CN214330712U - Supercritical steam turbine with high-flow and high-parameter heat supply steam extraction - Google Patents
Supercritical steam turbine with high-flow and high-parameter heat supply steam extraction Download PDFInfo
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Abstract
The utility model relates to the technical field of steam turbines, in particular to a supercritical steam turbine with large flow and high parameter heat supply steam extraction, which aims to solve the problems that the steam parameters of the heat supply steam extraction steam turbine which is put into operation in the world are low when the steam extraction flow is large or the steam extraction flow is small when the steam extraction parameter is high, the inlet end of a high-pressure steam gas circuit, the inlet end of a medium-pressure steam gas circuit and the inlet end of a heat supply gas circuit are connected in parallel with the outlet end of a boiler, one end of the outlet end of the high-pressure steam gas circuit is connected with the inlet end of the boiler, the other end of the outlet end of the high-pressure steam gas circuit is connected with the inlet end of the boiler through a heating gas circuit, one end of the outlet end of the medium-pressure steam gas circuit is connected with the inlet end of a low-pressure steam gas circuit, the other end of the outlet end of the medium-pressure steam gas circuit is connected with the boiler through a heating gas circuit, the outlet end of the low-pressure steam gas circuit is connected with the boiler through a heating gas circuit, the steam pressure and the steam flow can be freely extracted from the reheating thermal section.
Description
Technical Field
The utility model relates to a steam turbine technical field, concretely relates to possess supercritical steam turbine of large-traffic high parameter heat supply extraction of vapour.
Background
At present, the heat supply extraction steam turbine put into operation in the world generally has the problems that when the extraction flow is large, the steam parameter is low, or when the extraction parameter is high, the extraction flow is small, and no steam turbine has the capacity of extracting both high steam parameter and large steam flow. This is primarily due to the great difficulty in developing a steam turbine with such capability in terms of structural design and system control. According to the development requirements of the current electric power market, a steam turbine which can extract a large steam flow in a reheating hot section of the steam turbine and does not influence the efficiency and the safe operation of a unit is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a purpose: the utility model discloses a solve the heat supply extraction steam turbine of commissioning in the present world when external heat supply extraction steam its steam parameter is on the low side when the ubiquitous extraction steam flow is big, perhaps the extraction steam parameter then the extraction steam flow is on the small side when higher problem provides a supercritical steam turbine who possesses large-traffic high parameter heat supply extraction steam.
The purpose of the utility model is realized like this: a supercritical steam turbine with high flow and high parameter heat supply steam extraction comprises a boiler, a high-pressure steam gas path, a medium-pressure steam gas path, a low-pressure steam gas path, a heat supply gas path and a heating gas path;
the inlet end of high-pressure steam gas circuit, the inlet end of medium-pressure steam gas circuit and the inlet end of heat supply gas circuit and the outlet end parallel connection of boiler, the one end of the outlet end of high-pressure steam gas circuit is connected with the inlet end of boiler, the other end of the outlet end of high-pressure steam gas circuit and the inlet end of boiler are connected through the heating gas circuit, the one end of the outlet end of medium-pressure steam gas circuit and the inlet end of low-pressure steam gas circuit are connected, the other end of the outlet end of medium-pressure steam gas circuit is connected with the boiler through the heating gas circuit, the outlet end of low-pressure steam gas circuit is connected with the boiler through the heating gas circuit.
Further, the high-pressure steam gas circuit comprises a high-pressure cylinder and a high-pressure valve;
the inlet end of the high-pressure cylinder is connected with the outlet end of the boiler through a gas circuit, the high-pressure valve is arranged on the gas circuit, one end of the outlet end of the high-pressure cylinder is connected with the inlet end of the boiler through a gas circuit II, and the other end of the outlet end of the high-pressure cylinder is connected with the heating gas circuit through a gas circuit III.
Furthermore, the medium-pressure steam gas circuit comprises a first medium-pressure cylinder, a first medium-pressure valve, a second medium-pressure cylinder and a second medium-pressure valve;
the inlet end of the first intermediate pressure cylinder is connected with the outlet end of the boiler through a fourth gas path, a first intermediate pressure valve is arranged on the fourth gas path, one end of the outlet end of the first intermediate pressure cylinder is connected with the inlet end of the low-pressure steam gas path through a fifth gas path, a communicating pipe isolation valve is arranged on the fifth gas path, the other end of the outlet end of the first intermediate pressure cylinder is connected with the inlet end of the heating gas path through a sixth gas path, and a steam exhaust isolation valve is arranged on the sixth gas path;
the inlet end of No. two intermediate pressure cylinders is connected with the outlet end of the boiler through No. seven gas circuits, No. two intermediate pressure valves are arranged on No. seven gas circuits, one end of the outlet end of No. two intermediate pressure cylinders is connected with the inlet end of the low-pressure steam gas circuit through No. eight gas circuits, and the other end of the outlet end of No. two intermediate pressure cylinders is connected with the inlet end of the heating gas circuit through No. eight gas circuits.
