CN216522519U - Device for utilizing waste heat of direct air cooling unit - Google Patents
Device for utilizing waste heat of direct air cooling unit Download PDFInfo
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- CN216522519U CN216522519U CN202122766140.8U CN202122766140U CN216522519U CN 216522519 U CN216522519 U CN 216522519U CN 202122766140 U CN202122766140 U CN 202122766140U CN 216522519 U CN216522519 U CN 216522519U
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Abstract
The utility model discloses a device for utilizing waste heat of a direct air cooling unit, which comprises a steam turbine unit, an air cooling island, a power circulation unit and a refrigeration unit, wherein partial exhaust steam of the air cooling unit is utilized to drive power circulation and refrigeration circulation, so that effective cascade utilization of the exhaust steam waste heat of a steam turbine is realized, the external power supply quantity of a system is increased, and the whole energy utilization efficiency of the system is improved.
Description
Technical Field
The utility model belongs to the technical field of low-temperature waste heat utilization, and relates to a device for utilizing waste heat of a direct air cooling unit.
Background
Among the low-temperature waste heat utilization technologies, the Organic Rankine Cycle (ORC) technology is favored because of its advantages such as simple structure, high stability, high power generation efficiency, and low sealing requirements. The ORC system adopts low-boiling point organic matters such as halogenated hydrocarbon or hydrocarbon and the like as Rankine cycle of working media, can effectively utilize various low-grade heat energy, and has wide application prospect in the field of low-temperature waste heat utilization.
In some regions, because of the relative scarcity of water resources, the coal-fired unit usually adopts an air cooling mode to cool the exhausted steam or the circulating water of the unit. Because the cooling system is in closed circulation, the water consumption is almost zero, and the consumption of water resources in the coal-fired power plant is greatly reduced. But simultaneously, the problem of higher unit design and operation backpressure is brought, and the unit exhaust steam and heat loss are huge, and the operation efficiency of the unit is influenced. Especially under the operation condition in summer, the operation backpressure of the direct air cooling unit can even reach 35-40 kPa. The back pressure is high, so that the operation efficiency of the unit is reduced, and the safe operation of the unit is hidden.
Disclosure of Invention
The utility model aims to solve the problems in the prior art and provides the method.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
the device for utilizing the waste heat of the direct air cooling unit comprises a steam turbine unit, a condensing water tank, a first evaporator, a turbine, a heat exchange unit, a condenser, a second evaporator and an absorber;
the exhaust steam of the steam turbine unit is divided into two paths, one path of exhaust steam enters the condensing unit for cooling and condensing and then enters the condensing water tank, the other path of exhaust steam enters the first evaporator for heat exchange with the working medium, the steam after heat exchange enters the heat exchange unit for heat exchange again, the generated condensed water enters the second evaporator for cooling and then enters the condensing water tank, the hot steam generated by heat absorption of the working medium enters the turbine for work, and the working medium exhaust steam generated by the turbine enters the heat exchange unit for heat exchange and then enters the condenser for condensing;
the condensation working medium generated in the condenser is divided into two paths, one path returns to the first evaporator, the other path enters the second evaporator for heat exchange, the generated working medium steam enters the absorber, and the solution in the absorber absorbs the working medium steam and then enters the heat exchange unit for heat exchange;
the solution after heat exchange in the heat exchange unit returns to the absorber, and the working medium steam separated out by heat exchange enters the condenser.
The utility model is further improved in that:
the heat exchange unit comprises a generator and a solution heat exchanger;
steam of the first evaporator enters a generator for heat exchange, and generated condensate water enters a second evaporator;
working medium exhaust steam generated by the turbine sequentially enters the generator and the solution heat exchanger for heat exchange and then enters the condenser;
and the solution in the absorber sequentially enters the solution heat exchanger and the generator for heat exchange, the solution after heat exchange returns to the absorber through the solution heat exchanger, and the working medium steam separated out by the solution heat exchange enters the condenser.
And a working medium pump is arranged between the condensing working medium outlet of the condenser and the working medium inlet of the first evaporator.
And a first throttle valve is arranged between the condensed working medium outlet of the condenser and the condensed working medium inlet of the second generator.
And a compressor is arranged between the working medium steam outlet of the second generator and the working medium steam inlet of the absorber.
