CN215598142U - System for improving vacuum pumping efficiency of thermal power plant - Google Patents
System for improving vacuum pumping efficiency of thermal power plant Download PDFInfo
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- CN215598142U CN215598142U CN202122124227.5U CN202122124227U CN215598142U CN 215598142 U CN215598142 U CN 215598142U CN 202122124227 U CN202122124227 U CN 202122124227U CN 215598142 U CN215598142 U CN 215598142U
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Abstract
The utility model relates to a system for improving the vacuum pumping efficiency of a thermal power plant, which belongs to the technical field of thermal power generation and comprises a steam turbine; one end of the condenser is connected with the steam turbine; an air extractor; the inlet of the air extraction cooler is connected with the condenser, and the outlet of the air extraction cooler is connected with the condenser and the air extractor; the heat exchanger is used for carrying out heat exchange and cooling on the mixed gas extracted by the condenser, condensing part of water vapor into condensate, then sending the condensate into the condenser to participate in thermodynamic cycle, and sending the cooled mixed gas into the air extractor. The utility model utilizes the air extraction cooler to directly or indirectly carry out the temperature reduction treatment on the mixed gas and the cooling water, part of water vapor is condensed into water, the temperature and the flow of the mixed gas entering the air extractor are reduced, and the purposes of improving the vacuum-pumping efficiency, recycling the working medium and saving water and energy are achieved.
Description
Technical Field
The utility model relates to the technical field of thermal power generation, in particular to a system for improving the vacuum pumping efficiency of a thermal power plant.
Background
According to the working principle of a steam turbine, the vacuum degree of a condenser in a thermal power plant has great influence on the efficiency and the power of a steam turbine device. The condenser plays a role of a cold source, the main task is to condense the steam turbine exhaust into water, and the air extractor plays a role of establishing vacuum and extracting air leaked from an unclosed part of a vacuum system and uncondensed steam in operation so as to maintain the vacuum degree of the condenser.
The working characteristics of the air extractor and the working pressure and the working temperature of the condenser are mutually influenced and restricted. The vacuum degree of the condenser is low, the working temperature is high, the content of water vapor carried by unit dry air is high, and the air extractor needs to extract more mixed gas to maintain the vacuum degree of the condenser. Taking an 18MW straight condensing unit as an example, the exhaust pressure is 7kPa, the working temperature of the condenser is 39 ℃, the supercooling degree of a gas exhaust area of the condenser is 4 ℃ in consideration of the design (the temperature of the mixed gas is 35 ℃ and corresponds to the saturated steam pressure of 5.946 kPa), and the moisture content of the mixed gas is 2.595kg/kg (dry air), so that 2.595kg of water vapor is carried in each 1kg of dry air. When the amount of the air to be pumped out is 25kg/h for maintaining the vacuum degree of the condenser, about 64.875kg/h of uncondensed water vapor is simultaneously pumped out by the air pumping equipment. The steam which is not condensed enters the air extractor to cause the temperature rise of working fluid, so that the output of the air extractor is reduced, the working pressure and temperature of the condenser are restricted, and the efficiency of a turbonator unit is influenced.
The steam consumption rate of the 18MW straight condensing unit with the steam inlet parameter of 3.9MPa and the temperature of 390 ℃ is about 0.05 kg/kW.h higher when the steam exhaust pressure is 8kPa than when the pressure is 7kPa under the same condition. Therefore, in order to ensure the efficiency of the unit, the closed water jet air ejector system needs to continuously supplement low-temperature water to reduce the temperature of the working fluid, the water ring vacuum pump needs to set cooling water as the working fluid for cooling, and the water ring vacuum pump needs to consume 16-20t/h of water by taking the output of 25kg (dry air)/h as an example; closed water jet ejector systems require about 25-35 t/h. Meanwhile, the vacuum degree of the condenser is low, and the loss of working media of thermodynamic cycle is increased.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a system for improving the vacuum pumping efficiency of a thermal power plant, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the utility model provides the following technical scheme:
a system for increasing the vacuum pumping efficiency of a thermal power plant, comprising:
a steam turbine;
one end of the condenser is connected with the steam turbine;
an air extractor;
the inlet of the air extraction cooler is connected with the condenser, and the outlet of the air extraction cooler is connected with the condenser and the air extractor; the heat exchanger is used for carrying out heat exchange and cooling on the mixed gas extracted by the condenser, condensing part of water vapor into condensate, then sending the condensate into the condenser to participate in thermodynamic cycle, and sending the cooled mixed gas into the air extractor.