Further, the heat supply gas circuit comprises a steam extraction flow control valve and a heat user;
the inlet end of the hot user is connected with the outlet end of the boiler through a No. nine gas circuit, and the steam extraction flow control valve is arranged on the No. nine gas circuit.
Still further, the low-pressure steam gas circuit comprises a low-pressure cylinder;
the entry end of low pressure jar is connected through the exit end of No. five gas circuits with intermediate pressure jar, and the entry end of low pressure jar is connected through the exit end of No. eight gas circuits with No. two intermediate pressure jars, and the exit end of low pressure jar is connected through the entry end of No. ten gas circuits with the heating gas circuit.
Further, the heating gas circuit comprises a low-pressure heater, a deaerator, a water feeding pump and a high-pressure heating device;
no. six gas circuits, No. eight gas circuits, No. ten gas circuits all are connected with low pressure feed water heater's entry end, and low pressure feed water heater's exit end is connected with the entry end of oxygen-eliminating device, and the exit end of oxygen-eliminating device is connected with the entry end of water-feeding pump, and the exit end of water-feeding pump is connected with high-pressure heating equipment's entry end, high-pressure heating equipment's entry end still is connected with No. three gas circuits, and high-pressure heating equipment's exit end is connected with the entry end of boiler through No. eleven gas circuits.
And furthermore, the outlet end of the second intermediate pressure cylinder is connected with a deaerator through a twelfth air passage.
Furthermore, the outlet end of the high-pressure heating equipment is also provided with a thirteen gas path, and the outlet end of the thirteen gas path is communicated with a tenth gas path.
Furthermore, the outlet end of the low-pressure heater is also provided with a fourteen-gas path, and the outlet end of the fourteen-gas path is communicated with a thirteen-gas path.
Has the advantages that: the power distribution of the two intermediate pressure cylinders is determined according to the steam extraction amount of the reheating thermal section, and the pressure of the reheating thermal section or the steam extraction pressure is adjusted through an intermediate pressure valve. In a specified extraction steam flow range, the pressure of a reheating hot section is adjusted only by adjusting a valve of the first intermediate pressure cylinder, the opening degree of the intermediate pressure valve is small at the moment, the cylinder is only ensured to have enough cooling steam flow, and finally the exhaust steam of the intermediate pressure cylinder with lower pressure is introduced into a low-pressure heater. And the valve of the second intermediate pressure cylinder does not participate in the regulation at this moment, and the second intermediate pressure cylinder is ensured to have all the designed flow to pass through, so that the efficiency of the second intermediate pressure cylinder is not influenced, and the through-flow size of the first intermediate pressure cylinder is only about half of the full capacity, so that the valve configured by the intermediate pressure cylinder is small in size, small in through-flow area behind the valve, good in valve flow characteristic, and easy to adjust and control the steam pressure in front of the valve.
The extraction type supercritical steam turbine is provided with a high pressure cylinder, two intermediate pressure cylinders and one or two low pressure cylinders, and the cylinders are coaxially arranged. The two intermediate pressure cylinders adopt the same steam inlet parameters and are reheating hot section steam, the steam inlet amount of each cylinder is controlled by respective valves, the steam pressure and the steam flow required by the reheating hot section of the unit can be freely extracted, and meanwhile, the steam pressure of the reheating hot section can be ensured not to be greatly changed through the adjustment of the intermediate pressure valve of the steam turbine, and the efficiency of the intermediate pressure cylinders and the safe operation of the steam turbine are not influenced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a diagram of a thermodynamic system of a steam turbine according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to 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 "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be given by way of example only with reference to the accompanying drawings, and the embodiments are not limited thereto.