And a solution pump is arranged between the solution outlet of the absorber and the solution inlet of the solution heat exchanger.
And a second throttle valve is arranged between the solution outlet of the solution heat exchanger and the solution inlet of the absorber.
The condensing unit comprises an air cooling island, a steam inlet of the air cooling island is connected with a steam outlet of the steam turbine set, and a condensed water outlet of the air cooling island is connected with an inlet of the condensed water tank.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model discloses a device for utilizing waste heat of a direct air cooling unit, which comprises a steam turbine unit, a condensing unit, a condensation water tank, a first evaporator, a heat exchange unit, a condenser, a second evaporator, an absorber and a turbine, wherein the condensing unit is arranged in the steam turbine unit; the exhaust steam of the steam turbine unit is divided into two paths, one path of the exhaust steam enters the condensing unit to be cooled and condensed to generate condensed water and enters the condensing water tank, the other path of the exhaust steam enters the first evaporator to exchange heat with the working medium, the steam after heat exchange enters the heat exchange unit to exchange heat again, the generated condensed water enters the second evaporator to be continuously cooled and then enters the condensing water tank, the working medium absorbs heat in the first evaporator to generate hot steam and enters the turbine to do work, and the working medium exhaust steam generated by the turbine enters the heat exchange unit; working medium steam at the outlet of the heat exchange unit enters a condenser for condensation, condensed working medium generated in the condenser is divided into two paths, and one path of condensed working medium returns to the first evaporator to complete power circulation. The other path of condensed working medium generated in the condenser enters a second evaporator, condensed water generated by the second evaporator enters a condensed water tank, generated working medium steam enters an absorber, a solution in the absorber absorbs the working medium steam and then enters a heat exchange unit for heat exchange, the solution after the heat exchange returns to the absorber, the working medium steam separated out by the solution heat exchange enters the condenser to realize refrigeration cycle, the device utilizes the waste heat of the steam turbine exhaust to drive a composite cycle system, the effective cascade utilization of the waste heat of the steam turbine exhaust is realized, the whole energy utilization efficiency of the device is improved, the steam turbine exhaust drives power cycle, the external power supply of the device is increased, and the power supply capacity of the device is improved; meanwhile, the amount of steam entering the condensing unit is reduced, so that the heat load of the condensing unit is reduced, the heat exchange effect of the condensing unit can be improved, and the backpressure of the air cooling unit is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: the system comprises a steam turbine unit 1, an air cooling island 2, a condensation water tank 3, a first evaporator 4, a turbine 5, a generator 6, a solution heat exchanger 7, a condenser 8, a working medium pump 9, a first throttling valve 10, a second evaporator 11, a compressor 12, an absorber 13, a solution pump 14 and a second throttling valve 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience and simplicity, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the embodiment of the utility model discloses a device for utilizing waste heat of a direct air cooling unit, which comprises a steam turbine unit 1, a condensing unit, a condensation water tank 3, a first evaporator 4, a heat exchange unit, a condenser 8, a second evaporator 11 and an absorber 13; the exhaust steam of the steam turbine unit 1 is divided into two paths, one path of the exhaust steam enters a condensing unit for cooling and condensing to generate condensed water and enters a condensing water tank 3, the other path of the exhaust steam enters a first evaporator 4 for heat exchange with a working medium, the steam after heat exchange enters a heat exchange unit for heat exchange again, the generated high-temperature water enters a second evaporator 11 for further cooling, the hot steam generated by heat absorption of the working medium enters a turbine 5 for work, and the working medium exhaust steam generated by the turbine 5 enters a heat exchange unit; working medium steam at the outlet of the heat exchange unit enters the condenser 8 for condensation, a condensation working medium generated in the condenser 8 is divided into two paths, one path of the condensation working medium returns to the first evaporator 4, the other path of the condensation working medium enters the second evaporator 11 and exchanges heat with high-temperature water in the second evaporator 11, the high-temperature water is changed into low-temperature water and enters the condensation water tank 3, the working medium absorbs the working medium steam generated by the heat of the high-temperature water and enters the absorber 13, the solution in the absorber 13 absorbs the working medium steam and then enters the heat exchange unit for heat exchange, the solution after heat exchange returns to the absorber 13, and the working medium steam separated out by heat exchange enters the condenser 8.