As a further technical scheme of the utility model, the condenser is connected with the steam turbine through a steam exhaust connecting pipe, the inlet of the air extraction cooler is connected with the condenser through an air extraction pipe, and the outlet of the air extraction cooler is connected with the condenser through an air condensation pipe.
As a further technical scheme of the utility model, a steam trap, a power valve or a water seal is arranged on the air condensation water pipe.
As a further technical scheme of the utility model, a chemical supplementing water pipe is arranged in the exhaust cooler, one end of the chemical supplementing water pipe is connected with the cooling water inlet pipe, and the other end of the chemical supplementing water pipe is connected with the cooling water outlet pipe.
As a further technical solution of the present invention, the extraction cooler is an indirect heat exchanger or a hybrid heat exchanger.
As a further technical scheme of the utility model, the condenser is a water-cooling condenser or a direct air-cooling condenser.
As a further technical scheme of the utility model, the air extractor is a water ring vacuum pump or a water jet air extractor.
Compared with the prior art, the utility model has the beneficial effects that: the system utilizes the air exhaust cooler to directly or indirectly carry out the temperature reduction treatment on the mixed gas and the cooling water, part of water vapor is condensed into water, the temperature and the flow of the mixed gas entering the air extractor are reduced, and the purposes of improving the vacuum-pumping efficiency, recycling the working medium and saving water and energy are achieved.
Drawings
Fig. 1 is a schematic diagram of a system for improving the vacuum efficiency of a thermal power plant.
In the figure: 1-a steam turbine; 2-a condenser; 3-an air extraction cooler; 4-an air extractor; 5-steam exhaust connecting pipe; 6-air exhaust pipe; 7-chemical supplementary water pipe; 8-air condensation water pipe.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment of the present invention is realized in such a way that, as shown in fig. 1, the system for improving the vacuum pumping efficiency of the thermal power plant comprises:
a steam turbine 1;
one end of the condenser 2 is connected with the steam turbine 1;
an air extractor 4;
an inlet of the air extraction cooler 3 is connected with the condenser 2, and an outlet of the air extraction cooler 3 is connected with the condenser 2 and the air extractor 4; the heat exchanger is used for exchanging heat and cooling the mixed gas extracted by the condenser 2, condensing part of water vapor into condensate, then sending the condensate into the condenser 2 to participate in thermodynamic cycle, and sending the cooled mixed gas into the air extractor 4.
In practical application of the embodiment, the mixed gas pumped out by the condenser 2 is firstly fed into the gas pumping cooler 3 for heat exchange and temperature reduction, the moisture content of the cooled humid air is reduced according to the physical properties of the humid air, part of water vapor is condensed into condensate and then enters the condenser 2 to participate in thermodynamic cycle, and the cooled mixed gas enters the gas ejector 4; the temperature and the flow of the cooled mixer are reduced, the working efficiency of the air extractor 4 is improved, the vacuum degree of the condenser 2 is maintained, and the efficiency of a turbo generator set is ensured; meanwhile, the temperature rise phenomenon of the working fluid of the air extractor 4 is relieved, the consumption of cooling water is reduced, and the purpose of saving water is achieved.
As shown in fig. 1, as a preferred embodiment of the present invention, the condenser 2 is connected to the steam turbine 1 through a steam discharge pipe 5, an inlet of the extraction cooler 3 is connected to the condenser 2 through an extraction air pipe 6, and an outlet of the extraction cooler 3 is connected to the condenser 2 through an air condensate pipe 8.
In the one aspect of this embodiment, it is stable to guarantee being connected of condenser 2 and steam turbine 1 through setting up exhaust takeover 5, guarantees through setting up air extraction pipe 6 and air condensate pipe 8 that the connection of air extraction cooler 3 and condenser 2 is stable, and the dismouting is maintained all more conveniently, crouches once, controls for convenient comdenstion water, install steam trap, power valve or water seal on the air condensate pipe 8.
As shown in fig. 1, as another preferred embodiment of the present invention, a chemical supplementary water pipe 7 is installed in the extraction cooler 3, and one end of the chemical supplementary water pipe 7 is connected to the cooling water inlet pipe, and the other end is connected to the cooling water outlet pipe.