The first embodiment is as follows: a supercritical steam turbine with high flow and high parameter heat supply steam extraction comprises a boiler 1, a high-pressure steam gas path, a medium-pressure steam gas path, a low-pressure steam gas path, a heat supply gas path and a heating gas path;
the inlet end of high pressure steam gas circuit, the inlet end of middling pressure steam gas circuit and the inlet end of heat supply gas circuit and boiler 1's exit end parallel connection, the one end of the exit end of high pressure steam gas circuit is connected with boiler 1's entry end, the other end of the exit end of high pressure steam gas circuit and boiler 1's entry end are connected through the heating gas circuit, the one end of the exit end of middling pressure steam gas circuit is connected with the entry end of low pressure steam gas circuit, the other end of the exit end of middling pressure steam gas circuit is connected with boiler 1 through the heating gas circuit, the exit end of low pressure steam gas circuit is connected with boiler 1 through the heating gas circuit.
The second embodiment is as follows: the high-pressure steam gas circuit comprises a high-pressure cylinder 2 and a high-pressure valve 3;
the inlet end of the high-pressure cylinder 2 is connected with the outlet end of the boiler 1 through a gas path, the high-pressure valve 3 is arranged on the gas path, one end of the outlet end of the high-pressure cylinder 2 is connected with the inlet end of the boiler 1 through a gas path II, and the other end of the outlet end of the high-pressure cylinder 2 is connected with the heating gas path through a gas path III.
Other embodiments are the same as the first embodiment.
The third concrete implementation mode: the medium-pressure steam gas circuit comprises a first medium-pressure cylinder 4, a first medium-pressure valve 5, a second medium-pressure cylinder 7 and a second medium-pressure valve 8;
the inlet end of the first intermediate pressure cylinder 4 is connected with the outlet end of the boiler 1 through a fourth gas path, a first intermediate pressure valve 5 is arranged on the fourth gas path, one end of the outlet end of the first intermediate pressure cylinder 4 is connected with the inlet end of a low-pressure steam gas path through a fifth gas path, a communicating pipe isolation valve 6 is arranged on the fifth gas path, the other end of the outlet end of the first intermediate pressure cylinder 4 is connected with the inlet end of a heating gas path through a sixth gas path, and a steam exhaust isolation valve 13 is arranged on the sixth gas path;
the inlet end of No. two intermediate pressure cylinder 7 is connected with the outlet end of boiler 1 through No. seven gas circuits, No. two intermediate pressure valves 8 are arranged on No. seven gas circuits, one end of the outlet end of No. two intermediate pressure cylinder 7 is connected with the inlet end of low-pressure steam gas circuit through No. eight gas circuits, and the other end of the outlet end of No. two intermediate pressure cylinder 7 is connected with the inlet end of heating gas circuit through No. eight gas circuits.
Other embodiments are the same as the second embodiment.
The fourth concrete implementation mode: the heat supply gas circuit comprises a steam extraction flow control valve 10 and a heat user 11;
the inlet end of the heat consumer 11 is connected with the outlet end of the boiler 1 through a No. nine gas path, and the steam extraction flow control valve 10 is arranged on the No. nine gas path.
Other embodiments are the same as the third embodiment.
The fifth concrete implementation mode: the low-pressure steam gas path comprises a low-pressure cylinder 9;
the inlet end of the low-pressure cylinder 9 is connected with the outlet end of the first intermediate-pressure cylinder 4 through a fifth air passage, the inlet end of the low-pressure cylinder 9 is connected with the outlet end of the second intermediate-pressure cylinder 7 through an eighth air passage, and the outlet end of the low-pressure cylinder 9 is connected with the inlet end of the heating air passage through a tenth air passage.
The other embodiments are the same as the fourth embodiment.
The sixth specific implementation mode: the heating gas circuit comprises a low-pressure heater 15, a deaerator 14, a water feeding pump 12 and a high-pressure heating device 16;
no. six gas circuits, No. eight gas circuits, No. ten gas circuits all are connected with low pressure feed water heater 15's entry end, and low pressure feed water heater 15's exit end is connected with deaerator 14's entry end, and deaerator 14's exit end is connected with feed pump 12's entry end, and feed pump 12's exit end is connected with high-pressure heating equipment 16's entry end, high-pressure heating equipment 16's entry end still is connected with No. three gas circuits, and high-pressure heating equipment 16's exit end is connected with boiler 1's entry end through No. eleven gas circuits.
The other embodiments are the same as the fifth embodiment.
The seventh embodiment: the outlet end of the second intermediate pressure cylinder 7 is connected with the deaerator 14 through a twelfth air path.
The other embodiments are the same as the sixth embodiment.
The specific implementation mode is eight: and the outlet end of the high-pressure heating equipment 16 is also provided with a thirteen gas path, and the outlet end of the thirteen gas path is communicated with a tenth gas path.
The other embodiments are the same as the seventh embodiment.