The heat exchange unit comprises a generator 6 and a solution heat exchanger 7; the steam at the outlet of the first evaporator 4 enters the generator 6 for heat exchange, and the generated high-temperature water enters the second evaporator 11 for further cooling; working medium exhaust steam generated by the turbine 5 enters the generator 6 for heat exchange, the working medium after heat exchange enters the solution heat exchanger 7 for heat exchange again for cooling, the solution in the absorber 13 sequentially enters the solution heat exchanger 7 and the generator 6 for heat exchange, the solution after heat exchange returns to the solution heat exchanger 7 for heat release, the solution after heat release returns to the absorber 13, working medium steam separated out by heat exchange enters the condenser 8, a working medium pump 9 is arranged between a condensation working medium outlet of the condenser 8 and a working medium inlet of the evaporator, and a first throttle valve 10 is arranged between the condensation working medium outlet of the condenser 8 and a condensation working medium inlet of the second generator 11. A compressor 12 is arranged between the working medium steam outlet of the second generator 11 and the working medium steam inlet of the absorber 13. A solution pump 14 is arranged between the solution outlet of the absorber 13 and the solution inlet of the solution heat exchanger 7. A second throttle valve 15 is arranged between the solution outlet of the solution heat exchanger 7 and the solution inlet of the absorber 13. The condensing unit comprises an air cooling island 2, a steam inlet of the air cooling island 2 is connected with a steam outlet of the steam turbine unit 1, and a condensed water outlet of the air cooling island 2 is connected with an inlet of a condensed water tank 3.
The utility model also discloses a cascade utilization method of waste heat of the direct air cooling unit, which comprises the following steps:
the steam turbine set 1 is provided with two steam outlets, one steam outlet is connected with a steam inlet of the air cooling island 2, the other steam outlet is connected with an inlet of the first evaporator 4, the steam discharged into the air cooling island 2 is cooled by ambient air and then condensed into the condensed water tank 3, the steam discharged into the first evaporator 4 exchanges heat with organic working media in the first evaporator 4 to be primarily cooled, then the steam enters the generator 6 to be cooled again to become high-temperature water, and finally the steam enters the evaporator 11 to be cooled to become low-temperature water and returns to the condensed water tank 3.
In the device disclosed by the utility model, a power circulation unit is composed of a first evaporator 4, a turbine 5, a generator 6, a solution heat exchanger 7, a condenser 8 and a working medium pump 9, and the working method of the power circulation unit comprises the following steps:
the organic working medium absorbs the heat of the steam exhausted by the steam turbine set 1 in the first evaporator 4 to become superheated steam, then the superheated steam enters the turbine 5 to expand and do work to drive the generator to generate electricity, the working medium exhaust steam of the turbine 5 sequentially enters the generator 6 and the solution heat exchanger 7 to release heat, then the solution exhaust steam enters the condenser 8 to be condensed, and part of the working medium at the outlet of the condenser 8 is boosted by the working medium pump 9 and then returns to the first evaporator 4 to complete the power unit circulation.
In the device disclosed by the utility model, a generator 6, a solution heat exchanger 7, a condenser 8, a first throttle valve 10, an evaporator 11, a compressor 12, an absorber 13, a solution pump 14 and a second throttle valve 15 form a refrigeration unit, and the working method of the refrigeration unit comprises the following steps:
the dilute solution at the outlet of the absorber 13 enters the solution heat exchanger 7 after being boosted by the solution pump 14, exchanges heat with the concentrated solution returned from the generator 6, enters the generator 6, and absorbs the waste heat of the steam discharged by the turbine 5 and the waste heat of the steam discharged by the steam turbine unit 1 to separate out the organic working medium to be converted into the concentrated solution. The concentrated solution enters the solution heat exchanger 7 to release heat, is throttled by the second throttling valve 15 and then returns to the absorber 13, and organic working medium steam separated out from the solution enters the condenser 8 to release heat and condense. And then enters the evaporator 11 to absorb heat and become working medium steam again after being throttled by the first throttle valve 10, and returns to the absorber 13 after being pressurized by the compressor 12 to be absorbed by dilute solution, thereby completing the circulation of the refrigeration unit.
The power cycle and the refrigeration cycle adopt the same organic working medium.