In the one kind condition of this embodiment, carry out the thermal treatment to air exhaust cooler 3 through setting up chemistry moisturizing water pipe 7 to air exhaust cooler 3, for improving the treatment effect, chemistry moisturizing water pipe 7 can the heliciform setting in air exhaust cooler 3, and leading-in cold water through the cooling inlet tube, the heat of cooling inlet tube is absorbed to cold water to discharge the heat along with the cooling water from cooling outlet pipe, realize stably dispelling the heat.
Preferably, in order to ensure the efficient operation of the system, the air exhaust cooler 3 is an indirect heat exchanger or a hybrid heat exchanger, the condenser 2 is a water-cooling condenser 2 or a direct air-cooling condenser 2, and the air ejector 4 is a water ring vacuum pump or a water jet air ejector 4.
The working principle is as follows: in order to establish and maintain the vacuum degree of the condenser 2, the air extractor 4 needs to extract mixed gas of air and uncondensed steam leaked from an unclosed part of a vacuum system from the condenser 2, and heat in the mixed gas causes the temperature of working fluid of the air extractor 4 to be increased, so that the output of the air extractor 4 and the vacuum degree of the condenser 2 are influenced, and the efficiency of a turbo generator set is influenced; in order to improve the vacuum-pumping efficiency and recover the working medium, the system utilizes the air-extracting cooler 3 to directly or indirectly carry out the temperature reduction treatment on the mixed gas by using the mixed gas and the cooling water, part of water vapor is condensed into water, the temperature and the flow of the mixed gas entering the air extractor 4 are reduced, and the purposes of improving the vacuum-pumping efficiency, recovering the working medium and saving water and energy are achieved.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A system for increasing the vacuum pumping efficiency of a thermal power plant, comprising:
a steam turbine;
one end of the condenser is connected with the steam turbine;
an air extractor;
the inlet of the air extraction cooler is connected with the condenser, and the outlet of the air extraction cooler is connected with the condenser and the air extractor; the heat exchanger is used for carrying out heat exchange and cooling on the mixed gas extracted by the condenser, condensing part of water vapor into condensate, then sending the condensate into the condenser to participate in thermodynamic cycle, and sending the cooled mixed gas into the air extractor.
2. The system for improving the vacuum pumping efficiency of a thermal power plant according to claim 1, wherein the condenser is connected with the steam turbine through a steam exhaust connecting pipe, the inlet of the extraction cooler is connected with the condenser through an extraction air pipe, and the outlet of the extraction cooler is connected with the condenser through an air condensation pipe.
3. The system for improving the vacuum pumping efficiency of a thermal power plant of claim 2, wherein the air condensate pipe is provided with a steam trap, a power valve or a water seal.
4. The system for improving the vacuum pumping efficiency of a thermal power plant as claimed in claim 2, wherein a chemical supplementing water pipe is installed in the pumping cooler, one end of the chemical supplementing water pipe is connected with the cooling water inlet pipe, and the other end of the chemical supplementing water pipe is connected with the cooling water outlet pipe.
5. The system for improving the vacuum efficiency of a thermal power plant of claim 1, wherein the extraction air cooler is an indirect heat exchanger or a hybrid heat exchanger.
6. The system for improving the vacuum pumping efficiency of a thermal power plant according to claim 1, wherein the condenser is a water-cooled condenser or a direct air-cooled condenser.
7. The system for improving the vacuum pumping efficiency of a thermal power plant of claim 1, wherein the air extractor is a water ring vacuum pump or a water jet air extractor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122124227.5U CN215598142U (en) | 2021-09-04 | 2021-09-04 | System for improving vacuum pumping efficiency of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122124227.5U CN215598142U (en) | 2021-09-04 | 2021-09-04 | System for improving vacuum pumping efficiency of thermal power plant |
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| CN215598142U true CN215598142U (en) | 2022-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324672A (en) * | 2022-09-20 | 2022-11-11 | 北京华晟智擎新能源有限公司 | Low-grade waste heat ORC power generation system with online exhaust device |
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2021
- 2021-09-04 CN CN202122124227.5U patent/CN215598142U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324672A (en) * | 2022-09-20 | 2022-11-11 | 北京华晟智擎新能源有限公司 | Low-grade waste heat ORC power generation system with online exhaust device |
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