the preposed condenser is also connected to the condenser of the indirect air cooling unit through a fourth pipeline.
4. The external condensate cooling system of the dead steam recovery heat supply supercritical unit as claimed in claim 3, wherein the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with switching valves.
5. The external condensate cooling system of the dead steam recovery heating supercritical unit as claimed in claim 1, wherein the external heat exchanger is connected with a circulating water pipe and a heat supply network water pipe.
6. The external condensate cooling system of the dead steam recovery heat supply supercritical unit as claimed in claim 5, wherein switching valves are installed on the circulating water pipe and the heat supply network water pipe, and the circulating water or the heat supply network backwater is switched and connected as a refrigerant of the external heat exchanger.
7. The external condensate cooling system of the dead steam recovery heat supply supercritical unit as claimed in claim 1, wherein a condensate pump is installed on a water inlet pipeline of the external heat exchanger, and condensate is conveyed into the external heat exchanger under pressure.
8. The external condensate cooling system of the dead steam recovery heat supply supercritical unit as claimed in claim 1, wherein the steam condenser of the steam booster adopts a water vapor heat exchanger, and the shell side of the steam booster is connected with a steam exhaust outlet of the steam booster; the working steam inlet of the steam booster is connected with the steam exhaust of a certain middle section of the steam turbine, and the suction inlet is connected with the exhaust steam of the steam turbine.
9. The external condensate cooling system of the dead steam recovery heat supply supercritical unit as claimed in claim 2, wherein the pre-condenser adopts a water vapor heat exchanger, and the shell side of the pre-condenser is connected with the dead steam of the steam turbine or the low-pressure cylinder exhaust steam.
10. The external condensate cooling system of the dead steam recovery heat supply supercritical unit as claimed in claim 5, wherein the circulating water pipe is connected to a bypass or a branch of a circulating water path of a condenser of the indirect air cooling unit; the heat supply network water pipe is connected to a bypass or a branch of the heat supply network water return path.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020955649.XU CN212671881U (en) | 2020-05-31 | 2020-05-31 | External condensate cooling system of exhaust steam recovery heat supply supercritical unit |
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| CN202020955649.XU CN212671881U (en) | 2020-05-31 | 2020-05-31 | External condensate cooling system of exhaust steam recovery heat supply supercritical unit |
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