The specific implementation method nine: and a fourteen gas path is also arranged at the outlet end of the low-pressure heater 15, and the outlet end of the fourteen gas path is communicated with a thirteen gas path.
The other embodiments are the same as the eighth embodiment.
The working principle is as follows:
high-temperature and high-pressure steam discharged from the boiler 1 enters the high-pressure cylinder 2 after being adjusted by the high-pressure valve 3, the steam returns to the boiler for reheating after passing through the high-pressure cylinder 2, and the reheated steam enters the reheating hot section pipeline 17 from the boiler 1. The reheated steam can be fed into the first intermediate pressure cylinder 4 through the intermediate pressure valve 5 or into the second intermediate pressure cylinder 7 through the intermediate pressure valve 8. Steam discharged by the first intermediate pressure cylinder 4 and the second intermediate pressure cylinder 7 enters the low pressure cylinder 9 through the communicating pipe 18, is condensed into water after doing work in the low pressure cylinder 9, and the condensed water flows through the low pressure heater 15, the deaerator 14, the water feed pump 12 and the high pressure heater 16 in sequence after being properly boosted, and finally returns to the boiler for secondary circulation.
The steam in the reheating hot section pipeline 17 can also go to the hot user 11 after being adjusted by the steam extraction flow control valve 10, so that the reheating hot section steam extraction is realized.
During the steam cycle, the high pressure valve 3 controls the power variation of the turbine and the steam flow in the reheat hot leg line 17. When the load of the steam turbine changes or the amount of steam required by the heat consumer 11 changes, the steam pressure in the reheat hot leg pipe 17 changes. However, this pressure change does not meet the requirement of the heat consumer 11, so the steam pressure in the reheat hot leg pipe 17 needs to be adjusted by the first intermediate pressure valve 5 and the second intermediate pressure valve 8 to meet the requirement of the heat consumer 11.
In the steam pressure adjusting process, the valve position of the second intermediate pressure valve 8 is kept unchanged, and only the opening degree of the first intermediate pressure valve 5 is changed. If the steam pressure in the reheating hot section pipeline 17 needs to be increased, the first medium pressure valve 5 needs to be closed, and if the steam pressure in the reheating hot section pipeline 17 needs to be reduced, the first medium pressure valve 5 needs to be opened.
When the first intermediate pressure valve 5 is closed to the minimum opening degree, a certain flow of reheat steam enters the first intermediate pressure cylinder 4, so that the through flow of the first intermediate pressure cylinder 4 is cooled. At this time, the flow of the first intermediate pressure cylinder 4 is too small, so that the exhaust steam pressure is too low, and the exhaust steam cannot be normally discharged into the communicating pipe 18 and then enters the low pressure cylinder 9. The isolation valve 6 of the communicating pipe needs to be closed, the steam exhaust isolation valve 13 of the first intermediate pressure cylinder is opened, the exhaust steam of the first intermediate pressure cylinder 4 enters the low-pressure heater 15, is condensed into water after heat exchange, and finally is converged into the condensed water of the low-pressure cylinder 9.
When the steam pressure in the reheating hot section pipeline 17 changes greatly, the opening degree of the second intermediate pressure valve 8 needs to be changed to adjust the reheating steam pressure, and the valve does not need to participate in other situations.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A supercritical steam turbine with high flow and high parameter heat supply extraction is characterized in that: the system comprises a boiler (1), a high-pressure steam gas path, a medium-pressure steam gas path, a low-pressure steam gas path, a heat supply gas path and a heating gas path;
the inlet end of high pressure steam gas circuit, the inlet end of middling pressure steam gas circuit and the entry end of heat supply gas circuit and the exit end parallel connection of boiler (1), the one end of the exit end of high pressure steam gas circuit is connected with the entry end of boiler (1), the other end of the exit end of high pressure steam gas circuit is connected through the heating gas circuit with the entry end of boiler (1), the one end of the exit end of middling pressure steam gas circuit is connected with the entry end of low pressure steam gas circuit, the other end of the exit end of middling pressure steam gas circuit is connected with boiler (1) through the heating gas circuit, the exit end of low pressure steam gas circuit is connected with boiler (1) through the heating gas circuit.
2. The supercritical steam turbine with high flow and high parameter heat extraction according to claim 1 is characterized by: the high-pressure steam gas path comprises a high-pressure cylinder (2) and a high-pressure valve (3);
the inlet end of the high-pressure cylinder (2) is connected with the outlet end of the boiler (1) through a gas circuit, the high-pressure valve (3) is arranged on the gas circuit, one end of the outlet end of the high-pressure cylinder (2) is connected with the inlet end of the boiler (1) through a gas circuit II, and the other end of the outlet end of the high-pressure cylinder (2) is connected with the heating gas circuit through a gas circuit III.