The organic working medium can be R1234ze or R1234 yf;
the absorbent solution may be selected from ionic liquids [ HMIM ] [ Tf2N ].
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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 (8)
1. The device for utilizing the waste heat of the direct air cooling unit is characterized by comprising a steam turbine unit (1), a condensing unit, a condensation water tank (3), a first evaporator (4), a turbine (5), a heat exchange unit, a condenser (8), a second evaporator (11) and an absorber (13);
the exhaust steam of the steam turbine unit (1) is divided into two paths, one path of exhaust steam enters a condensing unit for cooling and condensing and then enters a condensing water tank (3), the other path of exhaust steam enters a first evaporator (4) for heat exchange with a working medium, the steam after heat exchange enters a heat exchange unit for heat exchange again, the generated condensed water enters a second evaporator (11) for cooling and then enters the condensing water tank (3), the hot steam generated by heat absorption of the working medium enters a turbine (5) for acting, and the working medium exhaust steam generated by the turbine (5) enters a heat exchange unit for heat exchange and then enters a condenser (8) for condensing;
the condensation working medium generated in the condenser (8) is divided into two paths, one path returns to the first evaporator (4), the other path enters the second evaporator (11) for heat exchange, the generated working medium steam enters the absorber (13), and the solution in the absorber (13) enters the heat exchange unit for heat exchange after absorbing the working medium steam;
the solution after heat exchange in the heat exchange unit returns to the absorber (13), and the working medium steam separated out by heat exchange enters the condenser (8).
2. The device for utilizing the residual heat of the direct air cooling unit according to the claim 1, characterized in that the heat exchange unit comprises a generator (6) and a solution heat exchanger (7);
steam of the first evaporator (4) enters the generator (6) for heat exchange, and generated condensed water enters the second evaporator (11);
working medium exhaust steam generated by the turbine (5) sequentially enters the generator (6) and the solution heat exchanger (7) for heat exchange and then enters the condenser (8);
the solution in the absorber (13) sequentially enters the solution heat exchanger (7) and the generator (6) for heat exchange, the solution after heat exchange returns to the absorber (13) through the solution heat exchanger (7), and the working medium steam separated out by the solution heat exchange enters the condenser (8).
3. The device for utilizing the waste heat of the direct air cooling unit as claimed in claim 2, wherein a working medium pump (9) is arranged between the condensed working medium outlet of the condenser (8) and the working medium inlet of the first evaporator (4).
4. The device for utilizing the waste heat of the direct air cooling unit as set forth in claim 2, characterized in that a first throttle valve (10) is arranged between the condensed working medium outlet of the condenser (8) and the condensed working medium inlet of the second evaporator (11).
5. The device for utilizing the waste heat of the direct air cooling unit as claimed in claim 2, characterized in that a compressor (12) is arranged between the working medium steam outlet of the second evaporator (11) and the working medium steam inlet of the absorber (13).
6. The device for utilizing the residual heat of the direct air cooling unit according to the claim 5, characterized in that a solution pump (14) is arranged between the solution outlet of the absorber (13) and the solution inlet of the solution heat exchanger (7).
7. The device for utilizing the waste heat of the direct air cooling unit according to the claim 6, characterized in that a second throttle valve (15) is arranged between the solution outlet of the solution heat exchanger (7) and the solution inlet of the absorber (13).
8. The device for utilizing the waste heat of the direct air cooling unit as claimed in any one of claims 1-7, wherein the condensing unit comprises an air cooling island (2), a steam inlet of the air cooling island (2) is connected with a steam outlet of the steam turbine unit (1), and a condensed water outlet of the air cooling island (2) is connected with an inlet of the condensed water tank (3).
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| CN202122766140.8U CN216522519U (en) | 2021-11-11 | 2021-11-11 | Device for utilizing waste heat of direct air cooling unit |
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| CN202122766140.8U CN216522519U (en) | 2021-11-11 | 2021-11-11 | Device for utilizing waste heat of direct air cooling unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883762A (en) * | 2021-11-11 | 2022-01-04 | 西安热工研究院有限公司 | Direct air cooling unit waste heat cascade utilization system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883762A (en) * | 2021-11-11 | 2022-01-04 | 西安热工研究院有限公司 | Direct air cooling unit waste heat cascade utilization system and method |
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