3. The supercritical steam turbine with high flow and high parameter heat extraction according to claim 2 is characterized by: the medium-pressure steam gas circuit comprises a first medium-pressure cylinder (4), a first medium-pressure valve (5), a second medium-pressure cylinder (7) and a second medium-pressure valve (8);
the inlet end of the first intermediate pressure cylinder (4) is connected with the outlet end of the boiler (1) through a fourth gas path, a first intermediate pressure valve (5) is arranged on the fourth gas path, one end of the outlet end of the first intermediate pressure cylinder (4) is connected with the inlet end of the low-pressure steam gas path through a fifth gas path, a communicating pipe isolation valve (6) is arranged on the fifth gas path, the other end of the outlet end of the first intermediate pressure cylinder (4) is connected with the inlet end of the heating gas path through a sixth gas path, and a steam exhaust isolation valve (13) is arranged on the sixth gas path;
the inlet end of the second intermediate pressure cylinder (7) is connected with the outlet end of the boiler (1) through a seventh gas path, the second intermediate pressure valve (8) is arranged on the seventh gas path, one end of the outlet end of the second intermediate pressure cylinder (7) is connected with the inlet end of the low-pressure steam gas path through an eighth gas path, and the other end of the outlet end of the second intermediate pressure cylinder (7) is connected with the inlet end of the heating gas path through an eighth gas path.
4. The supercritical steam turbine with high flow and high parameter heat extraction according to claim 3 is characterized by: the heat supply gas circuit comprises a steam extraction flow control valve (10) and a heat user (11);
the inlet end of the heat consumer (11) is connected with the outlet end of the boiler (1) through a No. nine gas path, and the steam extraction flow control valve (10) is arranged on the No. nine gas path.
5. The supercritical steam turbine with high flow and high parameter heat extraction according to claim 4 is characterized by: the low-pressure steam gas circuit comprises a low-pressure cylinder (9);
the inlet end of the low-pressure cylinder (9) is connected with the outlet end of the first intermediate-pressure cylinder (4) through a fifth air passage, the inlet end of the low-pressure cylinder (9) is connected with the outlet end of the second intermediate-pressure cylinder (7) through an eighth air passage, and the outlet end of the low-pressure cylinder (9) is connected with the inlet end of the heating air passage through a tenth air passage.
6. The supercritical steam turbine with high flow and high parameter heat extraction according to claim 5 is characterized by: the heating gas circuit comprises a low-pressure heater (15), a deaerator (14), a water feeding pump (12) and high-pressure heating equipment (16);
no. six gas circuits, No. eight gas circuits, No. ten gas circuits all are connected with the entry end of low pressure feed water heater (15), and the exit end of low pressure feed water heater (15) is connected with the entry end of oxygen-eliminating device (14), and the exit end of oxygen-eliminating device (14) is connected with the entry end of feed water pump (12), and the exit end of feed water pump (12) is connected with the entry end of high pressure heating equipment (16), the entry end of high pressure heating equipment (16) still is connected with No. three gas circuits, and the exit end of high pressure heating equipment (16) is connected with the entry end of boiler (1) through No. eleven gas circuits.
7. The supercritical steam turbine with high flow and high parameter heat extraction according to claim 6 is characterized by: the outlet end of the second intermediate pressure cylinder (7) is connected with the deaerator (14) through a twelfth air passage.
8. The supercritical steam turbine with high flow and high parameter heat extraction according to claim 7 is characterized by: and the outlet end of the high-pressure heating equipment (16) is also provided with a thirteen gas path, and the outlet end of the thirteen gas path is communicated with a tenth gas path.
9. The supercritical steam turbine with high flow and high parameter heat extraction according to claim 8, wherein: and the outlet end of the low-pressure heater (15) is also provided with a fourteen-gas path, and the outlet end of the fourteen-gas path is communicated with a thirteen-gas path.
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| CN112780372A (en) * | 2021-03-10 | 2021-05-11 | 哈尔滨汽轮机厂有限责任公司 | Supercritical steam turbine with high-flow and high-parameter heat supply steam extraction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112780372A (en) * | 2021-03-10 | 2021-05-11 | 哈尔滨汽轮机厂有限责任公司 | Supercritical steam turbine with high-flow and high-parameter heat supply steam extraction |
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